STM32 board level support package for keys

Board support package for keys , initialization GPIO( Input configured as , Read GPIO Pin level )

Read whether the key is pressed , That is, the state of the key

Key use PA0 and PC13 Pin

First create bsp_key.c and bsp_key.h file

  hold bsp_key.c Add to the project

bsp_key.h Writing process

Define the executable functions in this file , Pin status

#ifndef _BSP_KEY_H_
#define _BSP_KEY_H_
// Import this header file , Ability to visit HAL function library 
#include "stm32f1xx.h"
// The macro definition represents the key state 
#define KEY_ON 1;
#define KEY_OFF 0;

// initialization KEY Corresponding GPIO Pin 
void KEY_GPIO_Init(void);
// Determine the status of the key , Customize 2 Parameter types , Which pin , And pin number , There is a return value , Easy to judge the state 
 uint8_t Key_Scan(GPIO_TypeDef* GPIOx,uint16_t GPIO_Pin);

#endif

bsp_key.c Writing process

#include "./key/bsp_key.h"

void KEY_GPIO_Init(void)
{
GPIO_InitTypeDef KEY_GPIO_Init;
	// Because it's used PA0 and PC13 foot , To enable these two ports 
// Can make PA0 Pin 
	__HAL_RCC_GPIOA_CLK_ENABLE();
// Can make PC13 Pin 
	__HAL_RCC_GPIOC_CLK_ENABLE();

//stm32f1xx_hal_gpio.h The first 116 That's ok 
//#define  GPIO_MODE_INPUT      0x00000000u   /*!< Input Floating Mode                   */
// Set pin function 
KEY_GPIO_Init.Mode=GPIO_MODE_INPUT;
	KEY_GPIO_Init.Pin=GPIO_PIN_0;
	KEY_GPIO_Init.Pull=GPIO_NOPULL;
	KEY_GPIO_Init.Speed=GPIO_SPEED_FREQ_LOW;
	// initialization 2 individual GPIO Pin 
	HAL_GPIO_Init(GPIOA,&KEY_GPIO_Init);
	KEY_GPIO_Init.Pin=GPIO_PIN_13;
	HAL_GPIO_Init(GPIOC,&KEY_GPIO_Init);
}
// Write a function to judge whether the key is pressed 
uint8_t Key_Scan(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
{
	// Judge whether the key is pressed , Find this method to know ,GPIO_PIN_SET High level 
if(HAL_GPIO_ReadPin(GPIOx,GPIO_Pin)==GPIO_PIN_SET){
// Key pressed 
	while(HAL_GPIO_ReadPin(GPIOx,GPIO_Pin)==GPIO_PIN_SET);
return KEY_ON;

}else{
// Key not pressed 
return KEY_OFF;
}

}

stay main.c To complete the required functions

		if(Key_Scan(GPIOA,GPIO_PIN_0)== KEY_ON)
			LED_B_Toggle;
		if(Key_Scan(GPIOC,GPIO_PIN_13)==KEY_ON)
			LED_G_Toggle;