Problem with debug lpc1769

[lpcware]

Content originally posted in LPCWare by mcabral on Thu Jun 14 12:11:23 MST 2012
Hi everyone! I need some help with my boards LPC769 ... programming them after these become unusable. That is, I can not regain access to debugging. I tried to regain control via ISP, vector catch, Flashmagic and verified that CRP is not active but none of that works. I begin to believe that there is something wrong with the code or my PC but the code is very simple. The error message I get is the following:

02: Failed on connect: Ep(01). Target marked as not debuggable.
Emu(0): Connected. Was: None. DpID:     EDB6. Info: T1S6RGRIA

and no! I haven´t problems with the supply voltage:)

if anyone can help would be very grateful because there are several unused boards on my desk!:(

[ThomasGrant123]

Debugging LPC1769 issues can be tricky, especially when it comes to JTAG/SWD setup and clock configuration, so your question is very relatable. I’ve faced similar situations where a small configuration detail caused hours of confusion, and systematic checks really helped .In a way, tracking down hardware issues feels similar to reviewing data accuracy, like how Pinellas County Valuation requires careful verification of every detail. Hope you’re able to isolate the root cause soon, and thanks for sharing this problem—it’s useful for others working with the same MCU.

[lpcware]

Content originally posted in LPCWare by mcabral on Tue Jun 19 06:35:17 MST 2012

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Quote: Zero
After switching to ISP and receiving '?' your LPC is answering with "Synchronized".

#1 Switching to ISP is pulling down P2.10 and resetting.

#2 FlashMagic is doing everything you need (with Interface: None (ISP))

#3 Connecting 3.3V UART requires GND, RxD, TxD.

So with an LPCXpresso1769 board this is done very easy. And, as mentioned several times, it's nearly impossible to fail with #1 to #3.

The only difficult part is to use a working UART-USB converter. So about 99% of all problems are related with getting an USB connection.

If you are convinced that your USB connection is working (and you didn't CRP your mcu), you have a serious hardware problem :eek:
I don't know if you are facing that problems with your own boards and LPCXpresso1769 also, but after drawing several own board I've never lost a LPC1768/69;
even after testing faulty software :rolleyes: FlashMagic was always able to erase my LPC again :)

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ok, thanks Zero! I will try again, but I have no hope for it to work properly. Possibly I have had problems with static microcontrollers rendered unusable ...

[lpcware]

Content originally posted in LPCWare by Ex-Zero on Tue Jun 19 06:17:37 MST 2012

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Quote:
...sending a "?" should receive a response from the mic. This is right?

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After switching to ISP and receiving '?' your LPC is answering with "Synchronized".

#1 Switching to ISP is pulling down P2.10 and resetting.

#2 FlashMagic is doing everything you need (with Interface: None (ISP))

#3 Connecting 3.3V UART requires GND, RxD, TxD.

So with an LPCXpresso1769 board this is done very easy. And, as mentioned several times, it's nearly impossible to fail with #1 to #3.

The only difficult part is to use a working UART-USB converter. So about 99% of all problems are related with getting an USB connection.

If you are convinced that your USB connection is working (and you didn't CRP your mcu), you have a serious hardware problem :eek:
I don't know if you are facing that problems with your own boards and LPCXpresso1769 also, but after drawing several own board I've never lost a LPC1768/69;
even after testing faulty software :rolleyes: FlashMagic was always able to erase my LPC again :)

[lpcware]

Content originally posted in LPCWare by mcabral on Tue Jun 19 05:43:59 MST 2012
hello! testing of the UART I did it through a program that echoes characters received. Thus rule out problems between the converter level "USB to SERIAL (prolific)" and the micro. Please let me know if I'm doing something wrong with the programming via ISP. If I mistake not I connect only TX, RX and GND and sending a "?" should receive a response from the mic. This is right?

[lpcware]

Content originally posted in LPCWare by Ex-Zero on Sat Jun 16 02:21:48 MST 2012
There are several threads about connecting 1769 to USB:

#15 of http://knowledgebase.nxp.com/showthread.php?t=1931

http://knowledgebase.nxp.com/showthread.php?t=2709

http://knowledgebase.nxp.com/showthread.php?t=3020

[lpcware]

Content originally posted in LPCWare by Rob65 on Fri Jun 15 22:07:35 MST 2012

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Quote: mcabral
I tested the UART0 and everything works properly. but don´t get response from the microcontroller.

