example_281xwatchdog.c

DSP281X的开发工程模板,希望对大家有帮助

//###########################################################################
//
// FILE:   Example_281xWatchdog.c
//
// TITLE:  DSP281x Watchdog interrupt test program.
//
// ASSUMPTIONS:
//
//         This program requires the DSP281x V1.00 header files.  
//         As supplied, this project is configured for "boot to H0" operation.  
//
//         Other then boot mode pin configuration, no other hardware configuration
//         is required.
//
// 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
// =====|=============|======|===============================================
//  1.00| 11 Sep 2003 | L.H. | Changes since previous version (v.58 Alpha) 
//      |             |      | Cleanup 
//      |             |      | Now uses the common DSP281x_SysCtrl.c file
//      |             |      | and the WD is re-enabled in this file. 
//###########################################################################


#include "DSP281x_Device.h"     // DSP281x Headerfile Include File
#include "DSP281x_Examples.h"   // DSP281x Examples Include File

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

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

void main(void)
{

// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP281x_SysCtrl.c file.
   InitSysCtrl();

// Step 2. Initalize GPIO: 
// This example function is found in the DSP281x_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
// InitGpio();  // Skipped for this example  

// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts 
   DINT;

// Initialize PIE control registers to their default state.
// The default state is all PIE interrupts disabled and flags
// are cleared.  
// This function is found in the DSP281x_PieCtrl.c file.
   InitPieCtrl();

// Disable CPU interrupts and clear all CPU interrupt flags:
   IER = 0x0000;
   IFR = 0x0000;

// 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 DSP281x_DefaultIsr.c.
// This function is found in DSP281x_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.WAKEINT = &wakeint_isr;
   EDIS;   // This is needed to disable write to EALLOW protected registers
	
// Step 4. Initialize all the Device Peripherals:
// This function is found in DSP281x_InitPeripherals.c
// InitPeripherals(); // Not required for this example
 
// Step 5. User specific code, enable interrupts:

// Clear the counters
   WakeCount = 0; // Count interrupts
   LoopCount = 0; // Count times through idle loop

// Connect the watchdog to the WAKEINT interrupt of the PIE
// Write to the whole SCSR register to avoid clearing WDOVERRIDE bit
   EALLOW;
   SysCtrlRegs.SCSR = BIT1;
   EDIS;

// Enable WAKEINT in the PIE: Group 1 interrupt 8
// Enable INT1 which is connected to WAKEINT:
   PieCtrlRegs.PIECRTL.bit.ENPIE = 1;   // Enable the PIE block
   PieCtrlRegs.PIEIER1.bit.INTx8 = 1;   // Enable PIE Gropu 1 INT8
   IER |= M_INT1;                       // Enable CPU INT1
   EINT;                                // Enable Global Interrupts

// Reset the watchdog counter
   KickDog();
      
// Enable the watchdog
   EALLOW;
   SysCtrlRegs.WDCR = 0x0028;   
   EDIS;
   
// 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.
//===========================================================================