initial commit

2022-04-06 14:11:44 +02:00
commit 400c751961
31 changed files with 103392 additions and 0 deletions
--- a/board/fab/fab.zip
+++ b/board/fab/fab.zip
--- a/board/fab/mobus-B_Cu.gbl
+++ b/board/fab/mobus-B_Cu.gbl
--- a/board/fab/mobus-B_Mask.gbs
+++ b/board/fab/mobus-B_Mask.gbs
@@ -0,0 +1,120 @@
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--- a/board/fab/mobus-B_Paste.gbp
+++ b/board/fab/mobus-B_Paste.gbp
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--- a/board/fab/mobus-B_SilkS.gbo
+++ b/board/fab/mobus-B_SilkS.gbo
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--- a/board/fab/mobus-Edge_Cuts.gm1
+++ b/board/fab/mobus-Edge_Cuts.gm1
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--- a/board/fab/mobus-F_Cu.gtl
+++ b/board/fab/mobus-F_Cu.gtl
--- a/board/fab/mobus-F_Mask.gts
+++ b/board/fab/mobus-F_Mask.gts
--- a/board/fab/mobus-F_Paste.gtp
+++ b/board/fab/mobus-F_Paste.gtp
--- a/board/fab/mobus-F_SilkS.gto
+++ b/board/fab/mobus-F_SilkS.gto
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+++ b/board/fab/mobus-NPTH.drl
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--- a/board/fab/mobus-PTH.drl
+++ b/board/fab/mobus-PTH.drl
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--- a/board/fp-info-cache
+++ b/board/fp-info-cache
--- a/board/modbus_slave-cache.lib
+++ b/board/modbus_slave-cache.lib
@@ -0,0 +1,463 @@
+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# Atmel_AVR_wPF_ATMEGA328P-AU
+#
+DEF Atmel_AVR_wPF_ATMEGA328P-AU U 0 40 Y Y 1 F N
+F0 "U" -750 1250 50 H V L BNN
+F1 "Atmel_AVR_wPF_ATMEGA328P-AU" 400 -1400 50 H V L BNN
+F2 "Housings_QFP:TQFP-32_7x7mm_Pitch0.8mm" 0 0 50 H I C CIN
+F3 "" 0 0 50 H I C CNN
+ALIAS ATMEGA48A-AU ATMEGA48PA-AU ATMEGA88A-AU ATMEGA88PA-AU ATMEGA168PA-AU ATMEGA328-AU ATMEGA328P-AU
+$FPLIST
+ TQFP*7x7mm*Pitch0.8mm*
+$ENDFPLIST
+DRAW
+S -750 1200 850 -1300 0 1 10 f
+X (PCINT19/OC2B/INT1)PD3 1 1000 -800 150 L 40 40 1 1 B
+X (PCINT22/OC0A/AIN0)PD6 10 1000 -1100 150 L 40 40 1 1 B
+X (PCINT23/AIN1)PD7 11 1000 -1200 150 L 40 40 1 1 B
+X (PCINT0/CLKO/ICP1)PB0 12 1000 1100 150 L 40 40 1 1 B
+X (PCINT1/OC1A)PB1 13 1000 1000 150 L 40 40 1 1 B
+X (PCINT2/OC1B/~SS~)PB2 14 1000 900 150 L 40 40 1 1 B
+X (PCINT3/OC2A/MOSI)PB3 15 1000 800 150 L 40 40 1 1 B
+X (PCINT4/MISO)PB4 16 1000 700 150 L 40 40 1 1 B
+X (PCINT5/SCK)PB5 17 1000 600 150 L 40 40 1 1 B
+X AVCC 18 -900 600 150 R 40 40 1 1 W
+X ADC6 19 -900 -250 150 R 40 40 1 1 I
+X (PCINT20/XCK/T0)PD4 2 1000 -900 150 L 40 40 1 1 B
+X AREF 20 -900 300 150 R 40 40 1 1 B
+X GND 21 -900 -1000 150 R 40 40 1 1 W
+X ADC7 22 -900 -350 150 R 40 40 1 1 I
+X (PCINT8/ADC0)PC0 23 1000 250 150 L 40 40 1 1 B
+X (PCINT9/ADC1)PC1 24 1000 150 150 L 40 40 1 1 B
+X (PCINT10/ADC2)PC2 25 1000 50 150 L 40 40 1 1 B
+X (PCINT11/ADC3)PC3 26 1000 -50 150 L 40 40 1 1 B
+X (PCINT12/SDA/ADC4)PC4 27 1000 -150 150 L 40 40 1 1 B
+X (PCINT13/SCL/ADC5)PC5 28 1000 -250 150 L 40 40 1 1 B
+X (PCINT14/~RESET~)PC6 29 1000 -350 150 L 40 40 1 1 B
+X GND 3 -900 -1200 150 R 40 40 1 1 W
+X (PCINT16/RXD)PD0 30 1000 -500 150 L 40 40 1 1 B
+X (PCINT17/TXD)PD1 31 1000 -600 150 L 40 40 1 1 B
+X (PCINT18/INT0)PD2 32 1000 -700 150 L 40 40 1 1 B
+X VCC 4 -900 1100 150 R 40 40 1 1 W
+X GND 5 -900 -1100 150 R 40 40 1 1 W
+X VCC 6 -900 900 150 R 40 40 1 1 W
+X (PCINT6/XTAL1/TOSC1)PB6 7 1000 500 150 L 40 40 1 1 B
+X (PCINT7/XTAL2/TOSC2)PB7 8 1000 400 150 L 40 40 1 1 B
+X (PCINT21/OC0B/T1)PD5 9 1000 -1000 150 L 40 40 1 1 B
+ENDDRAW
+ENDDEF
+#
+# Atmel_AVR_wPF_AVR-ISP-6
+#
+DEF Atmel_AVR_wPF_AVR-ISP-6 CON 0 40 Y Y 1 F N
+F0 "CON" 0 400 50 H V L CNN
+F1 "Atmel_AVR_wPF_AVR-ISP-6" 0 -300 50 H V L CNN
+F2 "" -250 50 50 V I C CNN
+F3 "" -1275 -550 50 H I C CNN
+$FPLIST
+ IDC?Header*2x03*
+ Pin?Header*2x03*
+$ENDFPLIST
+DRAW
+S -105 -220 -95 -250 0 1 0 N
+S -105 350 -95 320 0 1 0 N
+S 250 -95 220 -105 0 1 0 N
+S 250 5 220 -5 0 1 0 N
+S 250 105 220 95 0 1 0 N
+S 250 205 220 195 0 1 0 N
+S 250 350 -200 -250 0 1 10 f
+X MISO 1 400 200 150 L 50 50 1 1 P
+X VCC 2 -100 500 150 D 50 50 1 1 P
+X SCK 3 400 0 150 L 50 50 1 1 P
+X MOSI 4 400 100 150 L 50 50 1 1 P
+X RST 5 400 -100 150 L 50 50 1 1 P
+X GND 6 -100 -400 150 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Connector_Conn_01x04_Female
+#
+DEF Connector_Conn_01x04_Female J 0 40 Y N 1 F N
+F0 "J" 0 200 50 H V C CNN
+F1 "Connector_Conn_01x04_Female" 0 -300 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Connector*:*_1x??_*
+$ENDFPLIST
+DRAW
+A 0 -200 20 901 -901 1 1 6 N 0 -180 0 -220
+A 0 -100 20 901 -901 1 1 6 N 0 -80 0 -120
+A 0 0 20 901 -901 1 1 6 N 0 20 0 -20
+A 0 100 20 901 -901 1 1 6 N 0 120 0 80
+P 2 1 1 6 -50 -200 -20 -200 N
+P 2 1 1 6 -50 -100 -20 -100 N
+P 2 1 1 6 -50 0 -20 0 N
+P 2 1 1 6 -50 100 -20 100 N
+X Pin_1 1 -200 100 150 R 50 50 1 1 P
+X Pin_2 2 -200 0 150 R 50 50 1 1 P
+X Pin_3 3 -200 -100 150 R 50 50 1 1 P
+X Pin_4 4 -200 -200 150 R 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Connector_Conn_01x10_Female
+#
+DEF Connector_Conn_01x10_Female J 0 40 Y N 1 F N
+F0 "J" 0 500 50 H V C CNN
+F1 "Connector_Conn_01x10_Female" 0 -600 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Connector*:*_1x??_*
+$ENDFPLIST
+DRAW
+A 0 -500 20 901 -901 1 1 6 N 0 -480 0 -520
+A 0 -400 20 901 -901 1 1 6 N 0 -380 0 -420
+A 0 -300 20 901 -901 1 1 6 N 0 -280 0 -320
+A 0 -200 20 901 -901 1 1 6 N 0 -180 0 -220
+A 0 -100 20 901 -901 1 1 6 N 0 -80 0 -120
+A 0 0 20 901 -901 1 1 6 N 0 20 0 -20
+A 0 100 20 901 -901 1 1 6 N 0 120 0 80
+A 0 200 20 901 -901 1 1 6 N 0 220 0 180
+A 0 300 20 901 -901 1 1 6 N 0 320 0 280
+A 0 400 20 901 -901 1 1 6 N 0 420 0 380
+P 2 1 1 6 -50 -500 -20 -500 N
+P 2 1 1 6 -50 -400 -20 -400 N
+P 2 1 1 6 -50 -300 -20 -300 N
+P 2 1 1 6 -50 -200 -20 -200 N
+P 2 1 1 6 -50 -100 -20 -100 N
+P 2 1 1 6 -50 0 -20 0 N
+P 2 1 1 6 -50 100 -20 100 N
+P 2 1 1 6 -50 200 -20 200 N
+P 2 1 1 6 -50 300 -20 300 N
+P 2 1 1 6 -50 400 -20 400 N
+X Pin_1 1 -200 400 150 R 50 50 1 1 P
+X Pin_10 10 -200 -500 150 R 50 50 1 1 P
+X Pin_2 2 -200 300 150 R 50 50 1 1 P
+X Pin_3 3 -200 200 150 R 50 50 1 1 P
+X Pin_4 4 -200 100 150 R 50 50 1 1 P
+X Pin_5 5 -200 0 150 R 50 50 1 1 P
+X Pin_6 6 -200 -100 150 R 50 50 1 1 P
+X Pin_7 7 -200 -200 150 R 50 50 1 1 P
+X Pin_8 8 -200 -300 150 R 50 50 1 1 P
+X Pin_9 9 -200 -400 150 R 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_C
+#
+DEF Device_C C 0 10 N Y 1 F N
+F0 "C" 25 100 50 H V L CNN
+F1 "Device_C" 25 -100 50 H V L CNN
+F2 "" 38 -150 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ C_*
+$ENDFPLIST
+DRAW
+P 2 0 1 20 -80 -30 80 -30 N
