GN1650按键检测不到，ACK一直高电平

逍遥1 · 发表于 2021-6-22 20:50:55

unsigned char TM1650_Read_KEY(void)
{
unsigned char temp;
  TM1650_Start();
TM1650_Send_Byte(0x49);
TM1650_Wait_Ack();
temp=TM1650_Read_Byte();
TM1650_Wait_Ack();
TM1650_Stop();
return temp;
}
void TM1650_delay_us(unsigned short j)
{
  unsigned short i,k;
  for(k=0;k<j;k++)
  {
for(i=0;i<1;i++)
{
}
  }
}

void TM1650_Start(void)
{
SDA_OUT();
TM1650_SDA_H;
TM1650_SCL_H;
TM1650_delay_us(4);
   TM1650_SDA_L;
TM1650_delay_us(4);
TM1650_SCL_L;
}

void TM1650_Stop(void)
{
SDA_OUT();
TM1650_SCL_L;
TM1650_SDA_L;
   TM1650_delay_us(4);
TM1650_SCL_H;
TM1650_delay_us(4);
TM1650_SDA_H;
}

unsigned char  TM1650_Wait_Ack(void)
{
unsigned char  ucErrTime=0;
SDA_IN();
TM1650_SDA_H;TM1650_delay_us(1);
TM1650_SCL_H;TM1650_delay_us(1);
while(READ_SDA)
{
      ucErrTime++;
      if(ucErrTime>250)
      {
         TM1650_Stop();
         return 1;
      }
}
TM1650_SCL_L;
return 0;
}

void TM1650_Ack(void)
{
TM1650_SCL_L;
SDA_OUT();
TM1650_SDA_L;
TM1650_delay_us(4);
TM1650_SCL_H;
TM1650_delay_us(4);
TM1650_SCL_L;
}

void TM1650_NAck(void)
{
TM1650_SCL_L;
SDA_OUT();
TM1650_SDA_H;
TM1650_delay_us(4);
TM1650_SCL_H;
TM1650_delay_us(4);
TM1650_SCL_L;
}

void TM1650_Send_Byte(unsigned char  oneByte)
{
unsigned char  t;
SDA_OUT();
TM1650_SCL_L;
for(t=0;t<8;t++)
{
         if((oneByte&0x80)==0x80)
         {
            TM1650_SDA_H;
         }
         else
         {
            TM1650_SDA_L;
         }
         oneByte<<=1;
         TM1650_delay_us(4);
         TM1650_SCL_H;
         TM1650_delay_us(4);
         TM1650_SCL_L;
         TM1650_delay_us(4);
}
}

unsigned char  TM1650_Read_Byte(void)
{
unsigned char i,rekey=0;
SDA_IN();
for(i=0;i<8;i++ )
{
      TM1650_SCL_L;
      TM1650_delay_us(4);
      TM1650_SCL_H;
      rekey<<=1;
      if(READ_SDA) rekey++;
      TM1650_delay_us(4);
}
return rekey;
}
unsigned char TM1650_Read_KEY(void)
{
unsigned char temp;
  TM1650_Start();
TM1650_Send_Byte(0x49);
TM1650_Wait_Ack();
temp=TM1650_Read_Byte();
TM1650_Wait_Ack();
TM1650_Stop();
return temp;
}

uint32_t TM1650_Gte_KEY(void)
{
unsigned char key;
uint32_t key_name,i,j;
key=TM1650_Read_KEY();
for(i=0;i<7;i++)
      for(j=0;j<7;j++)
      {
         if(key == key_numberH[i][j])
         {
            key_name = key_number[i][j];
            return key_name;
         }
      }

return key_name;
}

那位大神知道我这个程序哪里有问题，程序运行到ACK，SDA脚一直是高电平。芯片是GN1650