TMS320F28335 SPI SLAVE 问题请教

// TI File $Revision: /main/3 $
// Checkin $Date: June 28, 2010   09:18:54 $
//###########################################################################
//
// FILE:   Example_2834xSpi_FFDLB_int.c
//
// TITLE:  DSP2834x Device Spi Digital Loop Back with Interrupts Example.
//
// ASSUMPTIONS:
//
//    This program requires the DSP2834x header files.
//
//    This program uses the internal loop back test mode of the peripheral.
//    Other then boot mode pin configuration, no other hardware configuration
//    is required.
//
//    As supplied, this project is configured for "boot to SARAM"
//    operation.  The 2834x Boot Mode table is shown below.
//    For information on configuring the boot mode of an eZdsp,
//    please refer to the documentation included with the eZdsp,
//
//       $Boot_Table:
//
//         GPIO87   GPIO86     GPIO85   GPIO84
//          XA15     XA14       XA13     XA12
//           PU       PU         PU       PU
//        ==========================================
//            1        1          1        1    TI Test Only
//            1        1          1        0    SCI-A boot
//            1        1          0        1    SPI-A boot
//            1        1          0        0    I2C-A boot timing 1
//            1        0          1        1    eCAN-A boot timing 1
//            1        0          1        0    McBSP-A boot
//            1        0          0        1    Jump to XINTF x16
//            1        0          0        0    Jump to XINTF x32
//            0        1          1        1    eCAN-A boot timing 2
//            0        1          1        0    Parallel GPIO I/O boot
//            0        1          0        1    Parallel XINTF boot
//            0        1          0        0    Jump to SARAM	    <- "boot to SARAM"
//            0        0          1        1    Branch to check boot mode
//            0        0          1        0    I2C-A boot timing 2
//            0        0          0        1    Reserved
//            0        0          0        0    TI Test Only
//                                              Boot_Table_End$$
//
// DESCRIPTION:
//
//    This program is a SPI-A example that uses the internal loopback of
//    the peripheral.  Both interrupts and the SPI FIFOs are used.
//
//    A stream of data is sent and then compared to the recieved stream.
//
//    The sent data looks like this:
//    0000 0001 0002 0003 0004 0005 0006 0007
//    0001 0002 0003 0004 0005 0006 0007 0008
//    0002 0003 0004 0005 0006 0007 0008 0009
//    ....
//    FFFE FFFF 0000 0001 0002 0003 0004 0005
//    FFFF 0000 0001 0002 0003 0004 0005 0006
//     etc..
//
//    This pattern is repeated forever.
//
//
// Watch Variables:
//     sdata[8]    - Data to send
//     rdata[8]    - Received data
//     rdata_point - Used to keep track of the last position in
//                   the receive stream for error checking
//###########################################################################
//
// Original Source by S.D.
//
// $TI Release: 2834x Header Files V1.12 $
// $Release Date: March 2011 $
//###########################################################################

#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);
interrupt void spidTxFifoIsr(void);
interrupt void spidRxFifoIsr(void);
void delay_loop(void);
void spi_fifo_init(void);
void error();


Uint16 sdata_spia[8];     // Send data buffer
Uint16 rdata_spia[8];     // Receive data buffer

Uint16 sdata_spid[8];     // Send data buffer
Uint16 rdata_spid[8];     // 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 DSP2834x_SysCtrl.c file.
   InitSysCtrl();

// Step 2. Initalize GPIO:
// This example function is found in the DSP2834x_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
   InitSpiGpio();

// 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 DSP2834x_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 DSP2834x_DefaultIsr.c.
// This function is found in DSP2834x_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;
   PieVectTable.SPIRXINTD = &spidRxFifoIsr;
   PieVectTable.SPITXINTD = &spidTxFifoIsr;
   EDIS;   // This is needed to disable write to EALLOW protected registers


// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP2834x_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


      sdata_spia[0] = 0x1100;
      sdata_spia[1] = 0x2200;
      sdata_spia[2] = 0x3300;
      sdata_spia[3] = 0x4400;
      sdata_spia[4] = 0x5500;
      sdata_spia[5] = 0x6600;
      sdata_spia[6] = 0x7700;
      sdata_spia[7] = 0x8800;




      sdata_spid[0] = 0x9900;
      sdata_spid[1] = 0xAA00;
      sdata_spid[2] = 0xBB00;
      sdata_spid[3] = 0xCC00;
      sdata_spid[4] = 0xDD00;
      sdata_spid[5] = 0xEE00;
      sdata_spid[6] = 0xFF00;
      sdata_spid[7] = 0x0000;











   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
   PieCtrlRegs.PIEIER6.bit.INTx7=1;     // Enable PIE Group 6, INT 1
   PieCtrlRegs.PIEIER6.bit.INTx8=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=0x000F;       //16-bit character,
   SpiaRegs.SPICTL.all=0x0017;       //Interrupt enabled, Master XMIT enabled
   SpiaRegs.SPISTS.all=0x0000;
   SpiaRegs.SPIBRR=0x00F;           // Baud rate
   SpiaRegs.SPIFFTX.all=0xC028;      // Enable FIFO's, set TX FIFO level to 8
   SpiaRegs.SPIFFRX.all=0x0028;      // Set RX FIFO level to 8
   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;

   SpidRegs.SPICCR.bit.SPISWRESET=0; // Reset SPI

   SpidRegs.SPICCR.all=0x000F;       //16-bit character,
   SpidRegs.SPICTL.all=0x0013;       //Interrupt enabled, Slave XMIT enabled
   SpidRegs.SPISTS.all=0x0000;
   SpidRegs.SPIBRR=0x00F;           // Baud rate
   SpidRegs.SPIFFTX.all=0xC028;      // Enable FIFO's, set TX FIFO level to 8
   SpidRegs.SPIFFRX.all=0x0028;      // Set RX FIFO level to 8
   SpidRegs.SPIFFCT.all=0x00;
   SpidRegs.SPIPRI.all=0x0010;

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

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

interrupt void spiTxFifoIsr(void)
{
 	Uint16 i;
    for(i=0;i<8;i++)
    {
 	   SpiaRegs.SPITXBUF=sdata_spia[i];      // Send data
    }

    for(i=0;i<8;i++)                    // Increment data for next cycle
    {
    	sdata_spia[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<8;i++)
    {
	    rdata_spia[i]=SpiaRegs.SPIRXBUF;		// Read data
	}

	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
}

interrupt void spidTxFifoIsr(void)
{
 	Uint16 i;
    for(i=0;i<8;i++)
    {
 	   SpidRegs.SPITXBUF=sdata_spid[i];      // Send data
    }

    for(i=0;i<8;i++)                    // Increment data for next cycle
    {
 	   sdata_spid[i]++;
    }


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

interrupt void spidRxFifoIsr(void)
{
    Uint16 i;
    for(i=0;i<8;i++)
    {
	    rdata_spid[i]=SpidRegs.SPIRXBUF;		// Read data
	}

	rdata_point++;
	SpidRegs.SPIFFRX.bit.RXFFOVFCLR=1;  // Clear Overflow flag
	SpidRegs.SPIFFRX.bit.RXFFINTCLR=1; 	// Clear Interrupt flag
	PieCtrlRegs.PIEACK.all|=0x20;       // Issue PIE ack
}

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// No more.
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