1.. _module-pw_sys_io_emcraft_sf2: 2 3--------------------- 4pw_sys_io_emcraft_sf2 5--------------------- 6 7``pw_sys_io_emcraft_sf2`` implements the ``pw_sys_io`` facade over 8UART. 9 10The Emcraft SF2 sys IO backend provides a UART driver layer that allows 11applications built against the ``pw_sys_io`` interface to run on a 12SmartFusion/2 chip and do simple input/output via UART. However, this should 13work with all Smartfusion/2 variations. 14 15This backend allows you to configure which UART to use. The point of it is to 16provide bare-minimum platform code needed to do UART reads/writes. 17 18Setup 19===== 20This module requires relatively minimal setup: 21 221. Write code against the ``pw_sys_io`` facade. 232. Specify the ``dir_pw_sys_io_backend`` GN global variable to point to this 24 backend. 253. pw_sys_io_Init() provided by this module needs to be called in early boot 26 to get pw_sys_io into a working state. 274. Build an executable with a main() function using a toolchain that 28 supports Cortex-M3. 29 30.. note:: 31 This module provides early firmware init, so it will conflict with other 32 modules that do any early device init. 33 34Module usage 35============ 36After building an executable that utilizes this backend, flash the 37produced .elf binary to the development board. Then, using a serial 38communication terminal like minicom/screen (Linux/Mac) or TeraTerm (Windows), 39connect to the device at a baud rate of 57600 (8N1). 40 41Dependencies 42============ 43- :ref:`module-pw_sys_io` 44- :ref:`module-pw_preprocessor` 45