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Discussion Groups | LPC2000 | Re: JTAG is no working in LPC2387..
Discussion group dedicated to the Philips LPC2000 family of ARM MCUs
JTAG is no working in LPC2387.. - bilgicini - Jun 14 6:27:38 2008
I designed a small simple board using LPC2387. However, JTAG interface
does not respond to my Wiggler clone. I watched the signals and found
that all TDI, TMS, TRST, TCK signals are present but TDO signal coming
from LPC stays high -I think it is also because of pull up resistor I
placed.
What might be missing? Am I missing to connect some pins to somewhere
to enable the JTAG interface? Or a sequence on boot?
PS: I am really disappointed by Philips' documentation again. I say
again because I've used their different sets of components including
thousands of EURO price tagged xray units. The problem was the same
and the missing information was filled by a lot of talking. When I
started using NXP there I was an afraid of documentation, and I have
more now. I used STR's chips and following the documents my design
just worked at first trial. However for LPC2387 there is unbelievably
small subset of insufficient documents..
------------------------------------
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
does not respond to my Wiggler clone. I watched the signals and found
that all TDI, TMS, TRST, TCK signals are present but TDO signal coming
from LPC stays high -I think it is also because of pull up resistor I
placed.
What might be missing? Am I missing to connect some pins to somewhere
to enable the JTAG interface? Or a sequence on boot?
PS: I am really disappointed by Philips' documentation again. I say
again because I've used their different sets of components including
thousands of EURO price tagged xray units. The problem was the same
and the missing information was filled by a lot of talking. When I
started using NXP there I was an afraid of documentation, and I have
more now. I used STR's chips and following the documents my design
just worked at first trial. However for LPC2387 there is unbelievably
small subset of insufficient documents..
------------------------------------
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
Re: JTAG is no working in LPC2387.. - Leon - Jun 14 7:08:05 2008
----- Original Message -----
From: "bilgicini"
To:
Sent: Saturday, June 14, 2008 9:02 AM
Subject: [lpc2000] JTAG is no working in LPC2387..
>I designed a small simple board using LPC2387. However, JTAG interface
> does not respond to my Wiggler clone. I watched the signals and found
> that all TDI, TMS, TRST, TCK signals are present but TDO signal coming
> from LPC stays high -I think it is also because of pull up resistor I
> placed.
>
> What might be missing? Am I missing to connect some pins to somewhere
> to enable the JTAG interface? Or a sequence on boot?
>
> PS: I am really disappointed by Philips' documentation again. I say
> again because I've used their different sets of components including
> thousands of EURO price tagged xray units. The problem was the same
> and the missing information was filled by a lot of talking. When I
> started using NXP there I was an afraid of documentation, and I have
> more now. I used STR's chips and following the documents my design
> just worked at first trial. However for LPC2387 there is unbelievably
> small subset of insufficient documents..
Does the JTAG I/F work with a known functioning board?
Leon
------------------------------------
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
From: "bilgicini"
To:
Sent: Saturday, June 14, 2008 9:02 AM
Subject: [lpc2000] JTAG is no working in LPC2387..
>I designed a small simple board using LPC2387. However, JTAG interface
> does not respond to my Wiggler clone. I watched the signals and found
> that all TDI, TMS, TRST, TCK signals are present but TDO signal coming
> from LPC stays high -I think it is also because of pull up resistor I
> placed.
>
> What might be missing? Am I missing to connect some pins to somewhere
> to enable the JTAG interface? Or a sequence on boot?
>
> PS: I am really disappointed by Philips' documentation again. I say
> again because I've used their different sets of components including
> thousands of EURO price tagged xray units. The problem was the same
> and the missing information was filled by a lot of talking. When I
> started using NXP there I was an afraid of documentation, and I have
> more now. I used STR's chips and following the documents my design
> just worked at first trial. However for LPC2387 there is unbelievably
> small subset of insufficient documents..
Does the JTAG I/F work with a known functioning board?
Leon
------------------------------------
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
Re: JTAG is no working in LPC2387.. - jorgepolar - Jun 14 7:12:35 2008
Hi,
A.F.A.I.K, the 2387 is a slightly new part. However, the problem you descri=
be is very similar to what I suffered a couple of months with my first 23xx=
part, and I know 23xx share lot of same modules inside.
You don't mention the tool you use for programming/debugging through JTAG, =
but this solved my problem: Reduce clock speed of the JTAG to 100KHz or les=
s, and if possible use the RTCLK option.
Hope this helps.
De:l...@yahoogroups.com
Para:l...@yahoogroups.com
C=F3pia:
Data:Sat, 14 Jun 2008 08:02:43 -0000
Assunto:[lpc2000] JTAG is no working in LPC2387..
I designed a small simple board using LPC2387. However, JTAG interface
does not respond to my Wiggler clone. I watched the signals and found
that all TDI, TMS, TRST, TCK signals are present but TDO signal coming
from LPC stays high -I think it is also because of pull up resistor I
placed.=20
What might be missing? Am I missing to connect some pins to somewhere
to enable the JTAG interface? Or a sequence on boot?
PS: I am really disappointed by Philips' documentation again. I say
again because I've used their different sets of components including
thousands of EURO price tagged xray units. The problem was the same
and the missing information was filled by a lot of talking. When I
started using NXP there I was an afraid of documentation, and I have
more now. I used STR's chips and following the documents my design
just worked at first trial. However for LPC2387 there is unbelievably
small subset of insufficient documents..=20
=20
[Non-text portions of this message have been removed]
------------------------------------
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
A.F.A.I.K, the 2387 is a slightly new part. However, the problem you descri=
be is very similar to what I suffered a couple of months with my first 23xx=
part, and I know 23xx share lot of same modules inside.
You don't mention the tool you use for programming/debugging through JTAG, =
but this solved my problem: Reduce clock speed of the JTAG to 100KHz or les=
s, and if possible use the RTCLK option.
Hope this helps.
De:l...@yahoogroups.com
Para:l...@yahoogroups.com
C=F3pia:
Data:Sat, 14 Jun 2008 08:02:43 -0000
Assunto:[lpc2000] JTAG is no working in LPC2387..
I designed a small simple board using LPC2387. However, JTAG interface
does not respond to my Wiggler clone. I watched the signals and found
that all TDI, TMS, TRST, TCK signals are present but TDO signal coming
from LPC stays high -I think it is also because of pull up resistor I
placed.=20
What might be missing? Am I missing to connect some pins to somewhere
to enable the JTAG interface? Or a sequence on boot?
PS: I am really disappointed by Philips' documentation again. I say
again because I've used their different sets of components including
thousands of EURO price tagged xray units. The problem was the same
and the missing information was filled by a lot of talking. When I
started using NXP there I was an afraid of documentation, and I have
more now. I used STR's chips and following the documents my design
just worked at first trial. However for LPC2387 there is unbelievably
small subset of insufficient documents..=20
=20
[Non-text portions of this message have been removed]
------------------------------------
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )