struct work_dash
{
    uint8_t type;                           // Bit[7:5]: Type,fixed as 0x01. Bit[4]:sno valid   Bit[3:0]:reserved
    uint8_t wc;                             // bit[7]: reserved, bit[6:0]: work count base
    uint8_t work[WORK_DATA_INPUT_LENGTH];   // 0-75 bytes are dash work; 76-79 are start nonce field
    uint16_t crc16;                         // crc, but not include the header 0x55, 0xaa
};
//...

// BM1760 ASIC input data length
#define WORK_INPUT_TYPE_WITH_SNO                    0x30
#define WORK_INPUT_TYPE_WITHOUT_SNO                 0x20

//...

void *DASH_fill_work(void *usrdata)
{
struct work_dash workdata;
//...
workdata.type = WORK_INPUT_TYPE_WITHOUT_SNO;
//...
DASH_write(info->dev_fd[chainid], (uint8_t *)&workdata, WORK_INPUT_LENGTH_WITH_CRC);