michaelh/zephyr
1
0
Fork 0
Code Releases Activity

drivers: sensor: stm32_vref: get rid of floating point computation

Browse source 
Instead of using floating point operations to compute the vref voltage,
it is possible to use the sensor_value_from_milli() function.

On a STM32G0, this saves 130 bytes of flash, excluding the FP library
needed on a FPU less MCU.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2024-05-08 17:47:54 +02:00 • committed by Anas Nashif
commit 09fc2dab43
1 changed files with 2 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

6
drivers/sensor/st/stm32_vref/stm32_vref.c
View file

@ -81,7 +81,7 @@ static int stm32_vref_channel_get(const struct device *dev, enum sensor_channel
{
struct stm32_vref_data *data = dev->data;
const struct stm32_vref_config *cfg = dev->config;
float vref;
int32_t vref;
if (chan != SENSOR_CHAN_VOLTAGE) {
return -ENOTSUP;
@ -112,14 +112,12 @@ static int stm32_vref_channel_get(const struct device *dev, enum sensor_channel
#else
vref = cfg->cal_mv * (*cfg->cal_addr) / data->raw;
#endif /* CONFIG_SOC_SERIES_STM32H5X */
/* millivolt to volt */
vref /= 1000;
#if defined(CONFIG_SOC_SERIES_STM32H5X)
LL_ICACHE_Enable();
#endif /* CONFIG_SOC_SERIES_STM32H5X */
return sensor_value_from_double(val, vref);
return sensor_value_from_milli(val, vref);
}
static const struct sensor_driver_api stm32_vref_driver_api = {