STM32单片机矩阵键盘

ID:949309 · 发表于 2022-4-28 15:54

#include "matrix_key.h"
#include "stm32f10x.h"
#include "delay.h"

void KEYPad_Init1(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOF, ENABLE);//开启时钟,使能GPIOB时钟

      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;       //上拉输入 B0-B3
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOF, &GPIO_InitStructure);

      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;       //下拉输入 F4-B7
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOF, &GPIO_InitStructure);
}

void KEYPad_Init2(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOF, ENABLE);//开启时钟,使能GPIOB时钟

      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;       //下拉输入 B0-B3
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOF, &GPIO_InitStructure);

      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;       //上拉输入 B4-B7
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOF, &GPIO_InitStructure);
}

int KEYPAD_Scan()
{
      static u16 keyvalue = 0;
      u32 readvalue = 0;
      KEYPad_Init1();
      readvalue = GPIO_ReadInputData(GPIOF);
      readvalue &= 0x00ff;
      //return readvalue;



      if(readvalue != 0x000f)
      {
            delay_ms(8);//消抖10ms
            if(readvalue != 0x000f)
            {
                     readvalue = GPIO_ReadInputData(GPIOF);//再次读取状态
                     readvalue &= 0x00ff;
                     //return readvalue;
                     switch(readvalue)
                     {
                              case (0x001f):keyvalue = 0;break;
                              case (0x002f):keyvalue = 1;break;
                              case (0x004f):keyvalue = 2;break;
                              case (0x008f):keyvalue = 3;break;
                     }
                     //return readvalue;
                     KEYPad_Init2();
                     delay_ms(5);
                     readvalue = GPIO_ReadInputData(GPIOF);//再次读取状态
                     readvalue |= 0x00f0;
                     readvalue &= 0x00ff;
                     //return readvalue;
                     switch(readvalue)
                     {
                              case (0x00f1):keyvalue += 0;break;
                              case (0x00f2):keyvalue += 4;break;
                              case (0x00f4):keyvalue += 8;break;
                              case (0x00f8):keyvalue += 12;break;
                     }

                     while(readvalue != 0x00f0)//检测按键松开
                     {
                              readvalue = GPIO_ReadInputData(GPIOF);//再次读取状态
                              readvalue |= 0x00f0;
                              readvalue &= 0x00ff;
                     }
                     //return readvalue;
            }
      }
      return keyvalue;
}

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