From 5e2c52ee5b6fcc5b50589fd2590657e3f1083bff Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Wed, 28 Sep 2022 01:20:04 -0700 Subject: embassy-rp: async i2c implementation This is an interrupt-driven async i2c master implementation. It makes as best use of the RP2040's i2c block's fifos as possible to minimize interrupts. It implements embedded_hal_async::i2c for easy interop. WIP async impl --- examples/rp/Cargo.toml | 3 +++ 1 file changed, 3 insertions(+) (limited to 'examples') diff --git a/examples/rp/Cargo.toml b/examples/rp/Cargo.toml index 3c8f923e7..e689df6bd 100644 --- a/examples/rp/Cargo.toml +++ b/examples/rp/Cargo.toml @@ -30,3 +30,6 @@ embedded-hal-1 = { package = "embedded-hal", version = "1.0.0-alpha.8" } embedded-hal-async = { version = "0.1.0-alpha.1" } embedded-io = { version = "0.3.0", features = ["async", "defmt"] } static_cell = "1.0.0" + +[profile.release] +debug = true -- cgit From 1ee4bb22deb19e93a7c68e04875889e3e4e31c29 Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Wed, 28 Sep 2022 09:35:19 -0700 Subject: embassy-rp i2c: async (non-blocking) example Simple example exercising an mcp23017 GPIO expander, configured on RP2040 GPIOs 14+15 (i2c1) with 8 inputs and 8 outputs. Input bit 0 controls whether to display a mcp23017 register dump. --- examples/rp/src/bin/i2c_async.rs | 102 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 102 insertions(+) create mode 100644 examples/rp/src/bin/i2c_async.rs (limited to 'examples') diff --git a/examples/rp/src/bin/i2c_async.rs b/examples/rp/src/bin/i2c_async.rs new file mode 100644 index 000000000..d1a2e3cd7 --- /dev/null +++ b/examples/rp/src/bin/i2c_async.rs @@ -0,0 +1,102 @@ +#![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; + } +} -- cgit From e1faf8860776f6ad2bac2f3b06e7160fe00da7df Mon Sep 17 00:00:00 2001 From: huntc Date: Sun, 9 Oct 2022 13:07:25 +1100 Subject: Removes some of the code duplication for UarteWithIdle This commit removes some of the code duplication for UarteWithIdle at the expense of requiring a split. As the example illustrates though, this expense seems worth the benefit in terms of maintenance, and the avoidance of copying over methods. My main motivation for this commit was actually due to the `event_endtx` method not having been copied across. --- examples/nrf/src/bin/uart_idle.rs | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'examples') diff --git a/examples/nrf/src/bin/uart_idle.rs b/examples/nrf/src/bin/uart_idle.rs index 09ec624c0..6af4f7097 100644 --- a/examples/nrf/src/bin/uart_idle.rs +++ b/examples/nrf/src/bin/uart_idle.rs @@ -15,7 +15,8 @@ async fn main(_spawner: Spawner) { config.baudrate = uarte::Baudrate::BAUD115200; let irq = interrupt::take!(UARTE0_UART0); - let mut uart = uarte::UarteWithIdle::new(p.UARTE0, p.TIMER0, p.PPI_CH0, p.PPI_CH1, irq, p.P0_08, p.P0_06, config); + let uart = uarte::Uarte::new(p.UARTE0, irq, p.P0_08, p.P0_06, config); + let (mut tx, mut rx) = uart.split_with_idle(p.TIMER0, p.PPI_CH0, p.PPI_CH1); info!("uarte initialized!"); @@ -23,12 +24,12 @@ async fn main(_spawner: Spawner) { let mut buf = [0; 8]; buf.copy_from_slice(b"Hello!\r\n"); - unwrap!(uart.write(&buf).await); + unwrap!(tx.write(&buf).await); info!("wrote hello in uart!"); loop { info!("reading..."); - let n = unwrap!(uart.read_until_idle(&mut buf).await); + let n = unwrap!(rx.read_until_idle(&mut buf).await); info!("got {} bytes", n); } } -- cgit