+P 2 0 1 20 -80 30 80 30 N
+X ~ 1 0 150 110 D 50 50 1 1 P
+X ~ 2 0 -150 110 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_CP
+#
+DEF Device_CP C 0 10 N Y 1 F N
+F0 "C" 25 100 50 H V L CNN
+F1 "Device_CP" 25 -100 50 H V L CNN
+F2 "" 38 -150 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ CP_*
+$ENDFPLIST
+DRAW
+S -90 20 90 40 0 1 0 N
+S 90 -20 -90 -40 0 1 0 F
+P 2 0 1 0 -70 90 -30 90 N
+P 2 0 1 0 -50 110 -50 70 N
+X ~ 1 0 150 110 D 50 50 1 1 P
+X ~ 2 0 -150 110 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_C_Small
+#
+DEF Device_C_Small C 0 10 N N 1 F N
+F0 "C" 10 70 50 H V L CNN
+F1 "Device_C_Small" 10 -80 50 H V L CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ C_*
+$ENDFPLIST
+DRAW
+P 2 0 1 13 -60 -20 60 -20 N
+P 2 0 1 12 -60 20 60 20 N
+X ~ 1 0 100 80 D 50 50 1 1 P
+X ~ 2 0 -100 80 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_Crystal
+#
+DEF Device_Crystal Y 0 40 N N 1 F N
+F0 "Y" 0 150 50 H V C CNN
+F1 "Device_Crystal" 0 -150 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Crystal*
+$ENDFPLIST
+DRAW
+S -45 100 45 -100 0 1 12 N
+P 2 0 1 0 -100 0 -75 0 N
+P 2 0 1 20 -75 -50 -75 50 N
+P 2 0 1 20 75 -50 75 50 N
+P 2 0 1 0 100 0 75 0 N
+X 1 1 -150 0 50 R 50 50 1 1 P
+X 2 2 150 0 50 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_Jumper_NC_Dual
+#
+DEF Device_Jumper_NC_Dual JP 0 30 Y N 1 F N
+F0 "JP" 50 -100 50 H V L CNN
+F1 "Device_Jumper_NC_Dual" 0 100 50 H V C BNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ SolderJumper*Bridged*
+ Jumper*
+ TestPoint*2Pads*
+ TestPoint*Bridge*
+$ENDFPLIST
+DRAW
+A -60 10 64 386 1413 0 1 0 N -10 50 -110 50
+A 60 10 64 386 1413 0 1 0 N 110 50 10 50
+C -120 0 35 0 1 0 N
+C 0 0 36 0 1 0 N
+C 120 0 35 0 1 0 N
+X 1 1 -250 0 95 R 50 50 0 1 P
+X 2 2 0 -100 60 U 50 50 0 1 P
+X 3 3 250 0 95 L 50 50 0 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_LED
+#
+DEF Device_LED D 0 40 N N 1 F N
+F0 "D" 0 100 50 H V C CNN
+F1 "Device_LED" 0 -100 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ LED*
+ LED_SMD:*
+ LED_THT:*
+$ENDFPLIST
+DRAW
+P 2 0 1 10 -50 -50 -50 50 N
+P 2 0 1 0 -50 0 50 0 N
+P 4 0 1 10 50 -50 50 50 -50 0 50 -50 N
+P 5 0 1 0 -120 -30 -180 -90 -150 -90 -180 -90 -180 -60 N
+P 5 0 1 0 -70 -30 -130 -90 -100 -90 -130 -90 -130 -60 N
+X K 1 -150 0 100 R 50 50 1 1 P
+X A 2 150 0 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_R_Small
+#
+DEF Device_R_Small R 0 10 N N 1 F N
+F0 "R" 30 20 50 H V L CNN
+F1 "Device_R_Small" 30 -40 50 H V L CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ R_*
+$ENDFPLIST
+DRAW
+S -30 70 30 -70 0 1 8 N
+X ~ 1 0 100 30 D 50 50 1 1 P
+X ~ 2 0 -100 30 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Interface_UART_MAX485E
+#
+DEF Interface_UART_MAX485E U 0 20 Y Y 1 F N
+F0 "U" -240 450 50 H V C CNN
+F1 "Interface_UART_MAX485E" 30 450 50 H V L CNN
+F2 "" 0 -700 50 H I C CNN
+F3 "" 0 50 50 H I C CNN
+ALIAS MAX483E MAX485E MAX487E MAX1487E MAX3485 MAX3483 MAX3486
+$FPLIST
+ DIP*W7.62mm*
+ SOIC*3.9x4.9mm*P1.27mm*
+$ENDFPLIST
+DRAW
+C -12 -145 14 0 1 10 F
+C -1 59 14 0 1 10 F
+C 65 75 14 0 1 10 F
+S -300 400 300 -500 0 1 10 f
+S 50 125 50 125 0 1 0 N
+P 2 0 1 10 -160 -200 -75 -200 N
+P 2 0 1 10 -160 100 -50 100 N
+P 2 0 1 10 -50 -126 -50 -136 N
+P 2 0 1 10 -25 -200 210 -200 N
+P 3 0 1 10 -160 -100 -50 -100 -50 -125 N
+P 3 0 1 10 0 50 0 0 -160 0 N
+P 3 0 1 10 50 125 150 125 150 -200 N
+P 3 0 1 10 100 75 100 -150 0 -150 N
+P 4 0 1 10 -75 -125 -75 -225 25 -175 -75 -125 N
+P 4 0 1 10 -50 100 50 150 50 50 -50 100 N
+P 4 0 1 10 75 75 175 75 175 100 210 100 N
+X RO 1 -400 100 100 R 50 50 1 1 O
+X ~RE 2 -400 0 100 R 50 50 1 1 I
+X DE 3 -400 -100 100 R 50 50 1 1 I
+X DI 4 -400 -200 100 R 50 50 1 1 I
+X GND 5 0 -600 100 U 50 50 1 1 W
+X A 6 400 -200 100 L 50 50 1 1 B
+X B 7 400 100 100 L 50 50 1 1 B
+X VCC 8 0 500 100 D 50 50 1 1 W
+ENDDRAW
+ENDDEF
+#
+# Mechanical_MountingHole
+#
+DEF Mechanical_MountingHole H 0 40 Y Y 1 F N
+F0 "H" 0 200 50 H V C CNN
+F1 "Mechanical_MountingHole" 0 125 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ MountingHole*
+$ENDFPLIST
+DRAW
+C 0 0 50 0 1 50 N
+ENDDRAW
+ENDDEF
+#
+# Regulator_Linear_L7805
+#
+DEF Regulator_Linear_L7805 U 0 10 Y Y 1 F N
+F0 "U" -150 125 50 H V C CNN
+F1 "Regulator_Linear_L7805" 0 125 50 H V L CNN
+F2 "" 25 -150 50 H I L CIN
+F3 "" 0 -50 50 H I C CNN
+ALIAS L7806 L7808 L7885 L7809 L7812 L7815 L7818 L7824
+$FPLIST
+ TO?252*
+ TO?263*
+ TO?220*
+$ENDFPLIST
+DRAW
+S -200 75 200 -200 0 1 10 f
+X IN 1 -300 0 100 R 50 50 1 1 W
+X GND 2 0 -300 100 U 50 50 1 1 W
+X OUT 3 300 0 100 L 50 50 1 1 w
+ENDDRAW
+ENDDEF
+#
+# Transistor_BJT_BC857
+#
+DEF Transistor_BJT_BC857 Q 0 0 Y N 1 F N
+F0 "Q" 200 75 50 H V L CNN
+F1 "Transistor_BJT_BC857" 200 0 50 H V L CNN
+F2 "Package_TO_SOT_SMD:SOT-23" 200 -75 50 H I L CIN
+F3 "" 0 0 50 H I L CNN
+ALIAS BC808 BC856 BC857 BC858 BC859 BC860 MMBT3906
+$FPLIST
+ SOT?23*
+$ENDFPLIST
+DRAW
+C 50 0 111 0 1 10 N
+P 2 0 1 0 25 25 100 100 N
+P 3 0 1 0 25 -25 100 -100 100 -100 N
+P 3 0 1 20 25 75 25 -75 25 -75 N
+P 5 0 1 0 90 -70 70 -90 50 -50 90 -70 90 -70 F
+X B 1 -200 0 225 R 50 50 1 1 I
+X E 2 100 -200 100 U 50 50 1 1 P
+X C 3 100 200 100 D 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# krams_HX711
+#
+DEF krams_HX711 U 0 40 Y Y 1 F N
+F0 "U" -50 450 50 H V C CNN
+F1 "krams_HX711" 50 600 50 H V C CNN
+F2 "" -100 0 50 H I C CNN
+F3 "" -100 0 50 H I C CNN
+DRAW
+S -350 350 300 -550 0 1 0 f
+X VSUP 1 -450 250 100 R 50 50 1 1 I
+X INPB 10 400 -350 100 L 50 50 1 1 I
+X PD_SCK 11 400 -250 100 L 50 50 1 1 I
+X DOUT 12 400 -150 100 L 50 50 1 1 I
+X XO 13 400 -50 100 L 50 50 1 1 I
+X XI 14 400 50 100 L 50 50 1 1 I
+X RATE 15 400 150 100 L 50 50 1 1 I
+X DVDD 16 400 250 100 L 50 50 1 1 I
+X BASE 2 -450 150 100 R 50 50 1 1 I
+X AVDD 3 -450 50 100 R 50 50 1 1 I
+X VFB 4 -450 -50 100 R 50 50 1 1 I
+X AGND 5 -450 -150 100 R 50 50 1 1 I
+X VBG 6 -450 -250 100 R 50 50 1 1 I
+X INNA 7 -450 -350 100 R 50 50 1 1 I
+X INPA 8 -450 -450 100 R 50 50 1 1 I
+X INNB 9 400 -450 100 L 50 50 1 1 I
+ENDDRAW
+ENDDEF
+#
+# power_+24V
+#
+DEF power_+24V #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -150 50 H I C CNN
+F1 "power_+24V" 0 140 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 2 0 1 0 -30 50 0 100 N
+P 2 0 1 0 0 0 0 100 N
+P 2 0 1 0 0 100 30 50 N
+X +24V 1 0 0 0 U 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+# power_+5V
+#
+DEF power_+5V #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -150 50 H I C CNN
+F1 "power_+5V" 0 140 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 2 0 1 0 -30 50 0 100 N
