2021年11月12日 | 51单片机实现两片联级74HC595依次点亮LED后依次熄灭

一、使用proteus绘制简单的电路图，用于后续仿真

二、编写程序

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

---- @Project: LED-74HC595

---- @File: main.c

---- @Edit: ZHQ

---- @Version: V1.0

---- @CreationTime: 20200525

---- @ModifiedTime: 20200525

---- @Description: 第1个至第8个LED灯，先依次逐个亮，再依次逐个灭。第9至第16个LED灯一直灭。

---- 单片机：AT89C52

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

#include "reg52.h"

/*——————宏定义——————*/

#define FOSC 11059200L

#define T1MS (65536-FOSC/12/1000)   /*1ms timer calculation method in 12Tmode*/

#define const_time_level_01_08  400   

/*——————变量函数定义及声明——————*/

/*定义74HC595*/

sbit Hc595_Sh = P2^3;

sbit Hc595_St = P2^4;

sbit Hc595_Ds = P2^5;

unsigned char ucLED1 = 0;   /*代表16个灯的亮灭状态，0代表灭，1代表亮*/

unsigned char ucLED2 = 0;

unsigned char ucLED3 = 0;

unsigned char ucLED4 = 0;

unsigned char ucLED5 = 0;

unsigned char ucLED6 = 0;

unsigned char ucLED7 = 0;

unsigned char ucLED8 = 0;

unsigned char ucLED9 = 0;

unsigned char ucLED10 = 0;

unsigned char ucLED11 = 0;

unsigned char ucLED12 = 0;

unsigned char ucLED13 = 0;

unsigned char ucLED14 = 0;

unsigned char ucLED15 = 0;

unsigned char ucLED16 = 0;

unsigned char ucLed_update = 0;  /*刷新变量。每次更改LED灯的状态都要更新一次。*/

unsigned char ucLedStep_01_08 = 0; /*第1个至第8个LED跑马灯的步骤变量*/

unsigned int  uiTimeCnt_01_08 = 0; /*第1个至第8个LED跑马灯的统计定时中断次数的延时计数器*/

unsigned char ucLedStatus16_09 = 0;   /*代表底层74HC595输出状态的中间变量*/

unsigned char ucLedStatus08_01 = 0;   /*代表底层74HC595输出状态的中间变量*/

/**

* @brief  定时器0初始化函数

* @param  无

* @retval 初始化T0

**/

void Init_T0(void)

{

TMOD = 0x01;                    /*set timer0 as mode1 (16-bit)*/

TL0 = T1MS;                     /*initial timer0 low byte*/

TH0 = T1MS >> 8;                /*initial timer0 high byte*/

}

/**

* @brief  外围初始化函数

* @param  无

* @retval 初始化外围

**/

void Init_Peripheral(void)

{

ET0 = 1;/*允许定时中断*/

TR0 = 1;/*启动定时中断*/

EA = 1;/*开总中断*/

}

/**

* @brief  初始化函数

* @param  无

* @retval 初始化单片机

**/

void Init(void)

{

Init_T0();

}

/**

* @brief  延时函数

* @param  无

* @retval 无

**/

void Delay_Long(unsigned int uiDelayLong)

{

   unsigned int i;

   unsigned int j;

   for(i=0;i   {

      for(j=0;j<500;j++)  /*内嵌循环的空指令数量*/

          {

             ; /*一个分号相当于执行一条空语句*/

          }

   }

}

/**

* @brief  延时函数

* @param  无

* @retval 无

**/

void Delay_Short(unsigned int uiDelayShort)

{

   unsigned int i;

   for(i=0;i   {

; /*一个分号相当于执行一条空语句*/

   }

}

/**

* @brief  595驱动函数

* @param  无

* @retval * 两个联级74HC595的工作过程：

* 每个74HC595内部都有一个8位的寄存器，两个联级起来就有两个寄存器。ST引脚就相当于一个刷新

* 信号引脚，当ST引脚产生一个上升沿信号时，就会把寄存器的数值输出到74HC595的输出引脚并且锁存起来，

* DS是数据引脚，SH是把新数据送入寄存器的时钟信号。也就是说，SH引脚负责把数据送入到寄存器里，ST引脚

* 负责把寄存器的数据更新输出到74HC595的输出引脚上并且锁存起来。

**/

void HC595_Drive(unsigned char ucLedStatusTemp16_09, unsigned char ucLedStatusTemp08_01)

{

unsigned char i;

unsigned char ucTempData;

Hc595_Sh = 0;

Hc595_St = 0;

ucTempData = ucLedStatusTemp16_09; /*先送高8位*/

for(i = 0; i < 8; i ++)

{

if(ucTempData >= 0x80)

{

Hc595_Ds = 1;

}

else

{

Hc595_Ds = 0;

}

Hc595_Sh = 0; /*SH引脚的上升沿把数据送入寄存器*/

Delay_Short(15); 

Hc595_Sh = 1;

Delay_Short(15);

ucTempData = ucTempData <<1;

