It seems that the image isn’t always getting written to my mBed-LPC1768.

I was having a problem so I tried backing off to a known working version of the code. When I loaded it, it didn’t work either. So I downloaded the HelloWorld_LPC1768.bin from the Getting Started instructions and loaded it on the target after deleting my code. This worked so I reloaded the known good copy of my code (after deleting HelloWorld_LPC1768.bin), it now worked, so I loaded the version I was debugging, it worked as well. So I continued updating my code and on the next load, everything failed again.

This time I renamed HelloWorld_LPC1768.bin to match the name of my code’s binary image (LPC1768.bin). Guess what, it didn’t work. So I deleted the binary and reloaded the renamed HelloWorld_LPC1768.bin. It now worked. So I tried reloading my code and after reset it was running the renamed HelloWorld_LPC1768.bin code!!! After seeing this I tried deleting the old binary before loading a new binary image, this didn’t help as sometimes it would be running the new image and sometimes the old. As a last test, I tried loading the original HelloWorld_LPC1768.bin with its original name, This now sometimes worked and didn't. Since encountering this I’ve also tried un-mounting the mBed target from my computer and re-mounting it, which sometimes helps and sometimes doesn’t and rebooting my computer between loads. Once again, it sometimes helps and sometimes doesn’t

At this point I’m really confused. I don’t know if there is a bug in the built in loader or the on board flash is failing. I find it hard to believe that the flash is failing since I’ve only had this for less than 1 week and have probably loaded less than 100 times to the target. I’ve also been using it stand-alone (no extra hardware) on a bread-board (for pin protection) while I get used to programming the LPC1768.

Any ideas, information on known/suspected loading issues and suggestions would be greatly appreciated. Thanks G

[EDIT] Corrected references to LPC2368 to LPC1768 [/EDIT]

What OS are you using ?

It sounds like your OS has not written the image to the USB stick yet.

I know when using Linux (as I do) you need to mount the USB stick in 'synchronous' mode or simply use a 'sync' command after transferring your compiled image. Windows does this AFAIK automatically although I read about USB/mbed problems with Windows 7

My OS is Windows XP but I don't think that's the problem since the loading issue didn't show up until the last couple of days.

G.

Hi Grant,

You mention in your notes things like "HelloWorld_LPC2368.bin" which is for the LPC2368 board, but I think you have the LPC1768 board; one thing to check is you are trying to run/compile for the right target, as they use different binaries (they contain different ARM processors/peripherals, so make sure you are using the right one).

To get a basic hello world for the LPC1768, try:

• http://mbed.org/nxp/lpc1768/

And if that doesn't work, have a work through:

• http://mbed.org/cookbook/deadmbed

Hopefully that'll get you up and running, but if not, please don't hesitate to email us at support@mbed.org

Simon

I double checked and the software was/is the LPC1768 version, I just entered the wrong name in the original post (cut-and-paste error).

I went through the dead mbed section, again with the same results. Sometimes it loads and runs as expected, sometimes it doesn't even replace the flashed code.