Nick
> I actually have the P2106 board and not the 2106mt
board. I
> originally did not think the problem with the boot loader was
> anything hardware.
>
> I'm not sure if this will sort out the problem with my board, as
> there is no need to have the voltage as high as 12v (as far as i can
> see).
> I will still give this a go though.
unless you shorten the zener Z1, 9VDC will not be enough to make the
3.3V regulator work reliably (9V - 0.7V - 5.1V = 3.2V left for the
regulators, while the minimum dropout voltage of the LM1117 is about
1.1V, thus requiring a minimum of 4.4V to produce 3.3V). So the minimum
DC requirement would be 4.4V + 5.1V + 0.7V = 10.3V for this constellation.
If you shorten Z1 by installing J1, 4.4V + 0.7V = 5.1V min. would be
sufficient.
hth
-uwe
Olimex LPC2106mt bootloader problem
Started by ●February 9, 2006
Reply by ●February 11, 20062006-02-11
Reply by ●February 11, 20062006-02-11
Nick, I did not expect anything like this either... I had a look at the P2106 schematics and apparently it is similar to the mt board in this respect. The same 5V zenerdiode followed by a 3.3V regulator. This regulator feeds the RS232 chip, no RS232 -no bootloader. Both the mt and the P schematics actually say 9VAC, but the documentation says 6VAC 9VDC. Good luck! Anders --- In lpc2000@lpc2..., "nma550n" <nma550n@...> wrote: > > Anders, > > I actually have the P2106 board and not the 2106mt board. I > originally did not think the problem with the boot loader was > anything hardware. > > I'm not sure if this will sort out the problem with my board, as > there is no need to have the voltage as high as 12v (as far as i can > see). > I will still give this a go though. > > You say at 9 v your Tx line is 0v. What is it at 12v? > Just trying to tie things together here. At work at the moment and > can't test things till I get home. > > Thanks for all your help. > > Nick > > --- In lpc2000@lpc2..., "kjellberg_anders" <akj@> wrote: > > > > Nick, > > > > I get 0V on the TX pin at 9V. > > It is clear from the schematic that the board won't work at 9V. I > > was also a bit afraid of upping the voltage as the current > increased > > a lot. The trick is to start at 12V since the regulators draw very > > much current when fed below nominal voltage. After the rectifying > > bridge there is 7805(and the schematic says 12V there!). There is > > also a 1N4733 5V zener-diode. Thus, att 9V there's only 4V left for > > the LM1117 3.3V regulator which has a minimum voltage drop of about > > 1.0-1.2V minimum (4.3-4.5V in). The core may get the correct > voltage > > but the peripherals won't. > > > > Cheers > > /Anders > > > > > > > > > > > > --- In lpc2000@lpc2..., "nma550n" <nma550n@> wrote: > > > > > > Anders, > > > > > > Great to hear you got your board working! I have not tried upping > > the > > > voltage as yet, will give it a try later. The only thing that > > stopped > > > me thinking that the voltage would make any differenct was that > > the > > > board was getting 1.8v for the core and 3.3v for the peripherals. > > > > > > Are you saying it requires 12v for RS232? > > > > > > Also, what is voltage on your Tx pin on the LPC2106 (at default)? > > > Regards, > > > > > > Nick > > > > > > > > > --- In lpc2000@lpc2..., "kjellberg_anders" <akj@> wrote: > > > > > > > > > > > > Nick, > > > > > > > > It actually works now! Olimex states 9VDC/6VAC for powering the > > > > board, but when I had a look at the closer look at the > schematic > > it > > > > became obvious that it should be 12V... Let me know if this > > solves > > > > your problem as well. Otherwise I could post my LPC utility > > > settings. > > > > > > > > regards > > > > /Anders > > > > > > > > > > > > > > > > > > > > --- In lpc2000@lpc2..., "nma550n" <nma550n@> wrote: > > > > > > > > > > Anders, > > > > > > > > > > You had any luck yet? > > > > > > > > > > Cheers, > > > > > > > > > > Nick > > > > > > > > > > --- In lpc2000@lpc2..., "kjellberg_anders" <akj@> > > wrote: > > > > > > > > > > > > > > > > > > Nick, > > > > > > > > > > > > Thanks for letting me know about your LPC 2106 problems. > > Since > > > > I'm > > > > > > working from home today I do not have any other cables but > > I'll > > > > get > > > > > > back to you as soon as I have tried a different one. As I > > wrote > > > > > > earlier, I have tested different