delete old cse7759 counter code
parent
6489e78cdc
commit
26ac421d40
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#include <freq_counter.h>
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void freq_counter_init ( struct freq_counter *f, uint32_t cycle_len ) {
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f->input_initialized = false;
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f->input_state = false;
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f->counter = 0;
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f->samples = 0;
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f->cycle_len = cycle_len;
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f->new_measurement = false;
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f->measurement = 0;
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}
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void IRAM_ATTR freq_counter_update ( struct freq_counter *f, bool input ) {
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if ( f->input_initialized == false ) {
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// ignore first input value
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f->input_state = input;
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f->input_initialized = true;
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}
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if ( f->input_state != input) {
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f->counter += 1;
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f->input_state = input;
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}
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f->samples += 1;
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if ( f->samples >= f->cycle_len ) {
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/* cycle complete */
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f->measurement = f->counter;
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f->new_measurement = true;
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f->samples = 0;
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f->counter = 0;
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}
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}
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bool freq_counter_get_measurement( struct freq_counter *f, uint32_t *measurement) {
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if ( f->new_measurement == true ) {
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*measurement = f->measurement;
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f->new_measurement = false;
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return true;
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} else {
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return false;
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}
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}
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@ -1,42 +0,0 @@
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#include <stdbool.h>
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#include <stdint.h>
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#ifndef FREQ_COUNTER_H
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#define FREQ_COUNTER_H
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#ifndef IRAM_ATTR
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#define IRAM_ATTR __attribute__((section(".iram.text")))
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#endif
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struct freq_counter {
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bool input_initialized; /* false before first update call */
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bool input_state; /* last update input state */
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uint32_t counter; /* input state changes counter */
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uint32_t samples; /* input samples counter */
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uint32_t cycle_len; /* number of samples in one cycle */
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bool new_measurement; /* set to true after updating measurement */
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uint32_t measurement; /* number of state changes in last complete cycle */
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};
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/**
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* @brief initialize frequency counter structure
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*
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* @param cycle_len number of samples in one measurement cycle
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*/
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void freq_counter_init ( struct freq_counter *f, uint32_t cycle_len );
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void IRAM_ATTR freq_counter_update ( struct freq_counter *f, bool input );
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/**
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* @brief get new measurement from freq_counter
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*
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* this function should be called at least twice per cycle in order to avoid
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* concurrent rw acces to measurement variable
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* @param measurement is set to new measurement value if returned true
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* @return true if new measurement is available
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*/
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bool freq_counter_get_measurement( struct freq_counter *f, uint32_t *measurement);
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#endif /* end of include guard: FREQ_COUNTER_H */
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