ESP32-C3 interfacing to a PS/2 Keyboard (bare-metal Rust)
Very simplified example of connecting a PS/2 keyboard to ESP32-C3
You need to build it with the release profile (i.e. cargo run --release) since otherwise the interrupt latency is too slow.
Circuit
- 2 x 2.2kΩ resitors
- 2 x 120Ω resitors
Keyboard ESP32-C3
5V ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 5V
GND ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ GND
┏━━━━━┓
DATA ━━━━━━━━━━━━━━━━━━━━━┳━━━━━━┫ 120 ┣━━━ IO1
┃ ┗━━━━━┛
┏┻┓
┃2┃
┃.┃
┃2┃
┃k┃
┗┳┛
┃
┣━━━━━━━━━━━━━━━━ 3V3
┃
┏┻┓
┃2┃
┃.┃
┃2┃
┃k┃
┗┳┛
┃ ┏━━━━━┓
CLK ━━━━━━━━━━━━━━━━━━━━━┻━━━━━━┫ 120 ┣━━━ IO2
┗━━━━━┛