topic MCF52259 Software Reset Problem in ColdFire/68K Microcontrollers and Processors

MCF52259 Software Reset Problem

kdavis — Wed, 17 Oct 2012 14:46:17 GMT

I am using a MCF52259 with mqx 3.8.1. I am trying to use the reset control register to do a software reset, and when I do I get a some weird stack trace (below) and the processor locks up. Location 0x8 hex is the illegal instruction vector address, but I am not using interrupts for this program, and they are disabled. The code runs fine, until the reset where I get these problems.

This is the only code I have for the reset, and its all the manual shows that I should need.

MCF_RCM_RCR |= MCF_RCM_RCR_SOFTRST;

Thanks for any help you might be able to give,

Kevin

3 0x00000008 (0x00000008)() 0x00000008
2 0x20007FFC (0x20007FFC)() 0x20007ffc
1 _startup() startup.c:55 0x00000010

Re: MCF52259 Software Reset Problem

kdavis — Wed, 17 Oct 2012 16:34:18 GMT

I should say that there is a boot loader and an application and I am trying to go back to the bootloader from the application by resetting the chip. So when I say I am not using interrupts I mean in the bootloader.

Re: MCF52259 Software Reset Problem

butok — Thu, 18 Oct 2012 07:36:24 GMT

Hi,

For example, to reset MCF, I use the following code (from www.fnet.sf.net project):

fnet_mcf.c:

void fnet_cpu_reset (void)

{

#if FNET_CFG_MCF_RCM

FNET_MCF_RCM_RCR = FNET_MCF_RCM_RCR_SOFTRST | FNET_MCF_RCM_RCR_FRCRSTOUT;

#else

unsigned long address = *((unsigned long *)(0x4));

(( void(*)() )address)(); /* Jump. */

#endif

}

Hope it will help,

Andrey Butok

Re: MCF52259 Software Reset Problem

kdavis — Tue, 13 Nov 2012 19:35:22 GMT

I did get it working they was Andrey suggested, but when using the RCR it would never succesfully restart