5、DSP28335 串口发送接收FIFO中断，自定义printf函数

#include "uart.h"

unsigned char data[8];

void MyUartInit(Uint32 baud)
{
    unsigned char scihbaud = 0;
    unsigned char scilbaud = 0;
    Uint16 scibaud = 0;

    EALLOW;
    InitSciaGpio();
    EDIS;

    EALLOW;
    //0：一位停止位；1：两位停止位
    SciaRegs.SCICCR.bit.STOPBITS = 0;
    //0：偶校验；1：奇校验
    SciaRegs.SCICCR.bit.PARITY = 0;
    //0：校验位失能，1：校验位使能
    SciaRegs.SCICCR.bit.PARITYENA = 0;
    //0：回环测试功能失能；1：回环测试功能使能
    SciaRegs.SCICCR.bit.LOOPBKENA = 0;
    //
    SciaRegs.SCICCR.bit.ADDRIDLE_MODE = 0;
    //字长：8位字长
    SciaRegs.SCICCR.bit.SCICHAR = 0x7;
//  SciaRegs.SCICCR.all = 0x0007;

    //该DSP主频为 60MHz，通过LOSPCP寄存器将系统时钟分频为低速时钟
    //在main函数的InitSysCtrl()里面配置了
    //SysCtrlRegs.LOSPCP.all = 0x0002; 4分频 15MHz 串口时钟

    //15M时钟 / (8 * baud) - 1, 分高八位和低八位
    scibaud = 15000000 / (8 * baud) - 1;
    scihbaud = scibaud >> 8;
    scilbaud = scibaud & 0xff;

    //设置波特率
    SciaRegs.SCIHBAUD = scihbaud;   //高8位
    SciaRegs.SCILBAUD = scilbaud;   //低8位

    //发送接收使能，1：使能；0：失能
    SciaRegs.SCICTL1.bit.RXENA = 1;
    SciaRegs.SCICTL1.bit.TXENA = 1;
//  SciaRegs.SCICTL1.all = 0x0003;

    //接收中断使能，这里使用FIFO接收中断，就不用配置
//  SciaRegs.SCICTL2.bit.RXBKINTENA = 1;

    //0：FIFO失能；1：FIFO使能
    SciaRegs.SCIFFTX.bit.SCIFFENA = 1;
    //0：复位SCI接收和发送通道；1：SCI的FIFO恢复发送和接收
    SciaRegs.SCIFFTX.bit.SCIRST = 1;
    //0：失能FIFO发送中断；1：使能FIFO发送中断
    SciaRegs.SCIFFTX.bit.TXFFIENA = 0;
    //设置FIFO发送中断深度
    SciaRegs.SCIFFTX.bit.TXFFIL = 0x00;
    //0：无影响；1：清除TXFFINT标志7位
    SciaRegs.SCIFFTX.bit.TXFFINTCLR = 1;
    //0：重置FIFO指针和保持复位；1：重启发送FIFO操作
    SciaRegs.SCIFFTX.bit.TXFIFOXRESET = 0;

    //0：无影响；1：清除RXFFOVF标志第15位
    SciaRegs.SCIFFRX.bit.RXFFOVRCLR = 1;
    //0：无影响；1：清除RXFFINT标志第7位
    SciaRegs.SCIFFRX.bit.RXFFINTCLR = 1;
    //0：重置FIFO指针和保持复位；1：重启接收FIFO操作
    SciaRegs.SCIFFRX.bit.RXFIFORESET = 0;
    //0：接收FIFO中断失能；1：接收FIFO中断使能
    SciaRegs.SCIFFRX.bit.RXFFIENA = 1;
    //FIFO接收中断深度
    SciaRegs.SCIFFRX.bit.RXFFIL = 0x08;


    SciaRegs.SCIFFCT.all = 0x0000;
    SciaRegs.SCICTL1.all = 0x0023;

    SciaRegs.SCIFFTX.bit.TXFIFOXRESET = 1;
    SciaRegs.SCIFFRX.bit.RXFIFORESET = 1;

    PieVectTable.SCIRXINTA = &SciRxFifoIsr;
    EDIS;

    //使能PIE、CPU中断
    PieCtrlRegs.PIECTRL.bit.ENPIE = 1;
    PieCtrlRegs.PIEIER9.bit.INTx1 = 1;
    IER |= M_INT9;
    EINT;
    ERTM;
}

void UartSendByte(Uint32 a)
{
    while (SciaRegs.SCIFFTX.bit.TXFFST != 0);
    SciaRegs.SCITXBUF = a;
}

void UartSendArray(unsigned char *Array, Uint16 ArrayLength)
{
    Uint16 i;
    for(i = 0; i < ArrayLength; i++)
    {
        UartSendByte(Array[i]);
    }
}

void UartSendString(char *msg)
{
    Uint32 i = 0;
    while(msg[i] != '\0')
    {
        UartSendByte(msg[i]);
        i++;
    }
}

void uart_printf(char * fmt, ...) //自定义变参函数
{
    char *  arg_ptr;
    unsigned int  i ,  len;
    static char write_buf[MAX_WRITE_LEN];

    va_start(arg_ptr, fmt);
    len = vsprintf((char *)write_buf, fmt, arg_ptr);
    va_end(arg_ptr);

    for (i = 0; i < len; i++)
    {
        if ( '\0' != write_buf[i] )
        {
            while (SciaRegs.SCIFFTX.bit.TXFFST != 0); //使用SCIA
            SciaRegs.SCITXBUF=write_buf[i];
        }
    }
}

interrupt void SciRxFifoIsr(void)
{
    Uint16 i;
    for(i = 0; i < 8; i++)
    {
        data[i] = SciaRegs.SCIRXBUF.all;
    }
    SciaRegs.SCIFFRX.bit.RXFFOVRCLR = 1;
    SciaRegs.SCIFFRX.bit.RXFFINTCLR = 1;
    PieCtrlRegs.PIEACK.all |= PIEACK_GROUP9;
}

注：自定义的uart_printf函数需要修改cmd文件中分区的大小，根据报错信息修改即可，烧录到Flash和ram的两种方法，cmd文件也不同。