diff options
| -rw-r--r-- | driver/charger/bq25710.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/driver/charger/bq25710.c b/driver/charger/bq25710.c index c9724b7d4c..6ace672da3 100644 --- a/driver/charger/bq25710.c +++ b/driver/charger/bq25710.c @@ -324,9 +324,13 @@ int charger_get_vbus_voltage(int port) if (rv) goto error; - /* LSB => 64mV */ - return (reg >> BQ25710_ADC_VBUS_STEP_BIT_OFFSET) * - BQ25710_ADC_VBUS_STEP_MV + BQ25710_ADC_VBUS_BASE_MV; + reg >>= BQ25710_ADC_VBUS_STEP_BIT_OFFSET; + /* + * LSB => 64mV. + * Return 0 when VBUS <= 3.2V as ADC can't measure it. + */ + return reg ? + (reg * BQ25710_ADC_VBUS_STEP_MV + BQ25710_ADC_VBUS_BASE_MV) : 0; error: CPRINTF("Could not read VBUS ADC! Error: %d\n", rv); |