103 lines
2.6 KiB
Rust
103 lines
2.6 KiB
Rust
|
#![no_std]
|
||
|
|
#![no_main]
|
||
|
|
#![feature(type_alias_impl_trait)]
|
||
|
|
|
||
|
|
use defmt::*;
|
||
|
|
use embassy_executor::Spawner;
|
||
|
|
use embassy_rp::i2c::{self, Config};
|
||
|
|
use embassy_rp::interrupt;
|
||
|
|
use embassy_time::{Duration, Timer};
|
||
|
|
use embedded_hal_async::i2c::I2c;
|
||
|
|
use {defmt_rtt as _, panic_probe as _};
|
||
|
|
|
||
|
|
#[allow(dead_code)]
|
||
|
|
mod mcp23017 {
|
||
|
|
pub const ADDR: u8 = 0x20; // default addr
|
||
|
|
|
||
|
|
macro_rules! mcpregs {
|
||
|
|
($($name:ident : $val:expr),* $(,)?) => {
|
||
|
|
$(
|
||
|
|
pub const $name: u8 = $val;
|
||
|
|
)*
|
||
|
|
|
||
|
|
pub fn regname(reg: u8) -> &'static str {
|
||
|
|
match reg {
|
||
|
|
$(
|
||
|
|
$val => stringify!($name),
|
||
|
|
)*
|
||
|
|
_ => panic!("bad reg"),
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// These are correct for IOCON.BANK=0
|
||
|
|
mcpregs! {
|
||
|
|
IODIRA: 0x00,
|
||
|
|
IPOLA: 0x02,
|
||
|
|
GPINTENA: 0x04,
|
||
|
|
DEFVALA: 0x06,
|
||
|
|
INTCONA: 0x08,
|
||
|
|
IOCONA: 0x0A,
|
||
|
|
GPPUA: 0x0C,
|
||
|
|
INTFA: 0x0E,
|
||
|
|
INTCAPA: 0x10,
|
||
|
|
GPIOA: 0x12,
|
||
|
|
OLATA: 0x14,
|
||
|
|
IODIRB: 0x01,
|
||
|
|
IPOLB: 0x03,
|
||
|
|
GPINTENB: 0x05,
|
||
|
|
DEFVALB: 0x07,
|
||
|
|
INTCONB: 0x09,
|
||
|
|
IOCONB: 0x0B,
|
||
|
|
GPPUB: 0x0D,
|
||
|
|
INTFB: 0x0F,
|
||
|
|
INTCAPB: 0x11,
|
||
|
|
GPIOB: 0x13,
|
||
|
|
OLATB: 0x15,
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#[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;
|
||
|
|
let irq = interrupt::take!(I2C1_IRQ);
|
||
|
|
|
||
|
|
info!("set up i2c ");
|
||
|
|
let mut i2c = i2c::I2c::new_async(p.I2C1, scl, sda, irq, Config::default());
|
||
|
|
|
||
|
|
use mcp23017::*;
|
||
|
|
|
||
|
|
info!("init mcp23017 config for IxpandO");
|
||
|
|
// init - a outputs, b inputs
|
||
|
|
i2c.write(ADDR, &[IODIRA, 0x00]).await.unwrap();
|
||
|
|
i2c.write(ADDR, &[IODIRB, 0xff]).await.unwrap();
|
||
|
|
i2c.write(ADDR, &[GPPUB, 0xff]).await.unwrap(); // pullups
|
||
|
|
|
||
|
|
let mut val = 1;
|
||
|
|
loop {
|
||
|
|
let mut portb = [0];
|
||
|
|
|
||
|
|
i2c.write_read(mcp23017::ADDR, &[GPIOB], &mut portb).await.unwrap();
|
||
|
|
info!("portb = {:02x}", portb[0]);
|
||
|
|
i2c.write(mcp23017::ADDR, &[GPIOA, val | portb[0]]).await.unwrap();
|
||
|
|
val = val.rotate_left(1);
|
||
|
|
|
||
|
|
// get a register dump
|
||
|
|
info!("getting register dump");
|
||
|
|
let mut regs = [0; 22];
|
||
|
|
i2c.write_read(ADDR, &[0], &mut regs).await.unwrap();
|
||
|
|
// always get the regdump but only display it if portb'0 is set
|
||
|
|
if portb[0] & 1 != 0 {
|
||
|
|
for (idx, reg) in regs.into_iter().enumerate() {
|
||
|
|
info!("{} => {:02x}", regname(idx as u8), reg);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
Timer::after(Duration::from_millis(100)).await;
|
||
|
|
}
|
||
|
|
}
|