refactor for streamlining

tutorial/07-button-input/.cargo/config.toml

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+[target.thumbv7m-none-eabi]
+runner = "probe-rs run --chip STM32F103C8"
+rustflags = [
+  "-C", "link-arg=-Tlink.x",
+  "-C", "link-arg=-Tdefmt.x",
+]
+
+[build]
+target = "thumbv7m-none-eabi"
+
+[env]
+DEFMT_LOG = "info"

tutorial/07-button-input/Cargo.toml

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+[package]
+name = "button_input_task"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+cortex-m = "0.7.7"
+cortex-m-rt = "0.7.5"
+defmt = "0.3.10"
+defmt-rtt = "0.4.2"
+panic-probe = { version = "0.3.2", features = ["print-defmt"] }
+nb = "1.1.0"
+
+[dependencies.stm32f1xx-hal]
+version = "0.11.0"
+features = ["rt", "stm32f103", "medium"]
+
+[profile.release]
+codegen-units = 1
+debug = 2
+lto = true
+opt-level = "z"

tutorial/07-button-input/README.md

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+# 07 - Button Input 
+
+Button an PA0 (Pull-up) lesen und Press/Release als Log ausgeben.

tutorial/07-button-input/memory.x

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+MEMORY
+{
+  FLASH : ORIGIN = 0x08000000, LENGTH = 64K
+  RAM   : ORIGIN = 0x20000000, LENGTH = 20K
+}

tutorial/07-button-input/rust-toolchain.toml

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+[toolchain]
+channel = "stable"
+components = ["rustfmt"]
+targets = ["thumbv7m-none-eabi"]

tutorial/07-button-input/src/main.rs

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+#![no_std]
+#![no_main]
+
+use cortex_m_rt::entry;
+use defmt::info;
+use nb::block;
+use stm32f1xx_hal::{pac, prelude::*, timer::Timer};
+use {defmt_rtt as _, panic_probe as _};
+
+#[entry]
+fn main() -> ! {
+    let cp = cortex_m::Peripherals::take().unwrap();
+    let dp = pac::Peripherals::take().unwrap();
+
+    let mut rcc = dp.RCC.constrain();
+    let mut gpioa = dp.GPIOA.split(&mut rcc);
+
+    // TODO: Button wiring: PA0 -> button -> GND
+
+    let mut timer = Timer::syst(cp.SYST, &rcc.clocks).counter_hz();
+    timer.start(40.Hz()).unwrap();
+
+    let mut last_pressed = false;
+
+    loop {
+        
+        // TODO: get the current button status
+        // TODO: print a message when the button is pressed and released
+
+        // Poll at 25ms to avoid too much log spam.
+        block!(timer.wait()).unwrap();
+    }
+}

tutorial/07-button-input/src/solution.rs

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+#![no_std]
+#![no_main]
+
+use cortex_m_rt::entry;
+use defmt::info;
+use nb::block;
+use stm32f1xx_hal::{pac, prelude::*, timer::Timer};
+use {defmt_rtt as _, panic_probe as _};
+
+#[entry]
+fn main() -> ! {
+    let cp = cortex_m::Peripherals::take().unwrap();
+    let dp = pac::Peripherals::take().unwrap();
+
+    let mut rcc = dp.RCC.constrain();
+    let mut gpioa = dp.GPIOA.split(&mut rcc);
+    let button = gpioa.pa0.into_pull_up_input(&mut gpioa.crl);
+
+    let mut timer = Timer::syst(cp.SYST, &rcc.clocks).counter_hz();
+    timer.start(40.Hz()).unwrap();
+
+    let mut last_pressed = false;
+
+    loop {
+        let pressed = button.is_low();
+        if pressed != last_pressed {
+            if pressed {
+                info!("button: pressed");
+            } else {
+                info!("button: released");
+            }
+            last_pressed = pressed;
+        }
+
+        block!(timer.wait()).unwrap();
+    }
+}