Merge pull request #228 from embassy-rs/metapac2

stm32-metapac: add new codegen, allows pregenerating the entire pac

11 files changed, 561 insertions, 374 deletions

diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index b48b9feb3..8807114ba 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -112,3 +112,15 @@ jobs:
           toolchain: stable
       - name: Check fmt
         run: for i in embassy-*; do (cd $i; cargo fmt -- --check); done
+
+  metapac_gen:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+      - name: Generate pregenerated metapac
+        run: cd stm32-metapac/gen; cargo run --release
diff --git a/stm32-data b/stm32-data
-Subproject f07c793bbe81b01b2f3668177648f024ec1c8fb
+Subproject 679a1e238835ac67597c6327cc6fb7e29bec095
diff --git a/stm32-metapac/Cargo.toml b/stm32-metapac/Cargo.toml
index e7f0b22e9..4a434b17e 100644
--- a/stm32-metapac/Cargo.toml
+++ b/stm32-metapac/Cargo.toml
@@ -11,10 +11,7 @@ cortex-m-rt = { version = "0.6.8", optional = true }
 # BEGIN BUILD DEPENDENCIES
 # These are removed when generating the pre-generated crate using the tool at gen/.
 [build-dependencies]
-regex = "1.4.6"
-chiptool = { git = "https://github.com/embassy-rs/chiptool", rev = "86b77165078065058098e981d49d2dd213b2feba" }
-serde = { version = "1.0.123", features = [ "derive" ]}
-serde_yaml = "0.8.15"
+stm32-metapac-gen = { path = "./gen" }
 # END BUILD DEPENDENCIES
 
 [features]
diff --git a/stm32-metapac/build.rs b/stm32-metapac/build.rs
index 8118d8072..b44d98f3a 100644
--- a/stm32-metapac/build.rs
+++ b/stm32-metapac/build.rs
@@ -1,136 +1,10 @@
-use regex::Regex;
-use serde::Deserialize;
-use std::collections::{HashMap, HashSet};
 use std::env;
-use std::fmt::Write as _;
-use std::fs;
-use std::fs::File;
-use std::io::Write;
-use std::path::Path;
 use std::path::PathBuf;
-
-use chiptool::{generate, ir, transform};
-
-#[derive(Debug, Eq, PartialEq, Clone, Deserialize)]
-pub struct Chip {
-    pub name: String,
-    pub family: String,
-    pub line: String,
-    pub core: String,
-    pub flash: u32,
-    pub ram: u32,
-    pub gpio_af: String,
-    pub packages: Vec<Package>,
-    pub peripherals: HashMap<String, Peripheral>,
-    pub interrupts: HashMap<String, u32>,
-}
-
-#[derive(Debug, Eq, PartialEq, Clone, Deserialize)]
-pub struct Package {
-    pub name: String,
-    pub package: String,
-}
-
-#[derive(Debug, Eq, PartialEq, Clone, Deserialize)]
-pub struct Peripheral {
-    pub address: u32,
-    #[serde(default)]
-    pub kind: Option<String>,
-    #[serde(default)]
-    pub block: Option<String>,
-    #[serde(default)]
-    pub clock: Option<String>,
-    #[serde(default)]
-    pub pins: Vec<Pin>,
-}
-
-#[derive(Debug, Eq, PartialEq, Clone, Deserialize)]
-pub struct Pin {
-    pub pin: String,
-    pub signal: String,
-    pub af: Option<String>,
-}
-
-struct BlockInfo {
-    /// usart_v1/USART -> usart
-    module: String,
-    /// usart_v1/USART -> v1
-    version: String,
-    /// usart_v1/USART -> USART
-    block: String,
-}
-
-impl BlockInfo {
-    fn parse(s: &str) -> Self {
-        let mut s = s.split("/");
-        let module = s.next().unwrap();
-        let block = s.next().unwrap();
-        assert!(s.next().is_none());
-        let mut s = module.split("_");
-        let module = s.next().unwrap();
-        let version = s.next().unwrap();
-        assert!(s.next().is_none());
-        Self {
-            module: module.to_string(),
-            version: version.to_string(),
-            block: block.to_string(),
-        }
-    }
-}
-
-fn make_table(out: &mut String, name: &str, data: &Vec<Vec<String>>) {
-    write!(
-        out,
-        "#[macro_export]
-macro_rules! {} {{
-    ($($pat:tt => $code:tt;)*) => {{
-        macro_rules! __{}_inner {{
-            $(($pat) => $code;)*
-            ($_:tt) => {{}}
-        }}
-",
-        name, name
-    )
-    .unwrap();
-
-    for row in data {
-        write!(out, "        __{}_inner!(({}));\n", name, row.join(",")).unwrap();
-    }
-
-    write!(
-        out,
-        "    }};
-}}"
-    )
-    .unwrap();
-}
-
-fn find_reg_for_field<'c>(
-    rcc: &'c ir::IR,
-    reg_prefix: &str,
-    field_name: &str,
-) -> Option<(&'c str, &'c str)> {
-    rcc.fieldsets.iter().find_map(|(name, fieldset)| {
-        if name.starts_with(reg_prefix) {
-            fieldset
-                .fields
-                .iter()
-                .find_map(|field| {
-                    if field_name == field.name {
-                        return Some(field.name.as_str());
-                    } else {
-                        None
-                    }
-                })
-                .map(|n| (name.as_str(), n))
-        } else {
-            None
-        }
-    })
-}
+use stm32_metapac_gen::*;
 