baudrates and made sure > > that > > > > the > > > > > > comport was correctly setup. I'll check that with a scope > > > > tomorrow. > > > > > > > > > > > > Best regards > > > > > > /Anders > > > > > > > > > > > > > > > > > > -- In lpc2000@lpc2..., "nma550n" <nma550n@> wrote: > > > > > > > > > > > > > > Anders, > > > > > > > > > > > > > > I am also having problems with the Philips LPC2000 flash > > > > utility > > > > > > > (olimex LPC2106), and was just about to post a message on > > > this > > > > > > board > > > > > > > to see if the problem lies with my development board. > > > > > > > I am just trying to upload the simple blink LED hex file > > to > > > > > flash, > > > > > > > and it just comes up with cannot communicate. I too have > > > tried > > > > > > many > > > > > > > different com ports, jumper settings and different reset > > > > > > conditions, > > > > > > > to no avail. This is the first time I have tried to use > > this > > > > > > board, > > > > > > > so i have no idea if the thing works. > > > > > > > > > > > > > > I am almost certain the problem does not lie with the > > Philips > > > > > > LPC2000 > > > > > > > flash utility as I have scoped out the Rx signal (3.3v > > low, > > > 0v > > > > > > high) > > > > > > > on the board and found it to receive data. > > > > > > > However, my Tx pin on the chip is always at ground and > > does > > > > > > nothing. > > > > > > > > > > > > > > Does anyone know if Tx should be held at 0v??? > > > > > > > > > > > > > > Not sure if this will help you Anders, but just to let > you > > > > know > > > > > > your > > > > > > > not alone. > > > > > > > > > > > > > > cheers, > > > > > > > > > > > > > > Nick > > > > > > > > > > > > > > > --- In lpc2000@lpc2..., "Anders Kjellberg" > > <akj@> > > > > wrote: > > > > > > > > > > > > > > > > > > Hi, > > > > > > > > > I'm trying to establish connection with Philips Flash > > > > Utility > > > > > > and > > > > > > > > an Olimex 2106 mt board without success. TheBSL jumper > > is > > > > > > shorted > > > > > > > > and the frequency set at 14745kHz (14.7456MHz). > > Different > > > > > > baudrates > > > > > > > > have been tried without success. I am not sure about > the > > > > > DTR/RTS > > > > > > > > settings however. Also I may be using the wrong RS232 > > > cable. > > > > > > Null > > > > > > > > modem or not? I'll have to check that. I intend to use > > the > > > > > > > > bootloader and ICCARM. Any ideas that may help? > > > > > > > > > > > > > > > > > > Thanks in advance! > > > > > > > > > /Anders > > > > > > > > > > > > > > > > > > [Non-text portions of this message have been removed] > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >
Reply by ●February 11, 20062006-02-11
Nick, I forgot. There should be a jumper J1 on your board. It shorts the diode! I have not checked the documentation (theres no jumper on my board) but this might be a clue. Check my previous post if you havent already. Anders --- In lpc2000@lpc2..., "kjellberg_anders" <akj@...> wrote: > > Nick, > > I did not expect anything like this either... > I had a look at the P2106 schematics and apparently it is similar to > the mt board in this respect. The same 5V zenerdiode followed by a > 3.3V regulator. This regulator feeds the RS232 chip, no RS232 -no > bootloader. Both the mt and the P schematics actually say 9VAC, but > the documentation says 6VAC 9VDC. > > Good luck! > Anders > > > > --- In lpc2000@lpc2..., "nma550n" <nma550n@> wrote: > > > > Anders, > > > > I actually have the P2106 board and not the 2106mt board. I > > originally did not think the problem with the boot loader was > > anything hardware. > > > > I'm not sure if this will sort out the problem with my board, as > > there is no need to have the voltage as high as 12v (as far as i > can > > see). > > I will still give this a go though. > > > > You say at 9 v your Tx line is 0v. What is it at 12v? > > Just trying to tie things together here. At work at the moment and > > can't test things till I get home. > > > > Thanks for all your help. > > > > Nick > > > > --- In lpc2000@lpc2..., "kjellberg_anders" <akj@> wrote: > > > > > > Nick, > > > > > > I get 0V on the TX pin at 9V. > > > It is clear from the schematic that the board won't work at 9V. > I > > > was also a bit afraid of upping the voltage as the current > > increased > > > a