ejung/pt100-9ch
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working temperature measurement on ch0

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This commit is contained in:
Eggert Jung
2020-08-30 22:07:45 +02:00
parent 31c1e30b67
commit 9cb20143ee
1 changed files with 39 additions and 3 deletions
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42
newcode/main.c
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@@ -1,6 +1,9 @@
#include <avr/io.h> #include <avr/io.h>
#include <util/delay.h> #include <util/delay.h>
#include <avr/interrupt.h> #include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <stdlib.h>
#include <stddef.h>
#include "yaMBSiavr.h" #include "yaMBSiavr.h"
uint16_t inputStatus[9]; uint16_t inputStatus[9];
@@ -35,13 +38,44 @@ void init_timer_100us(){
TCC0.INTCTRLA |= TC_OVFINTLVL_MED_gc; TCC0.INTCTRLA |= TC_OVFINTLVL_MED_gc;
} }
void adc_init(void){
ADCA.CTRLB = 0x00;
ADCA.REFCTRL = ADC_REFSEL_VCC_gc;
ADCA.PRESCALER = ADC_PRESCALER_DIV512_gc;
uint8_t CalibrationByteL;
uint8_t CalibrationByteH;
NVM_CMD = NVM_CMD_READ_CALIB_ROW_gc;
CalibrationByteL = pgm_read_byte(offsetof(NVM_PROD_SIGNATURES_t, ADCACAL0));
CalibrationByteH = pgm_read_byte(offsetof(NVM_PROD_SIGNATURES_t, ADCACAL1));
NVM_CMD = NVM_CMD_NO_OPERATION_gc;
ADCA.CALL = CalibrationByteL;
ADCA.CALH = CalibrationByteH;
ADCA.CTRLA = ADC_ENABLE_bm;
ADCA.CH0.CTRL = ADC_CH_INPUTMODE_SINGLEENDED_gc;
ADCA.CH0.MUXCTRL = ADC_CH_MUXPOS_PIN0_gc;
}
uint16_t adc_read(void){
ADCA.CH0.CTRL |= ADC_CH_START_bm;
while(!(ADCA.CH0.INTFLAGS & ADC_CH_CHIF_bm));
ADCA.CH0.INTFLAGS = ADC_CH_CHIF_bm;
return ADCA.CH0.RES;
}
void modbusGet(void) { void modbusGet(void) {
if (modbusGetBusState() & (1<<ReceiveCompleted)) if (modbusGetBusState() & (1<<ReceiveCompleted))
{ {
switch(rxbuffer[1]) { switch(rxbuffer[1]) {
case fcReadHoldingRegisters: case fcReadHoldingRegisters: ;
inputStatus[0]=(~PORTC.IN) & 0xFF; float tmp[4];
modbusExchangeRegisters(inputStatus, 0, 8); tmp[0] = adc_read() - 170;
tmp[1] = (tmp[0])/ 3926 * 1.95;
tmp[2] = (tmp[1]*993)/(3.3-tmp[1]);
tmp[3] = (tmp[2]-100)/0.3927;
modbusExchangeRegisters(tmp, 0, 8);
break; break;
default: default:
modbusSendException(ecIllegalFunction); modbusSendException(ecIllegalFunction);
@@ -54,6 +88,8 @@ int main(void){
init_clk(); init_clk();
PORTD.DIRSET = 1 << 5; PORTD.DIRSET = 1 << 5;
adc_init();
PORTCFG.MPCMASK = 0xFF; PORTCFG.MPCMASK = 0xFF;
PORTC.PIN1CTRL = PORT_OPC_PULLUP_gc; PORTC.PIN1CTRL = PORT_OPC_PULLUP_gc;