Initial commit.

README.md

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+STM32 Cube library - CMSIS and HAL for F4, F7 and L4 microcontrollers
+=====================================================================
+
+This repository contains a copy of STMicroelectronic's STM32 Cube firmware
+library, with CMSIS-device and HAL code for STM32F4xx, STM32F7xx and STM32L4xx
+microcontrollers.  Minor changes are applied to the HAL source to support
+MicroPython's port to the STM32.
+
+The "vendor" branch contains the original sources and is updated from
+time-to-time when new versions become available.  The upstream sources are
+provided as separate releases (and in separate archives) for each
+microcontroller class (eg F4, F7, L4).  These are merged together here in
+the "vendor" branch, because the idea of the HAL code is that it provides a
+uniform interface to all microcontroller classes.  The commits in the "vendor"
+branch are tagged as appropriate with a tag that describes all the available
+versions at that commit, for example F4-1.5.0+F7-1.1.0+L4-1.3.0.
+
+There are then working branches that branch at a given vendor tag and apply
+minor patches to the vendor code, for example work-F4-1.5.0+F7-1.1.0+L4-1.3.0.
+The patches/commits that form a given working branch are reapplied (with
+conflict resolution) to newer vendor tags to create the next working branch.
+
+Original sources
+================
+
+The sources are obtained from ``http://st.com``
+
+For all .c and .h files the following processing has been done to the original
+files before committing them here:
+- lines endings changed to unix style
+- trailing spaces removed
+- tabs expanded to 4 spaces
+- non-ASCII chars converted to their ASCII equivalent
+
+A shell function to do this processing is:
+```sh
+function clean_code() {
+    cat $1 | awk "{sub(/[\t ]*\r/,\"\")}1" | expand -t 4 | tr \\200\\221\\222\\223\\224\\226\\231\\265\\327\\342 \'\'\'\"\"-\'ux\' > tmp$$
+    mv tmp$$ $1
+}
+```
+
+Directories from the original sources are mapped into this repository according
+to the following:
+```
+Drivers/STM32F4xx_HAL_Driver/Inc ->          STM32F4xx_HAL_Driver/Inc
+Drivers/STM32F4xx_HAL_Driver/Src ->          STM32F4xx_HAL_Driver/Src
+Drivers/CMSIS/Device/ST/STM32F4xx/Include -> CMSIS/STM32F4xx/Include
+```
+And similar for the other microcontroller classes.