}

ucTempData = ucLedStatusTemp08_01; /*再先送低8位*/

for(i = 0; i < 8; i ++)

{

if(ucTempData >= 0x80)

{

Hc595_Ds = 1;

}

else

{

Hc595_Ds = 0;

}

Hc595_Sh = 0; /*SH引脚的上升沿把数据送入寄存器*/

Delay_Short(15); 

Hc595_Sh = 1;

Delay_Short(15);

ucTempData = ucTempData <<1;

}

Hc595_St = 0; /*ST引脚把两个寄存器的数据更新输出到74HC595的输出引脚上并且锁存起来*/

Delay_Short(15);

Hc595_St = 1;

Delay_Short(15);

Hc595_Sh = 0; /*拉低，抗干扰就增强*/

Hc595_St = 0;

Hc595_Ds = 0;

}

/**

* @brief  LED更新函数

* @param  无

* @retval 

* 把74HC595驱动程序翻译成类似单片机IO口直接驱动方式的过程。

* 每次更新LED输出，记得都要把ucLed_update置1表示更新。

**/

void LED_Update()

{

if(ucLed_update == 1)

{

ucLed_update = 0; /*及时清零，让它产生只更新一次的效果，避免一直更新。*/

if(ucLED1 == 1)

{

ucLedStatus08_01 = ucLedStatus08_01 | 0x01;

}

else

{

ucLedStatus08_01 = ucLedStatus08_01 & 0xfe;

}

if(ucLED2 == 1)

{

ucLedStatus08_01 = ucLedStatus08_01 | 0x02;

}

else

{

ucLedStatus08_01 = ucLedStatus08_01 & 0xfd;

}

if(ucLED3 == 1)

{

ucLedStatus08_01 = ucLedStatus08_01 | 0x04;

}

else

{

ucLedStatus08_01 = ucLedStatus08_01 & 0xfb;

}

if(ucLED4 == 1)

{

ucLedStatus08_01 = ucLedStatus08_01 | 0x08;

}

else

{

ucLedStatus08_01 = ucLedStatus08_01 & 0xf7;

}

if(ucLED5 == 1)

{

ucLedStatus08_01 = ucLedStatus08_01 | 0x10;

}

else

{

ucLedStatus08_01 = ucLedStatus08_01 & 0xef;

}

if(ucLED6 == 1)

{

ucLedStatus08_01 = ucLedStatus08_01 | 0x20;

}

else

{

ucLedStatus08_01 = ucLedStatus08_01 & 0xdf;

}

if(ucLED7 == 1)

{

ucLedStatus08_01 = ucLedStatus08_01 | 0x40;

}

else

{

ucLedStatus08_01 = ucLedStatus08_01 & 0xbf;

}

if(ucLED8 == 1)

{

ucLedStatus08_01 = ucLedStatus08_01 | 0x80;

}

else

{

ucLedStatus08_01 = ucLedStatus08_01 & 0x7f;

}

if(ucLED9 == 1)

{

ucLedStatus16_09 = ucLedStatus16_09 | 0x01;

}

else

{

ucLedStatus16_09 = ucLedStatus16_09 & 0xfe;

}

if(ucLED10 == 1)

{

ucLedStatus16_09 = ucLedStatus16_09 | 0x02;

}

else

{

ucLedStatus16_09 = ucLedStatus16_09 & 0xfd;

}

if(ucLED11 == 1)

{

ucLedStatus16_09 = ucLedStatus16_09 | 0x04;

}

else

{

ucLedStatus16_09 = ucLedStatus16_09 & 0xfb;

}

if(ucLED12 == 1)

{

ucLedStatus16_09 = ucLedStatus16_09 | 0x08;

}

else

{

ucLedStatus16_09 = ucLedStatus16_09 & 0xf7;

}

if(ucLED13 == 1)

{

ucLedStatus16_09 = ucLedStatus16_09 | 0x10;

}

else

{

ucLedStatus16_09 = ucLedStatus16_09 & 0xef;

}

if(ucLED14 == 1)

{

ucLedStatus16_09 = ucLedStatus16_09 | 0x20;

}

else

{

ucLedStatus16_09 = ucLedStatus16_09 & 0xdf;

}

if(ucLED15 == 1)

{

ucLedStatus16_09 = ucLedStatus16_09 | 0x40;

}

else

{

ucLedStatus16_09 = ucLedStatus16_09 & 0xbf;

}

if(ucLED16 == 1)

{

ucLedStatus16_09 = ucLedStatus16_09 | 0x80;

}

else

{

ucLedStatus16_09 = ucLedStatus16_09 & 0x7f;

}

HC595_Drive(ucLedStatus16_09, ucLedStatus08_01);

}

}

/**

* @brief  LED闪烁函数

* @param  无

* @retval 无

**/

void LED_Flicker_01_08(void)

{

switch(ucLedStep_01_08)

{

case 0:

if(uiTimeCnt_01_08 >= const_time_level_01_08)

