tms570ls3137开发板sci串口发送数据，在terminal没有收到

我要测SCI模块，不测SCI/LIN模块，我把例程改为SCI driver配置，main函数里的#define UART scilinREG
改为#define UART sciREG，其他不变，但是在ccs的terminal里没有收到数据。

请您参考下面的程序

unsigned char receive_command[4];

unsigned int Task_Number;

void main()
{
         /** - Initialize SCI Routines to receive Command and transmit data */
         sciInit();

/** - Configure SCI to receive 8 bytes of Command information */
sciReceive(sciREG1, 4, receive_command);

/** - Clear the Task Number */
Task_Number = 0;

while(1)
{


switch(Task_Number)
{
   case 1:
      Task_Number = 0;
       break;

   case 2:
      Task_Number = 0;
      break;

   case 3:
      Task_Number = 0;
      break;
}

}

}


/* The command starts with "*" and ends with "!". For example *02!
* */
void sciNotification(sciBASE_t *sci, unsigned flags)
{

/** Check for the Valid Command
* * - Starter
* ! - End of Command
*/
if(receive_command[0] == '*' && receive_command[3] == '!')
{
        /** - 2nd and 3rd byte received are Task Number,
        * combine them to form one decimal Number */
        Task_Number = (unsigned int)(((receive_command[1] - 48) * 10) + (receive_command[2] - 48));

/** - Get ready to receive the next Command */
sciReceive (sciREG1, 4, receive_command);

/** - Acknowledge once the Valid Command is received */
sciSend (sciREG1, 11, (unsigned char *) "*VALID CMD!");

}else

{

/** - Get ready to receive the next Command */
sciReceive (sciREG1, 4, receive_command);
/** - Acknowledge once the InValid Command is received */
sciSend (sciREG1, 10, (unsigned char *) "Wrong CMD!");

}


}

这是sci接收数据的示例吗？我需要sci发送字节数据的示例，终端是接收端。