'H7 ADC offset correction in oversampling mode

[waclawek.jan]

Which one is true?

JW

[Byann.1]

I'm facing to the same problem. I tried to use hardware oversampling and offset but I could not get the good conversion. 

As show in the previous post with some screenshot of the reference manual,  I don't know if it's possible or not.

Please find also below, another sentence describing some restrictions on oversampling.

Finally my question: is it possible to use both oversampling and offset?

If yes, how to use it and what are exactly the restrictions?

Thanks in advanced for your help

[Imen.D]

Hello @Byann.1 ,

Please refer to the last release of RM0433 which contains update and correction.

The contradiction in the RM0433 Rev6 mentioned by waclawek.jan was already corrected in the Section: "Single ADC operating modes support when oversampling" to remove the mention that the offset correction is not supported in oversampling mode.

[Zed]

For those who still looking for the offset implementation in oversampling mode I paste here a line from a program that seems to work:

if (HAL_OK == HAL_ADC_Stop_DMA(&hadc2))
{
  LL_ADC_SetOffset(hadc2.Instance, LL_ADC_OFFSET_1, LL_ADC_CHANNEL_3, offset << 10);  // 10 At the end means that you use 10 bit shifting oversampling
}

 This has something to do with where exactly this offset would be substracted - before oversampling or after oversampling. An RM states that clearly somewhere. Don know exact place, but it is there.