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fix(battery): change nRF52 ADC gain

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With ADC pin, maximum 3.6V input needs gain 1/6 to be less than the 0.6V
reference.

With VDDHDIV5, maximum 6V input corresponds to 1.2V so gain 1/2 will be less
than the 0.6V reference and be slightly more precise.
This commit is contained in:
Xudong Zheng 2023-07-20 16:48:02 -04:00 • committed by Pete Johanson
parent cb9c573b53
commit e65a7e3075
2 changed files with 2 additions and 2 deletions
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2
app/drivers/sensor/battery/battery_nrf_vddh.c
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@ -93,7 +93,7 @@ static int vddh_init(const struct device *dev) {
#ifdef CONFIG_ADC_NRFX_SAADC
drv_data->acc = (struct adc_channel_cfg){
.gain = ADC_GAIN_1_5,
.gain = ADC_GAIN_1_2,
.reference = ADC_REF_INTERNAL,
.acquisition_time = ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 40),
.input_positive = SAADC_CH_PSELN_PSELN_VDDHDIV5,

2
app/drivers/sensor/battery/battery_voltage_divider.c
View file

@ -140,7 +140,7 @@ static int bvd_init(const struct device *dev) {
#ifdef CONFIG_ADC_NRFX_SAADC
drv_data->acc = (struct adc_channel_cfg){
.gain = ADC_GAIN_1_5,
.gain = ADC_GAIN_1_6,
.reference = ADC_REF_INTERNAL,
.acquisition_time = ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 40),
.input_positive = SAADC_CH_PSELP_PSELP_AnalogInput0 + drv_cfg->io_channel.channel,