F28027使用SPI内部连接自测模式时出现问题

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

#include "f2802x_common/include/adc.h"
#include "f2802x_common/include/clk.h"
#include "f2802x_common/include/flash.h"
#include "f2802x_common/include/gpio.h"
#include "f2802x_common/include/pie.h"
#include "f2802x_common/include/pll.h"
#include "f2802x_common/include/spi.h"
#include "f2802x_common/include/wdog.h"

// Prototype statements for functions found within this file.
// interrupt void ISRTimer2(void);
void delay_loop(void);
void spi_xmit(uint16_t a);
void spi_fifo_init(void);
void spi_init(void);
void error(void);

ADC_Handle myAdc;
CLK_Handle myClk;
FLASH_Handle myFlash;
GPIO_Handle myGpio;
PIE_Handle myPie;
SPI_Handle mySpi;

uint16_t sdata; // send data
uint16_t rdata; // received data

void main(void)
{

CPU_Handle myCpu;
PLL_Handle myPll;
WDOG_Handle myWDog;
// Initialize all the handles needed for this application myAdc = ADC_init((void *)ADC_BASE_ADDR, sizeof(ADC_Obj));
myClk = CLK_init((void *)CLK_BASE_ADDR, sizeof(CLK_Obj));
myCpu = CPU_init((void *)NULL, sizeof(CPU_Obj));
myFlash = FLASH_init((void *)FLASH_BASE_ADDR, sizeof(FLASH_Obj));
myGpio = GPIO_init((void *)GPIO_BASE_ADDR, sizeof(GPIO_Obj));
myPie = PIE_init((void *)PIE_BASE_ADDR, sizeof(PIE_Obj));
myPll = PLL_init((void *)PLL_BASE_ADDR, sizeof(PLL_Obj));
mySpi = SPI_init((void *)SPIA_BASE_ADDR, sizeof(SPI_Obj));
myWDog = WDOG_init((void *)WDOG_BASE_ADDR, sizeof(WDOG_Obj));
// Perform basic system initialization WDOG_disable(myWDog);
CLK_enableAdcClock(myClk);
(*Device_cal)();
//Select the internal oscillator 1 as the clock source
CLK_setOscSrc(myClk, CLK_OscSrc_Internal);
// Setup the PLL for x12 /2 which will yield 60Mhz = 10Mhz * 12 / 2
PLL_setup(myPll, PLL_Multiplier_12, PLL_DivideSelect_ClkIn_by_2);
// Disable the PIE and all interrupts
PIE_disable(myPie);
PIE_disableAllInts(myPie);
CPU_disableGlobalInts(myCpu);
CPU_clearIntFlags(myCpu);
// If running from flash copy RAM only functions to RAM#ifdef _FLASH
memcpy(&RamfuncsRunStart, &RamfuncsLoadStart, (size_t)&RamfuncsLoadSize);
#endif

// Initalize GPIO
GPIO_setPullUp(myGpio, GPIO_Number_16, GPIO_PullUp_Enable);
GPIO_setPullUp(myGpio, GPIO_Number_17, GPIO_PullUp_Enable);
GPIO_setPullUp(myGpio, GPIO_Number_18, GPIO_PullUp_Enable);
GPIO_setPullUp(myGpio, GPIO_Number_19, GPIO_PullUp_Enable);
GPIO_setQualification(myGpio, GPIO_Number_16, GPIO_Qual_ASync);
GPIO_setQualification(myGpio, GPIO_Number_17, GPIO_Qual_ASync);
GPIO_setQualification(myGpio, GPIO_Number_18, GPIO_Qual_ASync);
GPIO_setQualification(myGpio, GPIO_Number_19, GPIO_Qual_ASync);
GPIO_setMode(myGpio, GPIO_Number_16, GPIO_16_Mode_SPISIMOA);
GPIO_setMode(myGpio, GPIO_Number_17, GPIO_17_Mode_SPISOMIA);
GPIO_setMode(myGpio, GPIO_Number_18, GPIO_18_Mode_SPICLKA);
GPIO_setMode(myGpio, GPIO_Number_19, GPIO_19_Mode_SPISTEA_NOT);

// Setup a debug vector table and enable the PIE
PIE_setDebugIntVectorTable(myPie);
PIE_enable(myPie);

spi_init(); // Initialize SPI
spi_fifo_init(); // Initialize the SPI FIFOs

sdata = 0x0000;
for(;;) {
// Transmit data
SPI_write(mySpi, sdata);
// Wait until data is received
//while(SPI_getRxFifoStatus(mySpi) == SPI_FifoStatus_Empty){
//}
//delay_loop();
// Check against sent data
rdata = SPI_read(mySpi);
//if(rdata != sdata)
//error();
sdata++;
}
}

void delay_loop()
{
long i;
for (i = 0; i < 1000000; i++) {
}
return;
}

void error(void)
{
asm(" ESTOP0"); // Test failed!! Stop!
for (;;){
}
}

void spi_init()
{
CLK_enableSpiaClock(myClk);
SPI_reset(mySpi);

// Reset on, rising edge, 16-bit char bits
SPI_setCharLength(mySpi, SPI_CharLength_16_Bits);

// Enable master mode, normal phase,
// enable talk, and SPI int disabled.
SPI_setMode(mySpi, SPI_Mode_Master);
SPI_enableTx(mySpi);
SPI_setBaudRate(mySpi, SPI_BaudRate_1_MBaud);
SPI_disableInt(mySpi);
SPI_setClkPolarity(mySpi,SPI_ClkPolarity_OutputRisingEdge_InputFallingEdge);
SPI_setClkPhase(mySpi, SPI_ClkPhase_Normal);
// Relinquish SPI from Reset
SPI_enableLoopBack(mySpi);
SPI_enable(mySpi);

// Set so breakpoints don't disturb xmission
SPI_setPriority(mySpi, SPI_Priority_FreeRun);
return;
}

void spi_fifo_init()
{
// Initialize SPI FIFO registers
SPI_enableChannels(mySpi);
SPI_enableFifoEnh(mySpi);
SPI_resetTxFifo(mySpi);
SPI_clearTxFifoInt(mySpi); SPI_resetRxFifo(mySpi);
SPI_clearRxFifoInt(mySpi);
SPI_setRxFifoIntLevel(mySpi, SPI_FifoLevel_4_Words);
return;
}

//===========================================================================
// No more.
//===========================================================================

这个程序，我在调试界面观察变量的值时，rdata的值没有发生变化，按照程序写的不是应该跟sdata一起发生变化么？