177 lines
6.2 KiB
C
177 lines
6.2 KiB
C
|
// TI File $Revision: /main/9 $
|
||
|
|
// Checkin $Date: April 21, 2008 15:43:50 $
|
||
|
|
//###########################################################################
|
||
|
|
//
|
||
|
|
// FILE: Example_2833xWatchdog.c
|
||
|
|
//
|
||
|
|
// TITLE: DSP2833x Watchdog interrupt test program.
|
||
|
|
//
|
||
|
|
// ASSUMPTIONS:
|
||
|
|
//
|
||
|
|
// This program requires the DSP2833x header files.
|
||
|
|
//
|
||
|
|
// As supplied, this project is configured for "boot to SARAM"
|
||
|
|
// operation. The 2833x Boot Mode table is shown below.
|
||
|
|
// For information on configuring the boot mode of an eZdsp,
|
||
|
|
// please refer to the documentation included with the eZdsp,
|
||
|
|
//
|
||
|
|
// $Boot_Table:
|
||
|
|
//
|
||
|
|
// GPIO87 GPIO86 GPIO85 GPIO84
|
||
|
|
// XA15 XA14 XA13 XA12
|
||
|
|
// PU PU PU PU
|
||
|
|
// ==========================================
|
||
|
|
// 1 1 1 1 Jump to Flash
|
||
|
|
// 1 1 1 0 SCI-A boot
|
||
|
|
// 1 1 0 1 SPI-A boot
|
||
|
|
// 1 1 0 0 I2C-A boot
|
||
|
|
// 1 0 1 1 eCAN-A boot
|
||
|
|
// 1 0 1 0 McBSP-A boot
|
||
|
|
// 1 0 0 1 Jump to XINTF x16
|
||
|
|
// 1 0 0 0 Jump to XINTF x32
|
||
|
|
// 0 1 1 1 Jump to OTP
|
||
|
|
// 0 1 1 0 Parallel GPIO I/O boot
|
||
|
|
// 0 1 0 1 Parallel XINTF boot
|
||
|
|
// 0 1 0 0 Jump to SARAM <- "boot to SARAM"
|
||
|
|
// 0 0 1 1 Branch to check boot mode
|
||
|
|
// 0 0 1 0 Boot to flash, bypass ADC cal
|
||
|
|
// 0 0 0 1 Boot to SARAM, bypass ADC cal
|
||
|
|
// 0 0 0 0 Boot to SCI-A, bypass ADC cal
|
||
|
|
// Boot_Table_End$
|
||
|
|
//
|
||
|
|
// DESCRIPTION:
|
||
|
|
//
|
||
|
|
// 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 one line of code in the infinite loop.
|
||
|
|
//
|
||
|
|
// 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.
|
||
|
|
//
|
||
|
|
// Watch Variables:
|
||
|
|
// LoopCount for the number of times through the infinite loop
|
||
|
|
// WakeCount for the number of times through WAKEINT
|
||
|
|
//
|
||
|
|
//###########################################################################
|
||
|
|
// $TI Release: DSP2833x/DSP2823x Header Files V1.20 $
|
||
|
|
// $Release Date: August 1, 2008 $
|
||
|
|
//###########################################################################
|
||
|
|
|
||
|
|
|
||
|
|
#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++;
|
||
|
|
|
||
|
|
// Acknowledge this interrupt to get more from group 1
|
||
|
|
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
|
||
|
|
}
|
||
|
|
|
||
|
|
//===========================================================================
|
||
|
|
// No more.
|
||
|
|
//===========================================================================
|