# FreeRTOS SPI and printf to terminal via UART **URL:** \ **Category:** Kernel\ **Created:** [April 29, 2013, 12:51pm UTC](https://forums.freertos.org/t/freertos-spi-and-printf-to-terminal-via-uart/5171 "2013-04-29T12:51:10Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![system](https://d2v6vdsk2p900z.cloudfront.net/original/1X/7fc8fdb729c645aab5b20282bbe34e57cb407be6.jpeg) [@system](https://forums.freertos.org/u/system)\ **Post date:** [April 29, 2013, 12:51pm UTC](https://forums.freertos.org/t/freertos-spi-and-printf-to-terminal-via-uart/5171/1 "2013-04-29T12:51:10Z")
**[goldie13](https://sourceforge.net/u/goldie13/)** wrote on [Monday, April 29, 2013](https://sourceforge.net/p/freertos/discussion/382005/thread/e48cf145/#e168): Hi, I am using Atmel SAM4S-EK board and FreeRTOS 7.3.0. For some reason, after I use ‘freertos\_spi\_write\_packet’ or ‘freertos\_spi\_read\_packet’, the ‘printf’ or ‘sprintf’ and ‘puts’ to terminal does not work. I use the Atmel ‘configure\_console’ function that directs the output to UART. I want to say the before using the FreeRTOS functions, I see all ‘printf’’ on the terminal… Can you help? Thanks, ---
**Author:** ![rtel](https://d3iykfbgfh8zhg.cloudfront.net/user_avatar/forums.freertos.org/rtel/32/31_2.png) [@rtel](https://forums.freertos.org/u/rtel)\ **Post date:** [April 29, 2013, 1:13pm UTC](https://forums.freertos.org/t/freertos-spi-and-printf-to-terminal-via-uart/5171/2 "2013-04-29T13:13:23Z")
**[rtel](https://sourceforge.net/u/rtel/)** wrote on [Monday, April 29, 2013](https://sourceforge.net/p/freertos/discussion/382005/thread/e48cf145/#687c): A single USART port can be configured to operate as either a standard UART or an SPI port (as well as various other types of serial bus).  Are you sure your USART printf output and your SPI port are not using the same physical USART peripheral? Regards.