stm32 +tm1638 只能显示，不能读键为何？

2019-03-23 17:28发布

stm32 +tm1638 只能显示，不能读键为何？那地方出了问题求大神指点。相关代码如下：
void TM1638_Write(unsigned char       DATA)                      //D′êy¾Yoˉêy
{
      unsigned char i;
      for(i=0;i<8;i++)
      {
            CLK=0;
            if(DATA&0X01)
                     DIO=1;
            else
                     DIO=0;
            DATA>>=1;
            CLK=1;
      }
}
unsigned char TM1638_Read(void)                                     //¶áêy¾Yoˉêy
{
      unsigned char i;
      unsigned char temp=0;
      DIO=1;       //éèÖÃÎaêäèë
      for(i=0;i<8;i++)
      {
      delay_us(5)       ;
            temp>>=1;
            CLK=0;
            if(DIO)
                     temp|=0x80;
            CLK=1;
      }
      return temp;
}
void Write_COM(unsigned char cmd)             //·￠ËíÃüáî×Ö
{
      STB=0;
      TM1638_Write(cmd);
      STB=1;
}

unsigned char Read_key(void)
{
      unsigned char c[4],i,key_value=0;
      STB=0;
            delay_ms(100);
      TM1638_Write(0x42);
      delay_ms(100);
      for(i=0;i<4;i++)
            {
                     c=TM1638_Read();
            }
      STB=1;                                     //4¸ö×Ö½úêy¾YoÏ3éò»¸ö×Ö½ú
      if(c[0]==0x04) key_value=1;
      if(c[0]==0x40) key_value=2;
      if(c[1]==0x04) key_value=3;
      if(c[1]==0x40) key_value=4;
      if(c[2]==0x04) key_value=5;
      if(c[2]==0x40) key_value=6;
      if(c[3]==0x04) key_value=7;
      if(c[3]==0x40) key_value=8;
      if(c[0]==0x02) key_value=9;
      if(c[0]==0x20) key_value=10;
      if(c[1]==0x02) key_value=11;
      if(c[1]==0x20) key_value=12;
      if(c[2]==0x02) key_value=13;
      if(c[2]==0x20) key_value=14;
      if(c[3]==0x02) key_value=15;
      if(c[3]==0x20) key_value=16;
      return (key_value);
}
网上的代码，显示没问题。
while (1)
                     {
      LedDisplay(1,3,7,0,2,1,0,2);
      delay_ms(1000);
            key_value=Read_key();
      switch (key_value)
      {
            case 1:
            LedDisplay(1,0,0,0,0,0,0,0);
            break;
            case 2 :
            LedDisplay(2,0,0,0,0,0,0,0);
            break;
            case 3 :
            LedDisplay(3,0,0,0,0,0,0,0);
            break;
            case 4 :
            LedDisplay(4,0,0,0,0,0,0,0);
            break;
            case 5 :
            LedDisplay(5,0,0,0,0,0,0,0);
            break;
            case 6 :
            LedDisplay(6,0,0,0,0,0,0,0);
            break;
            case 7 :
            LedDisplay(7,0,0,0,0,0,0,0);
            break;
            case 8 :
            LedDisplay(8,0,0,0,0,0,0,0);
            break;
            case 9:
            LedDisplay(9,0,0,0,0,0,0,0);
            break;
            case 10 :
            LedDisplay(0,1,0,0,0,0,0,0);
            break;
            case 11 :
            LedDisplay(1,1,0,0,0,0,0,0);
            break;
            case 12 :
            LedDisplay(2,1,0,0,0,0,0,0);
            break;
            case 13 :
            LedDisplay(3,1,0,0,0,0,0,0);
            break;
            case 14 :
            LedDisplay(4,1,0,0,0,0,0,0);
            break;
            case 15:
            LedDisplay(5,1,0,0,0,0,0,0);
            break;
            case 16 :
            LedDisplay(6,1,0,0,0,0,0,0);
            break;
            default :
            break;//LedDisplay(0,0,0,0,0,0,0,0);
      }




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