Posted: Fri May 02, 2014 5:25 pm Post subject: Config 1WIRE PORT-PIN ?
Hello. My friend can`t read DS18B20 on PORTD.0 in ATmega16 (ressistor attached)
Program run on test board on PORTD.7 successfully but don`t work on target board.
PORTD.0 is a RXD for RS232 but nothing is received or send in programm.
In my projects I always config all ports on beginning and set as Input for 1WIRE and its work. Then Config 1WIRE as PIND.0 not PORTD.0
Today I read help file and 1WIRE is config as PORT not PIN.
If anyone have experience of that diffrences tell me :D
the official syntax is to use a port but pin is accepted too.
the problem is when you enable rs232 (using $baud, print etc) the tx and rx pins are enabled for rs232.
so when you do not need RX you need to disable it in the uart control register : UCSR0B.7=0 'register name depends on the chip
most chips have an alias named UCR so use : UCR.7=0 to deactivate TX : UCR.6=0 _________________ Mark
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and 1WIRE is config as PORT not PIN.
