From 23227df215904f9e2fdd0e719cc70dd173740bcd Mon Sep 17 00:00:00 2001
From: shimun <shimun@shimun.net>
Date: Mon, 9 Jan 2023 16:27:30 +0100
Subject: [PATCH] init

---
 .gitattributes |   1 +
 .gitignore     |   1 +
 Cargo.lock     | 737 +++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml     |  20 ++
 flake.nix      |  59 ++++
 src/main.rs    |  88 ++++++
 6 files changed, 906 insertions(+)
 create mode 100644 .gitattributes
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 flake.nix
 create mode 100644 src/main.rs

diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..858736a
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+target/riscv32imc-unknown-none-elf/release/esp32c3 filter=lfs diff=lfs merge=lfs -text
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..a1e84ec
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,737 @@
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+ "regex-syntax",
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+ "bytemuck",
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+ "embedded-hal 0.2.7",
+]
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+ "bit_field",
+ "critical-section",
+ "embedded-hal 0.2.7",
+]
+
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+ "riscv 0.10.0",
+ "riscv-rt",
+ "riscv-target",
+]
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+ "r0",
+ "riscv 0.9.0",
+ "riscv-rt-macros",
+ "riscv-target",
+]
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+ "syn",
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+ "lock_api",
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+[[package]]
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+ "atomic-polyfill 1.0.1",
+]
+
+[[package]]
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
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+[[package]]
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+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
+[[package]]
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+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..4b1c36b
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,20 @@
+[package]
+name = "esp32c3"
+version = "0.1.0"
+edition = "2021"
+authors = [ "Marvin Drescher <m@sparv.in>" ]
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+critical-section  = "1.1.1"
+embassy-executor  = { package = "embassy-executor", git = "https://github.com/embassy-rs/embassy/", rev = "eed34f9", features = ["nightly", "integrated-timers"] }
+embassy-time = { version = "0.1.0", features = ["nightly"] }
+embedded-hal = "0.2.7"
+esp-backtrace = { version = "0.4.0", features = ["esp32c3", "exception-handler", "panic-handler"] }
+esp-hal-common = { version = "0.4.0", features = ["esp32c3"] }
+esp-println = { version = "0.3.1", features = ["esp32c3"] }
+esp32c3-hal = { version = "0.4.0", features = ["embassy", "embassy-time", "embassy-time-timg0", "smartled",  "embedded-hal-async", "async", "direct-boot"] }
+riscv = "0.10.0"
+riscv-rt = "0.10.0"
+static_cell = "1.0.0"
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..9fda7e0
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,59 @@
+{
+  inputs = {
+    fenix.url = "github:nix-community/fenix";
+    flake-utils.url = "github:numtide/flake-utils";
+    naersk.url = "github:nix-community/naersk";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  };
+
+  outputs = { self, fenix, flake-utils, naersk, nixpkgs }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = (import nixpkgs) {
+          inherit system;
+        };
+
+        fenix' = fenix.packages.${system}; 
+
+        toolchain = with fenix';
+          combine [
+            minimal.rustc
+            minimal.cargo
+            targets.riscv32imc-unknown-none-elf.latest.rust-std # ESP32-C3 RISC-V
+            targets.riscv32imac-unknown-none-elf.latest.rust-std # ESP32-C3 RISC-V \w atomic emulation
+          ];
+
