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printf on lpc2129

Russell Bull

I can't seem to get printf going on my system. I've declared putchar as extern and written a routine called putchar to output to the serial port, but the application dies whenever I try to printf. I dare say I'm not doing something fairly fundamental!

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  • 0 in reply to Jon Ward

    I'n using the GNU toolchain. With the tinyarm board they supply the IAR tools but there was no sample programs and I couldn't get a piece of code to run, so I tried the Keil demo that had the blinky demo. That ran first time so I've stuck with the Keil tools. I'm porting across some of my 8bit code to do a comparison in terms of performance and to get a feel for the ARM tools. Now I've overcome the printf problem, I can forge ahead! Cheers.

  • 0 in reply to Russell Bull

    There is a generic GNU example that shows printf I/O in the folder:
    Keil\ARM\GNU\Examples\Hello.

    It is written for a Atmel device, but can be easily adapted to any other part. Change the following:



  • 0 in reply to Russell Bull

    There is a generic GNU example that shows printf I/O in the folder:
    Keil\ARM\GNU\Examples\Hello.

    It is written for a Atmel device, but can be easily adapted to any other part. Change the following:

    • UART initalization at the beginning of main.
    • I/O functions in SERIAL.C.

    Basically you may take a look to the Keil ARM C example (part of DKARM V1.3) in the folder Keil\ARM\Examples\Hello. This variant of the "Hello World" program is already configured for an LPC21xx device.