Add pages with PAC and HAL examples.

src/SUMMARY.md

@@ -239,9 +239,9 @@
 - [`no_std`](bare-metal/no_std.md)
   - [A minimal example](bare-metal/minimal.md)
   - [`alloc`](bare-metal/alloc.md)
-- [Microcontrollers]()
-  - [PACs]()
-  - [HAL crates]()
+- [Microcontrollers](bare-metal/microcontrollers.md)
+  - [PACs](bare-metal/microcontrollers/pacs.md)
+  - [HAL crates](bare-metal/microcontrollers/hals.md)
   - [The type state pattern]()
 
 # Day 5A: Afternoon

src/bare-metal/microcontrollers.md

@@ -0,0 +1 @@
+# Microcontrollers

src/bare-metal/microcontrollers/examples/Cargo.lock

@@ -121,11 +121,12 @@ dependencies = [
 ]
 
 [[package]]
-name = "microcontroller-example"
+name = "microcontroller-examples"
 version = "0.1.0"
 dependencies = [
  "cortex-m-rt",
  "embedded-hal",
+ "gd32f1",
  "gd32f1x0-hal",
  "panic-halt",
 ]

src/bare-metal/microcontrollers/examples/Cargo.toml

@@ -1,10 +1,17 @@
 [package]
-name = "microcontroller-example"
+name = "microcontroller-examples"
 version = "0.1.0"
 edition = "2021"
 
 [dependencies]
 cortex-m-rt = "0.7.0"
 embedded-hal = "0.2.6"
+gd32f1 = { version = "0.6.0", features = ["gd32f130", "rt"] }
 gd32f1x0-hal = { version = "0.7.1", features = ["rt", "gd32f130x8"] }
 panic-halt = "0.2.0"
+
+[[bin]]
+name = "pac"
+
+[[bin]]
+name = "hal"

src/bare-metal/microcontrollers/examples/src/bin/hal.rs

@@ -19,17 +19,20 @@
 extern crate panic_halt as _;
 
 use cortex_m_rt::entry;
-use embedded_hal::digital::v2::OutputPin;
 use gd32f1x0_hal::{pac::Peripherals, prelude::*};
 
 #[entry]
 fn main() -> ! {
     let p = Peripherals::take().unwrap();
     let mut rcu = p.RCU.constrain();
+
+    // Enable GPIOC.
     let mut gpioc = p.GPIOC.split(&mut rcu.ahb);
 
+    // Configure PC9 as a push-pull output.
     let mut led = gpioc.pc9.into_push_pull_output(&mut gpioc.config);
 
+    // Set PC9 high to turn the LED on.
     led.set_high().unwrap();
 
     loop {}

src/bare-metal/microcontrollers/examples/src/bin/pac.rs

@@ -0,0 +1,41 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// ANCHOR: Example
+#![no_main]
+#![no_std]
+
+extern crate panic_halt as _;
+
+use cortex_m_rt::entry;
+use gd32f1::gd32f130::Peripherals;
+
+#[entry]
+fn main() -> ! {
+    let p = Peripherals::take().unwrap();
+    let gpioc = p.GPIOC;
+
+    // Enable GPIOC.
+    p.RCU.ahben.modify(|_, w| w.pcen().enabled());
+
+    // Configure PC9 as a push-pull output.
+    gpioc.pud.modify(|_, w| w.pud9().floating());
+    gpioc.omode.modify(|_, w| w.om9().push_pull());
+    gpioc.ctl.modify(|_, w| w.ctl9().output());
+
+    // Set PC9 high to turn the LED on.
+    gpioc.bop.write(|w| w.bop9().set());
+
+    loop {}
+}

src/bare-metal/microcontrollers/hals.md

@@ -0,0 +1,5 @@
+# HAL crates
+
+```rust,editable,compile_fail
+{{#include examples/src/bin/hal.rs:Example}}
+```

src/bare-metal/microcontrollers/pacs.md

@@ -0,0 +1,13 @@
+# PACs
+
+```rust,editable,compile_fail
+{{#include examples/src/bin/pac.rs:Example}}
+```
+
+<details>
+
+* `cortex-m-rt` provides the vector table, among other things.
+* If you `cargo install cargo-binutils` then you can run
+  `cargo objdump --bin pac -- -d --no-show-raw-insn` to see the resulting binary.
+
+</details>