[STM32 learning] (4) press the key to control the flow light

Learning single-chip microcomputer should learn water lamp , Because the running water lamp is relatively simple , Easy to implement , The effect is also better .

This time, the water light is controlled by pressing the key , Press the key once to start the running water lamp , The use of buttons , It is essential in the development of SCM .

The model of single chip microcomputer I use here is STM32F103VET

8 individual LED The light is connected PA The lower eight places of mouth .

Be careful ：

1. Turn on GPIOA and GPIOB The clock of

2. Set up GPIOA Working mode of port , and GPIOB Working mode of port

          GPIOA：

                 1） open 0-7  IO mouth

                 2） Set up 8 Each port is a push-pull output

                 3） Speed is 50MHz

          GPIOB：（ Connect with the key ）

                1） Set up 0 mouth

                2） Enter... For pull-up

The project layout is shown below ：

The code is also relatively simple , The code is as follows ：（ I didn't modularize the code here , Only in main Function , Easy for beginners to understand , Later code will gradually modularize ）

#include "stm32f10x.h"                  // Device header
#include "stm32f10x_gpio.h"

void delay(void);
int main(void)
{
	unsigned char temp=0XF0;
	RCC_DeInit();	//	 Add peripherals RCC Register reset to default 
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);	//	 To enable or disable APB2 Peripheral clock 
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
	GPIO_InitTypeDef GPIO_InitStruct;	//	 Defining structure   Contains peripherals GPIO Configuration information 	
	GPIO_DeInit(GPIOA);		//	 Add peripherals GPIOA Register reset to default 
	GPIO_DeInit(GPIOB);
	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;	//   Select low 8 For pin 
	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;	//	 Push pull output 
	GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;	//	 Maximum output rate 50MHz
	GPIO_Init(GPIOA,&GPIO_InitStruct);	//	 according to GPIO_InitStruct The parameter specified in GPIOA register 
	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPU;
	GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB,&GPIO_InitStruct);
	
	GPIO_Write(GPIOA,0X00F0);
	while(1)
	{
		if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_0) == 0)	//	 Check that the key is pressed 
		{
			delay();	//	 Desquamation 
			if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_0) == 0)	//	 Judge whether the key is pressed again 
			{
				temp = ~temp;
				GPIO_Write(GPIOA,temp);
				while(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_0) == 0);		//	 Switch release detection 
			}
		}
	}
}

void delay(void)
{
	int i,j;
	for(i=0;i<400;i++)
	{
		for(j=0;j<400;j++);
	}
}

The effect is water lamp , Please test yourself .

Code link , In fact, the code has been posted above , You don't need to download points .

https://download.csdn.net/download/xiaocaidayong/11884602