void adc_config(void)
{
LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_ADC1);
/* ADC might be in deep sleep, needs to be woken up twice in that case */
LL_ADC_Enable(ADC1);
LL_mDelay(1);
LL_ADC_Enable(ADC1);
LL_mDelay(1);
LL_ADC_StartCalibration(ADC1);
while (LL_ADC_IsCalibrationOnGoing(ADC1));
LL_ADC_SetSequencersScanMode(ADC1, LL_ADC_SEQ_SCAN_DISABLE);
LL_ADC_REG_SetTriggerSource(ADC1, LL_ADC_REG_TRIG_SOFTWARE);
LL_ADC_REG_SetSequencerLength(ADC1, LL_ADC_REG_SEQ_SCAN_DISABLE);
}
static int adc_stm32_init(struct device *dev)
{
struct adc_stm32_data *data = dev->driver_data;
const struct adc_stm32_cfg *config = dev->config->config_info;
struct device *clk =
device_get_binding(STM32_CLOCK_CONTROL_NAME);
ADC_TypeDef *adc = (ADC_TypeDef *)config->base;
LOG_DBG("Initializing....");
data->dev = dev;
#if defined(CONFIG_SOC_SERIES_STM32F0X) || defined(CONFIG_SOC_SERIES_STM32L0X)
/*
* All conversion time for all channels on one ADC instance for F0 and
* L0 series chips has to be the same. This additional variable is for
* checking if the conversion time selection of all channels on one ADC
* instance is the same.
*/
data->acq_time_index = -1;
#endif
if (clock_control_on(clk,
(clock_control_subsys_t *) &config->pclken) != 0) {
return -EIO;
}
#if defined(CONFIG_SOC_SERIES_STM32L4X)
/*
* L4 series STM32 needs to be awaken from deep sleep mode, and restore
* its calibration parameters if there are some previously stored
* calibration parameters.
*/
LL_ADC_DisableDeepPowerDown(adc);
#endif
/*
* F3 and L4 ADC modules need some time to be stabilized before
* performing any enable or calibration actions.
*/
#if defined(CONFIG_SOC_SERIES_STM32F3X) || \
defined(CONFIG_SOC_SERIES_STM32L4X)
LL_ADC_EnableInternalRegulator(adc);
k_busy_wait(LL_ADC_DELAY_INTERNAL_REGUL_STAB_US);
#endif
#if defined(CONFIG_SOC_SERIES_STM32F0X) || \
defined(CONFIG_SOC_SERIES_STM32L0X)
LL_ADC_SetClock(adc, LL_ADC_CLOCK_SYNC_PCLK_DIV4);
#elif defined(CONFIG_SOC_SERIES_STM32F3X) || \
defined(CONFIG_SOC_SERIES_STM32L4X)
LL_ADC_SetCommonClock(__LL_ADC_COMMON_INSTANCE(),
LL_ADC_CLOCK_SYNC_PCLK_DIV4);
#endif
#if !defined(CONFIG_SOC_SERIES_STM32F2X) && \
!defined(CONFIG_SOC_SERIES_STM32F4X) && \
!defined(CONFIG_SOC_SERIES_STM32F7X) && \
!defined(CONFIG_SOC_SERIES_STM32F1X)
/*
* Calibration of F1 series has to be started after ADC Module is
* enabled.
*/
adc_stm32_calib(dev);
#endif
#if defined(CONFIG_SOC_SERIES_STM32F0X) || \
defined(CONFIG_SOC_SERIES_STM32L0X)
if (LL_ADC_IsActiveFlag_ADRDY(adc)) {
LL_ADC_ClearFlag_ADRDY(adc);
}
/*
* These two series STM32 has one internal voltage reference source
* to be enabled.
*/
LL_ADC_SetCommonPathInternalCh(ADC, LL_ADC_PATH_INTERNAL_VREFINT);
#endif
#if defined(CONFIG_SOC_SERIES_STM32F0X) || \
defined(CONFIG_SOC_SERIES_STM32F3X) || \
defined(CONFIG_SOC_SERIES_STM32L0X) || \
defined(CONFIG_SOC_SERIES_STM32L4X)
/*
* ADC modules on these series have to wait for some cycles to be
* enabled.
*/
u32_t adc_rate, wait_cycles;
if (clock_control_get_rate(clk,
(clock_control_subsys_t *) &config->pclken, &adc_rate) < 0) {
LOG_ERR("ADC clock rate get error.");
}
wait_cycles = CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC / adc_rate *
LL_ADC_DELAY_CALIB_ENABLE_ADC_CYCLES;
for (int i = wait_cycles; i >= 0; i--)
;
#endif
LL_ADC_Enable(adc);
#ifdef CONFIG_SOC_SERIES_STM32L4X
/*
* Enabling ADC modules in L4 series may fail if they are still not
* stabilized, this will wait for a short time to ensure ADC modules
* are properly enabled.
*/
u32_t countTimeout = 0;
while (LL_ADC_IsActiveFlag_ADRDY(adc) == 0) {
if (LL_ADC_IsEnabled(adc) == 0UL) {
LL_ADC_Enable(adc);
countTimeout++;
if (countTimeout == 10) {
return -ETIMEDOUT;
}
}
}
#endif
config->irq_cfg_func();
#ifdef CONFIG_SOC_SERIES_STM32F1X
/* Calibration of F1 must starts after two cycles after ADON is set. */
LL_ADC_StartCalibration(adc);
LL_ADC_REG_SetTriggerSource(adc, LL_ADC_REG_TRIG_SOFTWARE);
#endif
adc_context_unlock_unconditionally(&data->ctx);
return 0;
}