51单片机旋转编码器模块测试代码 -

#include <intrins.h>
#include "public.h"
#include "rotary_encoder.h"
#include "LCD1602.h"
#include "port.h"
void rotary_encoder_delay50us()//12.000MHz
{
u8 i;
_nop_();
i=22;
while(--i);
}
void rotary_encoder_delay10ms() //12.000MHz
{
u8 i,j;
i=20;
j=113;
do
{
while (--j);
}while (--i);
}
//旋转编码器初始化
void rotary_encoder_init()
{
ROTARY_ENCODER_CLK=1;
ROTARY_ENCODER_DT=1;
ROTARY_ENCODER_SW=1;
IT0=1;
EX0=1;
EA=1;
LCD1602_print_char(0,0,'O');
LCD1602_print_char(0,1,'F');
LCD1602_print_char(0,2,'F');
LCD1602_print_char(1,0,'0'+0);
LCD1602_print_char(1,1,'0'+0);
LCD1602_print_char(1,2,'0'+0);
}
//扫描旋转编码器,返回值为1代表正转,返回值为0代表反转,返回值为0xFF代表未旋转或旋转错误
u8 scan_rotary_encoder()
{
u8 rotary_encoder_state;//旋转编码器状态
u16 forced_out;//强制退出
//旋转编码器状态
//如果在刚开始ROTARY_ENCODER_CLK和ROTARY_ENCODER_DT都为1,则状态为1
//如果在刚开始ROTARY_ENCODER_CLK和ROTARY_ENCODER_DT都为0,则状态为0
if((ROTARY_ENCODER_CLK)&&(ROTARY_ENCODER_DT)) rotary_encoder_state=1;
else if((!ROTARY_ENCODER_CLK)&&(!ROTARY_ENCODER_DT)) rotary_encoder_state=0;
//ROTARY_ENCODER_CLK和ROTARY_ENCODER_DT为同一电平时检测
if(((ROTARY_ENCODER_CLK)&&(ROTARY_ENCODER_DT))||((!ROTARY_ENCODER_CLK)&&(!ROTARY_ENCODER_DT)))
{
//用最多150ms时间来等待ROTARY_ENCODER_CLK电平或ROTARY_ENCODER_DT电平变化(此时AB为11或00)
forced_out=3000;
while(((ROTARY_ENCODER_CLK)&&(ROTARY_ENCODER_DT))||((!ROTARY_ENCODER_CLK)&&(!ROTARY_ENCODER_DT)))
{
--forced_out;
rotary_encoder_delay50us();
if(!forced_out) return 0xFF;//超时则强制退出,返回错误码
}
//每次电平变化必定旋转了编码器,电平变化后要消抖
rotary_encoder_delay10ms();
//当ROTARY_ENCODER_CLK为低电平,ROTARY_ENCODER_DT为高电平时
if((!ROTARY_ENCODER_CLK)&&(ROTARY_ENCODER_DT))
{
//用150ms时间来等待ROTARY_ENCODER_DT电平变化(此时AB为01)
forced_out=3000;
while((!ROTARY_ENCODER_CLK)&&(ROTARY_ENCODER_DT))
{
--forced_out;
rotary_encoder_delay50us();
if(!forced_out) return 0xFF;//超时则强制退出,返回错误码
}
//每次电平变化必定旋转了编码器,电平变化后要消抖
rotary_encoder_delay10ms();
//当ROTARY_ENCODER_CLK为低电平,而且ROTARY_ENCODER_DT也为低电平
//或ROTARY_ENCODER_CLK为高电平,而且ROTARY_ENCODER_DT也为高电平(AB为11或00)
//此时 AB从11到01到00 或 AB从00到01到11
if(((ROTARY_ENCODER_CLK)&&(ROTARY_ENCODER_DT))||((!ROTARY_ENCODER_CLK)&&(!ROTARY_ENCODER_DT)))
{
//如果旋转编码器的状态为1则返回1,代表正转一下
if(rotary_encoder_state) return 1;
//如果旋转编码器的状态为0则返回0,代表反转一下
else return 0;
}
//若AB不为11或不为00则返回旋转编码器错误码
else return ROTARY_ENCODER_ERROR;
}
//当ROTARY_ENCODER_CLK为高电平,ROTARY_ENCODER_DT为低电平时
else
{
//当ROTARY_ENCODER_CLK为高电平,ROTARY_ENCODER_DT为低电平时
if((ROTARY_ENCODER_CLK)&&(!ROTARY_ENCODER_DT))
{
//用150ms时间来等待ROTARY_ENCODER_CLK电平变化(此时AB为10)
forced_out=3000;
while((ROTARY_ENCODER_CLK)&&(!ROTARY_ENCODER_DT))
{
--forced_out;
rotary_encoder_delay50us();
if(!forced_out) return 0xFF;//超时则强制退出,返回错误码
}
//每次电平变化必定旋转了编码器,电平变化后要消抖
rotary_encoder_delay10ms();
//当ROTARY_ENCODER_CLK为低电平,而且ROTARY_ENCODER_DT也为低电平
//或ROTARY_ENCODER_CLK为高电平,而且ROTARY_ENCODER_DT也为高电平(AB为11或00)
//此时 AB从11到10到00 或 AB从00到10到11
if(((ROTARY_ENCODER_CLK)&&(ROTARY_ENCODER_DT))||((!ROTARY_ENCODER_CLK)&&(!ROTARY_ENCODER_DT)))
{
//如果旋转编码器的状态为0则返回1,代表正转一下
if(!rotary_encoder_state) return 1;
//如果旋转编码器的状态为1则返回0,代表反转一下
else return 0;
}
//若AB不为11或不为00则返回旋转编码器错误码
else return ROTARY_ENCODER_ERROR;
}
}
}
//未响应返回旋转编码器错误码
return 0xFF;
}
//旋转编码器中断
void rotary_encoder_interrupt() interrupt 0
{
static u8 dat=0;
u8 temp=0xFF;//临时变量先赋旋转编码器错误码的值
if(!ROTARY_ENCODER_SW)//检查按键是否按下
{
rotary_encoder_delay10ms();//若按键按下,则消抖
if(!ROTARY_ENCODER_SW)//再次检查按键是否按下
{
while(!ROTARY_ENCODER_SW);//按键按住则程序卡死在这里
rotary_encoder_delay10ms();//松手消抖
LCD1602_print_char(0,0,'O');
LCD1602_print_char(0,1,'N');
LCD1602_print_char(0,2,' ');
while(ROTARY_ENCODER_SW)//现在扫描旋转编码器
{
//扫描旋转编码器,返回值为1代表正转,返回值为0代表反转,返回值为0xFF代表未旋转或旋转错误
temp=scan_rotary_encoder();
if(temp!=0xFF)//去除旋转编码器错误码
{
//利用 unsigned char 特性
//当temp为255时,再加1则溢出,变为0
//同理,当temp为0时,再减1则变为255
if(temp==0x01) ++dat;
if(temp==0x00) --dat;
//LCD1602打印字符(行,列,字符)
LCD1602_print_char(1,0,'0'+(dat/100%10));
LCD1602_print_char(1,1,'0'+(dat/10%10));
LCD1602_print_char(1,2,'0'+(dat/1%10));
}
}
rotary_encoder_delay10ms();//按键按下,则消抖
while(!ROTARY_ENCODER_SW);//按键按住则程序卡死在这里
rotary_encoder_delay10ms();//松手消抖
LCD1602_print_char(0,0,'O');
LCD1602_print_char(0,1,'F');
LCD1602_print_char(0,2,'F');
}
}
}

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