GPIO features

CHANGELOG.md

@@ -15,6 +15,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Support for the onboard real-time clock (RTC) ([#136](https://github.com/stm32-rs/stm32f3xx-hal/pull/136))
 - Enable DMA for USART on `stm32f302` devices ([#139](https://github.com/stm32-rs/stm32f3xx-hal/pull/139))
 
+### Changed
+
+- Introduced auto-generated GPIO mappings based on the STM32CubeMX database
+  ([#129](https://github.com/stm32-rs/stm32f3xx-hal/pull/129))
+
 ## [v0.5.0] - 2020-07-21
 
 ### Added

Cargo.toml

@@ -16,13 +16,15 @@ features = ["stm32f303xc", "rt", "stm32-usbd"]
 targets = ["thumbv7em-none-eabihf"]
 
 [dependencies]
+cfg-if = "0.1"
 cortex-m = "0.6"
 cortex-m-rt = "0.6"
 embedded-dma = "0.1"
 embedded-hal = "0.2"
 nb = "0.1"
-stm32f3 = "0.11"
+paste = "1"
 rtcc = "0.2"
+stm32f3 = "0.12"
 
 [dependencies.bare-metal]
 version = "0.2"
@@ -53,30 +55,36 @@ device-selected = []
 direct-call-deprecated = []
 rt = ["stm32f3/rt"]
 
+gpio-f302 = []
+gpio-f303 = []
+gpio-f303e = []
+gpio-f333 = []
+gpio-f373 = []
+
 # Any Changes here should be mirrored in README.md, src/lib.rs, and
 # .github/workflows/ci.yml.
-stm32f301 = ["stm32f3/stm32f301", "device-selected"]
-stm32f318 = ["stm32f3/stm32f301", "device-selected"]
+stm32f301 = ["gpio-f302", "stm32f3/stm32f301", "device-selected"]
+stm32f318 = ["gpio-f302", "stm32f3/stm32f301", "device-selected"]
 stm32f302 = ["stm32f3/stm32f302", "direct-call-deprecated"]
-stm32f302xb = ["stm32f302", "device-selected"]
-stm32f302xc = ["stm32f302", "device-selected"]
-stm32f302xd = ["stm32f302", "device-selected"]
-stm32f302xe = ["stm32f302", "device-selected"]
-stm32f302x6 = ["stm32f302", "device-selected"]
-stm32f302x8 = ["stm32f302", "device-selected"]
+stm32f302x6 = ["stm32f302", "gpio-f302", "device-selected"]
+stm32f302x8 = ["stm32f302", "gpio-f302", "device-selected"]
+stm32f302xb = ["stm32f302", "gpio-f303", "device-selected"]
+stm32f302xc = ["stm32f302", "gpio-f303", "device-selected"]
+stm32f302xd = ["stm32f302", "gpio-f303e", "device-selected"]
+stm32f302xe = ["stm32f302", "gpio-f303e", "device-selected"]
 stm32f303 = ["stm32f3/stm32f303", "direct-call-deprecated"]
-stm32f303xb = ["stm32f303", "stm32-usbd/ram_access_1x16", "device-selected"]
-stm32f303xc = ["stm32f303", "stm32-usbd/ram_access_1x16", "device-selected"]
-stm32f303xd = ["stm32f303", "stm32-usbd/ram_access_2x16", "device-selected"]
-stm32f303xe = ["stm32f303", "stm32-usbd/ram_access_2x16", "device-selected"]
-stm32f303x6 = ["stm32f303", "device-selected"]
-stm32f303x8 = ["stm32f303", "device-selected"]
-stm32f373 = ["stm32f3/stm32f373", "device-selected"]
-stm32f378 = ["stm32f3/stm32f373", "device-selected"]
-stm32f334 = ["stm32f3/stm32f3x4", "device-selected"]
-stm32f328 = ["stm32f3/stm32f3x8", "device-selected"]
-stm32f358 = ["stm32f3/stm32f3x8", "device-selected"]
-stm32f398 = ["stm32f3/stm32f3x8", "device-selected"]
+stm32f303x6 = ["stm32f303", "gpio-f333", "device-selected"]
+stm32f303x8 = ["stm32f303", "gpio-f333", "device-selected"]
+stm32f303xb = ["stm32f303", "gpio-f303", "stm32-usbd/ram_access_1x16", "device-selected"]
+stm32f303xc = ["stm32f303", "gpio-f303", "stm32-usbd/ram_access_1x16", "device-selected"]
+stm32f303xd = ["stm32f303", "gpio-f303e", "stm32-usbd/ram_access_2x16", "device-selected"]
+stm32f303xe = ["stm32f303", "gpio-f303e", "stm32-usbd/ram_access_2x16", "device-selected"]
+stm32f373 = ["gpio-f373", "stm32f3/stm32f373", "device-selected"]
+stm32f378 = ["gpio-f373", "stm32f3/stm32f373", "device-selected"]
+stm32f334 = ["gpio-f333", "stm32f3/stm32f3x4", "device-selected"]
+stm32f328 = ["gpio-f333", "stm32f3/stm32f3x8", "device-selected"]
+stm32f358 = ["gpio-f303", "stm32f3/stm32f3x8", "device-selected"]
+stm32f398 = ["gpio-f303e", "stm32f3/stm32f3x8", "device-selected"]
 
