example_28xcoderunfromxintf.c

TI公司的2812dsp所有程序

//
//      TMDX ALPHA RELEASE
//      Intended for product evaluation purposes
//
//###########################################################################
//
// FILE:	CodeRunFromXintf.c
//
// TITLE:	Example Program That Executes From XINTF (assumes MPNMC = 1)
//
// ASSUMPTIONS:
//
//          This program requires the DSP28 header files.  To compile the
//          program as is, it should reside in the DSP28/examples/run_from_xintf
//          sub-directory.
//
//          XMP/MCn pin = 1
//
//          Map the region for XINTF Zone 7 as RAM in Code Composer
//          (Refer to the F2812.gel file supplied with CCS Studio)  
//
// DESCRIPTION:
//
//          This example configures CPU Timer0 and increments
//          a counter each time the timer asserts an interrupt.
//
//          Watch Variables:
//                 CpuTimer0.InterruptCount
//                 BackGroundCounter
//###########################################################################
//
//  Ver | dd mmm yyyy | Who  | Description of changes
// =====|=============|======|===============================================
//  0.1 | 09 Jul 2002 | A.T. | Original Release For F2812 EzDSP.
//  0.2 | 15 Jul 2002 | L.H. | Added zone init timing function.
//
//###########################################################################

// Step 0: Include required header files:
//         DSP28_Device.h: device specific definitions #include statements for
//         all of the peripheral .h definition files.

#include "DSP28_Device.h"


// Prototype statements for functions found within this file:
// Assign this function to a section to be linked to internal RAM
#pragma CODE_SECTION(xintf_zone6and7_timing,"internfuncs");
void xintf_zone6and7_timing(void);

interrupt void ISR_CPUTimer0(void);
void error(void);

// Global variables found within this file:
Uint32 BackgroundCount = 0;

// RAM Count - This counter will be stored in RAM,  to compare with that stored
// in XINTF.
#pragma DATA_SECTION(RamInterruptCount,"ramdata");
Uint32 RamInterruptCount = 0;

void main(void)
{
    //-----------------------------------------------------------------------
    // Step 1 to Step 5 should be followed in all designs:
    //
	// Step 1: Disable and clear all CPU interrupts:
	DINT;
	IER = 0x0000;
	IFR = 0x0000;

	// Step 2. Initialize System Control registers, PLL, WatchDog, Clocks to default state:
	//         This function is found in the DSP28_SysCtrl.c file.
	InitSysCtrl();

	// Step 3. Select GPIO for the device or for the specific application:
    //         This function is found in the DSP28_Gpio.c file.
	// InitGpio();  // Not required for this example

 	// Step 4. Initialize PIE to known state (control registers and vector table):
	//         The PIE vector table is initialized with pointers to shell Interrupt 
    //         Service Routines (ISR). The shell routines are found in DSP28_DefaultIsr.c.
	//         Insert user specific ISR code in the appropriate shell ISR routine in 
    //         the DSP28_DefaultIsr.c file.
    //
	//         Initialize Pie Control Registers To Default State:
    //         This function is found in the DSP28_PieCtrl.c file.
	InitPieCtrl();

	//         Initialize the PIE Vector Table To a Known State:
    //         This function is found in DSP28_PieVect.c.
	//         This function populates the PIE vector table with pointers
    //         to the shell ISR functions found in DSP28_DefaultIsr.c.
	InitPieVectTable();	
	
	// Step 5. Initialize all the Device Peripherals to a known state:
	//         This function is found in DSP28_InitPeripherals.c
    // InitPeripherals();  // For this example just init the CPU Timers
    InitCpuTimers();
    
    //-----------------------------------------------------------------------
    // User specific code:
    // 
	// Configure and Initialize CPU Timer 0 for:
	//     > CPU Timer 0 Connect To INT1.7
	//	   > Set Up For 1 Second Interrupt Period
	//	   > Point To "ISR_CPUTimer0" function

    // Initalize XINTF Zone 6 and Zone 7 timing	
	xintf_zone6and7_timing();
	
	EALLOW;	   									// This is needed to write to EALLOW protected registers
	PieVectTable.TINT0 = &ISR_CPUTimer0;
	EDIS;      									// This is needed to disable write to EALLOW protected registers
    
