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unsigned char AD_Read()
{
unsigned char tmp;
iic_start();
iic_send_byte(0x90);
if(0 == ack)
{
return ERR;
}
iic_send_byte(0x40);
if(0 == ack)
{
return ERR;
}
iic_start();
iic_send_byte(0x91);
if(0 == ack)
{
return ERR;
}
tmp = iic_rev_byte();
iic_noack();
iic_stop();
return tmp;
}