Problem with GO command and LPC2468

[fossi15]

Hello,
i am using a LPC2468 and want to update the firmware with ISP. This is working fine, but then i want to use the go command to restart the controller and this fails! I had a look in my Map file and this told my that i have a entry point at 0x26c. Now i enter this address in Flash Magic and click the ok button. But nothing happens...
Can anyone give an idea what i made wrong?

Thank you, Norbert

[Andy Ayre]

Are you using DTR and RTS for ISP entry? If so try increasing the delay in the Go window. I recently was using the Go function with a 1000ms delay and it was working fine.

Try your hex file with a start address of 0x00000000 and see if it works.

Another idea is to create a simple blinky program that has a start address of 0x00000000, then try that. If it works then the problem is with your original hex file or it's entry point.

Andy

[fossi15]

Hello Andy,
thank you for yur response! In my application i don't have the possibility to use the DTR and RTS lines. In the cable are only Rx, Tx and GND connected. I hope this is not a problem!
I tried the GO command with a delay of 2000ms, but without success.
I use the IAP command 'reinvokeISP' to start the ISP routines. After this i am updating my firmware with FM and then i want to start my firmware with GO. Maybe reinvoking is a problem?

Bye, Norbert

[Andy Ayre]

If you are not using DTR/RTS then the delay in the Go window will have no effect.

If you remove and apply power to your board does your code execute? If not then it's a problem with your code. If it does then the start point is 0x0000000, not 0x0000026C.

Also make sure your code verifies using the verify feature.

Andy

[fossi15]

Hello Andy,

when i make a hardware reset, my firmware is starting normaly. And i tried both of addresses as entry point, 0x0 and 0x26c. I had a look at the data stream, which came over the RS232 during the go command. I found out, that FM always sends a 'G 0 T...' to the µC, regardless the setting i used with the go command (ARM or Thumb mode). The next thing i found out, is that the µC sends the echo for this sequence of ASCII, but not return Code.

Bye, Norbert