STM32 drive relay stm32f103rct6 drives IO port based on register and library function

Description of the relay

Relay is a kind of small voltage control large voltage device , The input is a switch , There will be no output voltage , The specific wiring method depends on how you use the switch ;
For the specific working principle of the relay, please refer to the previous article “51 The single chip microcomputer drives the relay module to light up ”

Parameter test of relay

Take the relay module of our own store as an example , When the trigger voltage of the relay is higher than a certain value , The relay will be triggered , The trigger light comes on
When measured here 1.3V about , The actual trigger voltage is the best 2V above ,5.5V following ;

When the trigger signal is below a certain value , The relay will reset , Will not be triggered , The trigger light goes out , When measured here 1V, However, the actual trigger signal is recommended to be lower than 0.5V;

STM32F103 Register versioning IO mouth

1： Procedural phenomena

The signal control pin is STM32F103RCT6 Of PA11 Pin ;

STM32 Control relay - Register version

1. from STM32F10 Series of reference manuals ,GPIO The clock is enabled by APB2 Controlled by peripheral devices ;

As can be seen from the figure above , Only need to IOPA Set as 1, Set others to zero , You can open it GPIOA Enabled by ,

2. Then the configuration port is selected as universal push-pull output , Speed 50MHZ;

As can be seen from the figure CNF11 Configure to 00,MODE11 Configure to 11, Others are set to 0 that will do ;

3. control GPIOA11 output ;

ODR11 Set as 1 Output high level ;

4. Code demonstration ,

#include "stm32f10x.h" // Device header
#include "Delay.h"

int main(void)
{
    
	RCC->APB2ENR = 0x00000004;     // open GPIOA Can make 
	GPIOA->CRH = 0x00003000;       // To configure PA11 The pin is in universal push-pull output mode 
	while(1)
	{
    
	GPIOA->ODR = 0x00000800;       //PA11 Output high level 
	Delay_ms(1000);
	GPIOA->ODR = 0x00000000;       //PA11 Output low level 
	Delay_ms(1000);
	}
}
 

STM32 Control relay - Library function version

The library function has packed all the registers , We can use it directly ;
Main code ：

#include "stm32f10x.h" // Device header
#include "Delay.h"

int main(void)
{
    
	GPIO_InitTypeDef GPIO_InitStructure;                        // Defining structure 
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);		// To configure GPIOA Peripheral clock 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;			// To configure GPIOA For universal push-pull output 
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;					// Configure the corresponding port 
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;			// Configure the speed 
	GPIO_Init(GPIOA,&GPIO_InitStructure);						// Transfer the position of the structure 
	while(1)
	{
    
	GPIO_SetBits(GPIOA,GPIO_Pin_11);		// The port is set to high level 
	Delay_ms(1000);			// Time delay 1s
	GPIO_ResetBits(GPIOA,GPIO_Pin_11);		// The port is set to low level 
	Delay_ms(1000);			// Time delay 1s
	}
}

summary

1. The code phenomena of register version and library function version are the same ;
2.IO The port mode should be configured as push-pull output mode , Open drain output mode cannot drive the relay ;
3. This use is 5Ｖ Relay version , Required for power supply 5Ｖ, If the development board does not 5Ｖ　 Input pin , It can be powered by additional power supply , But the ground of the power supply should be connected with the ground of the single chip microcomputer ;