stm32: Fix ADC on stm32f042

It seems the stm32f042 chip needs a small delay during ADC enable. Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
2021-12-24 19:27:04 -05:00 · 2021-12-24 19:27:04 -05:00 · 247cd753e2
parent 9f31a35e75
commit 247cd753e2
1 changed files with 1 additions and 0 deletions
--- a/src/stm32/stm32f0_adc.c
+++ b/src/stm32/stm32f0_adc.c
@ -91,6 +91,7 @@ gpio_adc_setup(uint32_t pin)
            ;
        // Enable ADC
        adc->ISR = ADC_ISR_ADRDY;
+        adc->ISR; // Dummy read to make sure write is flushed
        adc->CR = CR_FLAGS | ADC_CR_ADEN;
        while (!(adc->ISR & ADC_ISR_ADRDY))
            ;