LPC1343 Development Board Load Flash Error

[lpcware]

Content originally posted in LPCWare by joebobku on Thu Jul 28 12:41:39 MST 2011
Pretty new to this.. but it appears I've somehow locked the flash on this development board (OM11048).  Is there a way to reset the parts. I am thinking that I shut the clock off to the flash when I programmed this in

LPC_SYSCON->SYSAHBCLKCTRL = 0b1000000000;

After doing this when I try to reprogram flash through USB I get the following error.

05: File 'xxx.axf' load failure Et. Flash Driver Not Ready

I've managed to lock a few of these boards up now.. and am guessing this is what I'm doing wrong.  I am NOT setting the CRP so it's not that. 

I am running windows 7, express0 4.05.. everything is up to date. Any help on this issue.  I do not have a JTAG programmer to try and go in through that way.

[lpcware]

Content originally posted in LPCWare by Ex-Zero on Thu Jul 28 13:45:07 MST 2011

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Quote: joebobku
...and am guessing this is what I'm doing wrong...

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You can stop guessing now, that is wrong :)

[lpcware]

Content originally posted in LPCWare by joebobku on Thu Jul 28 13:33:04 MST 2011
Answered my own question.. but for those of you with the same question

[B]Getting debug access to target chip[/B]

It  is possible to download an image into the flash on the target that will  then prevent further debug connections. The classic cases of this are

[LIST]
[*]The image contains code that sets the MCU clocks up "incorrectly".
[*]The image contains code that enables a watchdog timer.
[*]The image contains code that "switches off" some, or all of the multiplexed debug pins (JTAG/SWD).
[/LIST]
If  you do this, then there are a couple of possible ways to try to recover  debug access to the MCU (depending upon the MCU being used).
Once  you have managed to recover debug access to the MCU, the first thing  that you should do is overwrite the image in flash with one that sets  the system up in a safe manner, so that future debug connections will be  successful without the need to recover debug access again. You would  normally use the in-built flash programmer to erase the flash.

[B]NXP LPCxxxx ISP[/B]

The  first thing to try with NXP LPC MCU's to recover debug access is to  boot into the ISP bootloader. That is, GND the ISP pin, assert RST, then  remove the GND to ISP pin. Once in the ISP bootloader, the target clock  configuration is stable, and the debug pins are in their default state -  you should be able to connect.
[B]Note[/B]: The ISP pin is:

[LIST]
[*]P0.1 - for LPC11xx and LPC13xx 
[*]P2.10 - for LPC17xx
[*]For other MCU's, please check the user manual.
[/LIST]

[B]Note for RDB1768 users[/B]

The LPC1768 on the RDB1768 board can be placed into ISP by

[LIST]
[*]Press and hold the ISP button
[*]Press and release the RST button
[*]Release the ISP button
[/LIST]