Example_281xCpuTimer.c
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- //###########################################################################
- //
- // FILE: Example_281xCpuTimer.c
- //
- // TITLE: DSP281x Device Getting Started 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 configuration, no other hardware configuration
- // is required.
- //
- // DESCRIPTION:
- //
- // This example configures CPU Timer0 and increments
- // a counter each time the timer asserts an interrupt.
- //
- // Watch Variables:
- // CpuTimer0.InterruptCount
- //
- //###########################################################################
- //
- // Ver | dd mmm yyyy | Who | Description of changes
- // =====|=============|======|===============================================
- // 1.00| 11 Sep 2003 | L.H. | No change since previous version (v.58 Alpha)
- //###########################################################################
- #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 cpu_timer0_isr(void);
- 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 the 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.TINT0 = &cpu_timer0_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
- InitCpuTimers(); // For this example, only initialize the Cpu Timers
- // Configure CPU-Timer 0 to interrupt every second:
- // 100MHz CPU Freq, 1 second Period (in uSeconds)
- ConfigCpuTimer(&CpuTimer0, 100, 1000000);
- StartCpuTimer0();
- // Step 5. User specific code, enable interrupts:
- // Enable CPU INT1 which is connected to CPU-Timer 0:
- IER |= M_INT1;
- // Enable TINT0 in the PIE: Group 1 interrupt 7
- PieCtrlRegs.PIEIER1.bit.INTx7 = 1;
- // Enable global Interrupts and higher priority real-time debug events:
- EINT; // Enable Global interrupt INTM
- ERTM; // Enable Global realtime interrupt DBGM
- // Step 6. IDLE loop. Just sit and loop forever (optional):
- for(;;);
- }
- interrupt void cpu_timer0_isr(void)
- {
- CpuTimer0.InterruptCount++;
- // Acknowledge this interrupt to receive more interrupts from group 1
- PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
- }
- //===========================================================================
- // No more.
- //===========================================================================