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矩阵键盘KEY4*4通过USART3(串口3)输出

程序员文章站 2022-04-01 15:44:40
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矩阵键盘通过串口输出

主程序

头文件添加
#include "sys.h"
#include "KEY44.h"
#include "delay.h"
#include "USART3.h"
#include "stdio.h"
#include "string.h"

键盘与串口初始化
u8 key_num = 0;
int main(void)
{
	USART3_Init(115200);
	delay_init();
	KEY44_Init();

键盘扫描并且输出	
	while(1)
	{
		key_num = key44_Scan();
		if(key_num != 0)
	{
			printf("KEY NUM IS %d\r\n",key_num);
	}	
	}
 
}
#include "KEY44.h"
#include "sys.h"
#include "delay.h"


//PA0~PA3为推挽式输出
//PA4~PA7为上拉输入

KEY44结构体声明
void  KEY44_Init(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 |GPIO_Pin_1 |GPIO_Pin_2 |GPIO_Pin_3 ;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 |GPIO_Pin_5 |GPIO_Pin_6 |GPIO_Pin_7 ;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	
}
key44键盘扫面
unsigned char key44_Scan(void)
{
	H_1 = 0;
	H_2 = 1;
	H_3 = 1;
	H_4 = 1;

	if(L_1 == 0)
	{
		delay_ms(10);
		if(L_1 == 0)
		{
			while(!L_1);
			return 1;
		}
	}
	if(L_2 == 0)
	{
		delay_ms(10);
		if(L_2 == 0)
		{
			while(!L_2);
			return 2;
		}
	}
	if(L_3 == 0)
	{
		delay_ms(10);
		if(L_3 == 0)
		{
			while(!L_3);
			return 3;
		}
	}
	if(L_4 == 0)
	{
		delay_ms(10);
		if(L_4 == 0)
		{
			while(!L_4);
			return 4;
		}
	}

	H_1 = 1;
	H_2 = 0;
	H_3 = 1;
	H_4 = 1;

	if(L_1 == 0)
	{
		delay_ms(10);
		if(L_1 == 0)
		{
			while(!L_1);
			return 5;
		}
	}
	if(L_2 == 0)
	{
		delay_ms(10);
		if(L_2 == 0)
		{
			while(!L_2);
			return 6;
		}
	}
	if(L_3 == 0)
	{
		delay_ms(10);
		if(L_3 == 0)
		{
			while(!L_3);
			return 7;
		}
	}
	if(L_4 == 0)
	{
		delay_ms(10);
		if(L_4 == 0)
		{
			while(!L_4);
			return 8;
		}
	}

	H_1 = 1;
	H_2 = 1;
	H_3 = 0;
	H_4 = 1;

	if(L_1 == 0)
	{
		delay_ms(10);
		if(L_1 == 0)
		{
			while(!L_1);
			return 9;
		}
	}
	if(L_2 == 0)
	{
		delay_ms(10);
		if(L_2 == 0)
		{
			while(!L_2);
			return 10;
		}
	}
	if(L_3 == 0)
	{
		delay_ms(10);
		if(L_3 == 0)
		{
			while(!L_3);
			return 11;
		}
	}
	if(L_4 == 0)
	{
		delay_ms(10);
		if(L_4 == 0)
		{
			while(!L_4);
			return 12;
		}
	}

	H_1 = 1;
	H_2 = 1;
	H_3 = 1;
	H_4 = 0;

	if(L_1 == 0)
	{
		delay_ms(10);
		if(L_1 == 0)
		{
			while(!L_1);
			return 13;
		}
	}
	if(L_2 == 0)
	{
		delay_ms(10);
		if(L_2 == 0)
		{
			while(!L_2);
			return 14;
		}
	}
	if(L_3 == 0)
	{
		delay_ms(10);
		if(L_3 == 0)
		{
			while(!L_3);
			return 15;
		}
	}
	if(L_4 == 0)
	{
		delay_ms(10);
		if(L_4 == 0)
		{
			while(!L_4);
			return 16;
		}
	}
	return 0;
}
#include "USART3.h"
#include "stdio.h"

//重定义fputc函数 
int fputc(int ch, FILE *f)
{      
	while((USART3->SR&0X40)==0); //循环发送,直到发送完毕   
    USART3->DR = (u8) ch;      
	return ch;
}

串口管脚设置
void USART3_Init(u32 bound)
{

	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	//开启用GPIOB和复用功能的时钟
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO,ENABLE);
	//开启USART3的时钟
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);
	//PB10->TX 配置为复用推挽式输出
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_Init(GPIOB, &GPIO_InitStructure);
	//PB11->RX 配置为浮空输入
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
	GPIO_Init(GPIOB, &GPIO_InitStructure);

	
	USART_InitStructure.USART_BaudRate = bound;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
	USART_InitStructure.USART_StopBits = USART_StopBits_1;
	USART_InitStructure.USART_Parity = USART_Parity_No;
	USART_InitStructure.USART_HardwareFlowControl =USART_HardwareFlowControl_None;
	USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
	USART_Init(USART3, &USART_InitStructure);
	
	USART_Cmd(USART3,ENABLE);
	
	USART_ClearFlag (USART3 ,USART_FLAG_TC);
}

下面是图片显示效果

矩阵键盘KEY4*4通过USART3(串口3)输出




相关标签: key usart