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e520091eeb
Introduces a GN-based build for the Emcraft Smartfusion 2 SOM. * Adds 'emcraft_sf2_som' as a pw_system target. * Smartfusion MSS HAL added to 'third_party'. Change-Id: Ibdb4affdd11e5ba57659b90f8182ef0bc24ab9e7 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/86940 Reviewed-by: Keir Mierle <keir@google.com> Reviewed-by: Armando Montanez <amontanez@google.com> Commit-Queue: Sean Keys <skeys@google.com>
45 lines
1.5 KiB
ReStructuredText
45 lines
1.5 KiB
ReStructuredText
.. _module-pw_sys_io_emcraft_sf2:
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---------------------
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pw_sys_io_emcraft_sf2
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---------------------
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``pw_sys_io_emcraft_sf2`` implements the ``pw_sys_io`` facade over
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UART.
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The Emcraft SF2 sys IO backend provides a UART driver layer that allows
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applications built against the ``pw_sys_io`` interface to run on a
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SmartFusion/2 chip and do simple input/output via UART. However, this should
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work with all Smartfusion/2 variations.
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This backend allows you to configure which UART to use. The point of it is to
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provide bare-minimum platform code needed to do UART reads/writes.
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Setup
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=====
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This module requires relatively minimal setup:
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1. Write code against the ``pw_sys_io`` facade.
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2. Specify the ``dir_pw_sys_io_backend`` GN global variable to point to this
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backend.
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3. pw_sys_io_Init() provided by this module needs to be called in early boot
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to get pw_sys_io into a working state.
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4. Build an executable with a main() function using a toolchain that
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supports Cortex-M3.
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.. note::
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This module provides early firmware init, so it will conflict with other
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modules that do any early device init.
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Module usage
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============
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After building an executable that utilizes this backend, flash the
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produced .elf binary to the development board. Then, using a serial
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communication terminal like minicom/screen (Linux/Mac) or TeraTerm (Windows),
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connect to the device at a baud rate of 57600 (8N1).
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Dependencies
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============
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* ``pw_sys_io`` facade
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* ``pw_preprocessor`` module
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