标题: LPC1768 GPIO中断实验 八个LED轮流点亮100毫秒 [打印本页]
作者: wxy幻灭    时间: 2017-6-12 20:20
标题: 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:
  1. /**************************************************************************//**
  2. * @file     main.c
  3. * @brief    CMSIS Cortex-M3 GPIO example
  4. *           a LED using CM3 SysTick
  5. * @version  V1.30
  6. * @date     24. Jan 2010
  7. *
  8. * @note
  9. * Copyright (C) 2009 ARM Limited. All rights reserved.
  10. *
  11. * @par
  12. * ARM Limited (ARM) is supplying this software for use with Cortex-M
  13. * processor based microcontrollers.  This file can be freely distributed
  14. * within development tools that are supporting such ARM based processors.
  15. *
  16. * @par
  17. * THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
  18. * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
  19. * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
  20. * ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
  21. * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
  22. *
  23. ******************************************************************************/

  25. #include "LPC17xx.h"


  28. volatile uint32_t msTicks;                            /* counts 1ms timeTicks */
  29. /*----------------------------------------------------------------------------
  30.   SysTick_Handler
  31. *----------------------------------------------------------------------------*/
  32. void SysTick_Handler(void) {
  33.   msTicks++;                        /* increment counter necessary in Delay() */
  34. }

  36. /*------------------------------------------------------------------------------
  37.   delays number of tick Systicks (happens every 1 ms)
  38. *------------------------------------------------------------------------------*/
  39. __INLINE static void Delay (uint32_t dlyTicks) {
  40.   uint32_t curTicks;

  42.   curTicks = msTicks;
  43.   while ((msTicks - curTicks) < dlyTicks);
  44. }

  46. /*------------------------------------------------------------------------------
  47.   configer LED pins
  48. *------------------------------------------------------------------------------*/
  49. __INLINE static void LED_Config(void) {

  51.   LPC_GPIO2->FIODIR = 0x000000ff;               /* LEDs PORT2 are Output */
  52.   LPC_GPIO0->FIODIR = 0x00200000;
  53.   LPC_GPIO0->FIOPIN |=  0x00200000;
  54. }

  56. /*------------------------------------------------------------------------------
  57.   Switch on LEDs
  58. *------------------------------------------------------------------------------*/
  59. __INLINE static void LED_On (uint32_t led) {

  61.   LPC_GPIO2->FIOPIN |=  (led);                  /* Turn On  LED */
  62. }

  64. /*------------------------------------------------------------------------------
  65.   Switch off LEDs
  66. *------------------------------------------------------------------------------*/
  67. __INLINE static void LED_Off (uint32_t led) {

  69.   LPC_GPIO2->FIOPIN &= ~(led);                  /* Turn Off LED */
  70. }

  72. /*----------------------------------------------------------------------------
  73.   MAIN function
  74. *----------------------------------------------------------------------------*/
  75. int main (void) {
  76.   uint8_t  location;
  77.        
  78.   if (SysTick_Config(SystemCoreClock / 1000)) { /* Setup SysTick Timer for 1 msec interrupts  */
  79.     while (1);                                  /* Capture error */
  80.   }
  81.   
  82.   LED_Config();                             

  84.   while(1)
  85.   {
  86.           LED_On (0xff);
  87.         Delay (500);
  88. ……………………

  90. …………限于本文篇幅 余下代码请从51黑下载附件…………
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