lot. The trick is to start at 12V since the regulators draw > very > > > much current when fed below nominal voltage. After the > rectifying > > > bridge there is 7805(and the schematic says 12V there!). There > is > > > also a 1N4733 5V zener-diode. Thus, att 9V there's only 4V left > for > > > the LM1117 3.3V regulator which has a minimum voltage drop of > about > > > 1.0-1.2V minimum (4.3-4.5V in). The core may get the correct > > voltage > > > but the peripherals won't. > > > > > > Cheers > > > /Anders > > > > > > > > > > > > > > > > > > --- In lpc2000@lpc2..., "nma550n" <nma550n@> wrote: > > > > > > > > Anders, > > > > > > > > Great to hear you got your board working! I have not tried > upping > > > the > > > > voltage as yet, will give it a try later. The only thing that > > > stopped > > > > me thinking that the voltage would make any differenct was > that > > > the > > > > board was getting 1.8v for the core and 3.3v for the > peripherals. > > > > > > > > Are you saying it requires 12v for RS232? > > > > > > > > Also, what is voltage on your Tx pin on the LPC2106 (at > default)? > > > > Regards, > > > > > > > > Nick > > > > > > > > > > > > --- In lpc2000@lpc2..., "kjellberg_anders" <akj@> > wrote: > > > > > > > > > > > > > > > Nick, > > > > > > > > > > It actually works now! Olimex states 9VDC/6VAC for powering > the > > > > > board, but when I had a look at the closer look at the > > schematic > > > it > > > > > became obvious that it should be 12V... Let me know if this > > > solves > > > > > your problem as well. Otherwise I could post my LPC utility > > > > settings. > > > > > > > > > > regards > > > > > /Anders > > > > > > > > > > > > > > > > > > > > > > > > > --- In lpc2000@lpc2..., "nma550n" <nma550n@> wrote: > > > > > > > > > > > > Anders, > > > > > > > > > > > > You had any luck yet? > > > > > > > > > > > > Cheers, > > > > > > > > > > > > Nick > > > > > > > > > > > > --- In lpc2000@lpc2..., "kjellberg_anders" <akj@> > > > wrote: > > > > > > > > > > > > > > > > > > > > > Nick, > > > > > > > > > > > > > > Thanks for letting me know about your LPC 2106 problems. > > > Since > > > > > I'm > > > > > > > working from home today I do not have any other cables > but > > > I'll > > > > > get > > > > > > > back to you as soon as I have tried a different one. As > I > > > wrote > > > > > > > earlier, I have tested different baudrates and made sure > > > that > > > > > the > > > > > > > comport was correctly setup. I'll check that with a > scope > > > > > tomorrow. > > > > > > > > > > > > > > Best regards > > > > > > > /Anders > > > > > > > > > > > > > > > > > > > > > -- In lpc2000@lpc2..., "nma550n" <nma550n@> > wrote: > > > > > > > > > > > > > > > > Anders, > > > > > > > > > > > > > > > > I am also having problems with the Philips LPC2000 > flash > > > > > utility > > > > > > > > (olimex LPC2106), and was just about to post a message > on > > > > this > > > > > > > board > > > > > > > > to see if the problem lies with my development board. > > > > > > > > I am just trying to upload the simple blink LED hex > file > > > to > > > > > > flash, > > > > > > > > and it just comes up with cannot communicate. I too > have > > > > tried > > > > > > > many > > > > > > > > different com ports, jumper settings and different > reset > > > > > > > conditions, > > > > > > > > to no avail. This is the first time I have tried to > use > > > this > > > > > > > board, > > > > > > > > so i have no idea if the thing works. > > > > > > > > > > > > > > > > I am almost certain the problem does not lie with the > > > Philips > > > > > > > LPC2000 > > > > > > > > flash utility as I have scoped out the Rx signal (3.3v > > > low, > > > > 0v > > > > > > > high) > > > > > > > > on the board and found it to receive data. > > > > > > > > However, my Tx pin on the chip is always at ground and > > > does > > > > > > > nothing. > > > > > > > > > > > > > > > > Does anyone know if Tx should be held at 0v??? > > > > > > > > > > > > > > > > Not sure if this will help you Anders, but just to let > > you > > > > > know > > > > > > > your > > > > > > > > not alone. > > > > > > > > > > > > > > > > cheers, > > > > > > > > > > > > > > > > Nick > > > > > > > > > > > > > > > > > --- In lpc2000@lpc2..., "Anders Kjellberg" > > > <akj@> > > > > > wrote: > > > > > > > > > > > > > > > > > > > > Hi, > > > > > > > > > > I'm