From d4e883ce8dfa848e55323a232c31cbcde5ad6c43 Mon Sep 17 00:00:00 2001
From: VersBinarii <versbinarii@gmail.com>
Date: Mon, 18 Apr 2022 10:29:26 +0200
Subject: [PATCH] Add RTIC based example for stm32f411 BlackPill

---
 Cargo.toml       |  13 ++++++
 examples/rtic.rs | 109 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 122 insertions(+)
 create mode 100644 examples/rtic.rs

diff --git a/Cargo.toml b/Cargo.toml
index 670f078..4a6c429 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,7 +18,20 @@ embedded-hal = "1.0.0-alpha.7"
 optional = true
 version = "0.3"
 
+[dev-dependencies]
+cortex-m-rtic = "1.0.0"
+cortex-m = "0.7.3"
+cortex-m-rt = "0.7.0"
+defmt-rtt = "0.3.0"
+panic-semihosting = "0.6"
+
+[dev-dependencies.stm32f4xx-hal]
+version = "0.12.0"
+features = ["stm32f411"]
 
 [features]
 default = ["graphics"]
 graphics = ["embedded-graphics-core"]
+
+[[example]]
+name = "rtic"
diff --git a/examples/rtic.rs b/examples/rtic.rs
new file mode 100644
index 0000000..883cd71
--- /dev/null
+++ b/examples/rtic.rs
@@ -0,0 +1,109 @@
+//! cortex-m-rtic example
+//! Tested on BlackPill dev board with stm32f411ceu microcontroller
+//! The LCD RESET pin was hard puled to Vcc therefore
+//! DummyOutputPin was used as the reset pin
+
+#![no_main]
+#![no_std]
+
+#[rtic::app(device = stm32f4xx_hal::pac)]
+mod app {
+    use display_interface_spi::SPIInterface;
+    use embedded_graphics::{
+        mono_font::{ascii::FONT_6X10, MonoTextStyle},
+        pixelcolor::Rgb565,
+        prelude::*,
+        text::{Alignment, Text},
+    };
+    use embedded_hal::digital::{blocking::OutputPin, ErrorType, PinState};
+    use ili9341::{DisplaySize240x320, Ili9341, Orientation};
+    use stm32f4xx_hal::{
+        prelude::*,
+        spi::{Mode, NoMiso, Phase, Polarity},
+        timer::Channel,
+    };
+
+    #[derive(Default)]
+    pub struct DummyOutputPin;
+    impl ErrorType for DummyOutputPin {
+        type Error = ();
+    }
+
+    impl OutputPin for DummyOutputPin {
+        fn set_low(&mut self) -> Result<(), Self::Error> {
+            Ok(())
+        }
+        fn set_high(&mut self) -> Result<(), Self::Error> {
+            Ok(())
+        }
+        fn set_state(&mut self, _state: PinState) -> Result<(), Self::Error> {
+            Ok(())
+        }
+    }
+
+    #[shared]
+    struct Shared {}
+
+    #[local]
+    struct Local {}
+
+    #[init]
+    fn init(ctx: init::Context) -> (Shared, Local, init::Monotonics) {
+        let dp = ctx.device;
+
+        let rcc = dp.RCC.constrain();
+        let clocks = rcc.cfgr.use_hse(25.MHz()).sysclk(100.MHz()).freeze();
+
+        let gpioa = dp.GPIOA.split();
+        let gpiob = dp.GPIOB.split();
+
+        /*
+         *  The ILI9341 driver
+         */
+        let lcd_clk = gpiob.pb0.into_alternate();
+        let lcd_miso = NoMiso {};
+        let lcd_mosi = gpioa.pa10.into_alternate().internal_pull_up(true);
+        let lcd_dc = gpiob.pb1.into_push_pull_output();
+        let lcd_cs = gpiob.pb2.into_push_pull_output();
+        let mode = Mode {
+            polarity: Polarity::IdleLow,
+            phase: Phase::CaptureOnFirstTransition,
+        };
+        let lcd_spi = dp
+            .SPI5
+            .spi((lcd_clk, lcd_miso, lcd_mosi), mode, 2.MHz(), &clocks);
+        let spi_iface = SPIInterface::new(lcd_spi, lcd_dc, lcd_cs);
+        let dummy_reset = DummyOutputPin::default();
+        let mut delay = dp.TIM1.delay_us(&clocks);
+        let mut lcd = Ili9341::new(
+            spi_iface,
+            dummy_reset,
+            &mut delay,
+            Orientation::PortraitFlipped,
+            DisplaySize240x320,
+        )
+        .unwrap();
+
+        // Create a new character style
+        let style = MonoTextStyle::new(&FONT_6X10, Rgb565::RED);
+
+        // Create a text at position (20, 30) and draw it using the previously defined style
+        Text::with_alignment(
+            "First line\nSecond line",
+            Point::new(20, 30),
+            style,
+            Alignment::Center,
+        )
+        .draw(&mut lcd)
+        .unwrap();
+
+        (Shared {}, Local {}, init::Monotonics())
+    }
+
+    #[idle(local = [])]
+    fn idle(cx: idle::Context) -> ! {
+        loop {
+            cortex_m::asm::nop();
+        }
+    }
+}