+P 2 0 1 0 0 0 0 100 N
+P 2 0 1 0 0 100 30 50 N
+X +5V 1 0 0 0 U 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+# power_GNDD
+#
+DEF power_GNDD #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -250 50 H I C CNN
+F1 "power_GNDD" 0 -125 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+S -50 -60 50 -80 0 1 10 F
+P 2 0 1 0 0 0 0 -60 N
+X GNDD 1 0 0 0 D 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+#End Library
--- a/board/modbus_slave.csv
+++ b/board/modbus_slave.csv
@@ -0,0 +1,22 @@
+"ID";"Bezeichner";"Gehäuse";"Stückzahl";"Bezeichnung";"Anbieter und Referenz";
+1;"R11,R10,R9";"R_0603_1608Metric";3;"R_Small";;;
+2;"J1";"PhoenixContact_MCV_1,5_10-G-3.81_1x10_P3.81mm_Vertical";1;"Conn_01x10_Female";;;
+3;"JP1";"PinSocket_1x03_P2.54mm_Vertical";1;"Jumper_NC_Dual";;;
+4;"H4,H3,H2,H1";"MountingHole_3.2mm_M3";4;"MountingHole";;;
+5;"C9";"C_2220_5650Metric";1;"10u";;;
+6;"Y1";"Crystal_SMD_HC49-SD";1;"Crystal";;;
+7;"C11,C10";"C_0603_1608Metric";2;"22p";;;
+8;"U4";"SOIC-16W_5.3x10.2mm_P1.27mm";1;"HX711";;;
+9;"U3";"DIP-8_W7.62mm_Socket";1;"MAX485E";;;
+10;"U2";"TO-220-3_Vertical";1;"L7805";;;
+11;"U1";"TQFP-32_7x7mm_P0.8mm";1;"ATMEGA328P-AU";;;
+12;"R8,R7";"R_0603_1608Metric";2;"100R";;;
+13;"R6,R5,R4,R3,R2,R1";"R_0603_1608Metric";6;"170R";;;
+14;"Q1";"SOT-23";1;"BC857";;;
+15;"J4";"PhoenixContact_MCV_1,5_4-G-3.81_1x04_P3.81mm_Vertical";1;"Conn_01x04_Female";;;
+16;"D3,D2,D1";"LED_PLCC-2";3;"LED";;;
+17;"CON1";"IDC-Header_2x03_P2.54mm_Vertical";1;"AVR-ISP-6";;;
+18;"C8,C7";"C_0805_2012Metric";2;"100n";;;
+19;"C6";"C_0603_1608Metric";1;"C_Small";;;
+20;"C5,C4,C3,C1";"C_0603_1608Metric";4;"100n";;;
+21;"C2";"CP_Elec_6.3x9.9";1;"10u";;;
--- a/board/modbus_slave.kicad_pcb
+++ b/board/modbus_slave.kicad_pcb
--- a/board/modbus_slave.kicad_pcb-bak
+++ b/board/modbus_slave.kicad_pcb-bak
--- a/board/modbus_slave.pro
+++ b/board/modbus_slave.pro
@@ -0,0 +1,240 @@
+update=Sa 26 Feb 2022 06:53:53 CET
+version=1
+last_client=kicad
+[general]
+version=1
+RootSch=
+BoardNm=
+[cvpcb]
+version=1
+NetIExt=net
+[eeschema]
+version=1
+LibDir=
+[eeschema/libraries]
+[pcbnew]
+version=1
+PageLayoutDescrFile=
+LastNetListRead=
+CopperLayerCount=2
+BoardThickness=1.6
+AllowMicroVias=0
+AllowBlindVias=0
+RequireCourtyardDefinitions=0
+ProhibitOverlappingCourtyards=1
+MinTrackWidth=0.2
+MinViaDiameter=0.4
+MinViaDrill=0.3
+MinMicroViaDiameter=0.2
+MinMicroViaDrill=0.09999999999999999
+MinHoleToHole=0.25
+TrackWidth1=0.25
+TrackWidth2=0.2
+TrackWidth3=0.4
+ViaDiameter1=0.8
+ViaDrill1=0.4
+dPairWidth1=0.2
+dPairGap1=0.25
+dPairViaGap1=0.25
+SilkLineWidth=0.12
+SilkTextSizeV=1
+SilkTextSizeH=1
+SilkTextSizeThickness=0.15
+SilkTextItalic=0
+SilkTextUpright=1
+CopperLineWidth=0.2
+CopperTextSizeV=1.5
+CopperTextSizeH=1.5
+CopperTextThickness=0.3
+CopperTextItalic=0
+CopperTextUpright=1
+EdgeCutLineWidth=0.05
+CourtyardLineWidth=0.05
+OthersLineWidth=0.15
+OthersTextSizeV=1
+OthersTextSizeH=1
+OthersTextSizeThickness=0.15
+OthersTextItalic=0
+OthersTextUpright=1
+SolderMaskClearance=0
+SolderMaskMinWidth=0
+SolderPasteClearance=0
+SolderPasteRatio=-0
+[pcbnew/Layer.F.Cu]
+Name=F.Cu
+Type=0
+Enabled=1
+[pcbnew/Layer.In1.Cu]
+Name=In1.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In2.Cu]
+Name=In2.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In3.Cu]
+Name=In3.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In4.Cu]
+Name=In4.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In5.Cu]
+Name=In5.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In6.Cu]
+Name=In6.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In7.Cu]
+Name=In7.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In8.Cu]
+Name=In8.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In9.Cu]
+Name=In9.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In10.Cu]
+Name=In10.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In11.Cu]
+Name=In11.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In12.Cu]
+Name=In12.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In13.Cu]
+Name=In13.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In14.Cu]
+Name=In14.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In15.Cu]
+Name=In15.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In16.Cu]
+Name=In16.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In17.Cu]
+Name=In17.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In18.Cu]
+Name=In18.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In19.Cu]
+Name=In19.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In20.Cu]
+Name=In20.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In21.Cu]
+Name=In21.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In22.Cu]
+Name=In22.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In23.Cu]
+Name=In23.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In24.Cu]
+Name=In24.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In25.Cu]
+Name=In25.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In26.Cu]
+Name=In26.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In27.Cu]
+Name=In27.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In28.Cu]
+Name=In28.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In29.Cu]
+Name=In29.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.In30.Cu]
+Name=In30.Cu
+Type=0
+Enabled=0
+[pcbnew/Layer.B.Cu]
+Name=B.Cu
+Type=0
+Enabled=1
+[pcbnew/Layer.B.Adhes]
+Enabled=1
+[pcbnew/Layer.F.Adhes]
+Enabled=1
+[pcbnew/Layer.B.Paste]
+Enabled=1
+[pcbnew/Layer.F.Paste]
+Enabled=1
+[pcbnew/Layer.B.SilkS]
+Enabled=1
+[pcbnew/Layer.F.SilkS]
+Enabled=1
+[pcbnew/Layer.B.Mask]
+Enabled=1
+[pcbnew/Layer.F.Mask]
+Enabled=1
+[pcbnew/Layer.Dwgs.User]
+Enabled=1
+[pcbnew/Layer.Cmts.User]
+Enabled=1
+[pcbnew/Layer.Eco1.User]
+Enabled=1
+[pcbnew/Layer.Eco2.User]
+Enabled=1
+[pcbnew/Layer.Edge.Cuts]
+Enabled=1
+[pcbnew/Layer.Margin]
+Enabled=1
+[pcbnew/Layer.B.CrtYd]
+Enabled=1
+[pcbnew/Layer.F.CrtYd]
+Enabled=1
+[pcbnew/Layer.B.Fab]
+Enabled=1
+[pcbnew/Layer.F.Fab]
+Enabled=1
+[pcbnew/Layer.Rescue]
+Enabled=0
+[pcbnew/Netclasses]
+[pcbnew/Netclasses/Default]
+Name=Default
+Clearance=0.2
+TrackWidth=0.25
+ViaDiameter=0.8
+ViaDrill=0.4
+uViaDiameter=0.3
+uViaDrill=0.1
+dPairWidth=0.2
+dPairGap=0.25
+dPairViaGap=0.25
--- a/board/modbus_slave.sch
+++ b/board/modbus_slave.sch
--- a/board/modbus_slave.sch-bak
+++ b/board/modbus_slave.sch-bak
--- a/code/Builds/main.elf
+++ b/code/Builds/main.elf
--- a/code/Builds/main.hex
+++ b/code/Builds/main.hex
