28335 SCI写TXBUF但寄存器里的值没变化

只看该作者 · 2016-11-29 14:26

通过while循环不断对SCITXBUF写数据那么我观察寄存器里的值应该是不断变化的但是实际运行时寄存器内的值无变化 PC端接受不到数据
#include "DSP28x_Project.h"    // Device Headerfile and Examples Include File

void main(void)
{

  //  Uint16 ReceivedChar;
  //  char *msg;

// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2833x_SysCtrl.c file.
InitSysCtrl();

// Step 2. Initalize GPIO:
// This example function is found in the DSP2833x_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
// InitGpio(); Skipped for this example

// For this example, only init the pins for the SCI-A port.
// This function is found in the DSP2833x_Sci.c file.
InitScibGpio();

// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts
DINT;

// Initialize PIE control registers to their default state.
// The default state is all PIE interrupts disabled and flags
// are cleared.
// This function is found in the DSP2833x_PieCtrl.c file.
InitPieCtrl();

// Disable CPU interrupts and clear all CPU interrupt flags:
IER = 0x0000;
IFR = 0x0000;

// Initialize the PIE vector table with pointers to the shell Interrupt
// Service Routines (ISR).
// This will populate the entire table, even if the interrupt
// is not used in this example.  This is useful for debug purposes.
// The shell ISR routines are found in DSP2833x_DefaultIsr.c.
// This function is found in DSP2833x_PieVect.c.
InitPieVectTable();
ScibRegs.SCICCR.bit.STOPBITS=0;
ScibRegs.SCICCR.bit.PARITYENA=0;
ScibRegs.SCICCR.bit.SCICHAR=7;
ScibRegs.SCICTL1.bit.RXENA=1;
ScibRegs.SCICTL1.bit.TXENA=1;
ScibRegs.SCIHBAUD=0X0001;
ScibRegs.SCILBAUD=0X00E7;
ScibRegs.SCICTL1.bit.TXWAKE=1;
ScibRegs.SCICTL1.bit.SWRESET=1;
ScibRegs.SCITXBUF = 0x2;
while(1)
         {DELAY_US(200);
         ScibRegs.SCITXBUF=0x5;
         DELAY_US(200);
         ScibRegs.SCITXBUF=0x2;
         DELAY_US(200);
            ScibRegs.SCITXBUF=0x3;
         }