This directory contains external library code.

The cmsis directory contains code from:
  https://github.com/ARM-software/CMSIS_5
version 5.7.0 (a65b7c9a3e6502127fdb80eb288d8cbdf251a6f4). Contents
taken from the CMSIS/Core/Include/ directory.

The sam3x directory contains code from the
Atmel.SAM3X_DFP.1.0.50.atpack zip file found at:
  http://packs.download.atmel.com/
version 1.0.50 (extracted on 20180725).

The sam4e directory contains code from the
Atmel.SAM4E_DFP.1.1.57.atpack zip file found at:
  http://packs.download.atmel.com/
version 1.1.57 (extracted on 20180806). It has been modified to fix
some AFEC register RW accesses. See sam4e.patch for the modifications.

The sam4s directory contains code from the
Atmel.SAM4S_DFP.1.0.56.atpack zip file found at:
  http://packs.download.atmel.com/
version 1.0.56 (extracted on 20181220).

The samd21 directory contains code from the
Atmel.SAMD21_DFP.1.3.304.atpack zip file found at:
  http://packs.download.atmel.com/
version 1.3.304 (extracted on 20180725).

The samd51 directory contains code from the
Atmel.SAMD51_DFP.1.1.96.atpack zip file found at:
  http://packs.download.atmel.com/
version 1.1.96 (extracted on 20190110).

The same70b directory contains code from the
Atmel.SAME70_DFP.2.4.166.atpack zip file found at:
  http://packs.download.atmel.com/
version 2.4.166 (extracted on 20210809).

The lpc176x directory contains code from the mbed project:
  https://github.com/ARMmbed/mbed-os
version mbed-os-5.8.3 (c05d72c3c005fbb7e92c3994c32bda45218ae7fe).
Contents taken from the targets/TARGET_NXP/TARGET_LPC176X/ directory.
It has been modified to set the appropriate clock speeds on the
LPC1768 and LPC1769. See lpc176x.patch for the modifications.

The stm32f0 directory contains code from:
  https://github.com/STMicroelectronics/STM32CubeF0
version v1.10.1 (d0c380d668c67dcdd4e44f656be27045ce4006a6). Contents
taken from the Drivers/CMSIS/Device/ST/STM32F0xx/ directory.

The stm32f1 directory contains code from:
  https://github.com/STMicroelectronics/STM32CubeF1
version v1.8.0 (441b2cbdc25aa50437a59c4bffe22b88e78942c9). Contents
taken from the Drivers/CMSIS/Device/ST/STM32F1xx/ directory.

The stm32f2 directory contains code from:
  https://github.com/STMicroelectronics/STM32CubeF2
version v1.9.0 (42fc8bf966c04ef814bb0620dcd3e036e038b4a2). Contents
taken from the Drivers/CMSIS/Device/ST/STM32F2xx/ directory.

The stm32f4 directory contains code from:
  https://github.com/STMicroelectronics/STM32CubeF4
version v1.24.1 (b5abca20c9676b04f8d2885a668a9b653ee65705). Contents
taken from the Drivers/CMSIS/Device/ST/STM32F4xx/ directory.

The stm32f7 directory contains code from:
  https://github.com/STMicroelectronics/STM32CubeF7
version v1.15.0 (3600603267ebc7da619f50542e99bbdfd7e35f4a). Contents
taken from the Drivers/CMSIS/Device/ST/STM32F7xx/ directory.

The stm32g0 directory contains code from:
  https://github.com/STMicroelectronics/STM32CubeG0
version v1.4.1 (5cb06333a6a43cefbe145f10a5aa98d3cc4cffee). Contents
taken from the Drivers/CMSIS/Device/ST/STM32G0xx/ directory.

The stm32g4 directory contains code from:
  https://github.com/STMicroelectronics/STM32CubeG4
version v1.4.0 (e762fe2ce800cf6c18a1868a3aabc7e9351751bd). Contents
taken from the Drivers/CMSIS/Device/ST/STM32G4xx/ directory.

The stm32h7 directory contains code from:
  https://github.com/STMicroelectronics/STM32CubeH7
version v1.9.0 (ccb11556044540590ca6e45056e6b65cdca2deb2). Contents
taken from the Drivers/CMSIS/Device/ST/STM32H7xx/ directory.

The pico-sdk directory contains code from the pico sdk:
  https://github.com/raspberrypi/pico-sdk.git
version 2.0.0 (efe2103f9b28458a1615ff096054479743ade236). It has been
modified so that it can build outside of the pico sdk. See
pico-sdk.patch for the modifications.

The elf2uf2 directory contains code from the pico sdk:
  https://github.com/raspberrypi/pico-sdk.git
version 1.2.0 (bfcbefafc5d2a210551a4d9d80b4303d4ae0adf7). Contents
taken from the tools/elf2uf2/ directory.

The rp2040_flash directory contains a light-weight bootsel flash tool.
It uses C part of the the `picoboot_connection` directory found in:
  https://github.com/raspberrypi/picotool.git
version 2.0.0 (8a9af99ab10b20b1c6afb30cd9384e562a6647f9). Note that
Makefile and main.c are locally developed files (the remaining files
are from the picotool repo).

The hub-ctrl directory contains code from:
  https://github.com/codazoda/hub-ctrl.c/
revision 42095e522859059e8a5f4ec05c1e3def01a870a9.

The bossac directory contains code from:
  https://github.com/shumatech/BOSSA
version 1.9 (b176eeef918fc810045c832348590595120187b4).

The hidflash directory contains code from:
  https://github.com/Serasidis/STM32_HID_Bootloader
version 2.2.2 (2ab7927a27b7b78ef730782ea5f9b5d2c8f34671). It has been
modified to work with Klipper - see hidflash/README for the
details. See changes.diff for the modifications.

The fast-hash directory contains code from:
  https://github.com/ztanml/fast-hash
revision ae3bb53c199fe75619e940b5b6a3584ede99c5fc

The kconfiglib directory contains code from:
  https://github.com/ulfalizer/Kconfiglib.git
version v14.1.0 (061e71f7d78cb057762d88de088055361863deff). It has
been modified to always emit symbols and to simplify the "menuconfig"
screens. See kconfiglib.patch for the modifications.

The fatfs directory contains code from:
  http://elm-chan.org/fsw/ff/00index_e.html
version R0.14a (extracted 20210116).  The configuration (ffconf.h)
has been modfied to enable the US code page (437) and enable label
support.  The file "diskio.c" in the original archive is not included
as it is only serves as an example for how to implement the media api
callbacks.

The can2040 directory contains code from:
  https://github.com/KevinOConnor/can2040
commit 13321ce2bc046e059a47def70f977a579a984462.
