DSP 28335 SCI输出延迟一个值？

只看该作者 · 2020-12-4 15:56

DSP 28335 SCI输出延迟一个值，新人求助，望大神们指点一二！

#include "DSP28x_Project.h"    // Device Headerfile and Examples Include File

// Prototype statements for functions found within this file.

void scib_echoback_init(void);

void scib_fifo_init(void);

void scib_xmit(Uint16 a);

void scib_msg(char *msg);

// Global counts used in this example

Uint16 LoopCount;

Uint16 ErrorCount;

void main(void)

{

Uint16 ReceivedChar;

      Uint16 i;

char *msg;

InitSysCtrl();

InitScibGpio();

DINT;

InitPieCtrl();

// Disable CPU interrupts and clear all CPU interrupt flags:

IER = 0x0000;

IFR = 0x0000;

InitPieVectTable();

LoopCount = 0;

ErrorCount = 0;

scib_fifo_init();          // Initialize the SCI FIFO

scib_echoback_init();  // Initalize SCI for echoback

ScibRegs.SCIFFRX.bit.RXFFOVRCLR=1;

      for(;;)

{

//    while(ScibRegs.SCIFFRX.bit.RXFFST !=1) { } // wait for XRDY =1 for empty state

//    ReceivedChar = ScibRegs.SCIRXBUF.all;

   // Echo character back

         for(i=1;i<255;i++)

         {

            scib_xmit(i);

            DELAY_US(1);

         }

   LoopCount++;

}

}

// Test 1,SCIA  DLB, 8-bit word, baud rate 0x000F, default, 1 STOP bit, no parity

void scib_echoback_init()

{

// Note: Clocks were turned on to the Scib peripheral

// in the InitSysCtrl() function

      ScibRegs.SCICCR.all =0x0007; // 1 stop bit,  No loopback

                                 // No parity,8 char bits,

                                 // async mode, idle-line protocol

      ScibRegs.SCICTL1.all =0x0003;  // enable TX, RX, internal SCICLK,

                                 // Disable RX ERR, SLEEP, TXWAKE

      ScibRegs.SCICTL2.all =0x0003;

      ScibRegs.SCICTL2.bit.TXINTENA =1;

      ScibRegs.SCICTL2.bit.RXBKINTENA =1;

      #if (CPU_FRQ_150MHZ)

            ScibRegs.SCIHBAUD =0x0001;  // 9600 baud @LSPCLK = 37.5MHz.

            ScibRegs.SCILBAUD =0x00E7;

      #endif

      #if (CPU_FRQ_100MHZ)

   ScibRegs.SCIHBAUD =0x0001;  // 9600 baud @LSPCLK = 20MHz.

   ScibRegs.SCILBAUD =0x0044;

      #endif

      ScibRegs.SCICTL1.all =0x0023;  // Relinquish SCI from Reset

}

// Transmit a character from the SCI

void scib_xmit(Uint16 a)

{

// ScibRegs.SCITXBUF=a;

while (ScibRegs.SCIFFTX.bit.TXFFST != 0) {}

ScibRegs.SCITXBUF=a;

}

void scib_msg(char * msg)

{

int i;

i = 0;

while(msg[i] != '\0')

{

      scib_xmit(msg[i]);

      i++;

}

}

// Initalize the SCI FIFO

void scib_fifo_init()

{

// ScibRegs.SCIFFTX.all=0xE040;

      ScibRegs.SCIFFTX.all=0xE04f;

ScibRegs.SCIFFRX.all=0x204f;

ScibRegs.SCIFFCT.all=0x0;

}

DSP 28335 SCI输出延迟一个值？

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