tms320f2812串口发送数据的代码

以下是基于TMS320F2812的串口发送数据的代码示例：

#include "DSP281x_Device.h"
#include "DSP281x_Examples.h"

void InitSciaGpio()
{
    EALLOW;
    GpioCtrlRegs.GPAMUX2.bit.GPIO19 = 1;
    GpioCtrlRegs.GPAMUX2.bit.GPIO18 = 1;
    GpioCtrlRegs.GPADIR.bit.GPIO19 = 1;
    GpioCtrlRegs.GPADIR.bit.GPIO18 = 0;
    EDIS;
}

void InitScia(int baudrate)
{
    int sciaClk = 150000000;    // 150 MHz
    int divisor = (int)(sciaClk / (baudrate * 8.0)) - 1;
    
    SciaRegs.SCICCR.all = 0x0007;       // 1 stop bit,  No loopback, No parity, 8 char bits, async mode, idle-line protocol
    SciaRegs.SCICTL1.all = 0x0003;      // enable TX, RX, internal SCICLK, Disable RX ERR, SLEEP, TXWAKE
    SciaRegs.SCICTL2.bit.TXINTENA = 0;  // disable TX interrupt
    SciaRegs.SCICTL2.bit.RXBKINTENA = 0;// disable RXBK interrupt
    SciaRegs.SCIHBAUD = (divisor >> 8) & 0xFF;  // high byte of divisor
    SciaRegs.SCILBAUD = divisor & 0xFF;         // low byte of divisor
    SciaRegs.SCICCR.bit.LOOPBKENA = 0;  // disable loopback
    SciaRegs.SCIFFTX.all = 0xC022;     // enable FIFO, TX FIFO interrupt when 2 words are present
    SciaRegs.SCIFFRX.all = 0x0022;     // enable FIFO, RX FIFO interrupt when 2 words are present
    SciaRegs.SCICTL1.all = 0x0023;     // Relinquish SCI from Reset
}

void scia_fifo_init() 
{
    // Clear the FIFO
    SciaRegs.SCIFFTX.bit.TXFIFOXRESET = 1;
    SciaRegs.SCIFFTX.bit.TXFIFOXRESET = 0;

    SciaRegs.SCIFFTX.bit.TXFFIENA = 0;  // disable TX FIFO interrupt
    SciaRegs.SCIFFTX.bit.SCIFFENA = 1;  // enable FIFO

    SciaRegs.SCIFFRX.bit.RXFIFORESET = 1;
    SciaRegs.SCIFFRX.bit.RXFIFORESET = 0;

    SciaRegs.SCIFFRX.bit.RXFFIENA = 0;  // disable RX FIFO interrupt
    SciaRegs.SCIFFRX.bit.RXFFIL = 0x4;  // set RX FIFO interrupt level to 4
}

void scia_xmit(int a) 
{
    while (SciaRegs.SCIFFTX.bit.TXFFST != 0) {};  // Wait for space in FIFO
    SciaRegs.SCITXBUF = a;
}

void scia_msg(char *msg) 
{
    int i;
    i = 0;
    while (msg[i] != '\0') 
    {
        scia_xmit(msg[i]);
        i++;
    }
}

void main(void)
{
    InitSysCtrl();
    DINT;
    InitPieCtrl();
    IER = 0x0000;
    IFR = 0x0000;
    InitSciaGpio();
    InitScia(115200);
    scia_fifo_init();
    scia_msg("Hello World\r\n");
    while (1) {};
}

该示例使用 SCI_A 模块进行串口数据发送，使用了 FIFO 缓冲区来提高发送效率。在 main 函数中，调用了 scia_msg 函数发送字符串 "Hello World"。注意，串口发送的波特率需要与外部设备的波特率匹配。