1-Wire

[explorinova]

Posted on April 24, 2012 at 20:28

The

1-wire

protocol

uses only

one

port to send

and receive data.

 What is

 the

configuration mode

for the

GPIO_Mode

?

What is the

method to

a

port to

receive and

send data

?

[Tesla DeLorean]

Posted on April 24, 2012 at 22:50

For a software implementation you'd want to configure the GPIO in Open Drain mode.

[simonlee0311]

Posted on April 25, 2012 at 03:56

Hi,

In my experience, I will do like this.

1. Mater -> Slaver

> Set GPIO as output to send out the data.

After send out finished.

2. Master <- Slaver

> Set GPIO as input to receive data from slaver.

repeat from step 1.

You should define the protocol fist, then you will know how to set GPIO.

Simon 

[trevor23]

Posted on April 25, 2012 at 10:29

Needs to be open drain (as Clive said) rather than output (push/pull) as another one wire device(s) may try to transmit at the same time (i.e. a collision). All devices on the bus should be open drain or open collector (sometimes with dynamic pull up).

[emalund]

Posted on April 30, 2012 at 15:03

Needs to be open drain (as Clive said) rather than output (push/pull) as another one wire device(s) may try to transmit at the same time (i.e. a collision) OR even a popped chip

Erik

[emalund]

Posted on April 30, 2012 at 15:04

Needs to be open drain (as Clive said) rather than output (push/pull) as another one wire device(s) may try to transmit at the same time (i.e. a collision) OR even a popped chip

Erik