https://github.com/sekigon-gonnoc/Pico-PIO-USB

USB host/device implementation using PIO of raspberry pi pico (RP2040).
https://github.com/sekigon-gonnoc/Pico-PIO-USB

Last synced: about 8 hours ago
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USB host/device implementation using PIO of raspberry pi pico (RP2040).

• Host: GitHub
• URL: https://github.com/sekigon-gonnoc/Pico-PIO-USB
• Owner: sekigon-gonnoc
• License: mit
• Created: 2021-12-18T01:49:36.000Z (almost 3 years ago)
• Default Branch: main
• Last Pushed: 2024-09-23T02:29:14.000Z (about 2 months ago)
• Last Synced: 2024-11-11T19:01:54.529Z (5 days ago)
• Language: C
• Homepage:
• Size: 184 KB
• Stars: 1,359
• Watchers: 43
• Forks: 144
• Open Issues: 46
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Pico-PIO-USB

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

You can add additional USB port to RP2040.

## Demo

https://user-images.githubusercontent.com/43873124/146642806-bdf34af6-4342-4a95-bfca-229cdc4bdca2.mp4

## Project status

|Planned Features|Status|

|-|-|

|FS Host|✔|

|LS Host|✔|

|Hub support|✔|

|Multi port|✔|

|FS Device|✔|

## Examples

- [host_hid_to_device_cdc.c](examples/host_hid_to_device_cdc/host_hid_to_device_cdc.c) which print mouse/keyboard report from host port to device port's cdc. TinyUSB is used to manage both device (native usb) and host (pio usb) stack.

- [usb_device.c](examples/usb_device/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).

```bash

cd examples

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

## Resource Usage

- 1 PIO, 3 state machines, 32 instructions

- 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