diff options
Diffstat (limited to 'chip/stm32/adc-stm32f.c')
| -rw-r--r-- | chip/stm32/adc-stm32f.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/chip/stm32/adc-stm32f.c b/chip/stm32/adc-stm32f.c index d6ff369ef9..072c71b9df 100644 --- a/chip/stm32/adc-stm32f.c +++ b/chip/stm32/adc-stm32f.c @@ -16,6 +16,16 @@ #define ADC_SINGLE_READ_TIMEOUT 3000 /* 3 ms */ +#define SMPR1_EXPAND(v) ((v) | ((v) << 3) | ((v) << 6) | ((v) << 9) | \ + ((v) << 12) | ((v) << 15) | ((v) << 18) | \ + ((v) << 21)) +#define SMPR2_EXPAND(v) (SMPR1_EXPAND(v) | ((v) << 24) | ((v) << 27)) + +/* Default ADC sample time = 13.5 cycles */ +#ifndef CONFIG_ADC_SAMPLE_TIME +#define CONFIG_ADC_SAMPLE_TIME 2 +#endif + struct mutex adc_lock; static int watchdog_ain_id; @@ -290,11 +300,8 @@ static void adc_init(void) /* Set right alignment */ STM32_ADC_CR2 &= ~(1 << 11); - /* - * Set sample time of all channels to 13.5 cycles. - * Conversion takes 15.75 us. - */ - STM32_ADC_SMPR1 = 0x00492492; - STM32_ADC_SMPR2 = 0x12492492; + /* Set sample time of all channels */ + STM32_ADC_SMPR1 = SMPR1_EXPAND(CONFIG_ADC_SAMPLE_TIME); + STM32_ADC_SMPR2 = SMPR2_EXPAND(CONFIG_ADC_SAMPLE_TIME); } DECLARE_HOOK(HOOK_INIT, adc_init, HOOK_PRIO_DEFAULT); |