trying to establish connection with Philips > Flash > > > > > Utility > > > > > > > and > > > > > > > > > an Olimex 2106 mt board without success. TheBSL > jumper > > > is > > > > > > > shorted > > > > > > > > > and the frequency set at 14745kHz (14.7456MHz). > > > Different > > > > > > > baudrates > > > > > > > > > have been tried without success. I am not sure about > > the > > > > > > DTR/RTS > > > > > > > > > settings however. Also I may be using the wrong > RS232 > > > > cable. > > > > > > > Null > > > > > > > > > modem or not? I'll have to check that. I intend to > use > > > the > > > > > > > > > bootloader and ICCARM. Any ideas that may help? > > > > > > > > > > > > > > > > > > > > Thanks in advance! > > > > > > > > > > /Anders > > > > > > > > > > > > > > > > > > > > [Non-text portions of this message have been > removed] > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >
Reply by ●February 13, 20062006-02-13
Anders & Uwe, I have had the jumper installed all the time. The regulators give 1.8 & 3.3v always. I think this is a problem with the board. Can anyone confirm the voltage present on Tx. Cheers Nick --- In lpc2000@lpc2..., "kjellberg_anders" <akj@...> wrote: > > > Nick, > > I forgot. There should be a jumper J1 on your board. It shorts the > diode! I have not checked the documentation (theres no jumper on my > board) but this might be a clue. Check my previous post if you > havent already. > > Anders > > > --- In lpc2000@lpc2..., "kjellberg_anders" <akj@> wrote: > > > > Nick, > > > > I did not expect anything like this either... > > I had a look at the P2106 schematics and apparently it is similar > to > > the mt board in this respect. The same 5V zenerdiode followed by a > > 3.3V regulator. This regulator feeds the RS232 chip, no RS232 -no > > bootloader. Both the mt and the P schematics actually say 9VAC, > but > > the documentation says 6VAC 9VDC. > > > > Good luck! > > Anders > > > > > > > > --- In lpc2000@lpc2..., "nma550n" <nma550n@> wrote: > > > > > > Anders, > > > > > > I actually have the P2106 board and not the 2106mt board. I > > > originally did not think the problem with the boot loader was > > > anything hardware. > > > > > > I'm not sure if this will sort out the problem with my board, as > > > there is no need to have the voltage as high as 12v (as far as i > > can > > > see). > > > I will still give this a go though. > > > > > > You say at 9 v your Tx line is 0v. What is it at 12v? > > > Just trying to tie things together here. At work at the moment > and > > > can't test things till I get home. > > > > > > Thanks for all your help. > > > > > > Nick > > > > > > --- In lpc2000@lpc2..., "kjellberg_anders" <akj@> wrote: > > > > > > > > Nick, > > > > > > > > I get 0V on the TX pin at 9V. > > > > It is clear from the schematic that the board won't work at > 9V. > > I > > > > was also a bit afraid of upping the voltage as the current > > > increased > > > > a lot. The trick is to start at 12V since the regulators draw > > very > > > > much current when fed below nominal voltage. After the > > rectifying > > > > bridge there is 7805(and the schematic says 12V there!). There > > is > > > > also a 1N4733 5V zener-diode. Thus, att 9V there's only 4V > left > > for > > > > the LM1117 3.3V regulator which has a minimum voltage drop of > > about > > > > 1.0-1.2V minimum (4.3-4.5V in). The core may get the correct > > > voltage > > > > but the peripherals won't. > > > > > > > > Cheers > > > > /Anders > > > > > > > > > > > > > > > > > > > > > > > > --- In lpc2000@lpc2..., "nma550n" <nma550n@> wrote: > > > > > > > > > > Anders, > > > > > > > > > > Great to hear you got your board working! I have not tried > > upping > > > > the > > > > > voltage as yet, will give it a try later. The only thing > that > > > > stopped > > > > > me thinking that the voltage would make any differenct was > > that > > > > the > > > > > board was getting 1.8v for the core and 3.3v for the > > peripherals. > > > > > > > > > > Are you saying it requires 12v for RS232? > > > > > > > > > > Also, what is voltage on your Tx pin on the LPC2106 (at > > default)? > > > > > Regards, > > > > > > > > > > Nick > > > > > > > > > > > > > > > --- In lpc2000@lpc2..., "kjellberg_anders" <akj@> > > wrote: > > > > > > > > > > > > > > > > > > Nick, > > > > > > > > > > > > It actually works