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drivers: sensor: stm32_vref: take calibration resolution into account

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Update the driver to take the "vrefint-cal-resolution" property into
account when performing the calculations.

Signed-off-by: Mathieu Choplain <mathieu.choplain@st.com>
This commit is contained in:
Mathieu Choplain 2025-01-02 11:23:27 +01:00 committed by Benjamin Cabé
parent 1d4c5eee6e
commit d173737479
1 changed files with 11 additions and 11 deletions
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22
drivers/sensor/st/stm32_vref/stm32_vref.c
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@ -19,6 +19,9 @@
LOG_MODULE_REGISTER(stm32_vref, CONFIG_SENSOR_LOG_LEVEL);
/* Resolution used to perform the Vref measurement */
#define MEAS_RES (12U)
struct stm32_vref_data {
const struct device *adc;
const struct adc_channel_cfg adc_cfg;
@ -32,6 +35,7 @@ struct stm32_vref_data {
struct stm32_vref_config {
uint16_t *cal_addr;
int cal_mv;
uint8_t cal_shift;
};
static int stm32_vref_sample_fetch(const struct device *dev, enum sensor_channel chan)
@ -103,16 +107,7 @@ static int stm32_vref_channel_get(const struct device *dev, enum sensor_channel
#endif /* CONFIG_SOC_SERIES_STM32H5X */
/* Calculate VREF+ using VREFINT bandgap voltage and calibration data */
#if defined(CONFIG_SOC_SERIES_STM32U5X)
/*
* The VREF CALIBRATION value is acquired on 14 bits
* and the data acquired is on 12 bits
* since the adc_sequence.resolution is 12
*/
vref = (cfg->cal_mv * (*cfg->cal_addr) >> 2) / data->raw;
#else
vref = cfg->cal_mv * (*cfg->cal_addr) / data->raw;
#endif /* CONFIG_SOC_SERIES_STM32H5X */
vref = (cfg->cal_mv * ((*cfg->cal_addr) >> cfg->cal_shift)) / data->raw;
#if defined(CONFIG_SOC_SERIES_STM32H5X)
LL_ICACHE_Enable();
@ -142,7 +137,7 @@ static int stm32_vref_init(const struct device *dev)
.channels = BIT(data->adc_cfg.channel_id),
.buffer = &data->sample_buffer,
.buffer_size = sizeof(data->sample_buffer),
.resolution = 12U,
.resolution = MEAS_RES,
};
return 0;
@ -178,8 +173,13 @@ static struct stm32_vref_data stm32_vref_dev_data = {
static const struct stm32_vref_config stm32_vref_dev_config = {
.cal_addr = (uint16_t *)DT_INST_PROP(0, vrefint_cal_addr),
.cal_mv = DT_INST_PROP(0, vrefint_cal_mv),
.cal_shift = (DT_INST_PROP(0, vrefint_cal_resolution) - MEAS_RES),
};
/* Make sure no series with unsupported configuration can be added silently */
BUILD_ASSERT(DT_INST_PROP(0, vrefint_cal_resolution) >= MEAS_RES,
"VREFINT calibration resolution is too low");
SENSOR_DEVICE_DT_INST_DEFINE(0, stm32_vref_init, NULL, &stm32_vref_dev_data, &stm32_vref_dev_config,
POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY, &stm32_vref_driver_api);