css_cmake_test/f2833x/examples/watchdog/Example_2833xWatchdog.c

//###########################################################################
//
// FILE:	Example_2833xWatchdog.c
//
// TITLE:	Watchdog interrupt Test Example
//
//!  \addtogroup f2833x_example_list
//!  <h1>Watchdog interrupt Test (watchdog)</h1>
//!
//!  This program exercises the watchdog.
//!
//!  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 the following line of code in the infinite loop:
//!  \b ServiceDog(); \n
//!
//!  If the watchdog key register is fed by the ServiceDog function
//!  then the WAKEINT interrupt is not taken.  If the key register
//!  is not fed by the ServiceDog function then WAKEINT will be taken.
//!
//!  \b Watch \b Variables \n
//!  - \b LoopCount - Number of times through the infinite loop
//!  - \b WakeCount - Number of times through WAKEINT
//
//###########################################################################
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// $Release Date: $
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//
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// 
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// 
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// 
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// $
//###########################################################################

//
// Included Files
//
#include "DSP2833x_Device.h"     // Headerfile Include File
#include "DSP2833x_Examples.h"   // Examples Include File

//
// Function Prototypes
//
__interrupt void wakeint_isr(void);

//
// Globals
//
Uint32 WakeCount;
Uint32 LoopCount;

//
// Main
//
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. Initialize 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 Group 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
//

//
// wakeint_isr -
//
__interrupt void
wakeint_isr(void)
{
    WakeCount++;

    //
    // Acknowledge this interrupt to get more from group 1
    //
    PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}

//
// End of File
//