ppm.h

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#ifndef RCBENCH_PPM_H
#define RCBENCH_PPM_H
 
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
 
#ifdef __cplusplus
extern "C" {
#endif

#define PPM_MAX_CHANNELS   8u

#define PPM_MAX_RUNS       ((PPM_MAX_CHANNELS + 1u) * 2u)

#define PPM_CHANNEL_MIN_US       400u
#define PPM_CHANNEL_MAX_US      2500u
 
#define PPM_DEFAULT_MARK_US      300u
#define PPM_DEFAULT_FRAME_US   22500u

#define PPM_SYNC_MIN_US         3000u
 
typedef struct {
    uint16_t mark_us;       
    uint16_t frame_us;      
    uint16_t sync_min_us;   
} ppm_cfg_t;
 
#define PPM_CFG_DEFAULT()               \
    (ppm_cfg_t) {                       \
        .mark_us     = PPM_DEFAULT_MARK_US,  \
        .frame_us    = PPM_DEFAULT_FRAME_US, \
        .sync_min_us = PPM_SYNC_MIN_US,      \
    }

size_t ppm_frame(const uint16_t *channel_us, uint8_t channels,
                 const ppm_cfg_t *cfg, uint16_t *runs, size_t max_runs);

uint32_t ppm_min_frame_us(uint8_t channels, const ppm_cfg_t *cfg);
 
#ifdef __cplusplus
}
#endif
 
#endif /* RCBENCH_PPM_H */