probe_rs232.c

uCOS-II example for MC9S12DPxxx

/*
*********************************************************************************************************
*                                            ProbeRS232_Task()
*
* Description : The task which parses the received packet, forms a response, and begins transmission.
*
* Argument(s) : p_arg           The argument passed to 'ProbeRS232_Task()' by  'ProbeRS232_OS_Task()'.
*
* Return(s)   : none.
*
* Caller(s)   : ProbeRS232_OS_Task().
*
* Note(s)     : none.
*********************************************************************************************************
*/

#if (PROBE_RS232_PARSE_TASK == DEF_TRUE)
void  ProbeRS232_Task (void *p_arg)
{
    CPU_INT16U  len;


    (void)p_arg;

    while (DEF_TRUE) {
        ProbeRS232_OS_Pend();                                   /* Wait for a packet to be received.                    */

        len = ProbeRS232_ParseRxPkt();                          /* Parse packet and formulate a response.               */

        if (len > 0) {                                          /* If we have a response.                               */
            ProbeRS232_TxLen = len;
            ProbeRS232_TxStart();
        }
    }
}
#endif


/*
*********************************************************************************************************
*********************************************************************************************************
*                                            RX & TX HANDLERS
*********************************************************************************************************
*********************************************************************************************************
*/

/*
*********************************************************************************************************
*                                         ProbeRS232_RxHandler()
*
* Description : Handle a received byte.
*
* Argument(s) : rx_data         Received data byte.
*
* Return(s)   : none.
*
* Caller(s)   : Rx ISR.
*
* Note(s)     : none.
*********************************************************************************************************
*/

void  ProbeRS232_RxHandler (CPU_INT08U rx_data)
{
#if (PROBE_COM_STAT_EN == DEF_ENABLED)
    ProbeRS232_RxCtr++;
#endif

    switch (ProbeRS232_RxState) {
        case PROBE_RS232_RX_STATE_SD0:                          /* Rx'd the start 1st start delimiter (SD0).            */
             if (rx_data == PROBE_RS232_PROTOCOL_RX_SD0) {
                 ProbeRS232_RxState = PROBE_RS232_RX_STATE_SD1;
                 ProbeRS232_RxBufClr();
             }
             break;


        case PROBE_RS232_RX_STATE_SD1:                          /* Rx'd the start 2nd start delimiter (SD1).            */
             if (rx_data == PROBE_RS232_PROTOCOL_RX_SD1) {
                 ProbeRS232_RxState = PROBE_RS232_RX_STATE_SD2;
             } else {
                 ProbeRS232_RxState = PROBE_RS232_RX_STATE_SD0;
             }
             break;


        case PROBE_RS232_RX_STATE_SD2:                          /* Rx'd the start 3rd start delimiter (SD2).            */
             if (rx_data == PROBE_RS232_PROTOCOL_RX_SD2) {
                 ProbeRS232_RxState = PROBE_RS232_RX_STATE_SD3;
             } else {
                 ProbeRS232_RxState = PROBE_RS232_RX_STATE_SD0;
             }
             break;


        case PROBE_RS232_RX_STATE_SD3:                          /* Rx'd the start 4th start delimiter (SD3).            */
             if (rx_data == PROBE_RS232_PROTOCOL_RX_SD3) {
                 ProbeRS232_RxState = PROBE_RS232_RX_STATE_LEN1;
             } else {
                 ProbeRS232_RxState = PROBE_RS232_RX_STATE_SD0;
             }
             break;


        case PROBE_RS232_RX_STATE_LEN1:                         /* Rx'd the 1st len byte.                               */
#if (PROBE_RS232_USE_CHECKSUM == DEF_TRUE)
             ProbeRS232_RxChkSum    = rx_data;
#endif
             ProbeRS232_RxRemainLen = rx_data;
             ProbeRS232_RxState     = PROBE_RS232_RX_STATE_LEN2;
             break;


        case PROBE_RS232_RX_STATE_LEN2:                         /* Rx'd the 2nd len byte.                               */
#if (PROBE_RS232_USE_CHECKSUM == DEF_TRUE)
             ProbeRS232_RxChkSum    += rx_data;
#endif
             ProbeRS232_RxRemainLen |= rx_data << 8;