{

uiTimeCnt_01_08 = 0; /*时间计数器清零*/

ucLED1 = 1;

ucLed_update = 1;  /*更新显示*/

ucLedStep_01_08 = 1;

}

break;

case 1:

if(uiTimeCnt_01_08 >= const_time_level_01_08)

{

uiTimeCnt_01_08 = 0; /*时间计数器清零*/

ucLED2 = 1;

ucLed_update = 1;  /*更新显示*/

ucLedStep_01_08 = 2;

}

break;

case 2:

if(uiTimeCnt_01_08 >= const_time_level_01_08)

{

uiTimeCnt_01_08 = 0; /*时间计数器清零*/

ucLED3 = 1;

ucLed_update = 1;  /*更新显示*/

ucLedStep_01_08 = 3;

}

break;

case 3:

if(uiTimeCnt_01_08 >= const_time_level_01_08)

{

uiTimeCnt_01_08 = 0; /*时间计数器清零*/

ucLED4 = 1;

ucLed_update = 1;  /*更新显示*/

ucLedStep_01_08 = 4;

}

break;

case 4:

if(uiTimeCnt_01_08 >= const_time_level_01_08)

{

uiTimeCnt_01_08 = 0; /*时间计数器清零*/

ucLED5 = 1;

ucLed_update = 1;  /*更新显示*/

ucLedStep_01_08 = 5;

}

break;

case 5:

if(uiTimeCnt_01_08 >= const_time_level_01_08)

{

uiTimeCnt_01_08 = 0; /*时间计数器清零*/

ucLED6 = 1;

ucLed_update = 1;  /*更新显示*/

ucLedStep_01_08 = 6;

}

break;

case 6:

if(uiTimeCnt_01_08 >= const_time_level_01_08)

{

uiTimeCnt_01_08 = 0; /*时间计数器清零*/

ucLED7 = 1;

ucLed_update = 1;  /*更新显示*/

ucLedStep_01_08 = 7;

}

break;

case 7:

if(uiTimeCnt_01_08 >= const_time_level_01_08)

{

uiTimeCnt_01_08 = 0; /*时间计数器清零*/

ucLED8 = 1;

ucLed_update = 1;  /*更新显示*/

ucLedStep_01_08 = 8;

}

break;

case 8:

if(uiTimeCnt_01_08 >= const_time_level_01_08)

{

uiTimeCnt_01_08 = 0; /*时间计数器清零*/

ucLED8 = 0;

ucLed_update = 1;  /*更新显示*/

ucLedStep_01_08 = 9;

}

break;

case 9:

if(uiTimeCnt_01_08 >= const_time_level_01_08)

{

uiTimeCnt_01_08 = 0; /*时间计数器清零*/

ucLED7 = 0;

ucLed_update = 1;  /*更新显示*/

ucLedStep_01_08 = 10;

}

break;

case 10:

if(uiTimeCnt_01_08 >= const_time_level_01_08)

{

uiTimeCnt_01_08 = 0; /*时间计数器清零*/

ucLED6 = 0;

ucLed_update = 1;  /*更新显示*/

ucLedStep_01_08 = 11;

}

break;

case 11:

if(uiTimeCnt_01_08 >= const_time_level_01_08)

{

uiTimeCnt_01_08 = 0; /*时间计数器清零*/

ucLED5 = 0;

ucLed_update = 1;  /*更新显示*/

ucLedStep_01_08 = 12;

}

break;

case 12:

if(uiTimeCnt_01_08 >= const_time_level_01_08)

{

uiTimeCnt_01_08 = 0; /*时间计数器清零*/

ucLED4 = 0;

ucLed_update = 1;  /*更新显示*/

ucLedStep_01_08 = 13;

}

break;

case 13:

if(uiTimeCnt_01_08 >= const_time_level_01_08)

{

uiTimeCnt_01_08 = 0; /*时间计数器清零*/

ucLED3 = 0;

ucLed_update = 1;  /*更新显示*/

ucLedStep_01_08 = 14;

}

break;

case 14:

if(uiTimeCnt_01_08 >= const_time_level_01_08)

{

uiTimeCnt_01_08 = 0; /*时间计数器清零*/

ucLED2 = 0;

ucLed_update = 1;  /*更新显示*/

ucLedStep_01_08 = 15;

}

break;

case 15:

if(uiTimeCnt_01_08 >= const_time_level_01_08)

{

uiTimeCnt_01_08 = 0; /*时间计数器清零*/

ucLED1 = 0;

ucLed_update = 1;  /*更新显示*/

ucLedStep_01_08 = 0;

}

break;

}

}

/**

* @brief  定时器0中断函数

* @param  无

* @retval 无

**/

void ISR_T0(void) interrupt 1

{

TF0 = 0;  /*清除中断标志*/

  TR0 = 0; /*关中断*/

if(uiTimeCnt_01_08 < 0xffff) /*设定这个条件，防止uiTimeCnt超范围。*/

{

uiTimeCnt_01_08 ++;

}

TL0 = T1MS;                     /*initial timer0 low byte*/