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Fix devicetree-coeffs bug

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rbaron 2023-03-19 10:02:26 +01:00
parent 1983f31af9
commit e24530b7c3
3 changed files with 5 additions and 5 deletions
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4
code/nrf-connect/prstlib/dts/bindings/soil-calibration-coeffs.yaml
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@ -7,10 +7,10 @@ description: >
wet: For estimation of the fully dry state, given the battery voltage wet: For estimation of the fully dry state, given the battery voltage
Note that each poly coefficient is specified as 1000 times its real values. This is because we can't Note that each poly coefficient is specified as 1000 times its real values. This is because we can't
directly represent floating points in devicetree. The final evaludated value should be divided by directly represent floating points in devicetree. The final evaluated value should be divided by
1000.0f in code. 1000.0f in code.
compatible: soil-calibration-coeffe compatible: soil-calibration-coeffs
include: base.yaml include: base.yaml

2
code/nrf-connect/prstlib/src/adc.c
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@ -101,7 +101,7 @@ static inline float get_soil_moisture_percent(float battery_voltage,
const float dry2 = eval_poly(dry_coeffs, x); const float dry2 = eval_poly(dry_coeffs, x);
const float wet2 = eval_poly(wet_coeffs, x); const float wet2 = eval_poly(wet_coeffs, x);
const float percent2 = (raw_adc_output - dry) / (wet - dry); const float percent2 = (raw_adc_output - dry2) / (wet2 - dry2);
LOG_INF("Read soil moisture 2: %.2f | Raw %u | Batt: %.2f | Dry: %.2f | Wet: %.2f", LOG_INF("Read soil moisture 2: %.2f | Raw %u | Batt: %.2f | Dry: %.2f | Wet: %.2f",
100.0f * percent2, raw_adc_output, x, dry2, wet2); 100.0f * percent2, raw_adc_output, x, dry2, wet2);