From 7f42dac8bf960038a14cac05a77e885c8cf011a2 Mon Sep 17 00:00:00 2001
From: Edward Shen <code@eddie.sh>
Date: Fri, 16 May 2025 22:48:56 -0700
Subject: [PATCH] Initial commit

---
 .cargo/config.toml |    8 +
 .gitignore         |    1 +
 .gitmodules        |    3 +
 Cargo.lock         | 2362 ++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml         |   86 ++
 build.rs           |   36 +
 embassy            |    1 +
 memory.x           |   17 +
 src/main.rs        |  202 ++++
 9 files changed, 2716 insertions(+)
 create mode 100644 .cargo/config.toml
 create mode 100644 .gitignore
 create mode 100644 .gitmodules
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 build.rs
 create mode 160000 embassy
 create mode 100644 memory.x
 create mode 100644 src/main.rs

diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..3d7d617
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,8 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+runner = "probe-rs run --chip RP2040"
+
+[build]
+target = "thumbv6m-none-eabi"        # Cortex-M0 and Cortex-M0+
+
+[env]
+DEFMT_LOG = "debug"
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..228128b
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "embassy"]
+	path = embassy
+	url = https://github.com/embassy-rs/embassy.git
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..9f6e50f
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,2362 @@
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+version = "1.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ced3678a2879b30306d323f4542626697a464a97c0a07c9aebf7ebca65cd4dde"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..07e4bd0
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,86 @@
+[package]
+edition = "2024"
+name = "oolong-water"
+version = "0.1.0"
+license = "MIT OR Apache-2.0"
+
+
+[dependencies]
+embassy-time = { version = "0.4.0", features = [
+    "defmt",
+    "defmt-timestamp-uptime",
+] }
+embassy-rp = { version = "0.4.0", features = [
+    "defmt",
+    "unstable-pac",
+    "time-driver",
+    "critical-section-impl",
+    "rp2040",
+    "intrinsics",
+] }
+embassy-executor = { version = "0.7.0", features = [
+    "arch-cortex-m",
+    "executor-thread",
+    "executor-interrupt",
+    "defmt",
+    "task-arena-size-8192",
+] }
+embassy-sync = { version = "0.6.2", features = ["defmt"] }
+# embassy-embedded-hal = { version = "0.3.0", path = "../../embassy-embedded-hal", features = ["defmt"] }
+# embassy-time = { version = "0.4.0", path = "../../embassy-time", features = ["defmt", "defmt-timestamp-uptime"] }
+# embassy-usb = { version = "0.4.0", path = "../../embassy-usb", features = ["defmt"] }
+# embassy-net = { version = "0.7.0", path = "../../embassy-net", features = ["defmt", "icmp", "tcp", "udp", "raw", "dhcpv4", "medium-ethernet", "dns", "proto-ipv4", "proto-ipv6", "multicast"] }
+# embassy-net-wiznet = { version = "0.2.0", path = "../../embassy-net-wiznet", features = ["defmt"] }
+embassy-futures = "0.1.1"
+# embassy-usb-logger = { version = "0.4.0", path = "../../embassy-usb-logger" }
+cyw43 = { version = "0.3.0", features = ["defmt", "firmware-logs"] }
+cyw43-pio = { version = "0.4.0", features = ["defmt"] }
+
+defmt = "0.3"
+defmt-rtt = "0.4"
+fixed = "1.23.1"
+fixed-macro = "1.2"
+
+# for web request example
+reqwless = { version = "0.13.0", features = ["defmt"] }
+serde = { version = "1.0.203", default-features = false, features = ["derive"] }
+serde-json-core = "0.5.1"
+
+# for assign resources example
+# assign-resources = { git = "https://github.com/adamgreig/assign-resources", rev = "bd22cb7a92031fb16f74a5da42469d466c33383e" }
+
+#cortex-m = { version = "0.7.6", features = ["critical-section-single-core"] }
+cortex-m = { version = "0.7.6", features = ["inline-asm"] }
+cortex-m-rt = "0.7.0"
+critical-section = "1.1"
+panic-probe = { version = "0.3", features = ["print-defmt"] }
+display-interface-spi = "0.5.0"
+embedded-graphics = "0.8.1"
+mipidsi = "0.8.0"
+display-interface = "0.5.0"
+byte-slice-cast = { version = "1.2.0", default-features = false }
+smart-leds = "0.4.0"
+heapless = "0.8"
+usbd-hid = "0.8.1"
+rand_core = "0.6.4"
+
+embedded-hal-1 = { package = "embedded-hal", version = "1.0" }
+embedded-hal-async = "1.0"
+embedded-hal-bus = { version = "0.1", features = ["async"] }
+embedded-io-async = { version = "0.6.1", features = ["defmt-03"] }
+embedded-storage = { version = "0.3" }
+static_cell = "2.1"
+portable-atomic = { version = "1.5", features = ["critical-section"] }
+log = "0.4"
+rand = { version = "0.8.5", default-features = false }
+embedded-sdmmc = "0.7.0"
+
+[profile.release]
+debug = 2
+lto = true
+opt-level = 'z'
+
+[profile.dev]
+debug = 2
+lto = true
+opt-level = "z"
diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..3f915f9
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,36 @@
+//! This build script copies the `memory.x` file from the crate root into
+//! a directory where the linker can always find it at build time.
