_int_unexpected_isr

oldone1 — Fri, 27 May 2011 02:52:25 GMT

1. has anybody rewritten (int_unx.c) to use some type of raw serial so that it will work with interrupt serial (ittyx) instead of just polled (ttyx).

2. Is there a document describing the data you get from _int_unexpected_isr to help determine the problem.

3. Spent about 3 hours yesterday in _int_unexpected_isr because of a gpio_ioctl(read) on a const GPIO_PIN_STRUCT, the const made the structure end up in read only memory and gpio_ioctl(read) caused access to read only memory and that is how I ended up in _int_unexpected_isr

cheers,

Re: _int_unexpected_isr

egoodii — Wed, 01 Jun 2011 01:20:18 GMT

You will want to add these prints to int_unx.c:

printf ("BFAR = %x\n", (*((volatile unsigned long *)(0xE000ED38))));
printf ("CFSR = %x\n", (*((volatile unsigned long *)(0xE000ED28))));
printf ("HFSR = %x\n", (*((volatile unsigned long *)(0xE000ED2C))));
printf ("DFSR = %x\n", (*((volatile unsigned long *)(0xE000ED30))));
printf ("AFSR = %x\n", (*((volatile unsigned long *)(0xE000ED3C))));

I have found the first 8 words of the first memory dump to generally be the exception stack R0/1/2/3/12/LR/PC/PSP in order.

An apnote to understand it all:

http://www.keil.com/appnotes/files/apnt209.pdf

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Re: _int_unexpected_isr