update LED in readme

README.md

@@ -0,0 +1,85 @@
+# Wägetransmitter Modbus
+
+Ein Steuergerät zum Auslesen einer Wägezelle, angebunden über Modbus RTU.
+Die Wandlung des analogen Wägezellen-Signals basiert auf dem HX711 IC;
+auf einem Atmel AVR (ATmega328p) ist der Modbus-Slave implementiert.
+
+|![3D Model](board/pics/3d-board.png)|![eingebaut](board/pics/picture.png)|
+|:---:|:---:|
+
+### Schnittstellenparameter RS485/Modbus RTU
+
+| Parameter      | Wert   |
+|----------------|--------|
+| Baudrate       | 115200 |
+| Datenbits      | 8      |
+| Parität        | none   |
+| Stopbits       | 1      |
+| Modbus Adresse | 1      |
+
+Das Gerät stellt den 24-bit ADC Wert in 2er-Komplement Darstellung über zwei
+Holding-Register bereit. Somit ergibt sich ein 32-bit signed Integer Datentyp.
+
+| Register Adresse | Wert      |
+|------------------|-----------|
+| 0                | ADC[0:15] |
+| 1                | 8xADC[23],ADC[22:16]|
+
+#### Beispiel:
+Abfragen des Wertes mit dem Tool modpoll (https://www.modbusdriver.com/modpoll.html)
+```
+user@pc:~$ modpoll -b 115200 -p none -t4:int /dev/ttyUSB0
+modpoll 3.10 - FieldTalk(tm) Modbus(R) Master Simulator
+Copyright (c) 2002-2021 proconX Pty Ltd
+Visit https://www.modbusdriver.com for Modbus libraries and tools.
+
+Protocol configuration: Modbus RTU, FC3
+Slave configuration...: address = 1, start reference = 1, count = 1
+Communication.........: /dev/ttyUSB0, 115200, 8, 1, none, t/o 1.00 s, poll rate 100 ms
+Data type.............: 32-bit integer, output (holding) register table
+
+-- Polling slave... (Ctrl-C to stop)
+[1]: -242457
+-- Polling slave... (Ctrl-C to stop)
+[1]: -242440
+```
+
+### HX711
+
+Über den Jumper `JP1` kann eine Samplerate von 10Hz oder 80Hz gewählt werden.
+
+### LEDs
+
+| LED | Signal |
+|-----|--------|
+| D1  | Bus Error |
+| D2  | Bus Transmission       |
+| D3  | 5V Rail    |
+
+### Klemmenbelegung
+![fab](board/pics/board-fab.svg)
+
+#### J1
+| Klemme | Signal                         |
+|--------|--------------------------------|
+| 24V    | Spannungsversorgung 9V bis 24V |
+| GND    | Masse (Bus und Versorgung)     |
+| A+ / B-| RS485 Bus Leitungen            |
+| LEDn+  | Externe LED Anode (selbes Signal, wie intern)|
+| LEDn-  | Externe LED Kathode            |
+
+#### J4
+| Klemme | Signal                         |
+|--------|--------------------------------|
+| E+     | Spannungsversorgung Wägezelle  |
+| E-     | Masse                          |
+| INA-   | Messsignal 1                   |
+| INA+   | Messsignal 2                   |
+
+### Schaltplan
+![schematic](board/pics/schematic.svg)
+
+### Mechanische Dimensionen
+![dimensions](board/pics/board.svg)
+
+

code/Builds/main.hex

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code/Makefile

@@ -1,6 +1,6 @@
 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
+FILES   = $(SRCS:%.c=%)
 MCU     = atmega328p
 PROGC	= m328p
 CC      = avr-gcc
@@ -10,7 +10,7 @@ TOOL    = atmelice_isp
 
 BUILDDIR = Builds
 
-DEFINES = -I . -IInternet/MQTT -I Internet/MQTT/MQTTPacket/src -I Ethernet/W5500 -I Ethernet -DF_CPU=18432000UL -D_WIZCHIP_=W5100
+DEFINES = -DF_CPU=18432000UL
  
 CFLAGS  =-mmcu=$(MCU) -O2 -Wall -Wpedantic $(DEFINES) -std=c99 -ffunction-sections -fdata-sections
 LDFLAGS =-mmcu=$(MCU) -Wl,--gc-sections
@@ -45,11 +45,3 @@ size: $(BUILDDIR)/$(TARGET).elf
 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
-
-

code/compile_flags.txt

@@ -0,0 +1,7 @@
+-D
+__AVR_ATmega328P__
+-D
+F_CPU=18432000UL
+-I
+/usr/lib/avr/include
+

code/main.c

@@ -1,18 +1,16 @@
 #include <avr/io.h>
 #include <avr/interrupt.h>
+#include <stdint.h>
 #include <util/delay.h>
 #include "modbus.h"
 
-#define HIGH_LOW_CYCLE_TIME 1
+#define HIGH_LOW_CYCLE_TIME 10
 
 uint16_t holdingRegisters[4];
 
-void timer0100us_start(void) {
+volatile uint32_t led_on_timer[3];
-	TCCR0B|=(1<<CS01); //prescaler 8
-	TIMSK0|=(1<<TOIE0);
-}
 
-//Return raw ADC data
+// 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
@@ -67,19 +65,21 @@ void modbusGet(void) {
     {
         switch(rxbuffer[1]) {
             case fcReadHoldingRegisters:
-                PORTC |= 1 << 1;
+                PORTC |= 1 << 0;
-//                _delay_ms(10);
+                led_on_timer[0]=1000;
-//                PORTC &= ~(1 << 1);
+
+                while(PINB & (1<<4)); // wait for data ready
+
                 uint32_t tmp = HX711_get_data(3, 4, 128); 
-                //int32_t tmp = -1000;
                 holdingRegisters[0] = tmp & 0xFFFF;
                 holdingRegisters[1] = (tmp>>16) & 0xFFFF;
+                holdingRegisters[2] = led_on_timer[1];
                 modbusExchangeRegisters(holdingRegisters,0,4);
                 break;
-
+            default:
-            default: {
+                PORTC |= 1 << 1;
+                led_on_timer[1]=1000;
                 modbusSendException(ecIllegalFunction);
-			}
                 break;
         }
     }
@@ -93,16 +93,22 @@ int main(void){
     modbusInit();
     sei();
 
-    timer0100us_start();
+    /* modbus tick timer */
+    TCCR0B|=(1<<CS01);
+    TIMSK0|=(1<<TOIE0);
 
     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();
+
+    for(uint8_t i=0; i<2; i++){
+        if(led_on_timer[i]>0)
+            led_on_timer[i]--;
+        else
+            PORTC &= ~(1<<i);
+    }
 }

code/modbus.h

@@ -52,7 +52,7 @@ THE POSSIBILITY OF SUCH DAMAGE.
 
 /* define baudrate of modbus */
 #ifndef BAUD
-#define BAUD 38400L
+#define BAUD 115200L
 #endif
 
 /*

code/uart.c

@@ -1,52 +0,0 @@
-#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');
-}
-

code/uart.h

@@ -1,37 +0,0 @@
-#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
-
-