Subversion Repositories oms8051mini

/*

 * UART Software Loop Back.

 * Software continously check the Uart Rx Buffer, If the RX Buffer is not zero,

 * Then it read the Rx data and copy the information back to tx fifo

 */

/*---------------------------------------------------------------------------*/

#include <8051.h>

char cErrCnt;

/*---------------------------------------------------------------------------*/

__xdata __at (0x9000) unsigned char uart_reg0;

__xdata __at (0x9001) unsigned char uart_reg1;

__xdata __at (0x9002) unsigned char uart_reg2;

__xdata __at (0x9003) unsigned char uart_reg3;

__xdata __at (0x9004) unsigned char uart_reg4;

__xdata __at (0x9005) unsigned char uart_tdata;

__xdata __at (0x9006) unsigned char uart_rdata;

__xdata unsigned long *rx_des_base;

__xdata unsigned long *tx_des_base;

void main() {

    unsigned int cFrameCnt = 0;

    /***

     [4:3] = 0 -> No Parity

     [2]   = 1 - 2 Stop

     [1]   = 1 - Rx Enable

     [0]   = 1 - Tx Enable

    **/

    uart_reg0 = 0x7;

    uart_reg2 = 0x0; // Baud Clock

    uart_reg3 = 0x0; // Baud Clock

    while(1) {

       if((uart_reg4 & 0x2) == 0) { // Check the Rx Fifo  Counter

          // Read the Receive FIFO

          uart_tdata = uart_rdata;

          cFrameCnt  = cFrameCnt+1;

         }

    }

}