STM32F437 ADC GPIO pin config

[John Hite]

Posted on April 10, 2017 at 21:07

We want to use ADC2 but it is not listed as an altenate function but as an additional function in RM0090. So I was wondering how I should configure the pins.

This is what I am guessing is correct:

GPIO_StructInit(&GPIO_InitStruct);

GPIO_InitStruct.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6;

GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;

GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStruct);

Thanks,

JH

[Tesla DeLorean]

Posted on April 10, 2017 at 21:19

Select them as AN pins as shown.

Then select channels on each ADC based on ADC123_IN12 naming, ie ADC1_IN4 wouldn't work on ADC2 or ADC3, but ADC12_IN5 would work on all but ADC3 as channel 5. 

NOTE Names made up for illustration purposes, review Data Sheet for specifics.

[John Hite]

Posted on April 11, 2017 at 14:39

Thanks.

jh