 [profile.dev]
 debug = true

codegen/.cargo/config

@@ -0,0 +1,2 @@
+[build]
+target = "x86_64-unknown-linux-gnu"

codegen/.gitignore

@@ -0,0 +1,2 @@
+/target/
+**/*.rs.bk

codegen/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "codegen"
+version = "0.1.0"
+authors = ["Jan Teske <[email protected]>"]
+edition = "2018"
+
+[dependencies]
+anyhow = "1"
+once_cell = "1"
+regex = "1"
+serde-xml-rs = "0.4"
+
+[dependencies.structopt]
+version = "0.3"
+default-features = false
+
+[dependencies.serde]
+version = "1"
+features = ["derive"]

codegen/README.md

@@ -0,0 +1,56 @@
+# Codegen
+
+This crate provides code-generation for the stm32f3xx-hal. It reads information
+from an [STM32CubeMX](https://www.st.com/en/development-tools/stm32cubemx.html)
+database and uses that to output code that can directly be included into the
+source code of the stm32f3xx-hal crate.
+
+For more information on how the STM32CubeMX database is structured, check out
+the README in the [cube-parse](https://github.com/dbrgn/cube-parse) repository.
+
+Because by default cargo tries to use the `x86_64-unknown-linux-gnu` target,
+when building `codegen`, due to what's specified in the `.cargo/config`, you
+need to manually specify your host's target if it differs from that, e.g.:
+
+```
+$ cargo run --target x86_64-apple-darwin -- help
+```
+
+`codgen` can generate the following code:
+
+- [GPIO mappings](#gpio-mappings)
+
+## GPIO mappings
+
+Running `codegen`'s `gpio` subcommand generates the `gpio!` macro
+invocations at the end of `src/gpio.rs`. Re-generating those macro-invocations
+is simply a matter of deleting the old ones and then executing:
+
+```
+$ cargo run -- gpio $cubemx_db_path >> ../src/gpio.rs
+```
+
+`$cubemx_db_path` must be the path to the `db/` directory under an
+STM32CubeMX installation. With a default Linux install, this would be
+`/opt/stm32cubemx/db`.
+
+The generated `gpio!` invocations are gated by features whose names are derived
+from the respective GPIO internal peripheral (IP) version:
+
+- gpio-f302
+- gpio-f303
+- gpio-f303e
+- gpio-f333
+- gpio-f373
+
+`codegen` collects those IP versions from the relevant GPIO IP description
+files (located at `$cubemx_db_path/mcu/IP/GPIO-*.xml`). The root `<IP>` element
+has a `Version` attribute with a value in the form of "STM32Fxxx_gpio_v1_0".
+The feature name is constructed by dropping the parts constant between all
+version strings and prepending "gpio-".
+
+Note that the GPIO IP version names don't necessarily match the MCUs they are
+used in. For example, the GPIOs in `STM32F302xB` MCUs have the IP version
+"STM32F303_gpio_v1_0". The MCU features of the `stm32f3xx-hal` also select the
+correct `gpio-*` features, so users generally don't have to care about these
+details.

