优化这段代码 if (draw == k+1) { if( k == 0 ) { if (gRunPara.COMMS_SerialInfo[serialid][k].val<8) ++gRunPara.COMMS_SerialInfo[serialid][k].val; change = 1; } else if( k == 1 ) { if (gRunPara.COMMS_SerialInfo[serialid][k].val<9) ++gRunPara.COMMS_SerialInfo[serialid][k].val; change = 1; } else if( k == 2 || k == 7 || k == 18 ) { if (gRunPara.COMMS_SerialInfo[serialid][k].val<2) ++gRunPara.COMMS_SerialInfo[serialid][k].val; change = 1; } else if( k == 6 || k == 8 ) { if (gRunPara.COMMS_SerialInfo[serialid][k].val<2) ++gRunPara.COMMS_SerialInfo[serialid][k].val; change = 1; } else if( k == 3 || k == 13 || k == 14 || k == 16 || k == 20 || k == 21 ) { if (gRunPara.COMMS_SerialInfo[serialid][k].val<1) ++gRunPara.COMMS_SerialInfo[serialid][k].val; change = 1; } else if( k == 15 || k == 17) { if (gRunPara.COMMS_SerialInfo[serialid][k].val<2) ++gRunPara.COMMS_SerialInfo[serialid][k].val; change = 1; } else change = Lcd_Modify_Param(LCD_KEY_ADD,ALTER_SERI,UNIT_PUBLIC_MX6,serialid,k,j); }

You can optimize this code by removing the repeated code blocks and using a switch statement instead of multiple if-else statements. Here's an example:

if (draw == k+1) {
    switch (k) {
        case 0:
            if (gRunPara.COMMS_SerialInfo[serialid][k].val < 8) {
                ++gRunPara.COMMS_SerialInfo[serialid][k].val;
                change = 1;
            }
            break;
        case 1:
            if (gRunPara.COMMS_SerialInfo[serialid][k].val < 9) {
                ++gRunPara.COMMS_SerialInfo[serialid][k].val;
                change = 1;
            }
            break;
        case 2:
        case 7:
        case 18:
            if (gRunPara.COMMS_SerialInfo[serialid][k].val < 2) {
                ++gRunPara.COMMS_SerialInfo[serialid][k].val;
                change = 1;
            }
            break;
        case 3:
        case 13:
        case 14:
        case 16:
        case 20:
        case 21:
            if (gRunPara.COMMS_SerialInfo[serialid][k].val < 1) {
                ++gRunPara.COMMS_SerialInfo[serialid][k].val;
                change = 1;
            }
            break;
        case 6:
        case 8:
            if (gRunPara.COMMS_SerialInfo[serialid][k].val < 2) {
                ++gRunPara.COMMS_SerialInfo[serialid][k].val;
                change = 1;
            }
            break;
        case 15:
        case 17:
            if (gRunPara.COMMS_SerialInfo[serialid][k].val < 2) {
                ++gRunPara.COMMS_SerialInfo[serialid][k].val;
                change = 1;
            }
            break;
        default:
            change = Lcd_Modify_Param(LCD_KEY_ADD, ALTER_SERI, UNIT_PUBLIC_MX6, serialid, k, j);
            break;
    }
}

This code replaces the multiple if-else statements with a switch statement that checks the value of `k` and performs the appropriate action. The repeated code blocks have been removed, and the code is more concise and easier to read.