标签：lin 代码 模拟实现 select interval return unsigned cin 数值
本实例使用LPC2138微控制器，Keil+Proteus模拟实现。
本实例使用定时器计数，当计数值到达时触发定时器中断，在定时器中断程序中喂狗，涉及模块包括晶振、PLL、定时器、看门狗和VIC。
每次喂狗的同时，将P0.1 GPIO输出电平取反，外接一个LED灯作为Active信号灯。
直接贴代码：
main.c
int main(void) { int ret = 0; unsigned char reason = 0; unsigned char byte = 0; /* Fosc & CCLK is 60MHz */ /* FPCLK is 30MHz */ VPBDIV = 0x02; watch_dog_init(); timer0_init(); while(1); return 0; }
watchdog.c
#include <lpc213x.h> #include "watchdog.h" #define WDOG_INTREVAL_TIME 0x01FFFFFF void watch_dog_init(void) { /* Configure WDOG Timeout Interval */ WDTC = WDOG_INTREVAL_TIME; /* Enable WDOG, reset the CPU while WDOG timeout */ WDMOD = 0x3; } void watch_dog_feed() { /* reload WDOG by WDTC */ WDFEED = 0xAA; WDFEED = 0x55; }
timer.c
#include <lpc213x.h> #include "timer.h" #include "watchdog.h" void timer0_isr(void) __irq { if ((VICIRQStatus & 0x10) && (T0IR & 0x01)) { /* Clear MR0 Interrupt */ T0IR = 0x01; /* ACT LED Blink */ if (IOSET0 & 0x01) { IOCLR0 = 0x01; } else { IOSET0 = 0x01; } /* feed the WDOG */ watch_dog_feed(); } } void timer0_init(void) { /* ACT LED Initialization */ IODIR0 |= 0x1; IOSET0 |= 0x1; /* Timer0 Timer Mode */ T0CTCR = 0x00; /* Clear Timer0 Counter & Prescale Counter */ T0TC = 0x00; T0PC = 0x00; /* Interrupt & Reset on MR0 */ T0MCR = 0x03; T0MR0 = 0x5FF; T0PR = 0x5FF; /* Enable Timer0 */ T0TCR = 0x01; /* Timer0 VIC */ VICIntSelect = 0x00; VICVectCntl0 = 0x20 | 4; VICVectAddr0 = (unsigned int)timer0_isr; /* Enable Timer0 VIC */ VICIntEnable |= 0x10; }
标签：lin 代码 模拟实现 select interval return unsigned cin 数值
原文地址：https://www.cnblogs.com/justin-y-lin/p/12340632.html
