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uint8_t Read_Key()
{
uint8_t i=0;
uint8_t key1=0;
uint16_t key2=0;
Write_Cmd(0x42);
Set(DIO); //this is obligatory, check the data sheet,GPIO
for(i=0;i<4;i++)
{
key1=Read_Byte();
key2|=(key1<<i);
}
key2>>=1;
for(i=0;i<8;i++)
{
if(0x01<<i==key2)return i+1;
}
return 0;
}
/***********************************************************************************************
*Function Name: TM1638_SendData
*Purpose : Write data to the location specified
*params : i ------the bit code of digtal tube,0 to 7
str ------the string,the char which was not in tm_data will be replace with "''".
*return : none
***********************************************************************************************/
void TM1638_SendData(uint8_t i,uint8_t * str){
int j=0,k=0;
unsigned char chr;
for(;i<8;i++)
{
k=0;
for(j=0;j<14;j++)
{
if(*str==tm_dat[0][j])
{
chr=tm_dat[1][j];
k=1;
break;
}
}
if(k==0)
{
chr=0x00;
}
if(*(str+1)=='.')
{
chr|=0x80;
Write_Dat(i*2,chr);
str++;
}else
{
Write_Dat(i*2,chr);
}
str++;
if(*str=='\0')break;
}
}
這個TM1638_SendData看不懂啊，怎么用？

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