# freeRTOS UART Implementation on LPC1769

**URL:** <https://forums.freertos.org/t/freertos-uart-implementation-on-lpc1769/7792>\
**Category:** Kernel\
**Created:** [April 17, 2019, 4:53am UTC](https://forums.freertos.org/t/freertos-uart-implementation-on-lpc1769/7792 "2019-04-17T04:53:10Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![system](https://d2v6vdsk2p900z.cloudfront.net/original/1X/7fc8fdb729c645aab5b20282bbe34e57cb407be6.jpeg) [@system](https://forums.freertos.org/u/system)\
**Post date:** [April 17, 2019, 4:53am UTC](https://forums.freertos.org/t/freertos-uart-implementation-on-lpc1769/7792/1 "2019-04-17T04:53:10Z")

</div>

**[kamleshpatel](https://sourceforge.net/u/kamleshpatel/)** wrote on [Wednesday, April 17, 2019](https://sourceforge.net/p/freertos/discussion/382005/thread/2dc4e6b1a6/#0628):

Dear Sir  
i am new with FreeRTOS and iam work on LPC1769 mbed board.  
i am write driver for UART.it is work normally but if i use semaphore or mutex for interrupt handling then it stuck on UART3\_IRQHandler function.i have attached my code with it please find it.  
when i run this code it stuck on UART3\_IRQHandler function and not running any thread.  
please guide to resolve it.  
remarks:- without semaphore or mutex it receive and send data on UART is ok.but in fast data on UART it is miss data so i think to used semaphore and mutex.

please guide me to resolve this problem.  
thanks in advance.