add temperature reading on adc channels

Makefile

@@ -13,7 +13,8 @@ BUILDDIR = Builds
 DEFINES = -I . -IInternet/MQTT -I Internet/MQTT/MQTTPacket/src -I Ethernet/W5500 -I Ethernet -DF_CPU=16000000UL -D_WIZCHIP_=W5100
  
 CFLAGS  =-mmcu=$(MCU) -O2 -Wall -Wpedantic $(DEFINES) -std=c99 -ffunction-sections -fdata-sections
-LDFLAGS =-mmcu=$(MCU) -Wl,--gc-sections
+#LDFLAGS =-mmcu=$(MCU) -Wl,--gc-sections
+LDFLAGS =-mmcu=$(MCU) -Wl,--gc-sections,-u,vfprintf -lprintf_flt
 
 LDFILES = $(foreach FILE,$(FILES),$(BUILDDIR)/$(FILE).o)
 

avrIOhelper/io-helper.h

@@ -97,4 +97,6 @@ void ioHelperEdgeDetector(void);
 #define IN_NOTAUS_ANLAGE        BitPinF7
 #define IN_NOTAUS_SCHRANK       BitPinK0
 
+#define IN_KLATWASSER_DRAN      BitPinF6
+
 #endif

main.c

@@ -1,6 +1,7 @@
 #include <avr/io.h>
 #include <avr/interrupt.h>
 #include <avr/wdt.h> // WatchDog          
+#include <stdint.h>
 #include <string.h>
 
 #include "Ethernet/socket.h"
@@ -14,10 +15,11 @@
 #include "uart.h"
 #include "spi.h"
 #include "mqtt.h"
+#include "temperature.h"
 
 #include "util/delay.h"
 
-#define PLC_MQTT_ENABLED 0
+#define PLC_MQTT_ENABLED 1
 
 Client mqtt_client;
 
@@ -88,6 +90,18 @@ void do_notaus(){
     }
 }
 
+void send_values(void){
+    char msg[10];
+    for(uint8_t i=0; i<sizeof(ADC_reading)/sizeof(ADC_reading[0]);i++){
+        char msg[64];
+        char tpc[64];
+        sprintf(msg, "%.1f", ADC_reading[i]);
+        sprintf(tpc, "/Filamentanlage/02_Wasserbecken/state/temp%d", i);
+        mqtt_pub(&mqtt_client, tpc, msg, strlen(msg));
+    }
+
+}
+
 int main()
 {
     // INIT MCU
@@ -135,11 +149,11 @@ int main()
         while(1); //Reboot the board
     }
 
-    // Subscribe to all topics
-    char SubString[] = "/Filamentanlage/02_Wasserbecken/#";
-    //char SubString[] = "/Filamentanlage/03_Wasserbecken/#";
-    mqtt_rc = MQTTSubscribe(&mqtt_client, SubString, QOS0, messageArrived);
-    printf("Subscribed (%s) %ld\r\n", SubString, mqtt_rc);
+    //// Subscribe to all topics
+    //char SubString[] = "/Filamentanlage/02_Wasserbecken/#";
+    ////char SubString[] = "/Filamentanlage/03_Wasserbecken/#";
+    //mqtt_rc = MQTTSubscribe(&mqtt_client, SubString, QOS0, messageArrived);
+    //printf("Subscribed (%s) %ld\r\n", SubString, mqtt_rc);
 #endif
 
 
@@ -162,6 +176,9 @@ int main()
         if(millis() - timer_blink_outs > 500){
             outStates[0] ^= outStatesBlinking[0];
             outStates[1] ^= outStatesBlinking[1];
+#if PLC_MQTT_ENABLED
+            send_values();
+#endif
             timer_blink_outs = millis();
         }
 
@@ -217,6 +234,7 @@ static void avr_init(void)
 
     timer0_init();// Timer0 millis engine init
     uart_init();
+    initADC();
 
     sei(); //re-enable global interrupts
 

temperature.c

@@ -0,0 +1,33 @@
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <stdint.h>
+
+volatile float ADC_reading[5] = {0,0,0,0,0};
+
+void initADC(void)
+{
+    ADMUX = 1 << REFS0 | 0 << REFS1; //Select external Vref
+    ADCSRA = _BV(ADEN) | _BV(ADIE); // enable adc, enable interrupt
+    ADCSRA |= 1 << ADPS2 | 1 << ADPS1 | 1 << ADPS0; // set clock-prescaler to 128
+    ADCSRA |= 1 << ADSC; // start conversion
+}
+
+void adc_set_channel(uint8_t ch){
+    ADMUX = (ADMUX & 0xE0) | (ch & 0x1F);
+}
+
+ISR(ADC_vect)
+{
+    static uint8_t ch = 0;
+    //Reading 10bit conversion result
+    uint16_t tmp = ADCL;       //copy the first LSB bits
+    tmp |= ADCH << 8; //copy remaing byte
+
+    ADC_reading[ch] = (((float)tmp * 0.3));
+    //ADC_reading[ch] = (((float)tmp * 0.03)/0.092)-2.3;
+
+    ch = (ch + 1)%5;
+    adc_set_channel(ch);
+
+    ADCSRA |= (1 << ADSC); //Start next conversion
+}

temperature.h

@@ -0,0 +1,9 @@
+#ifndef _TEMPERATURE_H_
+#define _TEMPERATURE_H_
+
+#include <stdint.h>
+
+extern volatile float ADC_reading[5];
+void initADC(void);
+
+#endif