74LS164 for stm32 源码下载

  在单片机系统中， 如果并行口的IO资源不够，而串行口又没有其他的作用， 那么我们可以用74LS164来扩展并行IO口，节约单片机资源。

      74LS164是一个串行输入并行输出的移位寄存器。并带有清除端。
      其中： Q0—Q7 并行输出端 。 A,B串行输入端。 MR 清除端， 为0时，输出清零。 CP 时钟输入端。

74LS164引脚定义：

74LS164逻辑表：

相关原理：

 

74LS164.c

---------------------------------------------------------------------------------------------------------------------------------------------

 

#include "stm32f10x.h"

#include "stm32f10x_rcc.h"

#include "stm32f10x_gpio.h"

#include "74LS164.h"

/* 延时模块82615468 sp-320-12

 * */

static void delay(u32 t)

{

	u32 i;

	while(t--)

		for (i = 0; i < 1; i++);

}

void Ls164Init(void)

{

	GPIO_InitTypeDef GPIO_InitStructure;

	RCC_APB2PeriphClockCmd(LS164_CLK_GPIO_CLK | LS164_DATA_GPIO_CLK, ENABLE);

	GPIO_InitStructure.GPIO_Pin = LS164_CLK_PIN;

	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

	GPIO_Init(LS164_CLK_GPIO, &GPIO_InitStructure);

	GPIO_InitStructure.GPIO_Pin = LS164_DATA_PIN;

	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

	GPIO_Init(LS164_DATA_GPIO, &GPIO_InitStructure);

	LS164_CLK_H();

	LS164_DATA_H();

}

void Ls164Send(u8 data)

{

	u8 k;

	for(k = 8; k > 0; k--)

	{

		LS164_CLK_L();

		delay(1);

		if(data & 0x01)

			LS164_DATA_H();

		else

			LS164_DATA_L();

		LS164_CLK_H();

		delay(1);

		data >>= 1;

	}

}

/*                          _____________________________________________________________

  164SendTime1 Line0  0bit |                                                             |

               Line1  1bit |                                                             |

               Line2  2bit |                                                             |

               Line3  3bit |                                                             |

               Line4  4bit |                                                             |

               Line5  5bit |                                                             |

               Line6  6bit |                                                             |

               Line7  7bit |                                                             |

  164SendTime0 Line8  0bit |                                                             |

               Line9  1bit |                                                             |

               Line10 2bit |                                                             |

               Line11 3bit |                                                             |

               Line12 4bit |                                                             |

               Line13 5bit |                                                             |

               Line14 6bit |                                                             |

               Line15 7bit |_____________________________________________________________|

 */

void LedLineOut(u8 LineN)

{

	u16 LineData;

	LineN %= 16;                   //行取值范围

	LineData = ~(0x0001 << LineN); //取反低电平有效

	Ls164Send(LineData & 0xff);    //第1片164(Line0~7)

	Ls164Send(LineData >> 8);      //第0片164(Line8~15)

}

//end of file	

74LS164.h

---------------------------------------------------------------------------------------------------------------------------------------------------------------

 

#ifndef __74LS164_H__

#define __74LS164_H__

#define	 LS164_CLK_PIN    	      GPIO_Pin_4

#define  LS164_CLK_GPIO           GPIOA

#define  LS164_CLK_GPIO_CLK       RCC_APB2Periph_GPIOA

#define  LS164_CLK_H()            GPIOA->BSRR = LS164_CLK_PIN

#define  LS164_CLK_L()		        GPIOA->BRR = LS164_CLK_PIN

#define	 LS164_DATA_PIN    	      GPIO_Pin_5

#define  LS164_DATA_GPIO          GPIOA

#define  LS164_DATA_GPIO_CLK      RCC_APB2Periph_GPIOA

#define  LS164_DATA_H()           GPIOA->BSRR = LS164_DATA_PIN

#define  LS164_DATA_L()		        GPIOA->BRR = LS164_DATA_PIN

void Ls164Send(u8 data);

void Ls164Init(void);

void LedLineOut(u8 LineN);

#endif

 

 

74LS164 for stm32 源码下载