ejung/xmega-modbus-pt100
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move calibration values to defines

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This commit is contained in:
Eggert Jung
2020-09-01 02:30:45 +02:00
parent 5aa7faeb7f
commit c4ffe80e80
1 changed files with 10 additions and 5 deletions
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15
newcode/main.c
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@@ -8,10 +8,15 @@
#define AVRG 512
#define SUPPLY_VOLTS 3.3
#define REF_OHMS 993.5
#define ADC_0V_COUNT 170
#define ADC_MAX_VOLT 1.95
volatile uint16_t adc_buffer[AVRG];
volatile float ch_values[9];
void init_clk(void)
{
// ========= System Clock configuration =========
@@ -160,10 +165,10 @@ ISR(DMA_CH0_vect){
ADCA.CH0.MUXCTRL = pin << ADC_CH_MUXPOS_gp; // give MUX time to switch during averaging
float temp = avrg(adc_buffer, AVRG);
temp = temp - 170;
temp = (temp)/ 3926 * 1.95;
temp = (temp*993.5)/(3.3-temp);
temp = (temp-100)/0.3927;
temp = temp - ADC_0V_COUNT;
temp = (temp)/ (4096-ADC_0V_COUNT) * ADC_MAX_VOLT;
temp = (temp * REF_OHMS)/(SUPPLY_VOLTS - temp);
temp = (temp-100)/0.3927; //pt100 formula
ch_values[old_pin] = temp;
DMA.CH0.TRIGSRC = DMA_CH_TRIGSRC_ADCA_CH0_gc;