KevinLy[m]: > <@kebonly:matrix.org> (Sorry, I don't know how to format this message with line breaks)
> I'm just trying to read analog data (from potentiometer) through the ADC of an STM32F303 (on the discovery board).
> 
> My minimum programming involves:
> let rcc = unsafe { &\*RCC::ptr() };
> let adc = unsafe { &\*ADC1::ptr() };
> 
> rcc.ahbenr.write(|w| w.adc12en().enabled());
> adc.cr.write(|w| {
> w.advregen().intermediate();
> w.advregen().enabled();
> w.aden().enabled()
> });
> // some other stuff
> hprint!("{}\\n", adc.isr.read().adrdy().is\_ready()); // to check if adc is ready
> 
> When I run the print statement in a loop to check if the adc is ever ready for conversion, it always reads "false." Am I missing any step for setting up the ADC? I'm referring to the data sheet for the STM32F303 to see the startup sequence.
> 
> A related question: Given that there is a startup time for the ADC after writing to the advregen, how do I know that I allow sufficient time between successive writes to the advregen bits?

I expect that since you are updating the ADC each time, it doesn't have enough time to produce a result