#ifndef __YMODEM_H__
#define __YMODEM_H__

#include "board.h"

#ifdef __cplusplus
extern "C" {
#endif

#define YMODEM_FLAG_UNKNOWN     (0x0001u)
#define YMODEM_FLAG_BLK_END     (0x0002u)
#define YMODEM_FLAG_FILE_END    (0x0004u)

#define YMODEM_SOH              (0x01u)
#define YMODEM_STX              (0x02u)
#define YMODEM_EOT              (0x04u)
#define YMODEM_ACK              (0x06u)
#define YMODEM_NAK              (0x15u)
#define YMODEM_CAN              (0x18u)
#define YMODEM_C                (0x43u)

#define YMODEM_LONG_SIZE        (1024)
#define YMODEM_SHORT_SIZE       (128)

#define YMODEM_GOOD_CRC         (0x0000u)

#define YMODEM_BUF_DEPTH        (2048+256)

typedef struct {
    uint8_t     HeadByte;
    uint8_t     BlkSeq;
    uint16_t    Flag;
    uint16_t    CalCRC;
    uint16_t    ByteLeft;
    uint16_t    ByteIdx;
    uint16_t    WrAddr;
    uint16_t    AckAddr;
    uint16_t    RdAddr;
    uint32_t    Fsize;
    uint32_t    MaxSize;
    uint32_t    FlashAddr;
    uint8_t     *Buf;
} ymodem_cntxt_t;

extern ymodem_cntxt_t ymodem_cntxt;
extern uint16_t ymodem_crc(uint8_t byte, uint16_t crc_old);
extern void ymodem_rx_byte(uint8_t RxByte, void *arg);
extern uint16_t ymodem_rx_file(ymodem_cntxt_t *p);
extern uint16_t FIFO_to_MCU_pp(uint8_t last_blk, uint8_t *buf, uint16_t waddr, uint16_t raddr, uint32_t *faddr);

#ifdef __cplusplus
}
#endif

#endif