@@ -0,0 +1,120 @@
+:100000000C9434000C9451000C9451000C94510049
+:100010000C9451000C9451000C9451000C9451001C
+:100020000C9451000C9451000C9451000C9451000C
+:100030000C9451000C9451000C9451000C945100FC
+:100040000C9488030C9451000C9419010C948901B0
+:100050000C94CB010C9451000C9451000C94510061
+:100060000C9451000C94510011241FBECFEFD8E026
+:10007000DEBFCDBF11E0A0E0B1E0ECE5F7E002C0EB
+:1000800005900D92A230B107D9F722E0A2E0B1E0CD
+:1000900001C01D92A431B207E1F70E9473030C94D2
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+:1000B000922B909304018093030180910D0186306F
+:1000C00079F080910D01853059F0809111012091D6
+:1000D000100190E0922B9093060180930501089502
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+:1000F0000B010895809302010895CF93DF93EC01E3
+:100100006F5F09F43EC0FC01A62FB0E0BC016A0F8E
+:100110007B1F2FEF3FEF9081292798E0A9014170C5
+:10012000552736952795452B21F081E0282780EA31
+:100130003827915099F73196E617F70761F7A9012B
+:100140005527632F7727FE01EA0FFB1F808190E080
+:100150004817590749F01196AC0FBD1F20836C93C7
+:1001600080E0DF91CF910895AD014F5F5F4FDE01D9
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+:1002F000E0910701F0910801E45FFE4F9083809147
+:1003000007019091080101969093080180930701DD
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--- a/code/Builds/main.o
+++ b/code/Builds/main.o
--- a/code/Builds/modbus.o
+++ b/code/Builds/modbus.o
--- a/code/Builds/uart.o
+++ b/code/Builds/uart.o
--- a/code/Makefile
+++ b/code/Makefile
@@ -0,0 +1,55 @@
+TARGET  = main
+SRCS   := $(shell find -name '*.c')
+FILES   = $(SRCS:%.c=%) #main uart avrIOhelper/io-helper #uart#hier alle c-Datein reinschreiben, trennung durch "  " und ohne .c-Endung
+MCU     = atmega328p
+PROGC	= m328p
+CC      = avr-gcc
+TOOL    = atmelice_isp
+#TOOL    = avrispmkii
+#TOOL    = usbasp-clone
+
+BUILDDIR = Builds
+
+DEFINES = -I . -IInternet/MQTT -I Internet/MQTT/MQTTPacket/src -I Ethernet/W5500 -I Ethernet -DF_CPU=18432000UL -D_WIZCHIP_=W5100
+ 
+CFLAGS  =-mmcu=$(MCU) -O2 -Wall -Wpedantic $(DEFINES) -std=c99 -ffunction-sections -fdata-sections
+LDFLAGS =-mmcu=$(MCU) -Wl,--gc-sections
+
+LDFILES = $(foreach FILE,$(FILES),$(BUILDDIR)/$(FILE).o)
+
+all: clean $(BUILDDIR)/$(TARGET).elf
+
+$(BUILDDIR)/%.o: %.c
+	mkdir -p $(dir $@)
+	$(CC) $(CFLAGS) -c $< -o $(BUILDDIR)/$*.o
+
+$(BUILDDIR)/$(TARGET).elf: $(LDFILES)
+	mkdir -p $(dir $@)
+	$(CC) $(LDFLAGS) $(LDFILES) -o $(BUILDDIR)/$(TARGET).elf
+
+$(BUILDDIR)/$(TARGET).hex : $(BUILDDIR)/$(TARGET).elf
+	 avr-objcopy -j .data -j .text -O ihex $< $@
+
+fuse: 
+	avrdude -p $(PROGC) -c $(TOOL) -U lfuse:w:0xff:m -U hfuse:w:0xd9:m -U efuse:w:0xff:m 
+
+load: $(BUILDDIR)/$(TARGET).hex
+	avrdude -p $(PROGC) -c $(TOOL) -U flash:w:$(BUILDDIR)/$(TARGET).hex -v -B 250kHz
+
+program: clean load
+	
+size: $(BUILDDIR)/$(TARGET).elf
+	avr-size -C --mcu=$(MCU) $(BUILDDIR)/$(TARGET).elf
+
+.PHONY=clean
+clean:
+	rm -rf $(BUILDDIR)
+
+
+#Fuse m1284p external Osz. Long startuptime
+#  avrdude -c usbasp-clone -p m1284p -U lfuse:w:0xff:m -U hfuse:w:0xd9:m -U efuse:w:0xff:m
+
+#Fuse m1284p internal Osz. Long startuptime
+#  avrdude -c usbasp-clone -p m1284p -U lfuse:w:0xe2:m -U hfuse:w:0xd9:m -U efuse:w:0xff:m
+
+
--- a/code/main.c
+++ b/code/main.c
@@ -0,0 +1,108 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include "modbus.h"
+
+#define HIGH_LOW_CYCLE_TIME 1
+
+uint16_t holdingRegisters[4];
+
+void timer0100us_start(void) {
+	TCCR0B|=(1<<CS01); //prescaler 8
+	TIMSK0|=(1<<TOIE0);
+}
+
+//Return raw ADC data
+uint32_t HX711_get_data(uint8_t clk_PIN, uint8_t data_PIN, uint8_t gain_for_next_conv){
+    uint32_t data = 0;
+    for(uint8_t i = 0; i < 24; i++){    //Start 24bit transmission
+        PORTB |= (1 << clk_PIN);        //Set clock-PIN high
+        _delay_us(HIGH_LOW_CYCLE_TIME);
+        /*  Shift data to free LSB. Operation placed before writing data to avoid 
+            manuell shiftig after loop finsihed.*/
+        data <<= 1;                     
+        /*  Shift input-status of data containing bit to the
+            LSB and set all other bits to 0. Add result to
+            currently LSB in data-var.*/
+        data |= ((PINB>>data_PIN) & 0x01); //Read and store data
+        PORTB &= ~(1 << clk_PIN);        //Set clock-PIN low
+        _delay_us(HIGH_LOW_CYCLE_TIME);
+    }
+
+    /*  Add extra clk-pluses to set PGA-Gain for next conversion
+        1 extra pulse : Channel A Gain = 128
+        2 extra pluses: Channel B Gain = 32
+        3 extra pluses: Channel A Gain = 64*/
+    int8_t extra_clk_pluses = 1;
+    switch(gain_for_next_conv){
+        case 128: 
+            extra_clk_pluses = 1;
+            break;
+        case 64:
+            extra_clk_pluses = 3;
+            break;
+        case 32:
+            extra_clk_pluses = 2;
+            break;
+        default:
+         extra_clk_pluses = 1;
+    }
+    for(uint8_t i = 0; i < extra_clk_pluses; i++){
+        PORTB |= (1 << clk_PIN);    //set clock-PIN high
+        _delay_us(HIGH_LOW_CYCLE_TIME);
+        PORTB &= ~(1 << clk_PIN);   //set clock-PIN low
+        _delay_us(HIGH_LOW_CYCLE_TIME);
+    }
+
+    /*  Convert 24bit Two's complement to 32bit Two's complement
+        if MSB from 24Bit result is 1 aka negative*/
+    if(data & (1L<<23)){
+            data |= 0xFFL << 24;
+    }
+    return data;
+}
+
+void modbusGet(void) {
+	if (modbusGetBusState() & (1<<ReceiveCompleted))
+	{
+		switch(rxbuffer[1]) {
+			case fcReadHoldingRegisters:
+                PORTC |= 1 << 1;
+//                _delay_ms(10);
+//                PORTC &= ~(1 << 1);
+                uint32_t tmp = HX711_get_data(3, 4, 128); 
+                //int32_t tmp = -1000;
+                holdingRegisters[0] = tmp & 0xFFFF;
+                holdingRegisters[1] = (tmp>>16) & 0xFFFF;
+				modbusExchangeRegisters(holdingRegisters,0,4);
+			break;
+
+            default: {
+				modbusSendException(ecIllegalFunction);
+			}
+			break;
+		}
+	}
+}
+
+int main(void){
+    DDRC |= 3 << 0;
+    DDRB |= (1<<3);
+
+    modbusSetAddress(1);
+	modbusInit();
+    sei();
+
+    timer0100us_start();
+
+    while(1){
+        modbusGet();
+        //PORTC ^= 1 << 0;
+        //_delay_ms(100);
+        //PORTC &= ~(1 << 1);
+    }
+}
+
+ISR(TIMER0_OVF_vect) { //this ISR is called 9765.625 times per second
+	modbusTickTimer();
+}
--- a/code/modbus.c
+++ b/code/modbus.c
@@ -0,0 +1,433 @@
+/*************************************************************************
+Title:    Yet another (small) modbus (server) implementation for the avr.
