calibrating ADC stm32F0

[enrico.dallavia]

Hi, on the ST manual I read that calibrating the ADC is recommended, since this involve accessing a register before start the ADC, I'm wondering if this is implemented on chibios by default when I start the driver or if I have to do it manually.

[enrico.dallavia]

found the answer by myself,
inside file adc_lld.c on function adc_lld_init
there is the code I hoped for

Code: Select all

/* Calibration procedure.*/
  rccEnableADC1(FALSE);
  osalDbgAssert(ADC1->CR == 0, "invalid register state");
  ADC1->CR |= ADC_CR_ADCAL;
  osalDbgAssert(ADC1->CR != 0, "invalid register state");
  while (ADC1->CR & ADC_CR_ADCAL)
    ;
  rccDisableADC1(FALSE);

ChibiOs rules!

[enrico.dallavia]

only a question, from manual also I read

The calibration is initiated by software by setting bit ADCAL=1. Calibration can only be
initiated when the ADC is disabled (when ADEN=0). ADCAL bit stays at 1 during all the
calibration sequence. It is then cleared by hardware as soon the calibration completes. After
this, the calibration factor can be read from the ADC_DR register (from bits 6 to 0).

that means I have to manage the calibration factor on my own? or it is an information kept inside the chip that compensate the reading by itself?

Thanks

[Giovanni]

No, it is done automatically.

Giovanni

[enrico.dallavia]

awesome!
thanks!!!