example_28xwatchdog.c

TI公司的2812dsp所有程序

//
//      TMDX ALPHA RELEASE
//      Intended for product evaluation purposes
//
//###########################################################################
//
// FILE:	Example_28xWatchdog.c
//
// TITLE:	DSP28 Watchdog interrupt test program.
//
// ASSUMPTIONS:
//
//          This program requires the DSP28 header files.  To compile the
//          program as is, it should reside in the DSP28/examples/watchdog 
//          sub-directory.
//
//          As supplied, this project is configured for "boot to H0" operation.  
//
// DESCRIPTION:
//          This program exercises the watchdog on the F2812/F2810 parts.  
//
//          First the watchdog is connected to the WAKEINT interrupt of the
//          PIE block.  The code is then put into an infinite loop.
// 
//          The user can select to feed the watchdog key register or not
//          by commenting one line of code in the infinite loop.
//
//          If the watchdog key register is fed by the KickDog function 
//          then the WAKEINT interrupt is not taken.  If the key register 
//          is not fed by the KickDog function then WAKEINT will be taken.  
//
//          Watch Variables:
//                LoopCount for the number of times through the infinite loop
//                WakeCount for the number of times through WAKEINT
//
//###########################################################################
//
//  Ver | dd mmm yyyy | Who  | Description of changes
// =====|=============|======|===============================================
//  0.57| 29 May 2002 | L.H. | Initial Release
//###########################################################################

// Step 0.  Include required header files
         // DSP28_Device.h: device specific definitions #include statements for
         // all of the peripheral .h definition files.
         // DSP28_Example.h is specific for the given example.  

#include "DSP28_Device.h"


// Prototype statements for functions found within this file.
interrupt void wakeint_isr(void);

// Global variable for this example
Uint32 WakeCount;
Uint32 LoopCount;

void main(void)
{

// Step 1. Initialize System Control registers, PLL, WatchDog, Clocks to default state:
    // For this example, this function is found in Example_WatchdogSysCtrl.c
	InitSysCtrl();

// Step 2. 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 3. Initialize PIE 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.
 
	// Disable and clear all CPU interrupts:
	DINT;
	IER = 0x0000;
	IFR = 0x0000;

	// 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 4. Initialize all the Device Peripherals to a known state:
	// This function is found in DSP28_InitPeripherals.c
    // InitPeripherals();  // Not required for this example.
 
// Step 5. User specific functions, Reassign vectors (optional), Enable Interrupts:
	
    // Reassign the PIE vector for WAKEINT to point to a different ISR then
    // the shell routine found in DSP28_DefaultIsr.c.
    // This is done if the user does not want to use the shell ISR routine
    // but instead wants to use their own ISR.  This step is optional:
	
	EALLOW;	// This is needed to write to EALLOW protected registers
	PieVectTable.WAKEINT = &wakeint_isr;
	EDIS;   // This is needed to disable write to EALLOW protected registers
    
    // Include application specific functions. This is for this example:
	

    // Enable INT1 which is connected to WAKEINT:
	IER |= M_INT1;
	
	// Enable WAKEINT in the PIE: Group 1 interrupt 8
	PieCtrlRegs.PIEIER1.bit.INTx8 = 1;
	
	// Connect the watchdog to the WAKEINT interrupt of the PIE
	// Write to the whole SCSR register to avoid clearing WDOVERRIDE bit
	EALLOW;
	SysCtrlRegs.SCSR.all = BIT1;
    EDIS;
    
    // Clear the counters
    WakeCount = 0; // Count interrupts
    LoopCount = 0; // Count times through idle loop

    // Enable global Interrupts and higher priority real-time debug events:
	
	EINT;   // Enable Global interrupt INTM
	ERTM;	// Enable Global realtime interrupt DBGM

// Step 6. IDLE loop. Just sit and loop forever (optional):	
	for(;;)
	{
	    LoopCount++;
	    
        // Uncomment KickDog to just loop here
        // Comment KickDog to take the WAKEINT instead
        // KickDog();
	}
	

} 	


// Step 7. Insert all local Interrupt Service Routines (ISRs) and functions here:	
	// If local ISRs are used, reassign vector addresses in vector table as
    // shown in Step 5

interrupt void wakeint_isr(void)
{
	WakeCount++;
	
	// Acknowledge this interrupt to get more from group 1
	PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}

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