RE: ADC Sequential Read Issue

phipi — Tue, 26 Sep 2017 16:50:15 GMT

That makes perfect sense, and I definitely missed that. Thanks!

RE: ADC Sequential Read Issue

Jørgen Holmefjord — Tue, 26 Sep 2017 15:33:28 GMT

Hi,

The reason why you see this behaviour is that you do not clear the allready set analog input when you configure the new input. Your code will enable one channel after another, until all your channels is enabled:

NRF_ADC->CONFIG |= (pin_number << ADC_CONFIG_PSEL_Pos);

What you need to do is to clear the previous channel before configuring a new channel:

NRF_ADC->CONFIG &= (~ADC_CONFIG_PSEL_Msk);
NRF_ADC->CONFIG |= (pin_number << ADC_CONFIG_PSEL_Pos);

Your code works because you clear the whole config when you set the resolution in ADC_pin_configure (by using the = sign, rather than |=):

NRF_ADC->CONFIG = ((ADC_CONFIG_RES_10bit << ADC_CONFIG_RES_Pos) & ADC_CONFIG_RES_Msk);

Best regards,

Jørgen