STM32Cubemx新建F429基础工程

配置STM32CubeMX

配置KEY

配置USART1

配置RCC

Project Manager

Toolchain 选择 MDK-ARM
Code Generator 配置如下

GENERATE CODE 即可

配置Keil5

魔术棒配置

– Target – 勾选 Use MicroLIB
– Debug – Flash Download – 勾选Reset and Run

基础代码

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

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
int fputc(int ch, FILE *f)
{
    HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 0xFFFF);
    return ch;
}

 uint8_t Key_Scan(GPIO_TypeDef* GPIOx,uint16_t GPIO_Pin)
 {
     if (HAL_GPIO_ReadPin(GPIOx,GPIO_Pin) == RESET ) {
         while (HAL_GPIO_ReadPin(GPIOx,GPIO_Pin) == RESET);
         return  RESET;
     } else
         return SET;
 }
/* USER CODE END 0 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
		if(Key_Scan(KEY_GPIO_Port, KEY_Pin) == RESET)
		{
			printf("key pressed\r\n");
		}
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }

编译，下载程序，就能看到按下按钮串口打印输出的现象了