diff options
| -rw-r--r-- | src/stm32/adc.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/stm32/adc.c b/src/stm32/adc.c index b6aa14b8..3998915f 100644 --- a/src/stm32/adc.c +++ b/src/stm32/adc.c @@ -34,6 +34,11 @@ static const uint8_t adc_pins[] = { #define CR2_FLAGS ADC_CR2_ADON #endif +// ADC timing: +// stm32f103: ADC clock=9Mhz, Tconv=12.5, Tsamp=28.5, total=4.556us +// stm32f407: ADC clock=21Mhz, Tconv=12, Tsamp=56, total=3.238us +// stm32f446: ADC clock=22.5Mhz, Tconv=12, Tsamp=56, total=3.022us + struct gpio_adc gpio_adc_setup(uint32_t pin) { @@ -72,7 +77,7 @@ gpio_adc_setup(uint32_t pin) #if CONFIG_MACH_STM32F1 // Perform calibration - udelay(timer_from_us(1)); + udelay(10); adc->CR2 = ADC_CR2_CAL | CR2_FLAGS; while (adc->CR2 & ADC_CR2_CAL) ; |