# Printf on m52259evb

**URL:** <https://forums.freertos.org/t/printf-on-m52259evb/4967>\
**Category:** Kernel\
**Created:** [October 5, 2011, 1:46pm UTC](https://forums.freertos.org/t/printf-on-m52259evb/4967 "2011-10-05T13:46:09Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![system](https://d2v6vdsk2p900z.cloudfront.net/original/1X/7fc8fdb729c645aab5b20282bbe34e57cb407be6.jpeg) [@system](https://forums.freertos.org/u/system)\
**Post date:** [October 5, 2011, 1:46pm UTC](https://forums.freertos.org/t/printf-on-m52259evb/4967/1 "2011-10-05T13:46:09Z")

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**[yntarius](https://sourceforge.net/u/yntarius/)** wrote on [Wednesday, October 05, 2011](https://sourceforge.net/p/freertos/discussion/382005/thread/db7d03ac/#4ac5):

Hi,

I’m new to the FreeRTOS and I’ve being working on using it with a m52259evb from Freescale.  
Since on my company we won’t use ColdWarrior, I did some modifications so I could use the Demo files from the 52233 with the 52259 under eclipse. It took me a little time to get the hang of it but now I can turn the evb LEDS on and off (I know it might not sound much but I’m getting used to the board and FreeRTOS).  
However, for a short period I used MQX and when I did a printf, I could see the output on a minicom terminal connected to the board serial port. I belive the same should happen with FreeRTOS, but I can’t get the printf to work (it compiles and all but nothing shows up).  
I did copy the printf-stdargs.c from the 52259 demo project but still nothing.  
Am I missing some sort of configuration? I’m kinda lost here.

Thanks a lot  
Ariel

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<div class="post-metadata">

**Author:** ![system](https://d2v6vdsk2p900z.cloudfront.net/original/1X/7fc8fdb729c645aab5b20282bbe34e57cb407be6.jpeg) [@system](https://forums.freertos.org/u/system)\
**Post date:** [October 5, 2011, 2:03pm UTC](https://forums.freertos.org/t/printf-on-m52259evb/4967/2 "2011-10-05T14:03:07Z")

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**[erupter](https://sourceforge.net/u/erupter/)** wrote on [Wednesday, October 05, 2011](https://sourceforge.net/p/freertos/discussion/382005/thread/db7d03ac/#24b9):

I don’t know the specific platform, but usually onboard hardware modules (like the UART/USART you plan to use) need be configured for operation.  
In the USART case things most probably needed are:  
-sync/async  
-parity  
-stop bits  
-baudrate  
-module enabled/disabled

Maybe check the mcu manual?

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<div class="post-metadata">

**Author:** ![system](https://d2v6vdsk2p900z.cloudfront.net/original/1X/7fc8fdb729c645aab5b20282bbe34e57cb407be6.jpeg) [@system](https://forums.freertos.org/u/system)\
**Post date:** [October 5, 2011, 2:04pm UTC](https://forums.freertos.org/t/printf-on-m52259evb/4967/3 "2011-10-05T14:04:44Z")

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**[erupter](https://sourceforge.net/u/erupter/)** wrote on [Wednesday, October 05, 2011](https://sourceforge.net/p/freertos/discussion/382005/thread/db7d03ac/#85e6):

Also there \*might\* already be a configuration lingering from the original demo, but it might be wrong for the selected micro.

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<div class="post-metadata">

**Author:** ![system](https://d2v6vdsk2p900z.cloudfront.net/original/1X/7fc8fdb729c645aab5b20282bbe34e57cb407be6.jpeg) [@system](https://forums.freertos.org/u/system)\
**Post date:** [October 6, 2011, 8:46am UTC](https://forums.freertos.org/t/printf-on-m52259evb/4967/4 "2011-10-06T08:46:56Z")

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**[davedoors](https://sourceforge.net/u/davedoors/)** wrote on [Thursday, October 06, 2011](https://sourceforge.net/p/freertos/discussion/382005/thread/db7d03ac/#8f01):

printf-stadarg.c is provided as a very light weight (in both code and RAM) alternative to standard library printf()/sprintf() functions. If you include it in your project it will replace the printf()/sprintf() that comes with your compiler. It is likely that the printf()/sprintf() that comes with your compiler has an option to direct its output to the UART already, if you look for it. If you use printf-stdarg.c then you have to do that yourself. They way to do it is set up a UART with the baud rate and other parameters as already suggested in this thread, then in printf-stdarg.c implement a putchar() to write the char to the UART. You will also have to remove the line “#define putchar© c” from the top of printf-stdarg.c, else your putchar() implementation will get #defined to nothing.