我的嵌入式第一个程序（实现计数器）

来源：互联网发布：linux笔试题面试题编辑：程序博客网时间：2024/06/05 22:49

config.h

/****************************************Copyright (c)**************************************************

********************************************************************************************************/
#ifndef __CONFIG_H
#define __CONFIG_H

#include <LPC21xx.H>
#include <stdio.h>

#ifndef TRUE
#define TRUE 1
#endif

#ifndef FALSE
#define FALSE 0
#endif

typedef unsigned char uint8;                   /* defined for unsigned 8-bits integer variable 无符号8位整型变量 */
typedef signed   char int8;                    /* defined for signed 8-bits integer variable  有符号8位整型变量 */
typedef unsigned short uint16;                  /* defined for unsigned 16-bits integer variable 无符号16位整型变量 */
typedef signed   short int16;                   /* defined for signed 16-bits integer variable   有符号16位整型变量 */
typedef unsigned int   uint32;                  /* defined for unsigned 32-bits integer variable 无符号32位整型变量 */
typedef signed   int   int32;                   /* defined for signed 32-bits integer variable   有符号32位整型变量 */
typedef float           fp32;                    /* single precision floating point variable (32bits) 单精度浮点数（32位长度） */
typedef double          fp64;                    /* double precision floating point variable (64bits) 双精度浮点数（64位长度） */

#define Fosc            11059200                    //Crystal frequence,10MHz~25MHz，should be the same as actual status.
                                  //应当与实际一至晶振频率,10MHz~25MHz，应当与实际一至
#define Fcclk           (Fosc * 4)                  //System frequence,should be (1~32)multiples of Fosc,and should be equal or less than 60MHz.
                                  //系统频率，必须为Fosc的整数倍(1~32)，且<=60MHZ
#define Fcco            (Fcclk * 4)                 //CCO frequence,should be 2、4、8、16 multiples of Fcclk, ranged from 156MHz to 320MHz.
                                  //CCO频率，必须为Fcclk的2、4、8、16倍，范围为156MHz~320MHz
#define Fpclk           (Fcclk / 4) * 1             //VPB clock frequence , must be 1、2、4 multiples of (Fcclk / 4).
                                  //VPB时钟频率，只能为(Fcclk / 4)的1、2、4倍

#endif

c code:

#include "config.h"
void delay(uint32 dly)
{

   uint32 loop;

    for(;dly>0;dly--)
        for(loop=0;loop<5000;loop++);
}
int main(void)
{
   uint8 exp = 0x00000000;
   uint32 InputStat;
   PINSEL0 = 0x00000000;
   PINSEL1 = 0x00000000;
   IO0DIR = 0x0000001F;
   while(1)
   {
     IO0SET = 0x00000010 | exp;
InputStat = IO0PIN;
//ID0SET = 0x00060000 | 0x00000000;
    if((InputStat&0x00060000)!=0x00060000)
    {
    if((InputStat&0x00060000)!=0x00040000)
    {
   IO0CLR = 0x00000010 | exp;
   if(exp != 0x00000009)
   exp ++;
   else
   exp = 0x00000000;
    }
    if((InputStat&0x00060000)!=0x00020000)
       {
        IO0CLR = 0x00000010 | exp;
      if(exp != 0x00000000)
     exp--;
      else
       exp = 0x00000009;
    }
    while((InputStat & 0x00060000)!=0x00060000)
   {
    InputStat = IO0PIN;         // 等按键释放
   }
    }

}
return 0 ;
}