1.. _module-pw_sys_io_emcraft_sf2: 2 3--------------------- 4pw_sys_io_emcraft_sf2 5--------------------- 6.. pigweed-module:: 7 :name: pw_sys_io_emcraft_sf2 8 9``pw_sys_io_emcraft_sf2`` implements the ``pw_sys_io`` facade over 10UART. 11 12The Emcraft SF2 sys IO backend provides a UART driver layer that allows 13applications built against the ``pw_sys_io`` interface to run on a 14SmartFusion/2 chip and do simple input/output via UART. However, this should 15work with all Smartfusion/2 variations. 16 17This backend allows you to configure which UART to use. The point of it is to 18provide bare-minimum platform code needed to do UART reads/writes. 19 20Setup 21===== 22This module requires relatively minimal setup: 23 241. Write code against the ``pw_sys_io`` facade. 252. Specify the ``dir_pw_sys_io_backend`` GN global variable to point to this 26 backend. 273. pw_sys_io_Init() provided by this module needs to be called in early boot 28 to get pw_sys_io into a working state. 294. Build an executable with a main() function using a toolchain that 30 supports Cortex-M3. 31 32.. note:: 33 This module provides early firmware init, so it will conflict with other 34 modules that do any early device init. 35 36Module usage 37============ 38After building an executable that utilizes this backend, flash the 39produced .elf binary to the development board. Then, using a serial 40communication terminal like minicom/screen (Linux/Mac) or TeraTerm (Windows), 41connect to the device at a baud rate of 57600 (8N1). 42 43Dependencies 44============ 45- :ref:`module-pw_sys_io` 46- :ref:`module-pw_preprocessor` 47