now! Olimex states 9VDC/6VAC for > powering > > the > > > > > > board, but when I had a look at the closer look at the > > > schematic > > > > it > > > > > > became obvious that it should be 12V... Let me know if > this > > > > solves > > > > > > your problem as well. Otherwise I could post my LPC > utility > > > > > settings. > > > > > > > > > > > > regards > > > > > > /Anders > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > --- In lpc2000@lpc2..., "nma550n" <nma550n@> wrote: > > > > > > > > > > > > > > Anders, > > > > > > > > > > > > > > You had any luck yet? > > > > > > > > > > > > > > Cheers, > > > > > > > > > > > > > > Nick > > > > > > > > > > > > > > --- In lpc2000@lpc2..., "kjellberg_anders" > <akj@> > > > > wrote: > > > > > > > > > > > > > > > > > > > > > > > > Nick, > > > > > > > > > > > > > > > > Thanks for letting me know about your LPC 2106 > problems. > > > > Since > > > > > > I'm > > > > > > > > working from home today I do not have any other cables > > but > > > > I'll > > > > > > get > > > > > > > > back to you as soon as I have tried a different one. > As > > I > > > > wrote > > > > > > > > earlier, I have tested different baudrates and made > sure > > > > that > > > > > > the > > > > > > > > comport was correctly setup. I'll check that with a > > scope > > > > > > tomorrow. > > > > > > > > > > > > > > > > Best regards > > > > > > > > /Anders > > > > > > > > > > > > > > > > > > > > > > > > -- In lpc2000@lpc2..., "nma550n" <nma550n@> > > wrote: > > > > > > > > > > > > > > > > > > Anders, > > > > > > > > > > > > > > > > > > I am also having problems with the Philips LPC2000 > > flash > > > > > > utility > > > > > > > > > (olimex LPC2106), and was just about to post a > message > > on > > > > > this > > > > > > > > board > > > > > > > > > to see if the problem lies with my development board. > > > > > > > > > I am just trying to upload the simple blink LED hex > > file > > > > to > > > > > > > flash, > > > > > > > > > and it just comes up with cannot communicate. I too > > have > > > > > tried > > > > > > > > many > > > > > > > > > different com ports, jumper settings and different > > reset > > > > > > > > conditions, > > > > > > > > > to no avail. This is the first time I have tried to > > use > > > > this > > > > > > > > board, > > > > > > > > > so i have no idea if the thing works. > > > > > > > > > > > > > > > > > > I am almost certain the problem does not lie with > the > > > > Philips > > > > > > > > LPC2000 > > > > > > > > > flash utility as I have scoped out the Rx signal > (3.3v > > > > low, > > > > > 0v > > > > > > > > high) > > > > > > > > > on the board and found it to receive data. > > > > > > > > > However, my Tx pin on the chip is always at ground > and > > > > does > > > > > > > > nothing. > > > > > > > > > > > > > > > > > > Does anyone know if Tx should be held at 0v??? > > > > > > > > > > > > > > > > > > Not sure if this will help you Anders, but just to > let > > > you > > > > > > know > > > > > > > > your > > > > > > > > > not alone. > > > > > > > > > > > > > > > > > > cheers, > > > > > > > > > > > > > > > > > > Nick > > > > > > > > > > > > > > > > > > > --- In lpc2000@lpc2..., "Anders Kjellberg" > > > > <akj@> > > > > > > wrote: > > > > > > > > > > > > > > > > > > > > > > Hi, > > > > > > > > > > > I'm trying to establish connection with Philips > > Flash > > > > > > Utility > > > > > > > > and > > > > > > > > > > an Olimex 2106 mt board without success. TheBSL > > jumper > > > > is > > > > > > > > shorted > > > > > > > > > > and the frequency set at 14745kHz (14.7456MHz). > > > > Different > > > > > > > > baudrates > > > > > > > > > > have been tried without success. I am not sure > about > > > the > > > > > > > DTR/RTS > > > > > > > > > > settings however. Also I may be using the wrong > > RS232 > > > > > cable. > > > > > > > > Null > > > > > > > > > > modem or not? I'll have to check that. I intend to > > use > > > > the > > > > > > > > > > bootloader and ICCARM. Any ideas that may help? > > > > > > > > > > > > > > > > > > > > > > Thanks in advance! > > > > > > > > > > > /Anders > > > > > > > > > > > > > > > > > > > > > > [Non-text portions of this message have been > > removed] > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >
Reply by ●February 13, 20062006-02-13
Nick,
> Can anyone confirm the voltage present on Tx.
