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drivers: sensor: stm32 Vref sensor calibration on 12bit

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The Calibration value of the VRef on stm32U5 is acquired on 14Bit by ADC1
and should be adjusted on 12bit becasue the resolution is 12bit
in this stm32_vref driver.

Signed-off-by: Francois Ramu <francois.ramu@st.com>
This commit is contained in:
Francois Ramu 2023-08-10 15:08:17 +02:00 • committed by Carles Cufí
commit 4e070a0867
1 changed files with 9 additions and 0 deletions
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9
drivers/sensor/stm32_vref/stm32_vref.c
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@ -86,7 +86,16 @@ 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 */
/* millivolt to volt */
vref /= 1000;