Hi,
I'm using STM32F767 and it's ADC. This STM has 3 ADC.
I configured the ADC1 & ADC2 in multimode which is triggered by a timer. I also use DMA for data transfer. ADC1 and ADC2 both convert 2 channels (I measure voltage and current of two channels simultaneously).
ADC3 is configured as standalone to convert 5 channels, software started, also using DMA.
Configuring is done with HAL-libray.
ADC1 and ADC2 are working correct, but when I start the ADC3 no interrupt is generated of ADC3. I looked into HAL-driver for ADC start with DMA and the problem there is, when one ADC is configured in Multi-Mode, no software start is possible for another ADC.
When I doesn't configure ADC1 and ADC2 in Multi-mode and doesn't start it, ADC3 is running correctly. When I start ADC3 with DMA, the Bit ADC_CR2_SWSTART is set. But with ADC1 & ADC2 in Multi-mode, this bit is never set becaus of line 1.
Here is a code part of HAL Library (function HAL_ADC_Start_DMA):
...
1 if(HAL_IS_BIT_CLR(ADC->CCR, ADC_CCR_MULTI))
2 {
3 /* if no external trigger present enable software conversion of regular channels */
4 if((hadc->Instance->CR2 & ADC_CR2_EXTEN) == RESET)
5 {
6 /* Enable the selected ADC software conversion for regular group */
7 hadc->Instance->CR2 |= (uint32_t)ADC_CR2_SWSTART;
8 }
9 }
10 else
11 {
12 /* if instance of handle correspond to ADC1 and no external trigger present enable
13 software conversion of regular channels */
14 if((hadc->Instance == ADC1) && ((hadc->Instance->CR2 & ADC_CR2_EXTEN) == RESET))
15 {
16 /* Enable the selected ADC software conversion for regular group */
17 hadc->Instance->CR2 |= (uint32_t)ADC_CR2_SWSTART;
18 }
19}
...
If I comment line 1,2 and 9, everything is working. ADC1 and ADC2 are running with timer trigger and ADC3 is running with software trigger.
Is this a fault of HAL-driver or is it just not a good idea to run ADC as I want?
Thanks for helping.
Dani
