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研发客服自己做了一块74HC595的IO扩展板卡，出于灵活考虑，没有都采用级联的方式，而是2组多芯片级联的结构。基于STM32平台设计。
结构示意图
74HV595内部结构图
头文件：
#ifndef __74HC595_H__
#define __74HC595_H__
#include "main.h"
typedef struct{
GPIO_TypeDef* GPIOx;
uint16_t GPIO_Pin;
}strHC595_Port;
//非级联74HC595芯片组数
#define HC595_GROUP_NUMBER 2
/* 第一组芯片 */
//使能
#define HC595_OE1_RCC_GPIOX_EN __HAL_RCC_GPIOA_CLK_ENABLE()
#define HC595_OE1_GPIO GPIOA
#define HC595_OE1_PIN GPIO_PIN_4
//锁存
#define HC595_RCLK1_RCC_GPIOX_EN __HAL_RCC_GPIOA_CLK_ENABLE()
#define HC595_RCLK1_GPIO GPIOA
#define HC595_RCLK1_PIN GPIO_PIN_6
//时钟
#define HC595_SRCLK1_RCC_GPIOX_EN __HAL_RCC_GPIOA_CLK_ENABLE()
#define HC595_SRCLK1_GPIO GPIOA
#define HC595_SRCLK1_PIN GPIO_PIN_7
//清除
#define HC595_SRCLR1_RCC_GPIOX_EN __HAL_RCC_GPIOA_CLK_ENABLE()
#define HC595_SRCLR1_GPIO GPIOA
#define HC595_SRCLR1_PIN GPIO_PIN_5
//数据
#define HC595_DATA1_RCC_GPIOX_EN __HAL_RCC_GPIOC_CLK_ENABLE()
#define HC595_DATA1_GPIO GPIOC
#define HC595_DATA1_PIN GPIO_PIN_4
/* 第二组芯片 */
//使能
#define HC595_OE2_RCC_GPIOX_EN __HAL_RCC_GPIOA_CLK_ENABLE()
#define HC595_OE2_GPIO GPIOB
#define HC595_OE2_PIN GPIO_PIN_3
//锁存
#define HC595_RCLK2_RCC_GPIOX_EN __HAL_RCC_GPIOB_CLK_ENABLE()
#define HC595_RCLK2_GPIO GPIOB
#define HC595_RCLK2_PIN GPIO_PIN_5
//时钟
#define HC595_SRCLK2_RCC_GPIOX_EN __HAL_RCC_GPIOB_CLK_ENABLE()
#define HC595_SRCLK2_GPIO GPIOB
#define HC595_SRCLK2_PIN GPIO_PIN_6
//清除
#define HC595_SRCLR2_RCC_GPIOX_EN __HAL_RCC_GPIOB_CLK_ENABLE()
#define HC595_SRCLR2_GPIO GPIOB
#define HC595_SRCLR2_PIN GPIO_PIN_4
//数据
#define HC595_DATA2_RCC_GPIOX_EN __HAL_RCC_GPIOB_CLK_ENABLE()
#define HC595_DATA2_GPIO GPIOB
#define HC595_DATA2_PIN GPIO_PIN_7
extern void HC595_Init(void);
extern uint8_t HC595_write(uint8_t group,uint8_t nbit,uint32_t datas);
#endif /*__74HC595_H__*/
源文件：
复制
#include "74HC595.h"
strHC595_Port HC595_OE_Port[HC595_GROUP_NUMBER]=
{
{HC595_OE1_GPIO,HC595_OE1_PIN},
{HC595_OE2_GPIO,HC595_OE2_PIN},
//元素个数与HC595_GROUP_NUMBER对应
};
strHC595_Port HC595_RCLK_Port[HC595_GROUP_NUMBER]=
{
{HC595_RCLK1_GPIO,HC595_RCLK1_PIN},
{HC595_RCLK2_GPIO,HC595_RCLK2_PIN},
//元素个数与HC595_GROUP_NUMBER对应
};
strHC595_Port HC595_SRCLK_Port[HC595_GROUP_NUMBER]=
{
{HC595_SRCLK1_GPIO,HC595_SRCLK1_PIN},
{HC595_SRCLK2_GPIO,HC595_SRCLK2_PIN},
//元素个数与HC595_GROUP_NUMBER对应
};
strHC595_Port HC595_SRCLR_Port[HC595_GROUP_NUMBER]=
