【蓝桥杯嵌入式】2_LED

1、电路图

74HC573是八位锁存器，当控制端LE脚为高电平时，芯片“导通”，LE为低电平时芯片“截止”即将输出状态“锁存”，led此时不会改变状态，所以可通过led对应的八个引脚的电平来控制led的状态，原理图分析可知，PC脚低电平时led导通。

将PC8-PC15和PD2设置成output，并选择Output Push Pull（推挽输出）

将PC8-PC15初始电平设置为高电平，PD2设置为低电平(高电平使能)

2、代码

2.1 led.c

#include "led.h"

void LED_Disp(uchar dsLED)
{
	HAL_GPIO_WritePin(GPIOC, GPIO_PIN_All, GPIO_PIN_SET);//将GPIO的所有引脚置为高电平
	HAL_GPIO_WritePin(GPIOC, dsLED<<8, GPIO_PIN_RESET);//控制PC8~PC15
	HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2,GPIO_PIN_SET);//将锁存器打开(高电平有效)，高电平使能，PD2高电平的一瞬间数据就已经过去了
	HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2,GPIO_PIN_RESET);//将锁存器关闭，防止引脚冲突导致的误写
}

2.2 led.h

#ifndef _LED_H_
#define _LED_H_

#include "main.h"
void LED_Disp(uchar dsLED);

#endif

2.3 main.c

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2024 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "gpio.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "led.h"
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{

  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  /* USER CODE BEGIN 2 */
	uchar i = 0;
	LED_Disp(0x00);//LED ij ʼ  
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
	  for(i = 0; i < 8; i++)
	  {
		  LED_Disp(0x01<