矩阵键盘KEY4*4通过USART3(串口3)输出
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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