michaelh/zephyr
1
0
Fork 0
Code Releases Activity

drivers: sensor: stm32_vbat: get vref-mv through the ADC API

Browse source 
Get the vref-mv through the ADC API instead of the device tree. This
saves 8 bytes of SRAM and will be future proof in case, one day, support
for a variable vref is added.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2022-07-01 20:12:50 +02:00 • committed by Carles Cufí
commit 869c60e208
1 changed files with 2 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

7
drivers/sensor/stm32_vbat/stm32_vbat.c
View file

@ -27,7 +27,6 @@ struct stm32_vbat_data {
};
struct stm32_vbat_config {
uint16_t vref_mv;
int ratio;
};
@ -72,7 +71,8 @@ static int stm32_vbat_channel_get(const struct device *dev, enum sensor_channel
return -ENOTSUP;
}
voltage = data->raw * cfg->vref_mv / 0x0FFF; /* Sensor value in millivolts */
/* Sensor value in millivolts */
voltage = data->raw * adc_ref_internal(data->adc) / 0x0FFF;
/* considering the vbat input through a resistor bridge */
voltage = voltage * cfg->ratio / 1000; /* value of SENSOR_CHAN_VOLTAGE in Volt */
@ -106,10 +106,7 @@ static int stm32_vbat_init(const struct device *dev)
return 0;
}
#define STM32_VBAT DT_PROP(DT_INST_IO_CHANNELS_CTLR(0), vref_mv)
static struct stm32_vbat_config stm32_vbat_dev_config = {
.vref_mv = DT_PROP(DT_INST_IO_CHANNELS_CTLR(0), vref_mv),
.ratio = DT_INST_PROP(0, ratio),
};