Serial port question
mlobo at digiart.art.br
Wed Jan 30 17:17:20 PST 2008
On Wednesday 30 January 2008 21:42:28 you wrote:
> On Wed, 30 Jan 2008, Mario Lobo wrote:
> > I am doing some experiments with the WL5460AP. I doesn't have a serial
> > connector but the RTL8186 does have a UART and the circuit board has a 4
> > pin connector (4-3.3V, 3-TXD, 2-RXD, 1-GND) to the UART. The idea here is
> > to rewrite its firmware.
> You may have to swap TXD and RXD (null-modem).
I tried that.
> > For a better debuging (and possibly de-bricking), I need to access its
> > console screen (which it DOES have).
> > The (lots of) info I gathered says that the connection to the WL5460AP
> > console should be at 38400, 8N1, no-flow ctl.
> > I have set up a proper cable and a line in /etc/ttys like:
> > ttyd0 "/usr/libexec/getty 3wire.38400" vt100 on secure
> I would set that back to default. /dev/cuad0 is the callout port.
I'll try that.
> > Using kermit I type:
> > SET CARRIER-WATCH OFF
> > set duplex full
> > set session-log binary
> > set modem type none
> > set line /dev/ttyd0
> > set speed 38400
> > set flow none
> > set serial 8n1
> > set terminal echo local
> > set terminal newline-mode on
> > set terminal debug on
> > connect
> > but I get nothing back.
> Try again with /dev/cuad0. Again, you may have to reverse TXD and RXD
> at one end of the cable.
> > Before I start digging for hardware errors, I want to check if my
> > connection attempt is being done right and understand better what is
> > going on.
> > 1) how does this work? ttyd0 goes "through" cuad0 or does it simply
> > "grabs it" and sets its speed to 38400. Originally, cuad0 is set to 9600.
> See sio(4). ttyd0 is a "callin" port, while cuad0 is a "callout" port.
> > 2) if it goes "through" cuad0, how do I set it to 38400, 8N1, no-flow
> > ctl?
> You're telling kermit to set the speed and flow control. For this
> application, you could probably use cu/tip also:
> cu -l /dev/cuad0 -s 38400
I tried that. It says "connected" and hangs. I have to open another console to
kill -9 it
> > 3) is my ttys line correct?
> I don't think so.
> -Warren Block * Rapid City, South Dakota USA
Warren, I found this discussion on the inet.
Could you comment on it?
Maybe my plans to access the serial port will have to wait.
I know my cuad0 is ok because I can fax with an external Genius modem.
Thanks for replying !
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