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Fix devicetree-coeffs bug

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This commit is contained in:
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/boards/arm/bparasite_nrf52840/bparasite_nrf52840.dts
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@ -42,8 +42,8 @@
soil_calibration_coeffs: soil_calibration_coeffs {
compatible = "soil-calibration-coeffs";
dry = <306000 101000 (-11700)>;
wet = <19000 (-4980) 3420>;
dry = <306000 101000 (-11700)>;
wet = <19000 (-4980) 3420>;
};
ctrl {

4
code/nrf-connect/prstlib/dts/bindings/soil-calibration-coeffs.yaml
View file

@ -7,10 +7,10 @@ description: >
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
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.
compatible: soil-calibration-coeffe
compatible: soil-calibration-coeffs
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 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",
100.0f * percent2, raw_adc_output, x, dry2, wet2);