Race Wheel Software

By Matthew Hait

Software for USB sim racing steering wheel running on FreeRTOS.

GPIO BOM

User Inputs

• 12 - Buttons
  • OP: One output each
  • GPIO: GP2-13
• 5 - Encoders
  • PN: Encoder_CTS-288T232R161A2
  • OP: Two-bit encoder, Two outputs, Interrupts needed
  • GPIO: GP14-21,GP22,GP28
• 2 - Paddles (Buttons)
  • OP: One output each
  • GPIO: GP0-1 Move to save UART for future projects
• 2 - Hall Effect for clutch
  • OP: Analog
  • GPIO: 26, 27
• 1 - Multi-direction Switch
  • PN: RKJXT1F
  • OP: 4 POS + rotate + press
  • GPIO: TBD

Other

• Internal Temp Sensor
  • OP: P.589 RP2040 Datasheet
  • GPIO: ain_sel #4

Outputs

• USB HID Gamepad
  • TinyUSB:
    • See examples "pico-examples\usb\device\dev_hid_composite"
    • https://github.com/hathach/tinyusb/tree/master/src/portable/raspberrypi/rp2040
    • https://github.com/hathach/tinyusb/tree/master/examples/device/hid_composite_freertos
  • CDC ACM port
  • DMA if used: https://www.youtube.com/watch?v=-Wh3SIAl0Ic
  • GPIO
    • https://raspberrypi.github.io/pico-sdk-doxygen/group__hardware__gpio.html

Tasking

• FreeRTOS
  • https://github.com/smittytone/RP2040-FreeRTOS

Pinout for 4 Pin Aviation Connector

1: PWR - Red 2: Rx - White 3: Gnd - Black 4: TX - Green

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Commands I forget

• export PICO_SDK_PATH=/mnt/c/Users/PoisonGryphon/Documents/My\ Files/proj/pico/pico-sdk/