stm32f37x sdadc timer trigger support

[noah]

Hi all

The SDADC on the stm32f37x supports timer triggering, e.g. trigger SDADC3 from TIM12_CH2. There is no implementation in HAL 16 for enabling timer triggering, has someone done that before? The only option i see now would be to disable ADC HAL and do everything by hand...

Thanks for the reply
Cheers

[Giovanni]

Hi,

Can't it be enabled by setting properly CR2 in the group configuration structure? is there something missing?

Giovanni

[noah]

but there is no routine for initializing a timer channel for output compare when using the timer as GPT, is there?

[Giovanni]

Hi,

GPT is only able to generate TRGO events, SDADC cannot use TRGO for some reason, you could use the PWM driver which uses output compare events for the de-activation front.

Giovanni

[noah]

Finally figuered it out:

Code: Select all

#define SDADC_CR2_JEXTSEL_M(n)  ((n)<<8)
#define SDADC_CR2_JEXTEN_M(n)    ((n)<<13)
static const ADCConversionGroup adcgrpcfg1 = {
  TRUE, // circular
  ADC_GRP1_NUM_CHANNELS, // num_channels
  adccallback, // end_cb
  adcerrorcallback, // error_cb
  .u.sdadc = {
    /* CR2: select rising edge of TIM12_CH2*/
    SDADC_CR2_JEXTSEL_M(0x02) | SDADC_CR2_JEXTEN_M(0x01), // thats the important stuff
    SDADC_JCHGR_CH(ADC_GRP1_CHANNEL),
    {                       
      SDADC_CONFCHR1_CH6(0), //
      SDADC_CONFCHR1_CH6(0), // use configuration 0 for channel 6
    }
  }
};

then simply just start the correct timer as PWM output (PWMD2 CH4 in my case) and launch a continous conversion using adcStartConversion and you're good.

Thanks for the hint @Giovanni!