@@ -53,11 +53,31 @@ The default board is PYBV10 but any of the names of the subdirectories in the
5353should produce binary images in the ` build-PYBV11/ ` subdirectory (or the
5454equivalent directory for the board specified).
5555
56- You must then get your board/microcontroller into DFU mode. On the pyboard
57- connect the 3V3 pin to the P1/DFU pin with a wire (they are next to each
58- other on the bottom left of the board, second row from the bottom) and then
59- reset (by pressing the RST button) or power on the board. Then flash the
60- firmware using the command:
56+
57+ ### Flashing the Firmware using DFU mode
58+
59+ You must then get your board/microcontroller into DFU (Device Firmware
60+ Update) mode.
61+
62+ If you already have MicroPython installed on the board you can do that by
63+ calling ` machine.bootloader() ` on the board, either at the REPL or using
64+ ` pyboard.py ` . A nice property of this approach is that you can automate it
65+ so you can update the board without manually pressing any buttons.
66+
67+ If you do not have MicroPython running yet, temporarily jumper your board's
68+ DFU pin (typ. BOOT0) to 3.3v and reset or power-on the board.
69+
70+ On a pyboard the P1/DFU pin and a 3.3v pin are next to each other (on the
71+ bottom left of the board, second row from the bottom) and the reset button
72+ is labeled RST.
73+
74+ For the pyboard D-series you can enter the mboot DFU bootloader by holding down
75+ the USR button, pressing and releasing the RST button, and continuing to hold
76+ down USR until the LED is white (4th in the cycle), then let go of USR while
77+ the LED is white. The LED will then flash red once per second to indicate it
78+ is in USB DFU mode.
79+
80+ Once the board is in DFU mode, flash the firmware using the command:
6181
6282 $ make BOARD=PYBV11 deploy
6383
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