LPC11XX使用定时器做延时程序_12MHz -

标题: LPC11XX使用定时器做延时程序_12MHz [打印本页]

作者: huge 时间: 2015-2-18 23:07
标题: LPC11XX使用定时器做延时程序_12MHz
Delay.c文件：
#include "LPC11XX.h"
#include "gpio.h"
#include "timer16.h"
#include "Delay.h"

/*系统时钟配置为12MHz，因此提供给定时器的时钟为12Mhz，因此得出以下分频值和匹配值*/

void Delay_Us(unsigned int DelayTimes)       /* setup timer #1 for delay */
{
//LPC_SYSCON->SYSAHBCLKCTRL |= (1<<8);    /* 开启定时器Timer16_1时钟--时钟配置中开启该时钟 */
  LPC_TMR16B1->TCR = 0x02;                /* reset timer */
  LPC_TMR16B1->PR  = 12;                      /* set prescaler to zero 根据AHB时钟确定分频值 */
  LPC_TMR16B1->MR0 = DelayTimes;          /* 所需的延时时间 */
  LPC_TMR16B1->IR  = 0xff;                /* reset all interrrupts 复位所有的中断 */
  LPC_TMR16B1->MCR = 0x04;                /* stop timer on match --达到匹配停止 */
  LPC_TMR16B1->TCR = 0x01;                /* start timer 启动定时器 */

while (LPC_TMR16B1->TCR & 0x01);          /* 等待直到时间到 */
LPC_TMR16B1->TCR = 0x00;                /* Close timer --关闭定时器 */
}

void Delay_Ms(unsigned int DelayTimes)    /* setup timer #1 for delay */
{
//LPC_SYSCON->SYSAHBCLKCTRL |= (1<<8);    /* 开启定时器Timer16_1时钟 */
  LPC_TMR16B1->TCR = 0x02;                /* reset timer */
  LPC_TMR16B1->PR  = 12000;                /* set prescaler to zero */
  LPC_TMR16B1->MR0 = DelayTimes;
  LPC_TMR16B1->IR  = 0xff;                /* reset all interrrupts */
  LPC_TMR16B1->MCR = 0x04;                /* stop timer on match */
  LPC_TMR16B1->TCR = 0x01;                /* start timer */

while (LPC_TMR16B1->TCR & 0x01);          /* 等待直到时间到 */
LPC_TMR16B1->TCR = 0x00;                /* Close timer */
}

void Delay_Sec(unsigned int DelayTimes)    /* setup timer #1 for delay */
{
//LPC_SYSCON->SYSAHBCLKCTRL |= (1<<8);    /* 开启定时器Timer16_1时钟 */
  LPC_TMR16B1->TCR = 0x02;                /* reset timer */
  LPC_TMR16B1->PR  = 60000;                /* set prescaler to zero */
  LPC_TMR16B1->MR0 = 200*DelayTimes;
  LPC_TMR16B1->IR  = 0xff;                /* reset all interrrupts */
  LPC_TMR16B1->MCR = 0x04;                /* stop timer on match */
  LPC_TMR16B1->TCR = 0x01;                /* start timer */

while (LPC_TMR16B1->TCR & 0x01);          /* 等待直到时间到 */
LPC_TMR16B1->TCR = 0x00;                /* Close timer */
}

Delay.h文件：

#ifndef    __DELAY_H__
#define    __DELAY_H__

void Delay_Us(unsigned int DelayTimes);          /*微秒延时函数*/

void Delay_Ms(unsigned int DelayTimes);          /*毫秒延时函数*/

void Delay_Sec(unsigned int DelayTimes);       /*秒延时函数*/

#endif

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