Writing code on the Maple Mini

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diff --git a/source/microcontrollers/index.rst b/source/microcontrollers/index.rst
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    :maxdepth: 2
    :caption: Contents:
 
+   maple_mini/index
    olimex-esp32-pro/index
diff --git a/source/microcontrollers/maple_mini/index.rst b/source/microcontrollers/maple_mini/index.rst
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+************
+ Maple Mini
+************
+
+Programming with OpenOCD
+========================
+
+The Maple Mini can be programmed using OpenOCD_ and a suitable
+programmer.
+
+.. _OpenOCD: https://openocd.sourceforge.io/
+
+To program a Maple Mini the following PINs should be connected:
+
+====  ===
+Prog  MM
+====  ===
+GND   GND
+3V3   Vcc
+MOSI  D22
+CLK   D21
+====  ===
+
+If the maple mini still has the original firmware it may be necessary to
+press and hold the button (at least 1 s) while resetting the board, to
+enter DMU mode.
+
+Create the file ``openocd.cfg`` according to the programmer you are
+using, and then run::
+
+   openocd -f openocd.cfg
+   telnet localhost 4444
+
+To then write ``<binary>.elf`` to the Maple Mini use the following
+commands::
+
+   reset halt
+   stm32f1x unlock 0
+   reset halt
+   flash write_image erase <binary>.elf
+   stm32f1x lock 0
+   reset halt
+
+With an ST-Link V2 Clone from Baite
+-----------------------------------
+
+The required PINs on the ST-Link V2 Clone from Baite are as follows,
+with the notch on the left::
+
+       +------+
+       | 1  2 | 3V3
+    5V | 3  4 | CLK (MM 21)
+         5  6 | MOSI (MM 22)
+   GND | 7  8 |
+       | 9 10 |
+       +------+
+
+``openocd.cfg`` should have the following contents::
+
+   source [find interface/stlink.cfg]
+
+   source [find target/stm32f1x.cfg]
+
+
+With a Bus Pirate v3.6
+----------------------
+
+``openocd.cfg`` should have the following contents::
+
+   source [find interface/buspirate.cfg]
+
+   buspirate_port /dev/ttyUSB0
+   buspirate_vreg 1
+   buspirate_mode normal
+   transport select swd
+
+   source [find target/stm32f1x.cfg]
+
+Programmin with gnuk/tool/stlinkv2.py
+=====================================
+
+gnuk also provides a tool to write binaries; first the board should be
+unlocked with::
+
+   ./stlinkv2.py -u
+
+then reset (while pressing the button), and the flash erased::
+
+   ./stlinkv2.py -e
+
+and finally it can be written with::
+
+   ./stlinkv2.py <binary>.elf
+
+See also
+========
+
+* https://web.archive.org/web/20150502182337/http://nodonogard.blogspot.com/2014/08/writting-gnuk-binary-to-fst-01-using-st.html
+* https://www.earth.li/~noodles/blog/2017/02/gnuk-on-maple-mini.html
+* https://www.earth.li/~noodles/blog/2015/08/program-fst01-with-buspirate.html
+
+..
+   vim: set filetype=rst: