mhu/reflow-oven-control-sw
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Issue #24: Implement new handling for Unstable flag.

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* Unstable flag will now be set, whenever the output of the moving average filter
  differs more than 10 Ohms from the measured prefilterd input.
This commit is contained in:
Mario Hüttel 2021-01-26 21:46:44 +01:00
parent 67b079fe33
commit 20a65fd7f9
2 changed files with 17 additions and 16 deletions
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22
stm-firmware/adc-meas.c
View File

@ -45,7 +45,6 @@ static float IN_SECTION(.ccm.bss) filter_alpha;
static volatile float IN_SECTION(.ccm.bss) pt1000_res_raw_lf; static volatile float IN_SECTION(.ccm.bss) pt1000_res_raw_lf;
static volatile int * volatile streaming_flag_ptr; static volatile int * volatile streaming_flag_ptr;
static uint32_t IN_SECTION(.ccm.bss) filter_startup_cnt;
static volatile float IN_SECTION(.ccm.bss) adc_pt1000_raw_reading_hf; static volatile float IN_SECTION(.ccm.bss) adc_pt1000_raw_reading_hf;
static volatile uint16_t dma_sample_buffer[ADC_PT1000_DMA_AVG_SAMPLES]; static volatile uint16_t dma_sample_buffer[ADC_PT1000_DMA_AVG_SAMPLES];
static volatile uint32_t IN_SECTION(.ccm.bss) adc_watchdog_counter; static volatile uint32_t IN_SECTION(.ccm.bss) adc_watchdog_counter;
@ -188,7 +187,6 @@ void adc_pt1000_set_moving_average_filter_param(float alpha)
{ {
filter_alpha = alpha; filter_alpha = alpha;
safety_controller_report_error_with_key(ERR_FLAG_MEAS_ADC_UNSTABLE, MEAS_ADC_SAFETY_FLAG_KEY); safety_controller_report_error_with_key(ERR_FLAG_MEAS_ADC_UNSTABLE, MEAS_ADC_SAFETY_FLAG_KEY);
filter_startup_cnt = ADC_FILTER_STARTUP_CYCLES;
} }
void adc_pt1000_set_resistance_calibration(float offset, float sensitivity_deviation, bool active) void adc_pt1000_set_resistance_calibration(float offset, float sensitivity_deviation, bool active)
@ -305,18 +303,22 @@ static inline __attribute__((optimize("O3"))) void adc_pt1000_filter(float adc_p
{ {
float alpha; float alpha;
float res; float res;
static uint8_t old_state = 0;
if (filter_startup_cnt > 0) {
filter_startup_cnt--;
if (filter_startup_cnt == 0)
safety_controller_ack_flag_with_key(ERR_FLAG_MEAS_ADC_UNSTABLE, MEAS_ADC_SAFETY_FLAG_KEY);
}
res = ADC_TO_RES(adc_prefiltered_value); res = ADC_TO_RES(adc_prefiltered_value);
if (ABS(res - pt1000_res_raw_lf) > 20) if (ABS(res - pt1000_res_raw_lf) >= ADC_PT1000_FILTER_UNSTABLE_DIFF) {
alpha = ADC_PT1000_FILTER_WEIGHT_FAST; alpha = ADC_PT1000_FILTER_WEIGHT_FAST;
else if (old_state != 1) {
safety_controller_report_error_with_key(ERR_FLAG_MEAS_ADC_UNSTABLE, MEAS_ADC_SAFETY_FLAG_KEY);
old_state = 1;
}
} else {
alpha = filter_alpha; alpha = filter_alpha;
if (old_state != 2) {
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 + pt1000_res_raw_lf = (1.0f - alpha) * pt1000_res_raw_lf +
alpha * res; alpha * res;

11
stm-firmware/include/reflow-controller/adc-meas.h
View File

@ -44,6 +44,11 @@
*/ */
#define ADC_PT1000_FILTER_WEIGHT_FAST 0.05 #define ADC_PT1000_FILTER_WEIGHT_FAST 0.05
/**
* @brief Difference in Ohm between filter input and output that determines if the filter is stable or unstable.
*/
#define ADC_PT1000_FILTER_UNSTABLE_DIFF 10
/** /**
* @brief ADC channel number of PT1000 sensor input * @brief ADC channel number of PT1000 sensor input
*/ */
@ -64,12 +69,6 @@
*/ */
#define ADC_PT1000_PIN 2U #define ADC_PT1000_PIN 2U
/**
* @brief The cycle count the moving average filter is labeled 'instable' after startup of the measurement or changing
* the alpha value @ref ADC_PT1000_FILTER_WEIGHT
*/
#define ADC_FILTER_STARTUP_CYCLES 800U
/** /**
* @brief The delay value programmed into the sample timer * @brief The delay value programmed into the sample timer
*/ */