[the second day of actual combat of smart lock project based on stm32f401ret6 in 10 days] (lighting with library function and register respectively)

One 、 Use register to light up

Hardware analysis ： First of all, we have to look at the schematic diagram to find the corresponding GPIO mouth


Then go to the register used
First of all, let's take a look at GPIO Port is attached to AHB1 above , First enable GPIOB The clock of

Here is RCC AHB1 The register of

Then take a look at the configuration GPIO Port register







Let's use the above schematic diagram and register to write our lighting LED Code for , If the establishment of the project is not possible, you can take a look at the previous blog

Build one first led.h and led.c Don't put the papers in user The folder inc and src
led.h The code in

#ifndef _LED_H
#define _LED_H


#include "stm32f4xx.h"
void Led_Config(void);


#endif

led.c The code in
Mainly the configuration register

#include "led.h"

/*  The functionality ：LED initialization   Shape parameter ：void  Return value ：void  explain ： 1、 open GPIOB The clock  2、PB8 -----  Universal push-pull mode  PB9 -----  Universal push-pull mode  */

void Led_Config(void)
{
    
	RCC->AHB1ENR |= 1 << 1;			// open GPIOB The clock of 
	
	GPIOB->MODER &=~ (3 << 16);
	GPIOB->MODER |= (1 << 16);
	GPIOB->OTYPER &=~ (1 << 8);
	GPIOB->OSPEEDR |= 2 << 16;
	GPIOB->PUPDR &=~ (3 << 16);
	GPIOB->ODR |= 1 << 8;// Default off 
	
	GPIOB->MODER &=~ (3 << 18);
	GPIOB->MODER |= (1 << 18);
	GPIOB->OTYPER &=~ (1 << 9);
	GPIOB->OSPEEDR |= 2 << 18;
	GPIOB->PUPDR &=~ (3 << 18);
	GPIOB->ODR |= 1 << 9;// Default off 
}

main.c The code in

#include "main.h"
int main()
{
    
	Led_Config();//LED initialization 
	while(1)
	{
    	
		/* * The register is lit LED（PB8、PB9） */
		GPIOB->ODR &=~ (1 << 8);//LED1 bright 
		GPIOB->ODR &=~ (1 << 9);//LED2 bright  
		GPIOB->ODR &=(1 << 8);//LED1 destroy 
		GPIOB->ODR &=(1 << 9);//LED2 destroy 
	}
}

main.h The code in

#ifndef _MAIN_H
#define _MAIN_H

#include "stm32f4xx.h"
#include "led.h"


#endif

The two blue ones are the lights on

Two 、 Use library functions to light up

The project is the same as the above except that the code has changed , Instead, call the library function
led.h The code in

#ifndef _LED_H
#define _LED_H


#include "stm32f4xx.h"
void Led_Config(void);


#endif

led.c The code in

#include "led.h"

/*  The functionality ：LED initialization   Shape parameter ：void  Return value ：void  explain ： 1、 open GPIOB The clock  2、PB8 -----  Universal push-pull mode  PB9 -----  Universal push-pull mode  */

void Led_Config(void)
{
    
		/* * Library function version  */	
	GPIO_InitTypeDef GPIO_InitStruct;// Declare struct variables 
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);// open GPIOB The clock of 
	// initialization PB8 and PB9
	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;// General output 
	GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;// Push pull output 
	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;// Pin 8 
	GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;// No up and down 
	GPIO_InitStruct.GPIO_Speed = GPIO_Fast_Speed;// Speed 50Mhz
	
	GPIO_Init(GPIOB, &GPIO_InitStruct);
	
	GPIO_SetBits(GPIOB, GPIO_Pin_8);// Default off 
	GPIO_SetBits(GPIOB, GPIO_Pin_9);// Default off 
}

main.h The code in

#ifndef _MAIN_H
#define _MAIN_H

#include "stm32f4xx.h"
#include "led.h"


#endif

main.c The code in

#include "main.h"
int main()
{
    
	Led_Config();//LED initialization 
	while(1)
	{
    	
		/* * Library functions are lit LED（PB8、PB9） */
		// Method 1 does not use macro definitions 
		GPIO_ResetBits(GPIOB, GPIO_Pin_8);
		GPIO_ResetBits(GPIOB, GPIO_Pin_9);
		GPIO_SetBits(GPIOB, GPIO_Pin_8);
		GPIO_SetBits(GPIOB, GPIO_Pin_9);
	}
}

The two blue ones are the lights on

The blog will be written here first , Next, let's write about the operation of keys , If this blog post is helpful to you, please pay attention to it 、 give the thumbs-up 、 Collect it , Thank you for your support ！