+Author:   Max Brueggemann
+Hardware: any AVR with hardware UART, tested on Atmega 88/168 at 20Mhz
+License:  BSD-3-Clause
+          
+DESCRIPTION:
+    Refer to the header file yaMBSiavr.h.
+    
+USAGE:
+    Refer to the header file yaMBSiavr.h.
+                    
+LICENSE:
+
+Copyright 2017 Max Brueggemann, www.maxbrueggemann.de
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation
+and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its contributors
+may be used to endorse or promote products derived from this software without
+specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+THE POSSIBILITY OF SUCH DAMAGE.
+                        
+*************************************************************************/
+
+#include <avr/io.h>
+#include "modbus.h"
+#include <avr/interrupt.h>
+
+volatile unsigned char BusState = 0;
+volatile uint16_t modbusTimer = 0;
+volatile unsigned char rxbuffer[MaxFrameIndex+1];
+volatile uint16_t DataPos = 0;
+volatile unsigned char PacketTopIndex = 7;
+volatile unsigned char modBusStaMaStates = 0;
+volatile uint16_t modbusDataAmount = 0;
+volatile uint16_t modbusDataLocation = 0;
+
+/* @brief: save address and amount
+*
+*/
+void modbusSaveLocation(void)
+{
+	modbusDataLocation=(rxbuffer[3]|(rxbuffer[2]<<8));
+	if (rxbuffer[1]==fcPresetSingleRegister || rxbuffer[1]==fcForceSingleCoil) modbusDataAmount=1;
+	else modbusDataAmount=(rxbuffer[5]|(rxbuffer[4]<<8));
+}
+
+/* @brief: returns 1 if data location adr is touched by current command
+*
+*         Arguments: - adr: address of the data object
+*
+*/
+uint8_t modbusIsInRange(uint16_t adr)
+{
+        if((modbusDataLocation <= adr) && (adr<(modbusDataLocation+modbusDataAmount)))
+                return 1;
+        return 0;
+}
+
+/* @brief: returns 1 if range of data locations is touched by current command
+*
+*         Arguments: - startAdr: address of first data object in range
+*                    - lastAdr: address of last data object in range
+*
+*/
+uint8_t modbusIsRangeInRange(uint16_t startAdr, uint16_t lastAdr)
+{
+        if(modbusIsInRange(startAdr) && modbusIsInRange(lastAdr))
+                return 1;
+        return 0;
+}
+
+uint8_t modbusGetBusState(void)
+{
+	return BusState;
+}
+
+#if ADDRESS_MODE == SINGLE_ADR
+volatile unsigned char Address = 0x00;
+uint8_t modbusGetAddress(void)
+{
+	return Address;
+}
+
+void modbusSetAddress(unsigned char newadr)
+{
+	Address = newadr;
+}
+#endif
+
+#if PHYSICAL_TYPE == 485
+void transceiver_txen(void)
+{
+	TRANSCEIVER_ENABLE_PORT|=(1<<TRANSCEIVER_ENABLE_PIN);
+}
+
+ void transceiver_rxen(void)
+{
+	TRANSCEIVER_ENABLE_PORT&=~(1<<TRANSCEIVER_ENABLE_PIN);
+}
+#endif
+
+/* @brief: A fairly simple Modbus compliant 16 Bit CRC algorithm.
+*
+*  	Returns 1 if the crc check is positive, returns 0 and saves the calculated CRC bytes
+*	at the end of the data array if it fails.
+*  	
+*/
+uint8_t crc16(volatile uint8_t *ptrToArray,uint8_t inputSize) //A standard CRC algorithm
+{
+	uint16_t out=0xffff;
+	uint16_t carry;
+	unsigned char n;
+	inputSize++;
+	for (int l=0; l<inputSize; l++) {
+		out ^= ptrToArray[l];
+		for (n = 0; n < 8; n++) {
+			carry = out & 1;
+			out >>= 1;
+			if (carry) out ^= 0xA001;
+		}
+	}
+	//out=0x1234;
+	if ((ptrToArray[inputSize]==out%256) && (ptrToArray[inputSize+1]==out/256)) //check
+	{
+		return 1;
+	} else { 
+		ptrToArray[inputSize]=out%256; //append Lo
+		ptrToArray[inputSize+1]=out/256; //append Hi
+		return 0;	
+	}
+}
+
+/* @brief: copies a single bit from one char to another char (or arrays thereof)
+*
+*
+*/
+void listBitCopy(volatile uint8_t *source, uint16_t sourceNr,volatile uint8_t *target, uint16_t targetNr)
+{
+	if(*(source+(sourceNr/8))&(1<<(sourceNr-((sourceNr/8)*8))))
+	{
+		*(target+(targetNr/8))|=(1<<(targetNr-((targetNr/8)*8)));
+	} else *(target+(targetNr/8))&=~(1<<(targetNr-((targetNr/8)*8)));
+}
+
+/* @brief: Back to receiving state.
+*
+*/
+void modbusReset(void)
+{
+	BusState=(1<<TimerActive); //stop receiving (error)
+	modbusTimer=0;
+}
+
+void modbusTickTimer(void)
+{
+	if (BusState&(1<<TimerActive)) 
+	{
+		modbusTimer++;
+		if (BusState&(1<<Receiving)) //we are in receiving mode
+		{
+			if ((modbusTimer==modbusInterCharTimeout)) {
+				BusState|=(1<<GapDetected);
+			} else if ((modbusTimer==modbusInterFrameDelayReceiveEnd)) { //end of message
+				#if ADDRESS_MODE == MULTIPLE_ADR
+               		 if (crc16(rxbuffer,DataPos-3)) { //perform crc check only. This is for multiple/all address mode.
+				modbusSaveLocation();
+				BusState=(1<<ReceiveCompleted);
+			 } else modbusReset();
+				#endif
+				#if ADDRESS_MODE == SINGLE_ADR
+				if (rxbuffer[0]==Address && crc16(rxbuffer,DataPos-3)) { //is the message for us? => perform crc check
+					modbusSaveLocation();
+					BusState=(1<<ReceiveCompleted);
+				} else modbusReset();
+				#endif
+			}
+		} else if (modbusTimer==modbusInterFrameDelayReceiveStart){
+            BusState|=(1<<BusTimedOut);
+        }
+	}
+}
+
+ISR(UART_RECEIVE_INTERRUPT)
+{
+    unsigned char data;
+    data = UART_DATA;
+    //printf("%x ", data);
+    modbusTimer=0; //reset timer
+    if (!(BusState & (1<<ReceiveCompleted)) && !(BusState & (1<<TransmitRequested)) && !(BusState & (1<<Transmitting)) && (BusState & (1<<Receiving)) && !(BusState & (1<<BusTimedOut)))
+    {
+        if (DataPos>MaxFrameIndex) modbusReset();
+        else
+        {
+            rxbuffer[DataPos]=data;
+            DataPos++; //TODO: maybe prevent this from exceeding 255?
+        }	    
+    } else 
+        // Bus state is Timed out..
+        if (!(BusState & (1<<ReceiveCompleted)) && !(BusState & (1<<TransmitRequested)) && !(BusState & (1<<Transmitting)) && !(BusState & (1<<Receiving)) && (BusState & (1<<BusTimedOut))) 
+        { 
+            rxbuffer[0]=data;
+            BusState=((1<<Receiving)|(1<<TimerActive));
+            DataPos=1;
+        }
+}
+
+ISR(UART_TRANSMIT_INTERRUPT)
+{
+	BusState&=~(1<<TransmitRequested);
+	BusState|=(1<<Transmitting);
+	UART_DATA=rxbuffer[DataPos];
+	DataPos++;
+	if (DataPos==(PacketTopIndex+1)) {
+		UART_CONTROL&=~(1<<UART_UDRIE);
+	}
+}
+
+ISR(UART_TRANSMIT_COMPLETE_INTERRUPT)
+{
+	#if PHYSICAL_TYPE == 485
+	transceiver_rxen();
+	#endif
+	modbusReset();
+}
+
+void modbusInit(void)
+{
+	UBRRH = (unsigned char)((_UBRR) >> 8);
+	UBRRL = (unsigned char) _UBRR;
+	UART_STATUS = (1<<U2X); //double speed mode.
