49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
#include <stdbool.h>
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#include <stdint.h>
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#ifndef IMPULS_COUNTER_H
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#define IMPULS_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 impuls_measurement {
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uint32_t samples; /* number of samples */
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uint32_t changes; /* input state changes */
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};
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struct impuls_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; /* minimum number of samples in one cycle */
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bool new_measurement; /* set to true after updating measurement */
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struct impuls_measurement measurement; /* one measurement */
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};
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/**
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* @brief initialize impuls 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 impuls_counter_init ( struct impuls_counter *f, uint32_t cycle_len );
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void IRAM_ATTR impuls_counter_update ( struct impuls_counter *f, bool input );
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/**
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* @brief get new measurement from impuls_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 impuls_counter_get_measurement( struct impuls_counter *f,
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struct impuls_measurement *measurement);
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#endif /* end of include guard: IMPULS_COUNTER_H */
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