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GitHub - sekigon-gonnoc/Pico-PIO-USB: USB host/device implementation using PIO o...

 2 years ago
source link: https://github.com/sekigon-gonnoc/Pico-PIO-USB
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Pico-PIO-USB

USB host/device implementation using PIO of raspberry pi pico (RP2040).

You can add additional USB port to RP2040.

constructionThis library is WIP. API may be changed drastically in future. construction

demo.mp4

Project status

Planned Features Status

FS Host heavy_check_mark

LS Host heavy_check_mark

Hub support heavy_check_mark

Multi port heavy_check_mark

FS Device heavy_check_mark

Examples

  • capture_hid_report.c is a USB host sample program which print HID reports received from device. Open serial port and connect devices to pico. Default D+/D- is gp0/gp1. Call pio_usb_add_port() to use additional ports.
  • usb_device.c is a HID USB FS device sample which moves mouse cursor every 0.5s. External 1.5kohm pull-up register is necessary to D+ pin (Default is gp0).
cd example
mkdir build
cd build
cmake ..
make
# Copy UF2 file in capture_hid_report/ or usbdevice/ to RPiPico

Another sample program for split keyboard with QMK

https://github.com/sekigon-gonnoc/qmk_firmware/tree/rp2040/keyboards/pico_pico_usb

Resource Usage

  • Two PIO
    • One PIO is for USB transmitter using 22 instruction and one state machine
    • Another PIO is for USB receiver using 31 instruction and two state machine
  • Two GPIO for D+/D- (Series 22ohm resitors are better)
  • 15KB ROM and RAM
  • (For Host) One 1ms repeating timer
  • (For Device) One PIO IRQ for receiver

report

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