+#ifdef URSEL   // if UBRRH and UCSRC share the same I/O location , e.g. ATmega8
+	UCSRC = (1<<URSEL)|(3<<UCSZ0); //Frame Size
+#else
+    UCSRC = (3<<UCSZ0); //Frame Size
+#endif
+	UART_CONTROL = (1<<TXCIE)|(1<<RXCIE)|(1<<RXEN)|(1<<TXEN); // USART receiver and transmitter and receive complete interrupt
+	#if PHYSICAL_TYPE == 485
+	TRANSCEIVER_ENABLE_PORT_DDR|=(1<<TRANSCEIVER_ENABLE_PIN);
+	transceiver_rxen();
+	#endif
+	BusState=(1<<TimerActive);
+}
+
+/* @brief: Sends a response.
+*
+*         Arguments: - packtop: Position of the last byte containing data.
+*                               modbusSendException is a good usage example.
+*/
+void modbusSendMessage(unsigned char packtop)
+{
+	PacketTopIndex=packtop+2;
+	crc16(rxbuffer,packtop);
+	BusState|=(1<<TransmitRequested);
+	DataPos=0;
+	#if PHYSICAL_TYPE == 485
+	transceiver_txen();
+	#endif
+	UART_CONTROL|=(1<<UART_UDRIE);
+	BusState&=~(1<<ReceiveCompleted);
+}
+
+/* @brief: Sends an exception response.
+*
+*         Arguments: - exceptionCode
+*                              
+*/
+void modbusSendException(unsigned char exceptionCode)
+{
+	rxbuffer[1]|=(1<<7); //setting MSB of the function code (the exception flag)
+	rxbuffer[2]=exceptionCode; //Exceptioncode. Also the last byte containing data
+	modbusSendMessage(2);
+}
+
+
+/* @brief:  Returns the amount of requested data objects (coils, discretes, registers)
+*
+*/
+uint16_t modbusRequestedAmount(void)
+{
+	return modbusDataAmount;
+}
+
+/* @brief: Returns the address of the first requested data object (coils, discretes, registers)
+*
+*/
+uint16_t modbusRequestedAddress(void)
+{
+	return modbusDataLocation;
+}
+
+/* @brief: copies a single or multiple bytes from one array of bytes to an array of 16-bit-words
+*
+*/
+void intToModbusRegister(volatile uint16_t *inreg, volatile uint8_t *outreg, uint8_t amount)
+{
+	for (uint8_t c=0; c<amount; c++)
+	{
+			*(outreg+c*2) = (uint8_t)(*(inreg+c) >> 8);
+			*(outreg+1+c*2) = (uint8_t)(*(inreg+c));
+	}
+}
+
+/* @brief: copies a single or multiple 16-bit-words from one array of integers to an array of bytes
+*
+*/
+void modbusRegisterToInt(volatile uint8_t *inreg, volatile uint16_t *outreg, uint8_t amount)
+{
+	for (uint8_t c=0; c<amount; c++)
+	{
+		*(outreg+c) = (*(inreg+c*2) << 8) + *(inreg+1+c*2);
+	}
+}
+
+/* @brief: Handles single/multiple register reading and single/multiple register writing.
+*
+*         Arguments: - ptrToInArray: pointer to the user's data array containing registers
+*                    - startAddress: address of the first register in the supplied array
+*                    - size: input array size in the requested format (16bit-registers)
+*
+*/
+uint8_t modbusExchangeRegisters(volatile uint16_t *ptrToInArray, uint16_t startAddress, uint16_t size)
+{
+	if ((modbusDataLocation>=startAddress) && ((startAddress+size)>=(modbusDataAmount+modbusDataLocation))) {
+		
+		if ((rxbuffer[1]==fcReadHoldingRegisters) || (rxbuffer[1]==fcReadInputRegisters) )
+		{
+			if ((modbusDataAmount*2)<=(MaxFrameIndex-4)) //message buffer big enough?
+			{
+				rxbuffer[2]=(unsigned char)(modbusDataAmount*2);
+				intToModbusRegister(ptrToInArray+(modbusDataLocation-startAddress),rxbuffer+3,modbusDataAmount);
+				modbusSendMessage(2+rxbuffer[2]);
+				return 1;
+			} else modbusSendException(ecIllegalDataValue);
+		}
+		else if (rxbuffer[1]==fcPresetMultipleRegisters)
+		{
+			if (((rxbuffer[6])>=modbusDataAmount*2) && ((DataPos-9)>=rxbuffer[6])) //enough data received?
+			{
+				modbusRegisterToInt(rxbuffer+7,ptrToInArray+(modbusDataLocation-startAddress),(unsigned char)(modbusDataAmount));
+				modbusSendMessage(5);
+				return 1;
+			} else modbusSendException(ecIllegalDataValue);//too few data bytes received
+		}
+		else if (rxbuffer[1]==fcPresetSingleRegister)
+		{
+			modbusRegisterToInt(rxbuffer+4,ptrToInArray+(modbusDataLocation-startAddress),1);
+			modbusSendMessage(5);
+			return 1;
+		} 
+		//modbusSendException(ecSlaveDeviceFailure); //inapropriate call of modbusExchangeRegisters
+		return 0;
+		} else {
+		modbusSendException(ecIllegalDataValue);
+		return 0;
+	}
+}
+
+/* @brief: Handles single/multiple input/coil reading and single/multiple coil writing.
+*
+*         Arguments: - ptrToInArray: pointer to the user's data array containing bits
+*                    - startAddress: address of the first bit in the supplied array
+*                    - size: input array size in the requested format (bits)
+*
+*/
+uint8_t modbusExchangeBits(volatile uint8_t *ptrToInArray, uint16_t startAddress, uint16_t size)
+{
+	if ((modbusDataLocation>=startAddress) && ((startAddress+size)>=(modbusDataAmount+modbusDataLocation)))
+	{
+		if ((rxbuffer[1]==fcReadInputStatus) || (rxbuffer[1]==fcReadCoilStatus))
+		{
+			if (modbusDataAmount<=((MaxFrameIndex-4)*8)) //message buffer big enough?
+			{
+				rxbuffer[2]=(modbusDataAmount/8);
+				if (modbusDataAmount%8>0)
+				{
+					rxbuffer[(uint8_t)(modbusDataAmount/8)+3]=0x00; //fill last data byte with zeros
+					rxbuffer[2]++;
+				}
+				for (uint16_t c = 0; c<modbusDataAmount; c++)
+				{
+					listBitCopy(ptrToInArray,modbusDataLocation-startAddress+c,rxbuffer+3,c);
+				}
+				modbusSendMessage(rxbuffer[2]+2);
+				return 1;
+			} else modbusSendException(ecIllegalDataValue); //too many bits requested within single request
+		}
+		else if (rxbuffer[1]==fcForceMultipleCoils)
+		{
+			if (((rxbuffer[6]*8)>=modbusDataAmount) && ((DataPos-9)>=rxbuffer[6])) //enough data received?
+			{
+				for (uint16_t c = 0; c<modbusDataAmount; c++)
+				{
+					listBitCopy(rxbuffer+7,c,ptrToInArray,modbusDataLocation-startAddress+c);
+				}
+				modbusSendMessage(5);
+				return 1;
+			} else modbusSendException(ecIllegalDataValue);//exception too few data bytes received
+		}
+		else if (rxbuffer[1]==fcForceSingleCoil) {
+			listBitCopy(rxbuffer+4,0,ptrToInArray,modbusDataLocation-startAddress);
+			modbusSendMessage(5); 
+			return 1;
+		}
+		//modbusSendException(ecSlaveDeviceFailure); //inanpropriate call of modbusExchangeBits
+		return 0;
+	} else
+	{
+		modbusSendException(ecIllegalDataValue);
+		return 0;
+	}
+}
+
--- a/code/modbus.h
+++ b/code/modbus.h
@@ -0,0 +1,420 @@
+#ifndef yaMBIavr_H
+#define yaMBIavr_H
+/************************************************************************
+Title:    Yet another (small) Modbus (server) implementation for the avr.
+Author:   Max Brueggemann
+Hardware: any AVR with hardware UART, tested on Atmega 88/168 at 20Mhz
+License:  BSD-3-Clause
+
+LICENSE:
+
+Copyright 2017 Max Brueggemann, www.maxbrueggemann.de
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation
+and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its contributors
+may be used to endorse or promote products derived from this software without
+specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+THE POSSIBILITY OF SUCH DAMAGE.
+    
+************************************************************************/
+#include <avr/io.h>
+/** 
+ *  @code #include <yaMBSIavr.h> @endcode
+ * 
+ *  @brief   Interrupt-based Modbus implementation for small avr microcontrollers.
