177 lines
6.2 KiB
C
177 lines
6.2 KiB
C
// TI File $Revision: /main/9 $
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// Checkin $Date: April 21, 2008 15:43:50 $
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//###########################################################################
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//
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// FILE: Example_2833xWatchdog.c
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//
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// TITLE: DSP2833x Watchdog interrupt test program.
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//
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// ASSUMPTIONS:
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//
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// This program requires the DSP2833x header files.
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//
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// As supplied, this project is configured for "boot to SARAM"
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// operation. The 2833x Boot Mode table is shown below.
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// For information on configuring the boot mode of an eZdsp,
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// please refer to the documentation included with the eZdsp,
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//
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// $Boot_Table:
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//
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// GPIO87 GPIO86 GPIO85 GPIO84
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// XA15 XA14 XA13 XA12
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// PU PU PU PU
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// ==========================================
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// 1 1 1 1 Jump to Flash
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// 1 1 1 0 SCI-A boot
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// 1 1 0 1 SPI-A boot
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// 1 1 0 0 I2C-A boot
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// 1 0 1 1 eCAN-A boot
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// 1 0 1 0 McBSP-A boot
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// 1 0 0 1 Jump to XINTF x16
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// 1 0 0 0 Jump to XINTF x32
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// 0 1 1 1 Jump to OTP
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// 0 1 1 0 Parallel GPIO I/O boot
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// 0 1 0 1 Parallel XINTF boot
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// 0 1 0 0 Jump to SARAM <- "boot to SARAM"
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// 0 0 1 1 Branch to check boot mode
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// 0 0 1 0 Boot to flash, bypass ADC cal
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// 0 0 0 1 Boot to SARAM, bypass ADC cal
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// 0 0 0 0 Boot to SCI-A, bypass ADC cal
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// Boot_Table_End$
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//
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// DESCRIPTION:
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//
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// This program exercises the watchdog.
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//
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// First the watchdog is connected to the WAKEINT interrupt of the
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// PIE block. The code is then put into an infinite loop.
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//
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// The user can select to feed the watchdog key register or not
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// by commenting one line of code in the infinite loop.
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//
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// If the watchdog key register is fed by the ServiceDog function
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// then the WAKEINT interrupt is not taken. If the key register
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// is not fed by the ServiceDog function then WAKEINT will be taken.
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//
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// Watch Variables:
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// LoopCount for the number of times through the infinite loop
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// WakeCount for the number of times through WAKEINT
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//
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//###########################################################################
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// $TI Release: DSP2833x/DSP2823x Header Files V1.20 $
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// $Release Date: August 1, 2008 $
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//###########################################################################
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#include "DSP2833x_Device.h" // Headerfile Include File
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#include "DSP2833x_Examples.h" // Examples Include File
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// Prototype statements for functions found within this file.
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interrupt void wakeint_isr(void);
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// Global variables for this example
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Uint32 WakeCount;
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Uint32 LoopCount;
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void main(void)
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{
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// Step 1. Initialize System Control:
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// PLL, WatchDog, enable Peripheral Clocks
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// This example function is found in the DSP2833x_SysCtrl.c file.
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InitSysCtrl();
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// Step 2. Initalize GPIO:
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// This example function is found in the DSP2833x_Gpio.c file and
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// illustrates how to set the GPIO to it's default state.
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// InitGpio(); // Skipped for this example
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// Step 3. Clear all interrupts and initialize PIE vector table:
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// Disable CPU interrupts
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DINT;
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// Initialize PIE control registers to their default state.
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// The default state is all PIE interrupts disabled and flags
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// are cleared.
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// This function is found in the DSP2833x_PieCtrl.c file.
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InitPieCtrl();
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// Disable CPU interrupts and clear all CPU interrupt flags:
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IER = 0x0000;
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IFR = 0x0000;
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// Initialize the PIE vector table with pointers to the shell Interrupt
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// Service Routines (ISR).
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// This will populate the entire table, even if the interrupt
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// is not used in this example. This is useful for debug purposes.
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// The shell ISR routines are found in DSP2833x_DefaultIsr.c.
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// This function is found in DSP2833x_PieVect.c.
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InitPieVectTable();
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// Interrupts that are used in this example are re-mapped to
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// ISR functions found within this file.
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EALLOW; // This is needed to write to EALLOW protected registers
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PieVectTable.WAKEINT = &wakeint_isr;
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EDIS; // This is needed to disable write to EALLOW protected registers
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// Step 4. Initialize all the Device Peripherals:
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// This function is found in DSP2833x_InitPeripherals.c
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// InitPeripherals(); // Not required for this example
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// Step 5. User specific code, enable interrupts:
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// Clear the counters
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WakeCount = 0; // Count interrupts
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LoopCount = 0; // Count times through idle loop
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// Connect the watchdog to the WAKEINT interrupt of the PIE
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// Write to the whole SCSR register to avoid clearing WDOVERRIDE bit
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EALLOW;
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SysCtrlRegs.SCSR = BIT1;
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EDIS;
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// Enable WAKEINT in the PIE: Group 1 interrupt 8
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// Enable INT1 which is connected to WAKEINT:
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PieCtrlRegs.PIECTRL.bit.ENPIE = 1; // Enable the PIE block
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PieCtrlRegs.PIEIER1.bit.INTx8 = 1; // Enable PIE Gropu 1 INT8
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IER |= M_INT1; // Enable CPU int1
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EINT; // Enable Global Interrupts
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// Reset the watchdog counter
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ServiceDog();
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// Enable the watchdog
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EALLOW;
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SysCtrlRegs.WDCR = 0x0028;
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EDIS;
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// Step 6. IDLE loop. Just sit and loop forever (optional):
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for(;;)
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{
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LoopCount++;
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// Uncomment ServiceDog to just loop here
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// Comment ServiceDog to take the WAKEINT instead
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// ServiceDog();
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}
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}
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// Step 7. Insert all local Interrupt Service Routines (ISRs) and functions here:
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// If local ISRs are used, reassign vector addresses in vector table as
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// shown in Step 5
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interrupt void wakeint_isr(void)
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{
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WakeCount++;
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// Acknowledge this interrupt to get more from group 1
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PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
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}
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//===========================================================================
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// No more.
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//===========================================================================
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