Add RP2040 QT PY Example

Signed-off-by: Daniel Schaefer <dhs@frame.work>

.gitignore

@@ -1,6 +1,6 @@
 # Generated by Cargo
 # will have compiled files and executables
-/target/
+target
 
 # Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
 # More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html

examples/qt-py-rp2040/.cargo/config.toml

@@ -0,0 +1,12 @@
+[build]
+target = "thumbv6m-none-eabi"
+
+[target.thumbv6m-none-eabi]
+runner = "elf2uf2-rs -d"
+# runner = "picotool load -x -t elf"
+# runner = "probe-run --chip RP2040"
+
+rustflags = [
+  "-C", "link-arg=-Tlink.x",
+  "-C", "link-arg=--nmagic",
+]

examples/qt-py-rp2040/Cargo.toml

@@ -0,0 +1,19 @@
+[package] 
+edition = "2021"
+name = "is31fl3741-qt-py-rp2040"
+version = "0.3.0"
+
+[dependencies]
+embedded-hal = "0.2.7"
+embedded-graphics-core = { optional = true, version = "0.4.0" }
+
+cortex-m-rt = "0.7.3"
+cortex-m = "0.7.7"
+panic-halt = "0.2.0"
+rp-pico = "0.7.0"
+adafruit-qt-py-rp2040 = {version = "0.6.0", features = ["rt"]}
+tinybmp = "0.5.0"
+embedded-graphics = "0.8.1"
+fugit = "0.3.7"
+
+is31fl3743a = { path = "../.." }

examples/qt-py-rp2040/build.rs

@@ -0,0 +1,31 @@
+//! 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");
+}

examples/qt-py-rp2040/memory.x

@@ -0,0 +1,15 @@
+MEMORY {
+    BOOT2 : ORIGIN = 0x10000000, LENGTH = 0x100
+    FLASH : ORIGIN = 0x10000100, LENGTH = 2048K - 0x100
+    RAM   : ORIGIN = 0x20000000, LENGTH = 256K
+}
+
+EXTERN(BOOT2_FIRMWARE)
+
+SECTIONS {
+    /* ### Boot loader */
+    .boot2 ORIGIN(BOOT2) :
+    {
+        KEEP(*(.boot2));
+    } > BOOT2
+} INSERT BEFORE .text;

examples/qt-py-rp2040/src/main.rs

@@ -0,0 +1,77 @@
+#![no_std]
+#![no_main]
+
+// pick a panicking behavior
+use panic_halt as _;
+
+use adafruit_qt_py_rp2040::entry;
+use adafruit_qt_py_rp2040::{
+    hal::{
+        clocks::{init_clocks_and_plls, Clock},
+        i2c::I2C,
+        pac,
+        watchdog::Watchdog,
+        Sio,
+    },
+    Pins, XOSC_CRYSTAL_FREQ,
+};
+use fugit::RateExtU32;
+use is31fl3743a::devices::UnknownDevice;
+
+#[entry]
+fn main() -> ! {
+    let mut pac = pac::Peripherals::take().unwrap();
+    let core = pac::CorePeripherals::take().unwrap();
+
+    let mut watchdog = Watchdog::new(pac.WATCHDOG);
+
+    let clocks = init_clocks_and_plls(
+        XOSC_CRYSTAL_FREQ,
+        pac.XOSC,
+        pac.CLOCKS,
+        pac.PLL_SYS,
+        pac.PLL_USB,
+        &mut pac.RESETS,
+        &mut watchdog,
+    )
+    .ok()
+    .unwrap();
+
+    let mut delay = cortex_m::delay::Delay::new(core.SYST, clocks.system_clock.freq().to_Hz());
+    let sio = Sio::new(pac.SIO);
+    let pins = Pins::new(
+        pac.IO_BANK0,
+        pac.PADS_BANK0,
+        sio.gpio_bank0,
+        &mut pac.RESETS,
+    );
+
+    // Using STEMMA QT connector
+    let sda = pins.sda1.into_mode(); // gpio22
+    let scl = pins.scl1.into_mode(); // gpio23
+
+    //let sda = pins.sda.into_mode(); // gpio24
+    //let scl = pins.scl.into_mode(); // gpio25
+
+    let i2c = I2C::i2c1(
+        pac.I2C1,
+        sda,
+        scl,
+        400.kHz(),
+        &mut pac.RESETS,
+        125_000_000.Hz(),
+    );
+
+    let mut matrix = UnknownDevice::configure(i2c);
+    matrix
+        .setup(&mut delay)
+        .expect("failed to setup rgb controller");
+
+    matrix.set_scaling(0xFF).expect("failed to set scaling");
+
+    loop {
+        matrix.device.fill(0xFF).expect("couldn't turn on");
+        delay.delay_ms(100u32);
+        matrix.device.fill(0x00).expect("couldn't turn off");
+    }
+}