                                                                /* Chk len.                                             */
             if ((ProbeRS232_RxRemainLen == 0) || (ProbeRS232_RxRemainLen > PROBE_RS232_RX_BUF_SIZE)) {
                 ProbeRS232_RxState  = PROBE_RS232_RX_STATE_SD0;
             } else {
                 ProbeRS232_RxLen    = ProbeRS232_RxRemainLen;
                 ProbeRS232_RxState  = PROBE_RS232_RX_STATE_PAD1;
             }
             break;


        case PROBE_RS232_RX_STATE_PAD1:                         /* Rx'd the 1st padding byte.                           */
             ProbeRS232_RxState = PROBE_RS232_RX_STATE_PAD2;
             break;


        case PROBE_RS232_RX_STATE_PAD2:                         /* Rx'd the 2nd  padding byte.                          */
             ProbeRS232_RxState = PROBE_RS232_RX_STATE_DATA;
             break;


        case PROBE_RS232_RX_STATE_DATA:                         /* Rx'd data.                                           */
             ProbeRS232_RxStoINT8U(rx_data);
#if (PROBE_RS232_USE_CHECKSUM == DEF_TRUE)
             ProbeRS232_RxChkSum += rx_data;
#endif
             if (--ProbeRS232_RxRemainLen == 0) {
                 ProbeRS232_RxState = PROBE_RS232_RX_STATE_CHKSUM;
             }
             break;


        case PROBE_RS232_RX_STATE_CHKSUM:                       /* Rx'd the checksum.                                   */
#if (PROBE_RS232_USE_CHECKSUM == DEF_TRUE)
             ProbeRS232_RxChkSum += rx_data;
             if ((ProbeRS232_RxChkSum & 0xFF) == 0x00) {
                 ProbeRS232_RxState = PROBE_RS232_RX_STATE_ED;
             } else {
                 ProbeRS232_RxState = PROBE_RS232_RX_STATE_SD0;
             }
#else
             ProbeRS232_RxState = PROBE_RS232_RX_STATE_ED;
#endif
             break;


        case PROBE_RS232_RX_STATE_ED:                           /* Rx'd the end delimiter.                              */
             if (rx_data == PROBE_RS232_PROTOCOL_RX_ED) {
                 ProbeRS232_RxPkt();                            /* Parse rx'd pkt.                                      */
             }
             ProbeRS232_RxState = PROBE_RS232_RX_STATE_SD0;
             break;


        default:
             ProbeRS232_RxState = PROBE_RS232_RX_STATE_SD0;
             break;
    }
}


/*
*********************************************************************************************************
*                                         ProbeRS232_TxHandler()
*
* Description : Handle a byte transmission.
*
* Argument(s) : none.
*
* Return(s)   : none.
*
* Caller(s)   : Tx ISR.
*
* Note(s)     : none.
*********************************************************************************************************
*/

void  ProbeRS232_TxHandler (void)
{
    CPU_INT08U  tx_data;


#if (PROBE_COM_STAT_EN == DEF_ENABLED)
    if ((ProbeRS232_TxState != PROBE_RS232_TX_STATE_SD0) ||
        (ProbeRS232_TxLen    > 0                       )) {
        ProbeRS232_TxCtr++;
    }
#endif

    switch (ProbeRS232_TxState) {
        case PROBE_RS232_TX_STATE_SD0:
             if (ProbeRS232_TxLen > 0) {                        /* If pkt is waiting to be sent ...                     */
                 ProbeRS232_Tx1(PROBE_RS232_PROTOCOL_TX_SD0);   /*  ... tx start 1st start delimiter (SD0).             */
                 ProbeRS232_TxActiveFlag = DEF_TRUE;
                 ProbeRS232_TxState      = PROBE_RS232_TX_STATE_SD1;
                 ProbeRS232_TxBufRdIx    = 0;

             } else {                                           /* If no pkt is waiting to be sent ...                  */
                 ProbeRS232_TxActiveFlag = DEF_FALSE;
                 ProbeRS232_TxIntDis();                         /*  ... dis tx int's.                                   */
             }
             break;


        case PROBE_RS232_TX_STATE_SD1:                          /* Tx start 2nd start delimiter (SD1).                  */
             ProbeRS232_Tx1(PROBE_RS232_PROTOCOL_TX_SD1);
             ProbeRS232_TxState = PROBE_RS232_TX_STATE_SD2;
             break;


        case PROBE_RS232_TX_STATE_SD2:                          /* Tx start 3rd start delimiter (SD2).                  */
             ProbeRS232_Tx1(PROBE_RS232_PROTOCOL_TX_SD2);
             ProbeRS232_TxState = PROBE_RS232_TX_STATE_SD3;
             break;


        case PROBE_RS232_TX_STATE_SD3:                          /* Tx start 4th start delimiter (SD3).                  */
             ProbeRS232_Tx1(PROBE_RS232_PROTOCOL_TX_SD3);
             ProbeRS232_TxState = PROBE_RS232_TX_STATE_LEN1;