kst_line.h

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#ifndef KST_LINE_H
#define KST_LINE_H
 
#include <stdbool.h>
#include <stdint.h>
 
#include "kst_pio.h"
#include "kst_session.h"
 
#ifdef __cplusplus
extern "C" {
#endif

#define KST_LINE_GRACE_US 1000u

typedef enum {
    KST_LINE_OK = 0,     
    KST_LINE_ERR_ARG,    
    KST_LINE_ERR_CLOCK,  
    KST_LINE_ERR_PIO,    
    KST_LINE_ERR_DMA,    
} kst_line_err_t;

typedef struct {
    kst_pio_clock_t clock;
    kst_pio_run_t   run;
    void    *pio;
    uint32_t sm;
    uint32_t offset;
    uint32_t t_start_us;
    int8_t   dma_tx;
    int8_t   dma_rx;
    uint8_t  pin;
    uint8_t  open;
    uint8_t  busy;
    uint32_t tx[KST_PIO_TX_WORDS];
    uint32_t rx[KST_PIO_RX_WORDS];
} kst_line_t;

void kst_line_init(kst_line_t *line);

kst_line_err_t kst_line_open(kst_line_t *line, unsigned pin);

void kst_line_close(kst_line_t *line);

bool kst_line_is_open(const kst_line_t *line);

bool kst_line_busy(const kst_line_t *line);

uint32_t kst_line_half_cell_ns(const kst_line_t *line);

bool kst_line_start(void *ctx, const kst_frame_t *frame, uint32_t window_ns);
bool kst_line_poll(void *ctx, kst_capture_t *out);
uint32_t kst_line_now_us(void *ctx);

kst_driver_t kst_line_driver(kst_line_t *line);
 
#ifdef __cplusplus
}
#endif
 
#endif /* KST_LINE_H */