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. ******************************************************************************/
    
24. 
    
25. #include "LPC17xx.h"
    
26. 
    
27. 
    
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. }
    
35. 
    
36. /*------------------------------------------------------------------------------
    
37.   delays number of tick Systicks (happens every 1 ms)
    
38. *------------------------------------------------------------------------------*/
    
39. __INLINE static void Delay (uint32_t dlyTicks) {
    
40.   uint32_t curTicks;
    
41. 
    
42.   curTicks = msTicks;
    
43.   while ((msTicks - curTicks) < dlyTicks);
    
44. }
    
45. 
    
46. /*------------------------------------------------------------------------------
    
47.   configer LED pins
    
48. *------------------------------------------------------------------------------*/
    
49. __INLINE static void LED_Config(void) {
    
50. 
    
51.   LPC_GPIO2->FIODIR = 0x000000ff;               /* LEDs PORT2 are Output */
    
52.   LPC_GPIO0->FIODIR = 0x00200000;
    
53.   LPC_GPIO0->FIOPIN |=  0x00200000;
    
54. }
    
55. 
    
56. /*------------------------------------------------------------------------------
    
57.   Switch on LEDs
    
58. *------------------------------------------------------------------------------*/
    
59. __INLINE static void LED_On (uint32_t led) {
    
60. 
    
61.   LPC_GPIO2->FIOPIN |=  (led);                  /* Turn On  LED */
    
62. }
    
63. 
    
64. /*------------------------------------------------------------------------------
    
65.   Switch off LEDs
    
66. *------------------------------------------------------------------------------*/
    
67. __INLINE static void LED_Off (uint32_t led) {
    
68. 
    
69.   LPC_GPIO2->FIOPIN &= ~(led);                  /* Turn Off LED */
    
70. }
    
71. 
    
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();                             
    
83. 
    
84.   while(1)
    
85.   {
    
86.           LED_On (0xff);
    
87.         Delay (500);
    
88. ……………………
    
89. 
    
90. …………限于本文篇幅 余下代码请从51黑下载附件…………
    

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