+ *           The Modbus implementation guidelines at modbus.org call for response
+ *           timeouts in the range of several seconds , hence only timing critical
+ *           parts have been implemented within ISRs. The actual handling of the Modbus
+ *           frame can easily be done in the main while loop.
+ *
+ *  @author Max Brueggemann www.maxbrueggemann.de
+ */
+
+/* define baudrate of modbus */
+#ifndef BAUD
+#define BAUD 38400L
+#endif
+
+/*
+* Definitions for transceiver enable pin.
+*/
+#ifndef TRANSCEIVER_ENABLE_PORT
+#define TRANSCEIVER_ENABLE_PORT PORTD
+#endif
+
+#ifndef TRANSCEIVER_ENABLE_PIN
+#define TRANSCEIVER_ENABLE_PIN 2
+#endif
+
+#ifndef TRANSCEIVER_ENABLE_PORT_DDR
+#define TRANSCEIVER_ENABLE_PORT_DDR DDRD
+#endif
+
+/**
+ * @brief    
+ *           At the moment the user has to set the value for Baudrate and
+ *           speed mode manually. The values depend on the operating frequency 
+ *           of your AVR and can be found in its datasheet.
+ */
+#if defined(__AVR_ATtiny2313__)
+#define UART_TRANSMIT_COMPLETE_INTERRUPT USART_TX_vect
+#define UART_RECEIVE_INTERRUPT   USART_RX_vect
+#define UART_TRANSMIT_INTERRUPT  USART_UDRE_vect
+#define UART_STATUS   UCSRA
+#define UART_CONTROL  UCSRB
+#define UART_DATA     UDR
+#define UART_UDRIE    UDRIE
+
+#elif defined(__AVR_ATmega164P__)
+#define UART_TRANSMIT_COMPLETE_INTERRUPT USART1_TX_vect
+#define UART_RECEIVE_INTERRUPT   USART1_RX_vect
+#define UART_TRANSMIT_INTERRUPT  USART1_UDRE_vect
+#define UART_STATUS   UCSR1A
+#define UART_CONTROL  UCSR1B
+#define UART_DATA     UDR1
+#define UART_UDRIE    UDRIE1
+#define UCSRC UCSR1C
+#define RXCIE RXCIE1
+#define TXCIE TXCIE1
+#define RXEN RXEN1
+#define TXEN TXEN1
+#define UCSZ0 UCSZ10
+#define U2X U2X1
+#define UBRRH UBRR1H
+#define UBRRL UBRR1L
+
+#elif defined(__AVR_ATmega168PA__)|(__AVR_ATmega88PA__)|(__AVR_ATmega328P__)|(__AVR_ATmega168P__)|(__AVR_ATmega88P__)
+#define UART_TRANSMIT_COMPLETE_INTERRUPT USART_TX_vect
+#define UART_RECEIVE_INTERRUPT   USART_RX_vect
+#define UART_TRANSMIT_INTERRUPT  USART_UDRE_vect
+#define UART_STATUS   UCSR0A
+#define UART_CONTROL  UCSR0B
+#define UART_DATA     UDR0
+#define UART_UDRIE    UDRIE0
+#define UCSRC UCSR0C
+#define RXCIE RXCIE0
+#define TXCIE TXCIE0
+#define RXEN RXEN0
+#define TXEN TXEN0
+#define UCSZ0 UCSZ00
+#define U2X U2X0
+#define UBRRH UBRR0H
+#define UBRRL UBRR0L
+
+#elif defined(__AVR_ATmega328PB__)
+#define UART_TRANSMIT_COMPLETE_INTERRUPT USART0_TX_vect
+#define UART_RECEIVE_INTERRUPT   USART0_RX_vect
+#define UART_TRANSMIT_INTERRUPT  USART0_UDRE_vect
+#define UART_STATUS   UCSR0A
+#define UART_CONTROL  UCSR0B
+#define UART_DATA     UDR0
+#define UART_UDRIE    UDRIE0
+#define UCSRC UCSR0C
+#define RXCIE RXCIE0
+#define TXCIE TXCIE0
+#define RXEN RXEN0
+#define TXEN TXEN0
+#define UCSZ0 UCSZ00
+#define U2X U2X0
+#define UBRRH UBRR0H
+#define UBRRL UBRR0L
+
+#elif defined(__AVR_ATtiny441__)
+#define UART_TRANSMIT_COMPLETE_INTERRUPT USART0_TX_vect
+#define UART_RECEIVE_INTERRUPT   USART0_RX_vect
+#define UART_TRANSMIT_INTERRUPT  USART0_UDRE_vect
+#define UART_STATUS   UCSR0A
+#define UART_CONTROL  UCSR0B
+#define UART_DATA     UDR0
+#define UART_UDRIE    UDRIE0
+#define UCSRC UCSR0C
+#define RXCIE RXCIE0
+#define TXCIE TXCIE0
+#define RXEN RXEN0
+#define TXEN TXEN0
+#define UCSZ0 UCSZ00
+#define U2X U2X0
+#define UBRRH UBRR0H
+#define UBRRL UBRR0L
+
+#elif defined(__AVR_ATmega8__)|| defined(__AVR_ATmega16__) || defined(__AVR_ATmega32__) || defined(__AVR_ATmega323__)
+#define UART_TRANSMIT_COMPLETE_INTERRUPT USART_TXC_vect
+#define UART_RECEIVE_INTERRUPT   USART_RXC_vect
+#define UART_TRANSMIT_INTERRUPT  USART_UDRE_vect
+#define UART_STATUS   UCSRA
+#define UART_CONTROL  UCSRB
+#define UART_DATA     UDR
+#define UART_UDRIE    UDRIE
+
+#elif defined(__AVR_AT90PWM3B__)
+#define UART_TRANSMIT_COMPLETE_INTERRUPT USART_TX_vect
+#define UART_RECEIVE_INTERRUPT   USART_RX_vect
+#define UART_TRANSMIT_INTERRUPT  USART_UDRE_vect
+#define UART_STATUS   UCSRA
+#define UART_CONTROL  UCSRB
+#define UART_DATA     UDR
+#define UART_UDRIE    UDRIE
+
+#elif defined(__AVR_ATmega1284P__)
+#define UART_TRANSMIT_COMPLETE_INTERRUPT USART0_TX_vect
+#define UART_RECEIVE_INTERRUPT   USART0_RX_vect
+#define UART_TRANSMIT_INTERRUPT  USART0_UDRE_vect
+#define UART_STATUS   UCSR0A
+#define UART_CONTROL  UCSR0B
+#define UART_DATA     UDR0
+#define UART_UDRIE    UDRIE0
+#define UCSRC UCSR0C
+#define RXCIE RXCIE0
+#define TXCIE TXCIE0
+#define RXEN RXEN0
+#define TXEN TXEN0
+#define UCSZ0 UCSZ00
+#define U2X U2X0
+#define UBRRH UBRR0H
+#define UBRRL UBRR0L
+
+#elif defined(__AVR_ATmega2560__)
+#define UART_TRANSMIT_COMPLETE_INTERRUPT USART3_TX_vect
+#define UART_RECEIVE_INTERRUPT   USART3_RX_vect
+#define UART_TRANSMIT_INTERRUPT  USART3_UDRE_vect
+#define UART_STATUS   UCSR3A
+#define UART_CONTROL  UCSR3B
+#define UART_DATA     UDR3
+#define UART_UDRIE    UDRIE3
+#define UCSRC UCSR3C
+#define RXCIE RXCIE3
+#define TXCIE TXCIE3
+#define RXEN RXEN3
+#define TXEN TXEN3
+#define UCSZ0 UCSZ30
+#define U2X U2X0
+#define UBRRH UBRR3H
+#define UBRRL UBRR3L
+
+#else
+#error "no definition available"
+#endif
+
+#ifndef F_CPU
+#error " F_CPU not defined "
+#else
+   #define _UBRR (F_CPU / 8 / BAUD ) -1
+#endif /* F_CPU */
+/*
+ * Available address modes.
+*/
+#define MULTIPLE_ADR 2
+#define SINGLE_ADR 1
+
+/*
+* Use SINGLE_ADR or MULTIPLE_ADR, default: SINGLE_ADR
+* This is useful for building gateways, routers or clients that for whatever reason need multiple addresses.
+*/
+#define ADDRESS_MODE SINGLE_ADR
+
+/*
+* Use 485 or 232, default: 485
+* Use 232 for testing purposes or very simple applications that do not require RS485 and bus topology.
+*/
+#define PHYSICAL_TYPE 485 //possible values: 485, 232
+
+#if BAUD>=19200
+#define modbusInterFrameDelayReceiveStart 16
+#define modbusInterFrameDelayReceiveEnd 18
+#define modbusInterCharTimeout 7
+#else
+#define modbusBlocksize 10
+#define modbusBlockTime ((float)modbusBlocksize*1000000)/((float) BAUD) //is 260 for 38400
+#define timerISROccurenceTime 100 //time in microseconds between two calls of modbusTickTimer
+#define modbusInterFrameDelayReceiveStart  (uint16_t)(modbusBlockTime*3.5/(float)timerISROccurenceTime)
+#define modbusInterFrameDelayReceiveEnd (uint16_t)(modbusBlockTime*4/(float)timerISROccurenceTime)
+#define modbusInterCharTimeout  (uint16_t)(modbusBlockTime*1.5/(float)timerISROccurenceTime)
+#endif
+
+
+/**
+ * @brief    Defines the maximum Modbus frame size accepted by the device. 255 is the default
+ *           and also the maximum value. However, it might be useful to set this to lower
+ *           values, with 8 being the lowest possible value, in order to save on ram space.