 fn main() {
-    let dir = "../stm32-data/data";
+    let out_dir = PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    let data_dir = PathBuf::from("../stm32-data/data");
 
     println!("cwd: {:?}", env::current_dir());
 
@@ -142,248 +16,16 @@ fn main() {
         .unwrap()
         .to_ascii_uppercase();
 
-    let chip_path = Path::new(&dir)
-        .join("chips")
-        .join(&format!("{}.yaml", chip_name));
-    let chip = fs::read(chip_path).unwrap();
-    let chip: Chip = serde_yaml::from_slice(&chip).unwrap();
-
-    let mut ir = ir::IR::new();
-
-    let mut dev = ir::Device {
-        interrupts: Vec::new(),
-        peripherals: Vec::new(),
-    };
-
-    // Load RCC register for chip
-    let rcc = chip.peripherals.iter().find_map(|(name, p)| {
-        if name == "RCC" {
-            p.block.as_ref().map(|block| {
-                let bi = BlockInfo::parse(block);
-                let rcc_reg_path = Path::new(&dir)
-                    .join("registers")
-                    .join(&format!("{}_{}.yaml", bi.module, bi.version));
-                serde_yaml::from_reader(File::open(rcc_reg_path).unwrap()).unwrap()
-            })
-        } else {
-            None
-        }
+    gen(Options {
+        out_dir: out_dir.clone(),
+        data_dir: data_dir.clone(),
+        chips: vec![chip_name.clone()],
     });
 
