矩阵键盘通过串口3输出

USART.c文件

#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;
}
void USART3_Init(u32 bound)
{
GPIO_InitTypeDef GPIO_InitStructure;
 USART_InitTypeDef USART_InitStructure;
    //开启GPIOB和复用功能的时钟
 RCC_APB1PeriphClockCmd(RCC_APB2Periph_GPIOB |RCC_APB2Periph_AFIO,ENABLE);

 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);//解决发送第一个字节丢失的问题

}

矩阵键盘.c文件

#include "KEY44.h"
#include "sys.h"
#include "delay.h"


//PA0~PA3 为推挽式输出
//PA4~PA7 为上拉输入


void  KEY44_Init(void)
{
 GPIO_InitTypeDef GPIO_InitStructure;//结构体声明

 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); 
 
}
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;
}

主函数

#include "sys.h"
#include "USART3.h"
#include "KEY44.h"
#include "delay.h"
#include "string.h"
#include "stdio.h"


u8 key_num = 0;




int main()
{
   USART3_Init(115200);
delay_init();
KEY44_Init();

//键盘扫入并输出
while(1)
{
key_num = key44_Scan();
if(key_num != 0)
{
printf("KEY NUM IS %d\r\n",key_num);
}
}

}

下面是实证照片