+ */
+#define MaxFrameIndex 255
+
+/**
+ * @brief    Modbus Function Codes
+ *           Refer to modbus.org for further information.
+ *           It's good practice to return exception code 01 in case you receive a function code
+ *           that you haven't implemented in your application.
+ */
+#define fcReadCoilStatus 1 //read single/multiple coils
+#define fcReadInputStatus 2 //read single/multiple inputs
+#define fcReadHoldingRegisters 3 //read analog output registers
+#define fcReadInputRegisters 4 //read analog input registers (2 Bytes per register)
+#define fcForceSingleCoil 5 //write single bit
+#define fcPresetSingleRegister 6 //write analog output register (2 Bytes)
+#define fcForceMultipleCoils 15 //write multiple bits
+#define fcPresetMultipleRegisters 16 //write multiple analog output registers (2 Bytes each)
+#define fcReportSlaveID 17 //read device description, run status and other device specific information
+
+/**
+ * @brief    Modbus Exception Codes
+ *           Refer to modbus.org for further information.
+ *           It's good practice to return exception code 01 in case you receive a function code
+ *           that you haven't implemented in your application.
+ */
+#define ecIllegalFunction 1 
+#define ecIllegalDataAddress 2 
+#define ecIllegalDataValue 3
+#define ecSlaveDeviceFailure 4
+#define ecAcknowledge 5
+#define ecSlaveDeviceBusy 6
+#define ecNegativeAcknowledge 7
+#define ecMemoryParityError 8
+
+/**
+ * @brief    Internal bit definitions
+ */
+#define BusTimedOut 0
+#define Receiving 1
+#define Transmitting 2
+#define ReceiveCompleted 3
+#define TransmitRequested 4
+#define TimerActive 5
+#define GapDetected 6
+
+/**
+* @brief    Configures the UART. Call this function only once.
+*/
+extern void modbusInit(void);
+
+/**
+* @brief    receive/transmit data array
+*/
+extern volatile unsigned char rxbuffer[MaxFrameIndex+1];
+
+/**
+* @brief    Current receive/transmit position
+*/
+extern volatile uint16_t DataPos;
+
+/**
+ * This only applies to single address mode.
+ */
+#if ADDRESS_MODE == SINGLE_ADR
+	/**
+	* @brief: Read the device address   
+	*/
+	extern uint8_t modbusGetAddress(void);
+
+	/**
+	* @brief: Set the device address
+	*         Arguments: - newadr: the new device address
+	*/
+	extern void modbusSetAddress(unsigned char newadr);
+#endif
+
+/* @brief: Sends a response.
+*
+*         Arguments: - packtop, index of the last byte in rxbuffer
+*                      that contains payload. Maximum value is
+*				       MaxFrameIndex-2.
+*/
+extern void modbusSendMessage(unsigned char packtop);
+
+/* @brief: Sends a Modbus exception.
+*
+*         Arguments: - exceptionCode
+*/
+extern void modbusSendException(unsigned char exceptionCode);
+
+/* @brief: Discards the current transaction. For MULTIPLE_ADR-mode and general
+*		   testing purposes. Call this function if you don't want to reply at all.
+*/
+void modbusReset(void);
+
+/**
+ * @brief    Call this function whenever possible and check if its return value has the ReceiveCompleted Bit set.
+ *           Preferably do this in the main while. I do not recommend calling this function within ISRs.
+ * @example  if (modbusGetBusState() & (1<<ReceiveCompleted)) {
+ *           modbusSendExcepton(ecIllegalFunction);
+ *           }
+ */
+extern uint8_t modbusGetBusState(void);
+
+/**
+ * @brief    Call every 100us using a timer ISR.
+ */
+extern void modbusTickTimer(void);
+
+/**
+ * @brief    Returns amount of bits/registers requested.
+ */
+extern uint16_t modbusRequestedAmount(void);
+
+/**
+ * @brief    Returns the address of the first requested bit/register.
+ */
+extern uint16_t modbusRequestedAddress(void);
+
+/* A fairly simple and hopefully Modbus compliant 16 Bit CRC algorithm.
+*  Returns 1 if the crc check is positive, returns 0 if it fails.
+*  Appends two crc bytes to the array.
+*/
+extern uint8_t crc16(volatile uint8_t *ptrToArray,uint8_t inputSize);
+
+/* @brief: Handles single/multiple input/coil reading and single/multiple coil writing.
+*
+*         Arguments: - ptrToInArray: pointer to the user's data array containing bits
+*                    - startAddress: address of the first bit in the supplied array
+*                    - size: input array size in the requested format (bits)
+*
+*/
+extern uint8_t modbusExchangeBits(volatile uint8_t *ptrToInArray, uint16_t startAddress, uint16_t size);
+
+/* @brief: Handles single/multiple register reading and single/multiple register writing.
+*
+*         Arguments: - ptrToInArray: pointer to the user's data array containing registers
+*                    - startAddress: address of the first register in the supplied array
+*                    - size: input array size in the requested format (16bit-registers)
+*
+*/
+extern uint8_t modbusExchangeRegisters(volatile uint16_t *ptrToInArray, uint16_t startAddress, uint16_t size);
+
+/* @brief: returns 1 if data location adr is touched by current command
+*
+*         Arguments: - adr: address of the data object
+*
+*/
+extern uint8_t modbusIsInRange(uint16_t adr);
+
+/* @brief: returns 1 if range of data locations is touched by current command
+*
+*         Arguments: - startAdr: address of first data object in range
+*                    - lastAdr: address of last data object in range
+*
+*/
+extern uint8_t modbusIsRangeInRange(uint16_t startAdr, uint16_t lastAdr);
+
+extern volatile uint16_t modbusDataAmount;
+extern volatile uint16_t modbusDataLocation;
+#endif
+
--- a/code/uart.c
+++ b/code/uart.c
@@ -0,0 +1,52 @@
+#include <avr/io.h>
+#include "uart.h"
+
+static int uart_putchar(char c, FILE *stream);
+
+FILE uart_output = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);
+
+void uart_init()
+{
+    DDRD |= 1 << 1; // TX
+    UART_BAUD_REGH  = (BAUDRATE>>8);
+    UART_BAUD_REGL  = BAUDRATE;               // set baud rate
+
+    UART_CTRL_REGB |= (1<<UART_TXEN_BM)
+                     //|(1<<UART_RXEN_BM)
+                     |(1<<UART_RXCIE_BM);     // enable receiver and transmitter
+
+    UART_CTRL_REGC |= (1<<UART_URSEL_BM)
+                     |(1<<UART_UCSZ0_BM)
+                     |(1<<UART_UCSZ1_BM);             // 8bit data format
+
+    stdout = &uart_output;
+}
+
+static int uart_putchar(char c, FILE *stream) {
+    if (c == '\n') {
+        uart_putchar('\r', stream);
+    }
+    loop_until_bit_is_set(UART_CTRL_REGA, UART_UDRE_BM);
+    UART_DATA_REG = c;
+    return 0;
+}
+
+void read_sync(char buffer[], uint8_t buffersize, uint8_t * bufferindex){
+    for(int i=0; i < buffersize; i++){
+        buffer[i]=0;
+    }
+    *bufferindex=0;
+
+    char input;
+    do{
+        while ((UART_CTRL_REGA & (1 << UART_RXC_BM)) == 0);
+        input = UART_DATA_REG;
+
+        putchar(input); //echo
+        buffer[*bufferindex]=input;
+        *bufferindex=*bufferindex+1;
+    }while(!(input == '\n' || input == '\r'));
+    buffer[*bufferindex]=0;
+    putchar('\n');
+}
+
--- a/code/uart.h
+++ b/code/uart.h
@@ -0,0 +1,37 @@
+#ifndef _UART_H_
+#define _UART_H_
+
+#include <stdio.h>
+
+#define BAUD 9600 
+#define BAUDRATE ((F_CPU)/(BAUD*16UL)-1)
+
+#define UART_BAUD_REGH UBRR0H
+#define UART_BAUD_REGL UBRR0L
+
+#define UART_CTRL_REGA UCSR0A
+#define UART_CTRL_REGB UCSR0B
+#define UART_CTRL_REGC UCSR0C
+
+// UCSRA
+#define UART_UDRE_BM UDRE0
+#define UART_RXC_BM RXC0
+
+// UCSRB
+#define UART_TXEN_BM TXEN0
+#define UART_RXEN_BM RXEN0
+#define UART_RXCIE_BM RXCIE0
+
+// UCSRC
+#define UART_URSEL_BM 0 /* only for old atmega */
+#define UART_UCSZ0_BM UCSZ00
+#define UART_UCSZ1_BM UCSZ01
+
+#define UART_DATA_REG UDR0
+
+void uart_init (void);
+void read_sync(char buffer[], uint8_t buffersize, uint8_t * bufferindex);
+
+#endif
+
+