[Blog] - Giao tiep theo frame

initRxDataPackage.c

/*--------------------------------------------------------------------------------
Function: InitRxDataPackage
Purpose: Init Rx Data Package
Parameters: RX_STATE state
Return: NULL
--------------------------------------------------------------------------------*/
VOID InitRxDataPackage()
{
    RegisterUartCallback(UART_DATA_EVENT, CollectingDataPackage);
}

/*--------------------------------------------------------------------------------
Function: CollectingDataPackage
Purpose: Collecting Data package and store in a buffer
Parameters: PVOID buff
Return: NULL
--------------------------------------------------------------------------------*/

VOID CollectingDataPackage(PVOID rxBuff)
{
    PBYTE pRxBuff = (PBYTE)rxBuff;
    switch(state)
    {
        case WAIT_START_BYTE:
        {
            lastRxData = '';
            nIndex = 0;
            
            if(*pRxBuff == START_BYTE)
            {
                DataPackageRX.data[nIndex++] = START_BYTE;
                lastRxData = *pRxBuff;
                state = IN_MESG;
            }
            
            break;

        }
        case IN_MESG:
        {
            if(*pRxBuff == STOP_BYTE && lastRxData != ESC_BYTE)
            {
                state = STOP;
                break;
            }
            if(*pRxBuff == START_BYTE && lastRxData != ESC_BYTE)
            {
                // Restart frame data.
                nIndex = 0;
                DataPackageRX.data[nIndex++] = *pRxBuff;
                lastRxData = *pRxBuff;
                break;
            }

            DataPackageRX.data[nIndex++] = *pRxBuff;
            lastRxData = *pRxBuff;
            break;

        }
        case STOP:
        {
            DataPackageRX.data[nIndex++] = STOP_BYTE;
            DataPackageRX.data[nIndex] = '';
            DataPackageRX.length = nIndex;
            //WriteUart(DataPackageRX.data, nIndex);

            // Set flag to process frame data
            g_flagFrameReceived = 1;

            state = WAIT_START_BYTE;
            break;
        }

    }
}