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標題: LPC11XX使用定時器做延時程序_12MHz [打印本頁]

作者: huge 時間: 2015-2-18 23:07
標題: LPC11XX使用定時器做延時程序_12MHz
Delay.c文件：
#include "LPC11XX.h"
#include "gpio.h"
#include "timer16.h"
#include "Delay.h"

/*系統(tǒng)時鐘配置為12MHz，因此提供給定時器的時鐘為12Mhz，因此得出以下分頻值和匹配值*/

void Delay_Us(unsigned int DelayTimes)       /* setup timer #1 for delay */
{
//LPC_SYSCON->SYSAHBCLKCTRL |= (1<<8);    /* 開啟定時器Timer16_1時鐘--時鐘配置中開啟該時鐘 */
  LPC_TMR16B1->TCR = 0x02;                /* reset timer */
  LPC_TMR16B1->PR  = 12;                      /* set prescaler to zero 根據(jù)AHB時鐘確定分頻值 */
  LPC_TMR16B1->MR0 = DelayTimes;          /* 所需的延時時間 */
  LPC_TMR16B1->IR  = 0xff;                /* reset all interrrupts 復位所有的中斷 */
  LPC_TMR16B1->MCR = 0x04;                /* stop timer on match --達到匹配停止 */
  LPC_TMR16B1->TCR = 0x01;                /* start timer 啟動定時器 */

while (LPC_TMR16B1->TCR & 0x01);          /* 等待直到時間到 */
LPC_TMR16B1->TCR = 0x00;                /* Close timer --關(guān)閉定時器 */
}

void Delay_Ms(unsigned int DelayTimes)    /* setup timer #1 for delay */
{
//LPC_SYSCON->SYSAHBCLKCTRL |= (1<<8);    /* 開啟定時器Timer16_1時鐘 */
  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);          /* 等待直到時間到 */
LPC_TMR16B1->TCR = 0x00;                /* Close timer */
}

void Delay_Sec(unsigned int DelayTimes)    /* setup timer #1 for delay */
{
//LPC_SYSCON->SYSAHBCLKCTRL |= (1<<8);    /* 開啟定時器Timer16_1時鐘 */
  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);          /* 等待直到時間到 */
LPC_TMR16B1->TCR = 0x00;                /* Close timer */
}

Delay.h文件：

#ifndef    __DELAY_H__
#define    __DELAY_H__

void Delay_Us(unsigned int DelayTimes);          /*微秒延時函數(shù)*/

void Delay_Ms(unsigned int DelayTimes);          /*毫秒延時函數(shù)*/

void Delay_Sec(unsigned int DelayTimes);       /*秒延時函數(shù)*/

#endif

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