TMS320F2803x/02x timer中断配置步骤

void main(void)
{
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the DSP2803x_SysCtrl.c file.
InitSysCtrl();

// Step 2. Initialize GPIO:
// This example function is found in the DSP2803x_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 DSP2803x_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 DSP2803x_DefaultIsr.c.
// This function is found in DSP2803x_PieVect.c.
InitPieVectTable();

// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
//把中断函数地址映射到中断向量
EALLOW; // This is needed to write to EALLOW protected registers
PieVectTable.TINT0 = &cpu_timer0_isr;
PieVectTable.TINT1 = &cpu_timer1_isr;
PieVectTable.TINT2 = &cpu_timer2_isr;
EDIS; // This is needed to disable write to EALLOW protected registers

// Step 4. Initialize the Device Peripheral. This function can be
// found in DSP2803x_CpuTimers.c
InitCpuTimers(); // For this example, only initialize the Cpu Timers

// Configure CPU-Timer 0, 1, and 2 to interrupt every second:
// 60MHz CPU Freq, 1 second Period (in uSeconds)

ConfigCpuTimer(&CpuTimer0, 60, 1000000);
ConfigCpuTimer(&CpuTimer1, 60, 1000000);
ConfigCpuTimer(&CpuTimer2, 60, 1000000);

// To ensure precise timing, use write-only instructions to write to the entire register. Therefore, if any
// of the configuration bits are changed in ConfigCpuTimer and InitCpuTimers (in DSP2803x_CpuTimers.h), the
// below settings must also be updated.

CpuTimer0Regs.TCR.all = 0x4000; // Use write-only instruction to set TSS bit = 0
CpuTimer1Regs.TCR.all = 0x4000; // Use write-only instruction to set TSS bit = 0
CpuTimer2Regs.TCR.all = 0x4000; // Use write-only instruction to set TSS bit = 0

// Step 5. User specific code, enable interrupts:

// Enable CPU int1 which is connected to CPU-Timer 0, CPU int13
// which is connected to CPU-Timer 1, and CPU int 14, which is connected
// to CPU-Timer 2:
IER |= M_INT1;
IER |= M_INT13;
IER |= M_INT14;

// 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;
}

__interrupt void cpu_timer1_isr(void)
{
CpuTimer1.InterruptCount++;
// The CPU acknowledges the interrupt.
EDIS;
}

__interrupt void cpu_timer2_isr(void)
{
EALLOW;
CpuTimer2.InterruptCount++;
// The CPU acknowledges the interrupt.
EDIS;
}