Function make_cmd_frame

rigs/icom/frame.c:51–92

* Build a CI-V frame. * The whole frame is placed in frame[], * "re_id" is the transceiver's CI-V address, * "cmd" is the Command number, * "subcmd" is the Sub command number, set to -1 if not present in frame, * if the frame has no data, then the "data" pointer must be NULL, * and data_len==0. * "data_len" holds the Data area length pointed by the "data" pointer. * REM: if "data" is

 *      The smallest frame is 6 bytes, the biggest is at least 13 bytes.
 */
int make_cmd_frame(unsigned char frame[], unsigned char re_id,
                   unsigned char ctrl_id,
                   unsigned char cmd, int subcmd,
                   const unsigned char *data, int data_len)
{
    int i = 0;

#if 0
    frame[i++] = PAD;   /* give old rigs a chance to flush their rx buffers */
#endif
    frame[i++] = PR;    /* Preamble code */
    frame[i++] = PR;
    frame[i++] = re_id;
    frame[i++] = ctrl_id;
    frame[i++] = cmd;

    if (subcmd != -1)
    {
#ifdef MULTIB_SUBCMD
        register int j;

        if ((j = subcmd & 0xff0000))    /* allows multi-byte subcmd for dsp rigs */
        {
            frame[i++] = j >> 16;
            frame[i++] = (subcmd & 0xff00) >> 8;
        }
        else if ((j = subcmd & 0xff00)) { frame[i++] = j >> 8; }

#endif
        frame[i++] = subcmd & 0xff;
    }

    if (data_len != 0)
    {
        memcpy(frame + i, data, data_len);
        i += data_len;
    }

    frame[i++] = FI;        /* EOM code */

    return (i);
}

int icom_frame_fix_preamble(int frame_len, unsigned char *frame)
{