[参考译文] TMS320F28335：使用 DB9引脚连接器(使用 TTL 转换器)在 TMS320F28335器件和外部器件之间进行 SCI 通信、从而通过 LabView 工具进行 RS232通信。

/*
 * SCI.c
 *
 *  Created on: Aug 27, 2024
 *      Author: CG00844381
 */
#include "Mcu1_Device.h"
#include "SCI.h"
#include "stdio.h"
#include "stdlib.h"
#include "string.h"

UNS8 receivedData[4] = { 0 };
UNS16 rx_loop = 0;



void main()
{
	/* Initialize system */
    InitSysCtrl();
    EALLOW;
    SysCtrlRegs.HISPCP.all = 0x3;
    EDIS;

    DINT;
    //disabliling cpu interrupts
    /* Initialize the PIE control registers to their default state */
    InitPieCtrl();

    IER = 0x0000;
     IFR = 0x0000;

    /* Initialize the PIE vector table with pointers to the shell Interrupt Service Routines (ISR). */
    InitPieVectTable();
    IER |= M_INT1;                          // here Enabling CPU INT9
    EINT; //disable
//    // Enabling  interrupt
    ERTM;
	
	for(rx_loop=0;rx_loop<=4;rx_loop++) 
        {
          Sci_rx();
          ScibRegs.SCIFFRX.bit.RXFIFORESET = 0;

          Sci_tx();
		}
	
}


void Sci_Config()
{

    EALLOW;
    SysCtrlRegs.PCLKCR0.bit.SCIBENCLK = 1;     // enabiling peripheral clock
    EDIS;

    EALLOW;
    GpioCtrlRegs.GPAPUD.bit.GPIO18 = 0;
    GpioCtrlRegs.GPAPUD.bit.GPIO19 = 0;
    EDIS;

    ScibRegs.SCICCR.all = 0x0007; // sci control reg are set as 8-bit data, no parity, 1 stop bit
                                  //0000 0000 0000 0111
    ScibRegs.SCICTL1.all = 0x0063; // Enabling TX and RX   reset     
    ScibRegs.SCICTL2.all = 0x0000;             

    ScibRegs.SCIHBAUD = 0x0000;    // Setting the baud rate (high register)
    ScibRegs.SCILBAUD = 0x0079;      //Setting baud rate (low register) 38.46kHz
    
    ScibRegs.SCIFFTX.all = 0x0000;   
    ScibRegs.SCIFFRX.all = 0x0000;    

    ScibRegs.SCIFFTX.all = 0xE044;   //Try E044
    ScibRegs.SCIFFRX.all = 0x0064;   //Try 0064   //to check fifo status change 4 to 10

    ScibRegs.SCIFFCT.all = 0x0000;
    ScibRegs.SCIPRI.bit.FREE = 1; 

    /* Configure SCI Priority register for SOFT bit */
    ScibRegs.SCIPRI.bit.SOFT = 1;

    EALLOW;
    GpioCtrlRegs.GPAQSEL2.bit.GPIO19 = 3;     // Asynchronous input    (SCIRXDA)
    GpioCtrlRegs.GPAMUX2.bit.GPIO18 = 2; //config gpio as SCITXDA   Same in 28069
    GpioCtrlRegs.GPAMUX2.bit.GPIO19 = 2;           //config gpioas SCIRXDA
    EDIS;
  
    //Peripheral intialization
    PieCtrlRegs.PIECTRL.bit.ENPIE = 1;   // Enable the PIE block
    PieCtrlRegs.PIEIER9.bit.INTx3 = 1; // here Enabling SCI RX interrupt in PIE group 9
    PieCtrlRegs.PIEIER9.bit.INTx4 = 1; // here Enabling SCI TX interrupt in PIE group 9
    EDIS;

}


BOOL Sci_rx()
{

    UNS16 Rx_sts;
    UNS16 Rx_rdy = 0x0040;
    do
    {
        Rx_sts = ScibRegs.SCIRXST.all;
    }
    while ((Rx_sts & Rx_rdy) == 0);

    receivedData[rx_loop] = ScibRegs.SCIRXEMU;
    ScibRegs.SCIFFRX.bit.RXFIFORESET = 1;
    printf("rx :0x%x\n",receivedData[rx_loop]);
    
}


BOOL Sci_tx()
{


    while (ScibRegs.SCICTL2.bit.TXRDY == 0);
    {
        ScibRegs.SCITXBUF = receivedData[rx_loop];

         printf("tx : 0x%X\n", ScibRegs.SCITXBUF);
    }
}