拨码开关原理图

STM32主控端

座子端

设计思路

S1 S2 S3 S4输出高电平，拨码开关可以拉低电平，这样可以读取引脚状态，从而实现某些功能复用。

cubeMX配置

代码

GPIO

void MX_GPIO_Init(void)
{GPIO_InitTypeDef GPIO_InitStruct = {0};/* GPIO Ports Clock Enable */__HAL_RCC_GPIOA_CLK_ENABLE();__HAL_RCC_GPIOB_CLK_ENABLE();/*Configure GPIO pin Output Level */HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8|GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_15, GPIO_PIN_SET);/*Configure GPIO pin Output Level */HAL_GPIO_WritePin(GPIOB, GPIO_PIN_3|GPIO_PIN_6|GPIO_PIN_7, GPIO_PIN_SET);/*Configure GPIO pins : PA8 PA9 PA10 PA15 */GPIO_InitStruct.Pin = GPIO_PIN_8|GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_15;GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;GPIO_InitStruct.Pull = GPIO_NOPULL;GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);/*Configure GPIO pins : PB3 PB6 PB7 */GPIO_InitStruct.Pin = GPIO_PIN_3|GPIO_PIN_6|GPIO_PIN_7;GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;GPIO_InitStruct.Pull = GPIO_NOPULL;GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);}

主函数

/* USER CODE BEGIN Header */
/********************************************************************************* @file           : main.c* @brief          : Main program body******************************************************************************* @attention** <h2><center>&copy; Copyright (c) 2022 STMicroelectronics.* All rights reserved.</center></h2>** This software component is licensed by ST under BSD 3-Clause license,* the "License"; You may not use this file except in compliance with the* License. You may obtain a copy of the License at:*                        opensource.org/licenses/BSD-3-Clause********************************************************************************/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "usart.h"
#include "gpio.h"/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes *//* 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);static uint8_t switch_1 = 0;
static uint8_t switch_2 = 0;
static uint8_t switch_3 = 0;
static uint8_t switch_4 = 0;
/* 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();#if 1if(HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_15) == 1) {switch_1 = 1;}#endif#if 1if(HAL_GPIO_ReadPin( GPIOB, GPIO_PIN_3) == 1 ) {switch_2 = 1;}if( HAL_GPIO_ReadPin( GPIOB, GPIO_PIN_6) == 1) {switch_3 = 1;}if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_7) == 1) {switch_4 = 1;}#endifMX_USART2_UART_Init();/* USER CODE BEGIN 2 */uint8_t LED_CODE2[32]={0};uint8_t LED_CODE3[32]={1,2,3,4,5,6,7,8};HAL_StatusTypeDef TX_RET = HAL_ERROR;uint8_t count = 0;/* USER CODE END 2 *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){/* USER CODE END WHILE */TX_RET = HAL_UART_Receive(&huart2, LED_CODE2, 10, 1000);LED_CODE2[0] = count++;HAL_UART_Transmit(&huart2, LED_CODE2, 10, 1000);HAL_Delay(500);HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8, GPIO_PIN_RESET);HAL_Delay(500);HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8, GPIO_PIN_SET);if(switch_1 == 1){HAL_GPIO_WritePin(GPIOA, GPIO_PIN_9|GPIO_PIN_10, GPIO_PIN_RESET);HAL_Delay(100);HAL_GPIO_WritePin(GPIOA, GPIO_PIN_9|GPIO_PIN_10, GPIO_PIN_SET);}if(switch_2 == 1 || switch_3 == 1 || switch_4 == 1){HAL_GPIO_WritePin(GPIOA, GPIO_PIN_9|GPIO_PIN_10, GPIO_PIN_RESET);HAL_Delay(100);HAL_GPIO_WritePin(GPIOA, GPIO_PIN_9|GPIO_PIN_10, GPIO_PIN_SET);}/* USER CODE BEGIN 3 */}/* USER CODE END 3 */
}/*** @brief System Clock Configuration* @retval None*/
void SystemClock_Config(void)
{RCC_OscInitTypeDef RCC_OscInitStruct = {0};RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};/** Configure the main internal regulator output voltage*/__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);/** Initializes the RCC Oscillators according to the specified parameters* in the RCC_OscInitTypeDef structure.*/RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;RCC_OscInitStruct.MSIState = RCC_MSI_ON;RCC_OscInitStruct.MSICalibrationValue = 0;RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_5;RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK){Error_Handler();}/** Initializes the CPU, AHB and APB buses clocks*/RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_MSI;RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK){Error_Handler();}PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART2;PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_PCLK1;if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK){Error_Handler();}
}/* USER CODE BEGIN 4 *//* USER CODE END 4 *//*** @brief  This function is executed in case of error occurrence.* @retval None*/
void Error_Handler(void)
{/* USER CODE BEGIN Error_Handler_Debug *//* User can add his own implementation to report the HAL error return state *//* USER CODE END Error_Handler_Debug */
}#ifdef  USE_FULL_ASSERT
/*** @brief  Reports the name of the source file and the source line number*         where the assert_param error has occurred.* @param  file: pointer to the source file name* @param  line: assert_param error line source number* @retval None*/
void assert_failed(uint8_t *file, uint32_t line)
{/* USER CODE BEGIN 6 *//* User can add his own implementation to report the file name and line number,tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) *//* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT *//************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

Code

链接：https://pan.baidu.com/s/1cOGaGbeOq_5Smr-yTwg3VA
提取码：60hv

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STM32拨码开关验证

STM32拨码开关验证

拨码开关原理图

设计思路

cubeMX配置

代码

主函数

Code

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