Lumpio-: ``` //! This example shows how to communicate using i2c with external chips. //! //! Example written for the [`MCP23017 16-Bit I2C I/O Expander with Serial Interface`] chip. //! (https://www.microchip.com/en-us/product/mcp23017) #![no_std] #![no_main] use defmt::*; use embassy_executor::Spawner; use embassy_rp::i2c::{self, Config}; use embassy_time::Timer; use embedded_hal_1::i2c::I2c; use {defmt_rtt as _, panic_probe as _}; #[allow(dead_code)] mod sdc41 { pub const ADDR: u8 = 0x62; // default addr pub const START_PERIODIC_MESUREMENT: [u8; 2] = [0x21, 0xb1]; pub const READ_MEASUREMENT: [u8; 2] = [0xec, 0x05]; pub const STOP_PERIODIC_MEASUREMENT: [u8; 2] = [0x3f, 0x86]; } #[embassy_executor::main] async fn main(_spawner: Spawner) { let p = embassy_rp::init(Default::default()); let sda = p.PIN_14; let scl = p.PIN_15; info!("set up i2c "); let mut i2c = i2c::I2c::new_blocking(p.I2C1, scl, sda, Config::default()); use sdc41::*; // info!("init mcp23017 config for IxpandO"); // init - a outputs, b inputs // i2c.write(ADDR, &[IODIRA, 0x00]).unwrap(); // i2c.write(ADDR, &[IODIRB, 0xff]).unwrap(); // i2c.write(ADDR, &[GPPUB, 0xff]).unwrap(); // pullups // let mut val = 0xaa; loop { let mut response = [0]; i2c.write(ADDR, &START_PERIODIC_MESUREMENT).unwrap(); i2c.write_read(ADDR, &READ_MEASUREMENT, &mut response).unwrap(); i2c.write(ADDR, &STOP_PERIODIC_MEASUREMENT).unwrap(); info!("response = {:02x}", response[0]); Timer::after_secs(1).await; } } ```