DSP看门狗实验源程序

include “DSP2833x_Device.h” // Headerfile Include File

include “DSP2833x_Examples.h” // 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 DSP2833x_SysCtrl.c file.
InitSysCtrl();

// Step 2. Initalize GPIO:
// This example function is found in the DSP2833x_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 DSP2833x_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 DSP2833x_DefaultIsr.c.
// This function is found in DSP2833x_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 DSP2833x_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.PIECTRL.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
ServiceDog();

// Enable the watchdog
EALLOW;
SysCtrlRegs.WDCR = 0x0028;
EDIS;

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

  // Uncomment ServiceDog to just loop here
  // Comment ServiceDog to take the WAKEINT instead
  // ServiceDog();

}

}

// 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++;

}