LPC1768 GPIO中断实验 八个LED轮流点亮100毫秒

路虎LPC1768开发板 GPIO实验

这个例程是将路虎开发板上的八个LED轮流点亮100毫秒，

采用SYStick 定时器中断方式做延时  系统时钟设置在100MHZ

使用时，短路JP8跳线使能LED。

单片机源程序如下:

/**************************************************************************//**

* @file     main.c

* @brief    CMSIS Cortex-M3 GPIO example

*           a LED using CM3 SysTick

* @version  V1.30

* @date     24. Jan 2010

*

* @note

* Copyright (C) 2009 ARM Limited. All rights reserved.

*

* @par

* ARM Limited (ARM) is supplying this software for use with Cortex-M 

* processor based microcontrollers.  This file can be freely distributed 

* within development tools that are supporting such ARM based processors. 

*

* @par

* THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED

* OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF

* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.

* ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR

* CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.

*

******************************************************************************/

#include "LPC17xx.h"

volatile uint32_t msTicks;                            /* counts 1ms timeTicks */

/*----------------------------------------------------------------------------

  SysTick_Handler

*----------------------------------------------------------------------------*/

void SysTick_Handler(void) {

  msTicks++;                        /* increment counter necessary in Delay() */

}

/*------------------------------------------------------------------------------

  delays number of tick Systicks (happens every 1 ms)

*------------------------------------------------------------------------------*/

__INLINE static void Delay (uint32_t dlyTicks) {

  uint32_t curTicks;

  curTicks = msTicks;

  while ((msTicks - curTicks) < dlyTicks);

}

/*------------------------------------------------------------------------------

  configer LED pins

*------------------------------------------------------------------------------*/

__INLINE static void LED_Config(void) {

  LPC_GPIO2->FIODIR = 0x000000ff;               /* LEDs PORT2 are Output */

  LPC_GPIO0->FIODIR = 0x00200000; 

  LPC_GPIO0->FIOPIN |=  0x00200000; 

}

/*------------------------------------------------------------------------------

  Switch on LEDs

*------------------------------------------------------------------------------*/

__INLINE static void LED_On (uint32_t led) {

  LPC_GPIO2->FIOPIN |=  (led);                  /* Turn On  LED */

}

/*------------------------------------------------------------------------------

  Switch off LEDs

*------------------------------------------------------------------------------*/

__INLINE static void LED_Off (uint32_t led) {

  LPC_GPIO2->FIOPIN &= ~(led);                  /* Turn Off LED */

}

/*----------------------------------------------------------------------------

  MAIN function

*----------------------------------------------------------------------------*/

int main (void) {

  uint8_t  location;

  if (SysTick_Config(SystemCoreClock / 1000)) { /* Setup SysTick Timer for 1 msec interrupts  */

    while (1);                                  /* Capture error */

  }

  LED_Config();                             

  while(1) 

  {

          LED_On (0xff);

        Delay (500);

……………………