28027的SPI FIFO模式下的例程，怎么进的中断？

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28027的SPI FIFO模式下的例程，怎么进的中断？ [复制链接]

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

// Prototype statements for functions found within this file.
// interrupt void ISRTimer2(void);
interrupt void spiTxFifoIsr(void);
interrupt void spiRxFifoIsr(void);
void delay_loop(void);
void spi_fifo_init(void);
void error();

Uint16 sdata[2];     // Send data buffer
Uint16 rdata[2];     // Receive data buffer
Uint16 rdata_point;  // Keep track of where we are
                     // in the data stream to check received data

void main(void)
{
   Uint16 i;

// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2802x_SysCtrl.c file.
   InitSysCtrl();

// Step 2. Initalize GPIO:
// This example function is found in the DSP2802x_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
// InitGpio();  // Skipped for this example
// Setup only the GP I/O only for SPI-A functionality
   InitSpiaGpio();

// Step 3. Initialize PIE vector table:
// Disable and clear all CPU interrupts
   DINT;
   IER = 0x0000;
   IFR = 0x0000;

// Initialize PIE control registers to their default state:
// This function is found in the DSP2802x_PieCtrl.c file.
   InitPieCtrl();

// 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 DSP2802x_DefaultIsr.c.
// This function is found in DSP2802x_PieVect.c.
   InitPieVectTable();

// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
   EALLOW;        // This is needed to write to EALLOW protected registers
   PieVectTable.SPIRXINTA = &spiRxFifoIsr;
   PieVectTable.SPITXINTA = &spiTxFifoIsr;
   EDIS;   // This is needed to disable write to EALLOW protected registers

// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP2802x_InitPeripherals.c
// InitPeripherals(); // Not required for this example
   spi_fifo_init();          // Initialize the SPI only

// Step 5. User specific code, enable interrupts:

// Initalize the send data buffer
   for(i=0; i<2; i++)
   {
      sdata[i] = i;
   }
   rdata_point = 0;

// Enable interrupts required for this example
   PieCtrlRegs.PIECTRL.bit.ENPIE = 1;   // Enable the PIE block
   PieCtrlRegs.PIEIER6.bit.INTx1=1;     // Enable PIE Group 6, INT 1
   PieCtrlRegs.PIEIER6.bit.INTx2=1;     // Enable PIE Group 6, INT 2
   IER=0x20;                            // Enable CPU INT6
   EINT;                                // Enable Global Interrupts

// Step 6. IDLE loop. Just sit and loop forever (optional):
        for(;;);

}

// Some Useful local functions
void delay_loop()
{
    long      i;
    for (i = 0; i < 1000000; i++) {}
}

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

void spi_fifo_init()
{
// Initialize SPI FIFO registers
   SpiaRegs.SPICCR.bit.SPISWRESET=0; // Reset SPI

   SpiaRegs.SPICCR.all=0x001F;       //16-bit character, Loopback mode
   SpiaRegs.SPICTL.all=0x0017;       //Interrupt enabled, Master/Slave XMIT enabled
   SpiaRegs.SPISTS.all=0x0000;
   SpiaRegs.SPIBRR=0x0063;           // Baud rate
   SpiaRegs.SPIFFTX.all=0xC022;      // Enable FIFO's, set TX FIFO level to 2
   SpiaRegs.SPIFFRX.all=0x0022;      // Set RX FIFO level to 2
   SpiaRegs.SPIFFCT.all=0x00;
   SpiaRegs.SPIPRI.all=0x0010;

   SpiaRegs.SPICCR.bit.SPISWRESET=1;  // Enable SPI

   SpiaRegs.SPIFFTX.bit.TXFIFO=1;
   SpiaRegs.SPIFFRX.bit.RXFIFORESET=1;
}

interrupt void spiTxFifoIsr(void)
{
        Uint16 i;
    for(i=0;i<2;i++)
    {
           SpiaRegs.SPITXBUF=sdata[i];      // Send data
    }

    for(i=0;i<2;i++)                    // Increment data for next cycle
    {
           sdata[i]++;
    }

    SpiaRegs.SPIFFTX.bit.TXFFINTCLR=1;  // Clear Interrupt flag
        PieCtrlRegs.PIEACK.all|=0x20;                  // Issue PIE ACK
}

interrupt void spiRxFifoIsr(void)
{
    Uint16 i;
    for(i=0;i<2;i++)
    {
            rdata[i]=SpiaRegs.SPIRXBUF;                // Read data
        }
        for(i=0;i<2;i++)                    // Check received data
        {
            if(rdata[i] != rdata_point+i) error();
        }
        rdata_point++;
        SpiaRegs.SPIFFRX.bit.RXFFOVFCLR=1;  // Clear Overflow flag
        SpiaRegs.SPIFFRX.bit.RXFFINTCLR=1;         // Clear Interrupt flag
        PieCtrlRegs.PIEACK.all|=0x20;       // Issue PIE ack
}

//===========================================================================
// No more.
//===========================================================================
为什么会进去中断呢？在for(;;)的死循环里边什么都没有执行 啊

iny

请问这个进入中断的标志位不是数据传输空么，但是我把数据传输给注销后依然会进入中断，并且在主循环设置一个变量让其累加，要很久才加一次，也就是说主循环完成一次很慢，但是如果不注释掉数据传输，累加的就很快，也就是说完成主循环次数很快，

z电子工程

for(i=0;i<2;i++)
    {
           SpiaRegs.SPITXBUF=sdata[i];      // Send data
请教一下，是不是这里的for循环完了就会有一个发送中断？