{
{HC595_SRCLR1_GPIO,HC595_SRCLR1_PIN},
{HC595_SRCLR2_GPIO,HC595_SRCLR2_PIN},
//元素个数与HC595_GROUP_NUMBER对应
};
strHC595_Port HC595_DATA_Port[HC595_GROUP_NUMBER]=
{
{HC595_DATA1_GPIO,HC595_DATA1_PIN},
{HC595_DATA2_GPIO,HC595_DATA2_PIN},
//元素个数与HC595_GROUP_NUMBER对应
};
//操作接口宏定义
#define HC595_OE_PIN(X) HC595_OE_Port[X].GPIO_Pin
#define HC595_OE_GPIO(X) HC595_OE_Port[X].GPIOx
#define HC595_OE_H(X) HAL_GPIO_WritePin(HC595_OE_GPIO(X), HC595_OE_PIN(X), GPIO_PIN_SET)
#define HC595_OE_L(X) HAL_GPIO_WritePin(HC595_OE_GPIO(X), HC595_OE_PIN(X), GPIO_PIN_RESET)
#define HC595_RCLK_PIN(X) HC595_RCLK_Port[X].GPIO_Pin
#define HC595_RCLK_GPIO(X) HC595_RCLK_Port[X].GPIOx
#define HC595_RCLK_H(X) HAL_GPIO_WritePin(HC595_RCLK_GPIO(X), HC595_RCLK_PIN(X), GPIO_PIN_SET)
#define HC595_RCLK_L(X) HAL_GPIO_WritePin(HC595_RCLK_GPIO(X), HC595_RCLK_PIN(X), GPIO_PIN_RESET)
#define HC595_SRCLK_PIN(X) HC595_SRCLK_Port[X].GPIO_Pin
#define HC595_SRCLK_GPIO(X) HC595_SRCLK_Port[X].GPIOx
#define HC595_SRCLK_H(X) HAL_GPIO_WritePin(HC595_SRCLK_GPIO(X), HC595_SRCLK_PIN(X), GPIO_PIN_SET)
#define HC595_SRCLK_L(X) HAL_GPIO_WritePin(HC595_SRCLK_GPIO(X), HC595_SRCLK_PIN(X), GPIO_PIN_RESET)
#define HC595_SRCLR_PIN(X) HC595_SRCLR_Port[X].GPIO_Pin
#define HC595_SRCLR_GPIO(X) HC595_SRCLR_Port[X].GPIOx
#define HC595_SRCLR_H(X) HAL_GPIO_WritePin(HC595_SRCLR_GPIO(X), HC595_SRCLR_PIN(X), GPIO_PIN_SET)
#define HC595_SRCLR_L(X) HAL_GPIO_WritePin(HC595_SRCLR_GPIO(X), HC595_SRCLR_PIN(X), GPIO_PIN_RESET)
#define HC595_DATA_PIN(X) HC595_DATA_Port[X].GPIO_Pin
#define HC595_DATA_GPIO(X) HC595_DATA_Port[X].GPIOx
#define HC595_DATA_H(X) HAL_GPIO_WritePin(HC595_DATA_GPIO(X), HC595_DATA_PIN(X), GPIO_PIN_SET)
#define HC595_DATA_L(X) HAL_GPIO_WritePin(HC595_DATA_GPIO(X), HC595_DATA_PIN(X), GPIO_PIN_RESET)
void HC595_delay_us(uint8_t t_us)
{
//修改为系统中对应的微秒级延时函数,根据实际需求可以换成更小的ns级延时
delay_us(t_us);
}
/*
*描述：初始化HC595_GROUP_NUMBER组芯片对应的控制引脚
*/
void HC595_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
uint8_t i = 0;
/* GPIO Ports Clock Enable */
//第一组芯片引脚时钟
HC595_OE1_RCC_GPIOX_EN;
HC595_RCLK1_RCC_GPIOX_EN;
HC595_SRCLK1_RCC_GPIOX_EN;
HC595_SRCLR1_RCC_GPIOX_EN;
HC595_DATA1_RCC_GPIOX_EN;
//第二组芯片引脚时钟
HC595_OE2_RCC_GPIOX_EN;
HC595_RCLK2_RCC_GPIOX_EN;
HC595_SRCLK2_RCC_GPIOX_EN;
HC595_SRCLR2_RCC_GPIOX_EN;
HC595_DATA2_RCC_GPIOX_EN;
/*Configure GPIO pin */
for(i=0; i