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48 lines
1.7 KiB
ReStructuredText
48 lines
1.7 KiB
ReStructuredText
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.. _chapter-dumb-io-baremetal-stm32f429:
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.. default-domain:: cpp
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.. highlight:: sh
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---------------------------
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STM32F429 baremetal dumb IO
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---------------------------
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The STM32F429 baremetal dumb IO backend provides device startup code and a UART
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driver to layer that allows applications built against the ``pw_dumb_io``
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interface to run on a STM32F429 chip and do simple input/output via UART.
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The code is optimized for the STM32F429I-DISC1, using USART1 (which is connected
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to the virtual COM port on the embedded ST-LINKv2 chip). However, this should
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work with all STM32F429 variations (and even some STM32F4xx chips).
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This backend has no configuration options. The point of it is to provide bare-
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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_dumb_io`` facade.
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2. Specify the ``dir_pw_dumb_io_backend`` GN gloabal variable to point to this
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backend.
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3. Build an executable with a main() function using a toolchain that
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supports Cortex-M4.
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.. note::
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This module provides early firmware init and a linker script, so it will
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conflict with other modules that do any early device init or provide a linker
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script.
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Module usage
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============
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After building a 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 or screen), connect to the device at a
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baud rate of 115200 (8N1). If you're not using a STM32F429I-DISC1 development
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board, manually connect a USB TLL adapter to pins `A9` (TX) and
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`A10` (RX).
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Dependencies
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============
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* pw_dumb_io facade
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* pw_preprocessor module
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