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How do you know UART0 is working if you don't get any response?

What kind of UART-USB bridge do you have? Connecting two together only tells that both are using the same voltage levels.
You should only use a UART-USB bride that provides 3.3V, not one of those with a DB9 connector - except when you have an RS232 level converted on your board.

Rob

[lpcware]

Content originally posted in LPCWare by mcabral on Fri Jun 15 13:48:35 MST 2012
I tested the UART0 and everything works properly. but don´t get response from the microcontroller. This time I tried with a new one but obviously I'm not doing something right to enter ISP mode. I'll keep trying but I read the documentation about this and should be able to communicate easily.
if I understand, just enough to send a character "?" and should receive a response from the microcontroller ... (after entering ISP mode)

[lpcware]

Content originally posted in LPCWare by Ex-Zero on Fri Jun 15 05:41:21 MST 2012
So you never got a working connection via UART0 to any LPC1769?

That would be a test of your hardware :)

Did you ever connect anything else (3.3V device) to your hardware?

What is your hardware and how did you connect it to LPC1769?

Did you scope RxD/TxD?

[lpcware]

Content originally posted in LPCWare by mcabral on Fri Jun 15 05:12:45 MST 2012

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Quote:
I can't believe that you've set CRP and I can't believe that you have destroyed several boards, therefore I think your UART hardware and FlashMagic is not working :eek:

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I tested the USB-UART bridge and everything is working properly. I connected two of them and could send and receive data without problems. Then I started running FlashMagic and I watched that data sent to read the device signature. Everything is operating as it should but the boards do not respond.:confused:

[lpcware]

Content originally posted in LPCWare by Ex-Zero on Thu Jun 14 14:25:14 MST 2012
If you can't confirm that your UART -> PC hardware and FlashMagic is working, it's useless to discuss about non working LPC1769 :(

I've never had a problem with any 1768/1769 hardware (since 2009), which couldn't be resolved with FlashMagic :)

I can't believe that you've set CRP and I can't believe that you have destroyed several boards, therefore I think your UART hardware and FlashMagic is not working :eek:

[lpcware]

Content originally posted in LPCWare by mcabral on Thu Jun 14 14:10:09 MST 2012
Rob, Zero:

yes, that I did was pulled low P2.10 and then reset the board. After that I run FlashMagic but nothing is working!:(
In the other hand, i tried send comands (e.g. "?") to UART0 after reset (in ISP mode) but there isn´t response from device...:confused:

[lpcware]

Content originally posted in LPCWare by Ex-Zero on Thu Jun 14 13:29:02 MST 2012
Did you ever connect FlashMagic to one of these boards successfully?

Otherwise you don't know if your UART hardware is faulty :eek:

After pulling low P2.10 and resetting (or reconnecting USB) your LPC is in ISP mode.

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Quote:

I have no SETTINGS that could affect debugging.

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That's not correct. Therefore it's important to switch to ISP and run FlashMagic :)

[lpcware]

Content originally posted in LPCWare by Rob65 on Thu Jun 14 13:24:36 MST 2012
What did you do to enter ISP mode?

ground P2.10 and then reset or apply power?

Rob

[lpcware]

Content originally posted in LPCWare by mcabral on Thu Jun 14 13:10:32 MST 2012

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Quote:
Are we talking about custom boards?

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yes and no! :D I used custom boards and lpcxpresso1769 ... both had the same result.

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Quote:
Does that mean that FlashMagic in ISP mode isn't reading your LPC?

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I tried to use flashmagic and Realterm. After following the steps to enter ISP mode send "?" and there was no response. With FlashMagic I could not even read the signature device. I think that I made the correct sequence for both tests ...

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Quote:
If you're not sure about that, just post your bin...

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I have no SETTINGS that could affect debugging. Even the CRP is not enabled! :confused:

[lpcware]

Content originally posted in LPCWare by Ex-Zero on Thu Jun 14 12:45:49 MST 2012

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Quote:
...my boards LPC769...

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Are we talking about custom boards?

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Quote:

...become unusable...

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Does that mean that FlashMagic in ISP mode isn't reading your LPC?

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Quote:

...something wrong with the code...

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If you're not sure about that, just post your bin :)