codegen/src/codegen/gpio.rs

@@ -0,0 +1,141 @@
+use crate::cubemx::ip::gpio;
+use anyhow::{Context, Result};
+use once_cell::sync::Lazy;
+use regex::Regex;
+use std::collections::HashMap;
+
+struct Port<'a> {
+    id: char,
+    pins: Vec<&'a gpio::Pin>,
+}
+
+pub fn gen_mappings(gpio_ips: &[gpio::Ip]) -> Result<()> {
+    for ip in gpio_ips.iter() {
+        println!();
+        gen_gpio_ip(ip)?;
+    }
+    Ok(())
+}
+
+fn gen_gpio_ip(ip: &gpio::Ip) -> Result<()> {
+    let feature = ip_version_to_feature(&ip.version)?;
+    let ports = merge_pins_by_port(&ip.pins)?;
+
+    println!(r#"#[cfg(feature = "{}")]"#, feature);
+    gen_gpio_macro_call(&ports, &feature)?;
+    Ok(())
+}
+
+fn ip_version_to_feature(ip_version: &str) -> Result<String> {
+    static VERSION: Lazy<Regex> =
+        Lazy::new(|| Regex::new(r"^STM32(?P<version>\w+)_gpio_v1_0$").unwrap());
+
+    let captures = VERSION
+        .captures(&ip_version)
+        .with_context(|| format!("invalid GPIO IP version: {}", ip_version))?;
+
+    let version = captures.name("version").unwrap().as_str();
+    let feature = format!("gpio-{}", version.to_lowercase());
+    Ok(feature)
+}
+
+fn merge_pins_by_port(pins: &[gpio::Pin]) -> Result<Vec<Port>> {
+    let mut pins_by_port = HashMap::new();
+    for pin in pins.iter() {
+        pins_by_port
+            .entry(pin.port()?)
+            .and_modify(|e: &mut Vec<_>| e.push(pin))
+            .or_insert_with(|| vec![pin]);
+    }
+
+    let mut ports = Vec::new();
+    for (id, mut pins) in pins_by_port {
+        pins.sort_by_key(|p| p.number().unwrap_or_default());
+        pins.dedup_by_key(|p| p.number().unwrap_or_default());
+        ports.push(Port { id, pins });
+    }
+    ports.sort_by_key(|p| p.id);
+
+    Ok(ports)
+}
+
+fn gen_gpio_macro_call(ports: &[Port], feature: &str) -> Result<()> {
+    println!("gpio!([");
+    for port in ports {
+        gen_port(port, feature)?;
+    }
+    println!("]);");
+    Ok(())
+}
+
+fn gen_port(port: &Port, feature: &str) -> Result<()> {
+    let pac_module = get_port_pac_module(port, feature);
+
+    println!("    {{");
+    println!(
+        "        port: ({}/{}, pac: {}),",
+        port.id,
+        port.id.to_lowercase(),
+        pac_module,
+    );
+    println!("        pins: [");
+
+    for pin in &port.pins {
+        gen_pin(pin)?;
+    }
+
+    println!("        ],");
+    println!("    }},");
+    Ok(())
+}
+
+fn get_port_pac_module(port: &Port, feature: &str) -> &'static str {
+    // The registers in ports A and B have different reset values due to the
+    // presence of debug pins, so they get dedicated PAC modules.
+    match port.id {
+        'A' => "gpioa",
+        'B' => "gpiob",
+        'D' if feature == "gpio-f373" => "gpiod",
+        _ => "gpioc",
+    }
+}
+
+fn gen_pin(pin: &gpio::Pin) -> Result<()> {
+    let nr = pin.number()?;
+    let reset_mode = get_pin_reset_mode(pin)?;
+    let afr = if nr < 8 { 'L' } else { 'H' };
+    let af_numbers = get_pin_af_numbers(pin)?;
+
+    println!(
+        "            {} => {{ reset: {}, afr: {}/{}, af: {:?} }},",
+        nr,
+        reset_mode,
+        afr,
+        afr.to_lowercase(),
+        af_numbers,
+    );
+
+    Ok(())
+}
+
+fn get_pin_reset_mode(pin: &gpio::Pin) -> Result<&'static str> {
+    // Debug pins default to their debug function (AF0), everything else
+    // defaults to floating input.
+    let mode = match (pin.port()?, pin.number()?) {
+        ('A', 13) | ('A', 14) | ('A', 15) | ('B', 3) | ('B', 4) => "AF0",
+        _ => "Input<Floating>",
+    };
+    Ok(mode)
+}
+
+fn get_pin_af_numbers(pin: &gpio::Pin) -> Result<Vec<u8>> {
+    let mut numbers = Vec::new();
+    for signal in &pin.pin_signals {
+        numbers.push(signal.af()?);
+    }
+
+    numbers.sort();
+    numbers.dedup();
+
+    Ok(numbers)
+}

codegen/src/codegen/mod.rs

@@ -0,0 +1,11 @@
+pub mod gpio;
+
+use crate::cubemx::package::Package;
+
+pub fn gen_autogen_comment(package: &Package) {
+    println!("// auto-generated using codegen");
+    println!(
+        "// STM32CubeMX DB release: {}",
+        package.pack_description.release
+    );
+}

codegen/src/cubemx/db.rs

@@ -0,0 +1,33 @@
+use anyhow::{Context, Result};
+use serde::Deserialize;
+use std::{
+    fs::File,
+    path::{Path, PathBuf},
+};
+
+pub struct Db {
+    root: PathBuf,
+}
+
+impl Db {
+    pub fn new<P: Into<PathBuf>>(root: P) -> Self {
+        Self { root: root.into() }
+    }
+
+    pub fn load<'de, P: AsRef<Path>, T: Deserialize<'de>>(&self, name: P) -> Result<T> {
+        let name = name.as_ref();
+        let mut path = self.root.join(name);
+        path.set_extension("xml");
+
+        let file = File::open(&path).with_context(|| format!("cannot open DB file: {:?}", path))?;
+        serde_xml_rs::de::from_reader(file)
+            .with_context(|| format!("cannot parse DB file: {:?}", path))
+    }
+
+    pub fn load_mcu<'de, P: AsRef<Path>, T: Deserialize<'de>>(&self, name: P) -> Result<T> {
+        let mut mcu_path = PathBuf::new();
+        mcu_path.push("mcu");
+        mcu_path.push(name);
+        self.load(&mcu_path)
+    }
+}