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74 lines
2.6 KiB
Markdown
74 lines
2.6 KiB
Markdown
# Flashing the Arduino HID
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## Serial Firmware (the default option)
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This operation can be done using your RPi (except Pi Zero W). Here the common steps:
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1. Disconnect the RESET wire from the Arduino board.
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2. Connect the Arduino and RPi with a suitable USB cable.
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3. [Log in to the Raspberry Pi using SSH](https://docs.pikvm.org/first_steps/#getting-access-to-pikvm).
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4. Upload the firmware (USB keyboard & mouse is used by default, on this step [you can choose PS/2 keyboard](arduino_hid.md#ps2-keyboard)):
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```
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# rw
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# systemctl stop kvmd
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# cp -r /usr/share/kvmd/hid/arduino ~
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# cd ~/hid
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# make
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# make install
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# reboot
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```
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5. Connect the RESET wire, disconnect the USB cable, and reboot the RPi.
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With a Pi Zero W, you may consider building the firmware on a faster system and programming using USB or booting from another SD card and following the build steps using a clone of the [KVMD repo](https://github.com/pikvm/kvmd).
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## SPI Firmware
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This operation can be done using your Raspberry Pi without disconnecting any wires:
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1. Connect the Arduino and RPi with a suitable USB cable.
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2. [Log in to the Raspberry Pi using SSH](https://docs.pikvm.org/first_steps/#getting-access-to-pikvm).
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3. Execute `rw`, add line `dtoverlay=spi0-1cs` to `/boot/config.txt` and perform `reboot`.
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4. Build and upload the firmware (USB keyboard & mouse is used by default)
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```shell
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# rw
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# systemctl stop kvmd
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# cp -r /usr/share/kvmd/hid/arduino ~
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# cd ~/hid
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# make spi
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# make install
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# reboot
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```
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## Common Errors
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### Circuit Issues
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#### Common - Reset Wire
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Different pins are used for the reset wire but serve a similar function. For programming the TTL firmware over USB, the reset wire should be disconnected. When programming using SPI, the reset wire needs to be connected through a transistor circuit and connected to GPIO25 (pin 22 on the GPIO header)
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#### SPI-specific Wiring
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The 3v3, ground, Reset (GPIO25), MISO, MOSI, SCLK, and CS1 need to be connected appropriately. SPIO_CS0 and SPIO_CS1 can both be used but the default configuration uses SPIO_CS1 for the Arduino Microcontroller (CS0 is used for another device on the V3). These generally follow a block as follows:
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```
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Pin 0 2 4
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2 0 0
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.........GR.C.......
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Row # 12345678901234567890
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........3MMS........
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Pin 0 1 3
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1 7 9
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```
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The most common error is an "off-by-one" error where pins are shifted by a row. Some cases have non-standard GPIO layouts so please be careful when following these instructions using a case that has a modified pinout.
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