Embedded Rust and Embassy and a display

PCA9548A test

Hardware Requirements

• RP2040
• RPi Pico Probe (for downloading and status messages from the RP2040)
• I2C SSD1306 OLED display (128x64 pixel)
• PCA9548A connected to a
• BMP280 for pressure and temperature

Software Requirements

• Install target compiler:

$ rustup target add thumbv6m-none-eabi

• To use the Pico probe:

$ cargo binstall probe-rs

• To use various tools, e.g. to see the code size of the generated ELF (e.g. cargo size):

$ cargo binstall cargo-binutils
$ cargo size
    Finished `dev` profile [optimized + debuginfo] target(s) in 0.05s
   text    data     bss     dec     hex filename
  42356       0  103960  146316   23b8c rp-bmp280

Running it

The OLED is connected to I2C0 (GPIO 4 and 5). The PCA9548A is connected to I2C1 (GPIO 2 and 3). The BMP280 is connected to bus 2 of the PCA9548A.