Hi,
Seems very similair to a problem i had recently with an 18f4520.
As someone on this mailinglist pointed out, the extended instruction set had
to be disabled.
To do this add _XINST_OFF_4L to the __CONFIG4L initialisation.
Regards,
-Bastiaan
On Thursday 30 October 2008 09:35:36 Vaclav Peroutka wrote:
> Hello all,
>
> yesterday I experimented with printf() on PIC18F2580. I included stdio.h, I
> defined void PUTCHAR(char c) and I set stdout=STREAM_USER.
>
> PIC sent some proper string just during the programming. But after I
> switched normal supply, I got nothing on UART. But program run ok (flashing
> LED loop).
>
> So I removed stdio.h and wrote
> void printf( char * aStr) {
> while (*aStr) {
> PUTCHAR(*aStr);
> aStr++;
> }
> }
>
> With this function I get funny characters. If I tried printf("CAN terminal
> test"); , I got following sequence of characters: 0xC3, 0xC1, 0xCE, 0x20,
> 0xF4, 0xE5, ... etc. Thus, with bit7 set for any character except space. If
> I used PUTCHAR('C'); PUTCHAR('A'); just before printf(), for couple of
> chars it went well. But then again after approx. 10 characters, it got
> crazy. After I change something small (for example I add or remove one
> PUTCHAR() ) the program even freezes somewhere.
>
> I found that strings are put into program memory and inside my printf(),
> gptrget() is used. Can I have some problem with internal libraries of PIC16
> ?
>
> Thank you for help,
> Vaclav
>
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