+        naersk' = naersk.lib.${system}.override {
+          cargo = toolchain;
+          rustc = toolchain;
+        };
+
+      in rec {
+        defaultPackage = packages.riscv32-embedded;
+
+        packages.riscv32-embedded = naersk'.buildPackage rec {
+          src = self;
+
+          depsBuildBuild = with pkgs; [
+            pkgsCross.riscv32-embedded.stdenv.cc
+          ];
+
+          doCheck = true;
+          RUSTFLAGS="-C link-arg=-Tlinkall.x -C force-frame-pointers";
+          # CARGO_UNSTABLE_BUILD_STD = "true";
+          "CARGO_TARGET_${pkgs.lib.toUpper CARGO_BUILD_TARGET}_LINKER" = "riscv32-none-elf-gcc";
+          "CARGO_TARGET_${pkgs.lib.toUpper CARGO_BUILD_TARGET}_RUNNER" = "espflash --monitor";
+          CARGO_BUILD_TARGET = "riscv32imc-unknown-none-elf";
+          shellHook = ''
+
+          '';
+        };
+
+        devShell = with pkgs; mkShell ({
+          RUST_SRC_PATH = "${fenix'.complete.rust-src}/lib/rustlib/src/rust/library";
+          nativeBuildInputs = [ toolchain cargo-espmonitor cargo-espflash ] ++ defaultPackage.depsBuildBuild;
+        } // (lib.filterAttrs (name: _: lib.hasPrefix "CARGO_" name || lib.hasPrefix "RUST" name) defaultPackage));
+      }
+    );
+}
+
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..3fb5ff8
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,88 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use embassy_executor::Executor;
+use embassy_time::{Duration, Timer};
+use esp32c3_hal::{clock::ClockControl, prelude::*, timer::TimerGroup, Rtc, embassy};
+use esp_backtrace as _;
+use esp_hal_common::{Bank0GpioRegisterAccess, GpioPin, InputOutputAnalogPinType, Unknown, IO, pac::Peripherals};
+use static_cell::StaticCell;
+
+#[embassy_executor::task]
+async fn run1() {
+    loop {
+        esp_println::println!("Hello world from embassy using esp-hal-async!");
+        Timer::after(Duration::from_millis(1_000)).await;
+        esp_println::println!("Just woke up");
+    }
+}
+
+#[embassy_executor::task]
+async fn run2() {
+    loop {
+        esp_println::println!("Bing!");
+        Timer::after(Duration::from_millis(5_000)).await;
+    }
+}
+
+#[embassy_executor::task]
+async fn run_io(io: IO) {
+    let led = io.pins.gpio1;
+    blink_led(led).await;
+}
+
+async fn blink_led<const N: u8>(
+    pin: GpioPin<Unknown, Bank0GpioRegisterAccess, InputOutputAnalogPinType, N>,
+) {
+    let mut led = pin.into_push_pull_output();
+    let mut on = true;
+    loop {
+        if on {
+            esp_println::println!("On!");
+        } else {
+            esp_println::println!("Off!");
+        }
+        Timer::after(Duration::from_millis(5_00)).await;
+        on = !on;
+    }
+}
+
+static EXECUTOR: StaticCell<Executor> = StaticCell::new();
+
+#[riscv_rt::entry]
+fn main() -> ! {
+    esp_println::println!("Init!");
+    let peripherals = Peripherals::take().unwrap();
+    let system = peripherals.SYSTEM.split();
+    let clocks = ClockControl::boot_defaults(system.clock_control).freeze();
+
+    let mut rtc = Rtc::new(peripherals.RTC_CNTL);
+    let timer_group0 = TimerGroup::new(peripherals.TIMG0, &clocks);
+    let mut wdt0 = timer_group0.wdt;
+    let timer_group1 = TimerGroup::new(peripherals.TIMG1, &clocks);
+    let mut wdt1 = timer_group1.wdt;
+
+    // Disable watchdog timers
+    rtc.swd.disable();
+    rtc.rwdt.disable();
+    wdt0.disable();
+    wdt1.disable();
+
+ // embassy::init(
+ //     &clocks,
+ //     esp32c3_hal::systimer::SystemTimer::new(peripherals.SYSTIMER),
+ // );
+
+    embassy::init(&clocks, timer_group0.timer0);
+
+    let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
+
+    let executor = EXECUTOR.init(Executor::new());
+    executor.run(move |spawner| {
+        spawner.spawn(run1()).ok();
+        spawner.spawn(run2()).ok();
+        let res = spawner.spawn(run_io(io));
+        esp_println::println!("{res:?}");
+    });
+}