- //###########################################################################
- //
- // 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.
- //===========================================================================