ARM外部中断笔记
[b]ARM外部中断笔记[/b]作者：转载
#include
#include "LPC21xxDEF.H" //ARM菜鸟HotPower创建定义文件
/*
* software interrupt function accept parameters and run in
* supervisor mode (interrupt protected).
*/
int myfunc1 (int i1, long i2) __swi (8) {
return (i1 / i2);
}
int myfunc2 (int i1) __swi (9) {
return (i1<<4);
}
/*
* standard interrupt function saves only R0 - R12 and returns with
*/
void DefaultIRQ (void) __irq {
unsigned int temp;
temp = VICIRQStatus;
IOPIN1 ^= (1 << P1_15); //取反P1.15
}
void EINT0IRQ (void) __irq {
unsigned int temp;
temp = VICIRQStatus;
IOPIN1 ^= (1 << P1_16); //取反P1.16
EXTINT = (1 << EINT0); //清除INT0中断标志
VICVectAddr = 0;
}
void EINT1IRQ (void) __irq {
unsigned int temp;
temp = VICIRQStatus;
IOPIN1 ^= (1 << P1_14); //取反P1.14
EXTINT = (1 << EINT1); //清除INT1中断标志
VICVectAddr = 0;
}
/*
* fast interrupt function saves only R0 - R7 and returns with
*/
void FIQ_Handler (void) __fiq {
//IOSET1 = 0x00010000; // Set pin P1.16
// IOSET1 = (1 << P1_15); // Set pin P1.15
IOPIN1 ^= (1 << P1_15); //取反P1.15
//EXTINT = 0x00000002; // Clear the peripheral interrupt flag
EXTINT = (1 << EINT2); //清除INT2中断标志
}
/*
* task functions have no register save/restore and no return.
*/
void tsk (void) __task {
while (1);
}
/*
* Sample main function
*/
int res;
void main (void) {
// IODIR1 = 0x00FF0000; // Set the LED pins as outputs
IODIR1 = (1 << P1_23) | (1 << P1_22) | (1 << P1_21) | (1 << P1_20)
|(1 << P1_19) | (1 << P1_18) | (1 << P1_17) | (1 << P1_16);//设置LED输出方式
// PINSEL0 = 0x20000000; // Enable the EXTINT1 interrupt
PINSEL0 |= (P0_14_EINT1 << P0_14_PINSEL);//选择P0.14为INT1外部中断引脚
EXTMODE |= (1 << EXTMODE1);//设置INT1为边沿触发,低电平有效
PINSEL1 |= (P0_16_EINT0 << P0_16_PINSEL);//选择P0.16为INT0外部中断引脚
EXTMODE |= (1 << EXTMODE0);//设置INT1为边沿触发,低电平有效
PINSEL0 |= (P0_15_EINT2 << P0_15_PINSEL);//选择P0.15为INT2外部中断引脚
EXTMODE |= (1 << EXTMODE2);//设置INT2为边沿触发,低电平有效
// VICVectAddr15 = (unsigned long) DefaultIRQ;
// VICIntSelect = 0x00008000; // Enable a Vic Channel as FIQ
VICIntSelect = (1 << VICIntSel_EINT2); // Enable a Vic Channel as FIQ
// VICIntSelect = 0; // Enable a Vic Channel as FIQ
VICVectCntl0 = VICIntSel_Enable | VICIntSel_EINT0;
VICVectAddr0 = (unsigned long *) &EINT0IRQ;//取INT0中断服务地址
VICVectCntl1 = VICIntSel_Enable | VICIntSel_EINT1;
VICVectAddr1 = (unsigned long *) &EINT1IRQ;//取INT1中断服务地址
// VICIntEnable = 0x00008000; // Set Default interrupt vector
VICIntEnable = (1 << VICIntSel_EINT0)
| (1 << VICIntSel_EINT1)
| (1 << VICIntSel_EINT2);//使能中断
EXTINT = (1 << EINT0) | (1 << EINT1) | (1 << EINT2); //清除INT中断标志
// VICDefVectAddr = (unsigned long *) &DefaultIRQ;
// VICSoftInt = (1 << VICIntSel_EINT1);
res = myfunc1 (10, 2); // call SWI functions
res = myfunc2 (res);
while (1); // endless loop
}