out of reset, the TX pin is at 'low' level on my board
with the BSL jumper installed.
If I then issue a "read device id" command from within
the LPC200 flash utility, theres some traffic on the line
and the utility reports the part id read successfully.
TX is high afterwards.
If I then reset the board again, TX goes back to low
and the next "Read device ID" fails, leaving TX in high
state.
The next "Read device ID" then is again successful, even
if ignoring the request to reset the board.
So, if your TX stays low, no matter what you do, I guess
you have a faulty board, either controller damaged, line
shortened or transceiver damaged.
I'd inspect the soldering to see if there are some shorts,
especially the "expansion" connector, that carries TXD0
next to GND.
hth
-uwe
Reply by ●February 13, 20062006-02-13
uwe,
Thanks man, that has helped alot. Will check it out later.
Nick
--- In lpc2000@lpc2..., "Uwe Arends" <nospam@...> wrote:
>
> Nick,
>
> > Can anyone confirm the voltage present on Tx.
>
> out of reset, the TX pin is at 'low' level on my board
> with the BSL jumper installed.
> If I then issue a "read device id" command from within
> the LPC200 flash utility, theres some traffic on the line
> and the utility reports the part id read successfully.
> TX is high afterwards.
> If I then reset the board again, TX goes back to low
> and the next "Read device ID" fails, leaving TX in high
> state.
> The next "Read device ID" then is again successful, even
> if ignoring the request to reset the board.
>
> So, if your TX stays low, no matter what you do, I guess
> you have a faulty board, either controller damaged, line
> shortened or transceiver damaged.
> I'd inspect the soldering to see if there are some shorts,
> especially the "expansion" connector, that carries TXD0
> next to GND.
>
> hth
> -uwe
>
Reply by ●February 14, 20062006-02-14
Uwe & Nick,
I have the same experience as Uwe. I would check the TX line on the
low level side of the ST3232(pin 11). Other than that you could
perhaps try a JTAG interface before throwing the poor board away.
Anders
--- In lpc2000@lpc2..., "nma550n" <nma550n@...> wrote:
>
> uwe,
>
> Thanks man, that has helped alot. Will check it out later.
>
> Nick
>
> --- In lpc2000@lpc2..., "Uwe Arends" <nospam@> wrote:
> >
> > Nick,
> >
> > > Can anyone confirm the voltage present on Tx.
> >
> > out of reset, the TX pin is at 'low' level on my board
> > with the BSL jumper installed.
> > If I then issue a "read device id" command from within
> > the LPC200 flash utility, theres some traffic on the line
> > and the utility reports the part id read successfully.
> > TX is high afterwards.
> > If I then reset the board again, TX goes back to low
> > and the next "Read device ID" fails, leaving TX in high
> > state.
> > The next "Read device ID" then is again successful, even
> > if ignoring the request to reset the board.
> >
> > So, if your TX stays low, no matter what you do, I guess
> > you have a faulty board, either controller damaged, line
> > shortened or transceiver damaged.
> > I'd inspect the soldering to see if there are some shorts,
> > especially the "expansion" connector, that carries TXD0
> > next to GND.
> >
> > hth
> > -uwe
> >
>
