ch3DSP的中断控制范例.pptVIP

对于XINT1/XINT2/XINT3来说，还有一个16位的计数器，只要检测到一个中断边沿，计数器就复位为0x000。这些计数器可以用来精确计时中断的出现。 图 3.14 外部中断n计数器（XINTnCTR） 表 3.16 外部中断n计数器（XINTnCTR）的域描述 3.7 示例程序 定时器中断应用示例 // DESCRIPTION: // // This example configures CPU Timer0, 1, 2 and increments // a counter each time the timer asserts an interrupt. #include DSP28x_Project.h // Device Headerfile and Examples Include File // Prototype statements for functions found within this file. interrupt void cpu_timer0_isr(void); interrupt void cpu_timer1_isr(void); interrupt void cpu_timer2_isr(void); void main(void) { // Step 1. Initialize System Control:PLL, WatchDog, enable Peripheral Clocks // This example function is found in the DSP2802x_SysCtrl.c file. InitSysCtrl(); // Step 2. Initalize GPIO:This example function is found in the DSP2802x_Gpio.c // file and illustrates how to set the GPIO to its 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 DSP2802x_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 interruptis not used in this // example. This is useful for debug purposes.The shell ISR routines are found in // DSP2802x_DefaultIsr.c.This function is found in DSP2802x_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; PieVectTable.TINT1 = cpu_timer1_isr; PieVectTable.TINT2 = cpu_timer2_isr; EDIS; // This is