Crash after adding Code I have an project with following Flash Code areas: 0x0000 - 0x4000: Downloader 0x4000 - 0xC000: Firmware 0xC000 - 0xFFFF: Parameters In the Firmware area is about 1 kbyte free memory space. The Code runs in Flash. The firmware works fine, reprogramming the Parameter area in Flash also on the target system works fine. If a add some code, the firmware crashs after following program part for reprogramming the flash (Parameters): 1. Copy Flash Programming routine from Flash into RAM 2. Switch memory model from Harvard memory to Von-Neumann memory. (64k Flash, 32k RAM) 3. Run Flash Routine in RAM. The Program does not return after running Flash Routines. There is no difference to delete the contents (emty funktion). The Jump out of the function fails. If I don't reprogram the Parameter Area, the firmware seems to work fine. I can not see any mal behave. I had the same problem, if I divide the main() Funktion in more smaller functions. But I never found the cause. I have controlled the stack on target system and there is enough space. Has anybody an idea, what happens? Thanks
in 99% of the cases where I have seen "crash after adding code" the reason has been the timing in the original code. Erik
Thank you Erik, but I think the descriped problem doesn't coused by an timing problem. My application has no timing critical program part. The watchdog timeout startes the firmware a few secondes later. The watchdog is the only time critical part. Armin
but I think the descriped problem doesn't coused by an timing problem. My application has no timing critical program part ANYTHING with (an) interrupt(s) has (a) time critical part(s). Even some non-interrupt cases can have timing problems. To elaborate, an example: 1) the processing in "main" is running at a loop time of ~1 ms. 2) Characters arrive at 9600 = ~1ms/character. 3)the program is "working" (no problems show. 4) a few instructions are added to "main" making it run a few microseconds slower than the character rate. 5) the problem sporadically malfunctions, but not where the new instructions were added Erik
what derivative are you using? Erik
Erik, maybe you are right with your timing problem. The crash is caused after dividing the main() into more smaller functions with about 3 Parameters. Maybe it slow down the controller. But I'm not sure if it is enough for an crash. I will check it. I'm using an 80C320 form Dallas on an Phytec micro modul 8051 with horrible 16k Flash blocks. Armin