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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