# using freeRTOS vPrintString() with LPCXpresso and lpc1769 does not print anything on the console

**URL:** <https://forums.freertos.org/t/using-freertos-vprintstring-with-lpcxpresso-and-lpc1769-does-not-print-anything-on-the-console/1257>\
**Category:** Kernel\
**Created:** [February 13, 2014, 3:06pm UTC](https://forums.freertos.org/t/using-freertos-vprintstring-with-lpcxpresso-and-lpc1769-does-not-print-anything-on-the-console/1257 "2014-02-13T15:06:52Z")\
**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:** [February 13, 2014, 3:06pm UTC](https://forums.freertos.org/t/using-freertos-vprintstring-with-lpcxpresso-and-lpc1769-does-not-print-anything-on-the-console/1257/1 "2014-02-13T15:06:52Z")

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**[antshiv](https://sourceforge.net/u/antshiv/)** wrote on [Thursday, February 13, 2014](https://sourceforge.net/p/freertos/discussion/382005/thread/392ed59d/#ed42):

I am using LPC1769 and trying to test freeRTOS using its vPrintString() function but i am unable to see anything outputted on to the console. I am not sure how it works internally, and how exactly the string is passed back to the host computer but any help as to how to get this working using this setup -\> LPCxpresso + lpc1769 + FreeRTPS.

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**Author:** ![system](https://d2v6vdsk2p900z.cloudfront.net/original/1X/7fc8fdb729c645aab5b20282bbe34e57cb407be6.jpeg) [@system](https://forums.freertos.org/u/system)\
**Post date:** [February 13, 2014, 5:11pm UTC](https://forums.freertos.org/t/using-freertos-vprintstring-with-lpcxpresso-and-lpc1769-does-not-print-anything-on-the-console/1257/2 "2014-02-13T17:11:34Z")

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**[davedoors](https://sourceforge.net/u/davedoors/)** wrote on [Thursday, February 13, 2014](https://sourceforge.net/p/freertos/discussion/382005/thread/392ed59d/#7b92):

Where is vPrintString() supposed output its characters? A UART?

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**Author:** ![system](https://d2v6vdsk2p900z.cloudfront.net/original/1X/7fc8fdb729c645aab5b20282bbe34e57cb407be6.jpeg) [@system](https://forums.freertos.org/u/system)\
**Post date:** [February 22, 2014, 10:29pm UTC](https://forums.freertos.org/t/using-freertos-vprintstring-with-lpcxpresso-and-lpc1769-does-not-print-anything-on-the-console/1257/3 "2014-02-22T22:29:11Z")

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**[antshiv](https://sourceforge.net/u/antshiv/)** wrote on [Saturday, February 22, 2014](https://sourceforge.net/p/freertos/discussion/382005/thread/392ed59d/#6914):

Its supposed to output it on the LPCXpresso IDE console. I am not sure how the actual vPrintString works under the hood. Either it sends the message back to the host machine using UART or I am not sure how.

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**Author:** ![system](https://d2v6vdsk2p900z.cloudfront.net/original/1X/7fc8fdb729c645aab5b20282bbe34e57cb407be6.jpeg) [@system](https://forums.freertos.org/u/system)\
**Post date:** [February 23, 2014, 7:50am UTC](https://forums.freertos.org/t/using-freertos-vprintstring-with-lpcxpresso-and-lpc1769-does-not-print-anything-on-the-console/1257/4 "2014-02-23T07:50:24Z")

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**[davedoors](https://sourceforge.net/u/davedoors/)** wrote on [Sunday, February 23, 2014](https://sourceforge.net/p/freertos/discussion/382005/thread/392ed59d/#8281):

Step into the function in LPCXpresso and see what it calls, or what it does. If I know what it is doing I might be able to help.