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Issue #24: Make UNSTABLE flag only go away, if the PT1000 value stays within the stable region for a given amount of samples

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This commit is contained in:
Mario Hüttel 2021-01-26 21:59:41 +01:00
parent 20a65fd7f9
commit 4c1797aa24
2 changed files with 14 additions and 3 deletions
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5
stm-firmware/adc-meas.c
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@ -304,9 +304,11 @@ static inline __attribute__((optimize("O3"))) void adc_pt1000_filter(float adc_p
float alpha;
float res;
static uint8_t old_state = 0;
static uint32_t stable_sample_counter = 0;
res = ADC_TO_RES(adc_prefiltered_value);
if (ABS(res - pt1000_res_raw_lf) >= ADC_PT1000_FILTER_UNSTABLE_DIFF) {
stable_sample_counter = 0;
alpha = ADC_PT1000_FILTER_WEIGHT_FAST;
if (old_state != 1) {
safety_controller_report_error_with_key(ERR_FLAG_MEAS_ADC_UNSTABLE, MEAS_ADC_SAFETY_FLAG_KEY);
@ -315,10 +317,13 @@ static inline __attribute__((optimize("O3"))) void adc_pt1000_filter(float adc_p
} else {
alpha = filter_alpha;
if (old_state != 2) {
stable_sample_counter++;
if (stable_sample_counter >= ADC_PT1000_FILTER_STABLE_SAMPLE_COUNT) {
safety_controller_ack_flag_with_key(ERR_FLAG_MEAS_ADC_UNSTABLE, MEAS_ADC_SAFETY_FLAG_KEY);
old_state = 2;
}
}
}
pt1000_res_raw_lf = (1.0f - alpha) * pt1000_res_raw_lf +
alpha * res;

6
stm-firmware/include/reflow-controller/adc-meas.h
View File

@ -49,6 +49,12 @@
*/
#define ADC_PT1000_FILTER_UNSTABLE_DIFF 10
/**
* @brief Sample count, the moving average filter has to be within @ref ADC_PT1000_FILTER_UNSTABLE_DIFF for the filter
* to be considered stable
*/
#define ADC_PT1000_FILTER_STABLE_SAMPLE_COUNT 200
/**
* @brief ADC channel number of PT1000 sensor input
*/