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Only read positive voltages in adc.c

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The ADC sometimes responds with negative voltages read on the ADC input due to noise. This can lead to very high illuminance readings at night (4095 << 4 to be exact due to two's complement :) ).
This commit caps ADC readings at 0.
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Jan-Henrik Bruhn 2024-02-14 11:59:14 +01:00 • committed by GitHub
parent dd373ea235
commit 905978e8c9
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code/nrf-connect/prstlib/src/adc.c
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@ -108,6 +108,7 @@ static int read_adc_spec(const struct adc_dt_spec* spec, prst_adc_read_t* out) {
int32_t val_mv = buf; int32_t val_mv = buf;
RET_IF_ERR(adc_raw_to_millivolts_dt(spec, &val_mv)); RET_IF_ERR(adc_raw_to_millivolts_dt(spec, &val_mv));
val_mv = MAX(0, val_mv);
out->raw = buf; out->raw = buf;
out->millivolts = val_mv; out->millivolts = val_mv;