heartbeat.h

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#pragma once
 
#include <stdbool.h>
#include <stdint.h>

#define HEARTBEAT_PERIOD_MS   20u

#define HEARTBEAT_MIN_GAP_MS  4u
#define HEARTBEAT_MAX_GAP_MS  150u

#define HEARTBEAT_GOOD_RUN    4u

#define HEARTBEAT_SETTLE_MS \
    (HEARTBEAT_GOOD_RUN * HEARTBEAT_PERIOD_MS + HEARTBEAT_PERIOD_MS)
 
/* ------------------------------------------------------- the panel's end */
 
typedef struct {
    uint32_t last_ms;   
    bool     level;     
    bool     started;   
} heartbeat_gen_t;

void heartbeat_gen_init(heartbeat_gen_t *g);

bool heartbeat_gen_step(heartbeat_gen_t *g, uint32_t now_ms, bool alive);
 
/* ------------------------------------------------ the IOmcu's end */
 
typedef struct {
    uint32_t last_edge_ms;
    uint32_t good_run;      
    bool     have_edge;     
    bool     alive;
    /* Kept for the status page: a line that is rejected is worth being able
     * to ask about, and "how" narrows a fault far faster than "not alive". */
    uint32_t rejected_fast; 
    uint32_t rejected_slow; 
} heartbeat_mon_t;

void heartbeat_mon_init(heartbeat_mon_t *m);

void heartbeat_mon_edge(heartbeat_mon_t *m, uint32_t now_ms);

bool heartbeat_mon_alive(heartbeat_mon_t *m, uint32_t now_ms);