+//! For many projects this is optional, as the linker always searches the
+//! project root directory -- wherever `Cargo.toml` is. However, if you
+//! are using a workspace or have a more complicated build setup, this
+//! build script becomes required. Additionally, by requesting that
+//! Cargo re-run the build script whenever `memory.x` is changed,
+//! updating `memory.x` ensures a rebuild of the application with the
+//! new memory settings.
+
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+
+fn main() {
+    // Put `memory.x` in our output directory and ensure it's
+    // on the linker search path.
+    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    File::create(out.join("memory.x"))
+        .unwrap()
+        .write_all(include_bytes!("memory.x"))
+        .unwrap();
+    println!("cargo:rustc-link-search={}", out.display());
+
+    // By default, Cargo will re-run a build script whenever
+    // any file in the project changes. By specifying `memory.x`
+    // here, we ensure the build script is only re-run when
+    // `memory.x` is changed.
+    println!("cargo:rerun-if-changed=memory.x");
+
+    println!("cargo:rustc-link-arg-bins=--nmagic");
+    println!("cargo:rustc-link-arg-bins=-Tlink.x");
+    println!("cargo:rustc-link-arg-bins=-Tlink-rp.x");
+    println!("cargo:rustc-link-arg-bins=-Tdefmt.x");
+}
diff --git a/embassy b/embassy
new file mode 160000
index 0000000..e8b1ea1
--- /dev/null
+++ b/embassy
@@ -0,0 +1 @@
+Subproject commit e8b1ea14c7fb151aa5e296ca8f9724f175bdeaef
diff --git a/memory.x b/memory.x
new file mode 100644
index 0000000..ef19dff
--- /dev/null
+++ b/memory.x
@@ -0,0 +1,17 @@
+MEMORY {
+    BOOT2 : ORIGIN = 0x10000000, LENGTH = 0x100
+    FLASH : ORIGIN = 0x10000100, LENGTH = 2048K - 0x100
+
+    /* Pick one of the two options for RAM layout     */
+
+    /* OPTION A: Use all RAM banks as one big block   */
+    /* Reasonable, unless you are doing something     */
+    /* really particular with DMA or other concurrent */
+    /* access that would benefit from striping        */
+    RAM   : ORIGIN = 0x20000000, LENGTH = 264K
+
+    /* OPTION B: Keep the unstriped sections separate */
+    /* RAM: ORIGIN = 0x20000000, LENGTH = 256K        */
+    /* SCRATCH_A: ORIGIN = 0x20040000, LENGTH = 4K    */
+    /* SCRATCH_B: ORIGIN = 0x20041000, LENGTH = 4K    */
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..dfcf4e9
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,202 @@
+#![warn(clippy::pedantic)]
+#![no_std]
+#![no_main]
+
+use cyw43::Control;
+use cyw43_pio::{DEFAULT_CLOCK_DIVIDER, PioSpi};
+use defmt::{info, unwrap};
+use embassy_executor::Spawner;
+use embassy_futures::select::{Either, select};
+use embassy_rp::bind_interrupts;
+use embassy_rp::config::Config;
+use embassy_rp::gpio::{self, Input};
+use embassy_rp::peripherals::{DMA_CH0, PIO0};
+use embassy_rp::pio::{InterruptHandler, Pio};
+use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
+use embassy_sync::channel::{Channel, Sender};
+use embassy_time::{Duration, Instant, Timer};
+use gpio::{Level, Output};
+use static_cell::StaticCell;
+use {defmt_rtt as _, panic_probe as _};
+
+const ONE_MINUTE_SECONDS: u64 = 60;
+const ONE_HOUR_SECONDS: u64 = ONE_MINUTE_SECONDS * 60;
+const ONE_DAY_SECONDS: u64 = ONE_HOUR_SECONDS * 24;
+
+const FRESH_TO_STALE_DURATION: Duration = Duration::from_secs(ONE_DAY_SECONDS);
+const STALE_TO_OLD_DURATION: Duration = Duration::from_secs(ONE_DAY_SECONDS);
+
+bind_interrupts!(struct Irqs {
+    PIO0_IRQ_0 => InterruptHandler<PIO0>;
+});
+
+#[embassy_executor::task]
+async fn cyw43_task(
+    runner: cyw43::Runner<'static, Output<'static>, PioSpi<'static, PIO0, 0, DMA_CH0>>,
+) -> ! {
+    runner.run().await
+}
+
+#[derive(Clone, Copy)]
+enum WaterState {
+    Fresh,
+    Stale,
+    Old,
+}
+
+impl WaterState {
+    fn decay(&mut self) {
+        match self {
+            Self::Fresh => *self = Self::Stale,
+            Self::Stale => *self = Self::Old,
+            Self::Old => (),
+        }
+    }
+
+    fn refill(&mut self) {
+        *self = Self::Fresh;
+    }
+
+    fn timer(self) -> Timer {
+        match self {
+            WaterState::Fresh => Timer::after(FRESH_TO_STALE_DURATION),
+            WaterState::Stale => Timer::after(STALE_TO_OLD_DURATION),
+            // I hope oolong has been watered after this long...