    PieCtrlRegs.PIEIER1.bit.INTx7 = 1;			// Enable INT1.7 which is connected to CPU-Timer 0:
    IER |= M_INT1;
    	
    SetDBGIER(M_INT1); 							// Enable INT1 for Real-Time mode	
	EINT;   									// Enable Global interrupt INTM
	ERTM;										// Enable Global realtime debug DBGM
	
	ConfigCpuTimer(&CpuTimer0, 150, 1000000);	// 150MHz CPU Freq, 1 second Period (in uSeconds)
 	StartCpuTimer0();



	for(;;)
		BackgroundCount++;                      // IDLE loop. Just sit and loop forever....

	exit(0);									// should never get here.
} 	


interrupt void ISR_CPUTimer0(void)
{
	PieCtrlRegs.PIEACK.all = 0xFFFF;
	ERTM;             							// Enable Global realtime debug DBGM
	
	CpuTimer0.InterruptCount++;					// Should increment every second.
    RamInterruptCount++;
    if(RamInterruptCount != CpuTimer0.InterruptCount) error();

}


// Configure the timing paramaters for Zone 6 and Zone 7.
// Note: this function should not be executed from the same
// zones as those being configured. 
void xintf_zone6and7_timing()
{

    // All Zones---------------------------------
    // Timing for all zones based on XTIMCLK = SYSCLKOUT 
    XintfRegs.XINTCNF2.bit.XTIMCLK = 0;
    // Buffer up to 3 writes
    XintfRegs.XINTCNF2.bit.WRBUFF = 3;
    // XCLKOUT is enabled
    XintfRegs.XINTCNF2.bit.CLKOFF = 0;
    // XCLKOUT = XTIMCLK 
    XintfRegs.XINTCNF2.bit.CLKMODE = 0;
    
    
    // Zone 6------------------------------------
    // When using ready, ACTIVE must be 1 or greater
    // Lead must always be 1 or greater
    // Zone write timing
    XintfRegs.XTIMING6.bit.XWRLEAD = 1;
    XintfRegs.XTIMING6.bit.XWRACTIVE = 1;
    XintfRegs.XTIMING6.bit.XWRTRAIL = 1;
    // Zone read timing
    XintfRegs.XTIMING6.bit.XRDLEAD = 1;
    XintfRegs.XTIMING6.bit.XRDACTIVE = 2;
    XintfRegs.XTIMING6.bit.XRDTRAIL = 0;
    
    // do not double all Zone read/write lead/active/trail timing 
    XintfRegs.XTIMING6.bit.X2TIMING = 0;
 
    // Zone will not sample READY 
    XintfRegs.XTIMING6.bit.USEREADY = 0;
    XintfRegs.XTIMING6.bit.READYMODE = 0;  
 
    // Size must be 1,1 - other values are reserved
    XintfRegs.XTIMING6.bit.XSIZE = 3;
 

    // Zone 7------------------------------------
    // When using ready, ACTIVE must be 1 or greater
    // Lead must always be 1 or greater
    // Zone write timing
    XintfRegs.XTIMING7.bit.XWRLEAD = 1;
    XintfRegs.XTIMING7.bit.XWRACTIVE = 1;
    XintfRegs.XTIMING7.bit.XWRTRAIL = 1;
    // Zone read timing
    XintfRegs.XTIMING7.bit.XRDLEAD = 1;
    XintfRegs.XTIMING7.bit.XRDACTIVE = 2;
    XintfRegs.XTIMING7.bit.XRDTRAIL = 0;
    
    // don't double all Zone read/write lead/active/trail timing 
    XintfRegs.XTIMING7.bit.X2TIMING = 0;
 
    // Zone will not sample XREADY signal  
    XintfRegs.XTIMING7.bit.USEREADY = 0;
    XintfRegs.XTIMING7.bit.READYMODE = 0;
 
    // Size must be 1,1 - other values are reserved
    XintfRegs.XTIMING7.bit.XSIZE = 3;

}

void error(void)
{
    asm("      ESTOP0");   // software breakpoint
}

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