Posted on March 09, 2016 at 10:14
I have a thread set up to constantly read 18 ADCs across ADC and ADC3 and fill them into arrays.
void TSK_AdcSensor(void const *argument){
ADC1_Configuration();
ADC3_Configuration();
//Clear the ADC value registers
for (i=0; i<
MAX_ADC1_CHANNELS
; i++){
adc1Sensor[i] = 0;
}
for (
i
=
0
; i<MAX_ADC3_CHANNELS; i++){
adc3Sensor[i] = 0;
}
while(1){
//Start ADC1 software conversion
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
//Start ADC3 software conversion
ADC_SoftwareStartConvCmd(ADC3, ENABLE);
//wait for DMA to finish:
result1
=
osSignalWait
(ADC1FINISHED, osWaitForever);
result2
=
osSignalWait
(ADC3FINISHED, osWaitForever);
for(
i
=
0
; i<MAX_ADC1_CHANNELS; i++){
adc1Sensor[i] += ADC1_SensorValues[i];
}
for(
j
=
0
; j<MAX_ADC3_CHANNELS; j++){
adc3Sensor[j] += ADC3_SensorValues[j];
}
ADCcounter++;
if(ADCcounter>=100){
for(i=0; i<MAX_ADC1_CHANNELS; i++){
adcSensor[i]=(float)adc1Sensor[i]/ADCcounter;
adc1Sensor[i]=0;
//printf(''\n\radc1[%i]=%.1f\n\r'',i,adcSensor[i]);
}
for(j=0; j<MAX_ADC3_CHANNELS; j++){
adcSensor[j+MAX_ADC1_CHANNELS]=(float)adc3Sensor[j]/ADCcounter;
adc3Sensor[j]=0;
//printf(''\n\radc3[%i]=%.1f\n\r'',j,adcSensor[j+MAX_ADC1_CHANNELS]);
}
ADCcounter=0;
}
osDelay(5);
}//end while(1)
}
I also have a function that sets one of two output DAC channels upon receipt of the desired setting from the usart
void RegSetDAC(u8 reg_select, u16 reg_value)
{
DAC_Configuration();
if(reg_select == 1)
{
if(reg_value > 1250)
printf(''\n\r *E*0** regulator 1 out of range\n\r'');
else
{
dac_value1=0;
dac_value1=EPC1(reg_value);
osDelay(100);
// Set DAC Channel2 DHR12Rregister
DAC_SetChannel2Data(DAC_Align_12b_R, dac_value1);
// Start DAC Channel2 conversion by software
DAC_SoftwareTriggerCmd(DAC_Channel_2, ENABLE);
printf(''*E*%u*%u**\t\n\r '' ,reg_select,reg_value);
}
}
else if (reg_select == 2)
{
if(reg_value > 100)
printf(''\n\r *E*0** regulator 2 out of range\n\r'');
else
{
dac_value2=0;
dac_value2=EPC2(reg_value);
osDelay(100);
// Set DAC Channel1 DHR12R register
DAC_SetChannel1Data(DAC_Align_12b_R, dac_value2);
// Start DAC Channel1 conversion by software
DAC_SoftwareTriggerCmd(DAC_Channel_1, ENABLE);
printf(''*E*%u*%u**\t\n\r '' ,reg_select,reg_value);
}
}
// printf(''*%f*%f**\t\n\r '' ,dac_value1,dac_value2);
}
The dac function works perfectly, until I enable the thread
TSK_AdcSensor.
The dac output will then give nonsense values.
By process of elimination I have found that commenting
//ADC1_Configuration();
//ADC3_Configuration();
and
//Start ADC1software conversion
//ADC_SoftwareStartConvCmd(ADC1,ENABLE);
//Start ADC3 softwareconversion
//ADC_SoftwareStartConvCmd(ADC3, ENABLE);
Allow the dac to work as normal. But I cannot see why?
The printf after I set the DAC channel shows the correct value, but the voltage reading at the output does not correspond
Anyone have any idea's?
#adc #dac #stm32f1
