71 lines
1.9 KiB
Rust
71 lines
1.9 KiB
Rust
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#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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use defmt::*;
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use embassy_executor::Spawner;
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use embassy_rp::i2c::{self, Config};
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use embassy_time::{Duration, Timer};
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use embedded_hal_1::i2c::blocking::I2c;
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use {defmt_rtt as _, panic_probe as _};
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#[allow(dead_code)]
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mod mcp23017 {
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pub const ADDR: u8 = 0x20; // default addr
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pub const IODIRA: u8 = 0x00;
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pub const IPOLA: u8 = 0x02;
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pub const GPINTENA: u8 = 0x04;
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pub const DEFVALA: u8 = 0x06;
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pub const INTCONA: u8 = 0x08;
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pub const IOCONA: u8 = 0x0A;
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pub const GPPUA: u8 = 0x0C;
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pub const INTFA: u8 = 0x0E;
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pub const INTCAPA: u8 = 0x10;
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pub const GPIOA: u8 = 0x12;
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pub const OLATA: u8 = 0x14;
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pub const IODIRB: u8 = 0x01;
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pub const IPOLB: u8 = 0x03;
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pub const GPINTENB: u8 = 0x05;
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pub const DEFVALB: u8 = 0x07;
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pub const INTCONB: u8 = 0x09;
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pub const IOCONB: u8 = 0x0B;
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pub const GPPUB: u8 = 0x0D;
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pub const INTFB: u8 = 0x0F;
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pub const INTCAPB: u8 = 0x11;
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pub const GPIOB: u8 = 0x13;
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pub const OLATB: u8 = 0x15;
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}
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#[embassy_executor::main]
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async fn main(_spawner: Spawner) {
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let p = embassy_rp::init(Default::default());
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let sda = p.PIN_14;
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let scl = p.PIN_15;
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info!("set up i2c ");
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let mut i2c = i2c::I2c::new_blocking(p.I2C1, scl, sda, Config::default());
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use mcp23017::*;
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info!("init mcp23017 config for IxpandO");
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// init - a outputs, b inputs
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i2c.write(ADDR, &[IODIRA, 0x00]).unwrap();
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i2c.write(ADDR, &[IODIRB, 0xff]).unwrap();
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i2c.write(ADDR, &[GPPUB, 0xff]).unwrap(); // pullups
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let mut val = 0xaa;
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loop {
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let mut portb = [0];
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i2c.write(mcp23017::ADDR, &[GPIOA, val]).unwrap();
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i2c.write_read(mcp23017::ADDR, &[GPIOB], &mut portb).unwrap();
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info!("portb = {:02x}", portb[0]);
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val = !val;
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Timer::after(Duration::from_secs(1)).await;
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}
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}
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