The Cleanest Reset for ARM Processor
- by waffleman
Lately, I've been cleaning up some some C code that runs on an ARM7 controller. In some situations (upgrade, fatal error, etc...) the program will perform a reset. Presently it just jumps to 0 and assumes that the start-up code will reinitialize everything correctly. It got me to thinking about what would be the best procedure a la "Leave No Trace" for an ARM reset. Here is my first crack at it:
void Reset(void)
{
/* Disable interrupts */
__disable_interrupts();
/* Reset peripherals, externals and processor */
AT91C_BASE_RSTC->RSTC_RCR = AT91C_RSTC_KEY | AT91C_RSTC_PERRST | AT91C_RSTC_EXTRST| AT91C_RSTC_PROCRST;
while(AT91C_BASE_RSTC->RSTC_RSR & AT91C_RSTC_SRCMP);
/* Jump to the reset vector */
(*(void(*)())0)();
}
Anything I haven't considered?