+            WaterState::Old => Timer::at(Instant::MAX),
+        }
+    }
+}
+
+#[derive(Clone, Copy)]
+enum ChannelMessage {
+    Refilled,
+}
+static CHANNEL: Channel<CriticalSectionRawMutex, ChannelMessage, 8> = Channel::new();
+
+#[embassy_executor::task]
+async fn button(
+    mut input: Input<'static>,
+    sender: Sender<'static, CriticalSectionRawMutex, ChannelMessage, 8>,
+) {
+    loop {
+        info!("Waiting for falling edge");
+        input.wait_for_falling_edge().await;
+        sender.send(ChannelMessage::Refilled).await;
+        input.wait_for_high().await;
+    }
+}
+
+#[embassy_executor::task]
+async fn heartbeat(mut control: Control<'static>) {
+    loop {
+        info!("Heartbeating!");
+        control.gpio_set(0, true).await;
+        Timer::after(Duration::from_millis(1)).await;
+        control.gpio_set(0, false).await;
+        Timer::after(Duration::from_secs(10)).await;
+    }
+}
+
+#[embassy_executor::main]
+async fn main(spawner: Spawner) {
+    // let p = embassy_rp::init(Default::default());
+    // let mut led = Output::new(p.PIN_18, Level::Low);
+
+    // loop {
+    //     info!("led on!");
+    //     led.set_high();
+    //     Timer::after_secs(1).await;
+
+    //     info!("led off!");
+    //     led.set_low();
+    //     Timer::after_secs(1).await;
+    // }
+
+    let p = embassy_rp::init(Config::default());
+    let fw = include_bytes!("../embassy/cyw43-firmware/43439A0.bin");
+    let clm = include_bytes!("../embassy/cyw43-firmware/43439A0_clm.bin");
+
+    // To make flashing faster for development, you may want to flash the firmwares independently
+    // at hardcoded addresses, instead of baking them into the program with `include_bytes!`:
+    //     probe-rs download ../../cyw43-firmware/43439A0.bin --binary-format bin --chip RP2040 --base-address 0x10100000
+    //     probe-rs download ../../cyw43-firmware/43439A0_clm.bin --binary-format bin --chip RP2040 --base-address 0x10140000
+    //let fw = unsafe { core::slice::from_raw_parts(0x10100000 as *const u8, 230321) };
+    //let clm = unsafe { core::slice::from_raw_parts(0x10140000 as *const u8, 4752) };
+
+    let pwr = Output::new(p.PIN_23, Level::Low);
+    let cs = Output::new(p.PIN_25, Level::High);
+    let mut pio = Pio::new(p.PIO0, Irqs);
+    let spi = PioSpi::new(
+        &mut pio.common,
+        pio.sm0,
+        DEFAULT_CLOCK_DIVIDER,
+        pio.irq0,
+        cs,
+        p.PIN_24,
+        p.PIN_29,
+        p.DMA_CH0,
+    );
+
+    let (_net_device, mut control, runner) = {
+        static STATE: StaticCell<cyw43::State> = StaticCell::new();
+        let state = STATE.init(cyw43::State::new());
+        cyw43::new(state, pwr, spi, fw).await
+    };
+
+    unwrap!(spawner.spawn(cyw43_task(runner)));
+
+    control.init(clm).await;
+    control
+        .set_power_management(cyw43::PowerManagementMode::Aggressive)
+        .await;
+    unwrap!(spawner.spawn(heartbeat(control)));
+
+    unwrap!(spawner.spawn(button(
+        {
+            let input = Input::new(p.PIN_15, gpio::Pull::Up);
+            input
+        },
+        CHANNEL.sender()
+    )));
+
+    let recv = CHANNEL.receiver();
+
+    let mut water_state = WaterState::Fresh;
+    let mut timer = water_state.timer();
+    let mut red_led = Output::new(p.PIN_13, Level::Low);
+    let mut yellow_led = Output::new(p.PIN_18, Level::Low);
+
+    loop {
+        match select(&mut timer, recv.receive()).await {
+            Either::First(()) => {
+                info!("Timer decay received");
+                water_state.decay();
+                set_leds(water_state, &mut yellow_led, &mut red_led);
+                timer = water_state.timer();
+            }
+            Either::Second(ChannelMessage::Refilled) => {
+                info!("Water refilled received");
+                water_state.refill();
+                set_leds(water_state, &mut yellow_led, &mut red_led);
+                timer = water_state.timer();
+            }
+        }
+    }
+}
+
+fn set_leds(water_state: WaterState, yellow_led: &mut Output, red_led: &mut Output) {
+    match water_state {
+        WaterState::Fresh => {
+            yellow_led.set_low();
+            red_led.set_low();
+        }
+        WaterState::Stale => {
+            yellow_led.set_high();
+            red_led.set_low();
+        }
+        WaterState::Old => {
+            yellow_led.set_low();
+            red_led.set_high();
+        }
+    }
+}