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ITM-DEbugging with NXP LPC1768

Robert Schilling

Hi guys,

First of all, I'm using a LPC1768 development board in combination with a JLink Debugger which supports ITM-Debugging over printf. I'm using Keil MDK 4.10.

Using a direct call of ITM_SendChar() works. The character is displayed in KEIL IDE.

For using this putchar function I have to implement fputc()

int fputc(int ch, FILE *f)
{
        return (ITM_SendChar(ch));
}

If i call printf() my prgram doesn't work. The debugger tells me that is stops at
<pre
0x00000E48 BEAB BKPT 0xAB0

Can you help me that printf() works?

Thanks in advance!
Best regards from Austria
Robert

Parents
  • 0 in reply to Robert  

    Thanks for help. I forgot to define stdout.
    stdin-debugging isn't possible over ITM. Is that right. So i don't need the declaration of stdin and implementation fgetc.

    What do _ttywrch() and _sys_exit() do? I used ITM a year before and I rememeber that I don used them. I didn't use ferror() too.

    regards
    Robert

Reply
  • 0 in reply to Robert  

    Thanks for help. I forgot to define stdout.
    stdin-debugging isn't possible over ITM. Is that right. So i don't need the declaration of stdin and implementation fgetc.

    What do _ttywrch() and _sys_exit() do? I used ITM a year before and I rememeber that I don used them. I didn't use ferror() too.

    regards
    Robert

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