docs: Fix and extend the DFU documentation page
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@ -13,15 +13,20 @@ DFU is supported by ESP32-S2 chips. The necessary connections for the USB periph
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+------+-------------+
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| GPIO | USB |
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+======+=============+
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| 19 | D- (green) |
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| 20 | D- (green) |
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+------+-------------+
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| 20 | D+ (white) |
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| 19 | D+ (white) |
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+------+-------------+
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| GND | GND (black) |
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+------+-------------+
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| | +5V (red) |
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| +5V | +5V (red) |
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+------+-------------+
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.. note::
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The ESP32-S2 chip needs to be in bootloader mode for the detection as a DFU device and flashing. This can be
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achieved by pulling GPIO0 down (e.g. pressing the BOOT button), pulsing RESET down for a moment and releasing
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GPIO0.
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The software requirements of DFU are included in :ref:`get-started-get-prerequisites` of the Getting Started Guide.
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Section :ref:`api_guide_dfu_build` describes how to build firmware for DFU with ESP-IDF and
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@ -95,5 +100,5 @@ Common errors
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An easy way of checking the tool is running ``dfu-util --version``. Please see :ref:`get-started-get-prerequisites` for
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installing ``dfu-util``.
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- The reason for ``No DFU capable USB device available`` could be that the USB driver wasn't properly installed on
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Windows (see :ref:`api_guide_dfu_flash_win`) or udev rule was not setup on Linux
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(see :ref:`api_guide_dfu_flash_udev`).
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Windows (see :ref:`api_guide_dfu_flash_win`), udev rule was not setup on Linux
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(see :ref:`api_guide_dfu_flash_udev`) or the device isn't in bootloader mode.
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