Data to fill into unused program space on ARM7.

DanishGuy · 2008-05-30T10:33:05+00:00

Greetings.I'm trying to find some genious data to fill into the unused FLASH spacin my project, so that a stray program counter would get caught and msystem would reset.I'm thinking one of multiple solutions::o) Loop to current position and get caught by the watchdog:o) Jump to reset vector:o) An illegal opcode, that will generate an interrupt:o) A software interrupt instructionOne problem with most of the solutions is that I'm using ARM and THUMinstructions. A THUMB jump to the reset vector might mean something else iARM. The best solution would be to find some data that is illegal in botARM and THUMB. If for instance 0xDEAD is illegal for THUMB, and 0xDEADDEAis illegal for ARM, them my problem would be solved.Does anybody have a suggestion?Best regards Michael

May 30, 2008 20 Replies

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DanishGuy 18 years ago

Finally got back from my side tracking, and took a look at the 0xEFF solution, and just as you said, Wim, in THUMB mode it went straight to th invalid-opcode-interrupt and in ARM mode it triggered a SWI. That was the solution to my problem (if you can call it that). Thanks a lot Wim.

Best regards Michael

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