#ifndef RS_BOOT_TRANSPORT_H
#define RS_BOOT_TRANSPORT_H

/*
 * ProtoCAN RS boot transport for TI C28x.
 * A C28x char is 16 bits, therefore every wire byte is stored in the low
 * eight bits of rsbt_byte_t.  Never use sizeof() as a wire-byte count.
 */
typedef unsigned int  rsbt_byte_t;
typedef unsigned int  rsbt_u16_t;
typedef unsigned long rsbt_u32_t;

#define RSBT_MAX_PAYLOAD 512U
#define RSBT_MAX_FRAME   (8U + RSBT_MAX_PAYLOAD + 4U)
#define RSBT_MAX_BLOCK   (RSBT_MAX_PAYLOAD - 8U)
#define RSBT_FLAG_MIRROR_RAM 0x01U

typedef enum {
    RSBT_IDLE = 0U,
    RSBT_RECEIVING = 1U,
    RSBT_READY = 2U,
    RSBT_FAILED = 3U
} rsbt_state_t;

typedef struct {
    int (*transmit)(void *, const rsbt_byte_t *, rsbt_u16_t);
    int (*erase)(void *, rsbt_u32_t);
    int (*write)(void *, rsbt_u32_t, const rsbt_byte_t *, rsbt_u16_t);
    int (*read)(void *, rsbt_u32_t, rsbt_byte_t *, rsbt_u16_t);
    int (*write_ram)(void *, rsbt_u32_t, const rsbt_byte_t *, rsbt_u16_t);
    int (*image_valid)(void *, rsbt_u32_t, rsbt_u32_t);
    void (*reboot)(void *);
} rsbt_port_t;

typedef struct {
    rsbt_u32_t app_address;
    rsbt_u32_t app_size;
    rsbt_u16_t max_block;
} rsbt_config_t;

typedef struct {
    rsbt_config_t config;
    rsbt_port_t port;
    void *user;
    rsbt_byte_t parser[RSBT_MAX_FRAME];
    rsbt_byte_t tx[RSBT_MAX_FRAME];
    rsbt_byte_t scratch[32];
    rsbt_u16_t parser_length;
    rsbt_u32_t image_size;
    rsbt_u32_t image_crc;
    rsbt_u32_t next_offset;
    rsbt_u32_t crc_errors;
    rsbt_byte_t flags;
    rsbt_state_t state;
} rsbt_t;

int rsbt_init(rsbt_t *, const rsbt_config_t *, const rsbt_port_t *, void *);
void rsbt_feed(rsbt_t *, rsbt_byte_t);
void rsbt_abort(rsbt_t *);
rsbt_u32_t rsbt_crc32(const rsbt_byte_t *, rsbt_u16_t);

#endif