-    let mut peripheral_versions: HashMap<String, String> = HashMap::new();
-    let mut pin_table: Vec<Vec<String>> = Vec::new();
-    let mut interrupt_table: Vec<Vec<String>> = Vec::new();
-    let mut peripherals_table: Vec<Vec<String>> = Vec::new();
-    let mut peripheral_pins_table: Vec<Vec<String>> = Vec::new();
-    let mut peripheral_rcc_table: Vec<Vec<String>> = Vec::new();
-
-    let dma_base = chip
-        .peripherals
-        .get(&"DMA".to_string())
-        .unwrap_or_else(|| chip.peripherals.get(&"DMA1".to_string()).unwrap())
-        .address;
-    let dma_stride = 0x400;
-
-    let gpio_base = chip.peripherals.get(&"GPIOA".to_string()).unwrap().address;
-    let gpio_stride = 0x400;
-
-    for (name, p) in &chip.peripherals {
-        let mut ir_peri = ir::Peripheral {
-            name: name.clone(),
-            array: None,
-            base_address: p.address,
-            block: None,
-            description: None,
-            interrupts: HashMap::new(),
-        };
-
-        if let Some(block) = &p.block {
-            let bi = BlockInfo::parse(block);
-
-            for pin in &p.pins {
-                let mut row = Vec::new();
-                row.push(name.clone());
-                row.push(bi.module.clone());
-                row.push(bi.block.clone());
-                row.push(pin.pin.clone());
-                row.push(pin.signal.clone());
-                if let Some(ref af) = pin.af {
-                    row.push(af.clone());
-                }
-                peripheral_pins_table.push(row);
-            }
-
-            let mut peripheral_row = Vec::new();
-            peripheral_row.push(bi.module.clone());
-            peripheral_row.push(name.clone());
-            peripherals_table.push(peripheral_row);
-
-            if let Some(old_version) =
-                peripheral_versions.insert(bi.module.clone(), bi.version.clone())
-            {
-                if old_version != bi.version {
-                    panic!(
-                        "Peripheral {} has multiple versions: {} and {}",
-                        bi.module, old_version, bi.version
-                    );
-                }
-            }
-            ir_peri.block = Some(format!("{}::{}", bi.module, bi.block));
-
-            match bi.module.as_str() {
-                "gpio" => {
-                    let port_letter = name.chars().skip(4).next().unwrap();
-                    let port_num = port_letter as u32 - 'A' as u32;
-                    assert_eq!(p.address, gpio_base + gpio_stride * port_num);
-
-                    for pin_num in 0..16 {
-                        let pin_name = format!("P{}{}", port_letter, pin_num);
-                        pin_table.push(vec![
-                            pin_name.clone(),
-                            name.clone(),
-                            port_num.to_string(),
-                            pin_num.to_string(),
-                            format!("EXTI{}", pin_num),
-                        ]);
-                    }
-                }
-                "dma" => {
-                    let dma_num = if name == "DMA" {
-                        0
-                    } else {
-                        let dma_letter = name.chars().skip(3).next().unwrap();
-                        dma_letter as u32 - '1' as u32
-                    };
-                    assert_eq!(p.address, dma_base + dma_stride * dma_num);
-                }
-
-                _ => {}
-            }
-
-            if let Some(clock) = &p.clock {
-                if let Some(rcc) = &rcc {
-                    // Workaround for clock registers being split on some chip families. Assume fields are
-                    // named after peripheral and look for first field matching and use that register.
-                    let en = find_reg_for_field(&rcc, clock, &format!("{}EN", name));
-                    let rst = find_reg_for_field(&rcc, clock, &format!("{}RST", name));
-
-                    match (en, rst) {
-                        (Some((enable_reg, enable_field)), Some((reset_reg, reset_field))) => {
-                            peripheral_rcc_table.push(vec![
-                                name.clone(),
-                                enable_reg.to_ascii_lowercase(),
-                                reset_reg.to_ascii_lowercase(),
-                                format!("set_{}", enable_field.to_ascii_lowercase()),
-                                format!("set_{}", reset_field.to_ascii_lowercase()),
-                            ]);
-                        }
-                        (None, Some(_)) => {
-                            println!("Unable to find enable register for {}", name)
-                        }
-                        (Some(_), None) => {
-                            println!("Unable to find reset register for {}", name)
-                        }
-                        (None, None) => {
-                            println!("Unable to find enable and reset register for {}", name)
-                        }
-                    }
-                }
-            }
-        }
-
-        dev.peripherals.push(ir_peri);
-    }
-
-    for (name, &num) in &chip.interrupts {
-        dev.interrupts.push(ir::Interrupt {
-            name: name.clone(),
-            description: None,
-            value: num,
-        });
-
-        interrupt_table.push(vec![name.to_ascii_uppercase()]);
-    }
-
-    ir.devices.insert("".to_string(), dev);
-
-    let mut extra = format!(
-        "pub fn GPIO(n: usize) -> gpio::Gpio {{
-            gpio::Gpio(({} + {}*n) as _)
-        }}
-        pub fn DMA(n: usize) -> dma::Dma {{
-            dma::Dma(({} + {}*n) as _)
-        }}",
-        gpio_base, gpio_stride, dma_base, dma_stride,
+    println!(
+        "cargo:rustc-link-search={}/src/chips/{}",
+        out_dir.display(),
+        chip_name.to_ascii_lowercase()
     );
-
-    let peripheral_version_table = peripheral_versions
-        .iter()
-        .map(|(kind, version)| vec![kind.clone(), version.clone()])
-        .collect();
-
-    make_table(&mut extra, "pins", &pin_table);
-    make_table(&mut extra, "interrupts", &interrupt_table);
-    make_table(&mut extra, "peripherals", &peripherals_table);
-    make_table(&mut extra, "peripheral_versions", &peripheral_version_table);
-    make_table(&mut extra, "peripheral_pins", &peripheral_pins_table);
-    make_table(&mut extra, "peripheral_rcc", &peripheral_rcc_table);
-
-    for (module, version) in peripheral_versions {
-        println!("loading {} {}", module, version);
-
-        let regs_path = Path::new(&dir)
-            .join("registers")
-            .join(&format!("{}_{}.yaml", module, version));
-
-        let mut peri: ir::IR = serde_yaml::from_reader(File::open(regs_path).unwrap()).unwrap();
-
-        transform::expand_extends::ExpandExtends {}
-            .run(&mut peri)
-            .unwrap();
-
-        let prefix = module;
-        transform::map_names(&mut peri, |s, k| match k {
-            transform::NameKind::Block => format!("{}::{}", prefix, s),
-            transform::NameKind::Fieldset => format!("{}::regs::{}", prefix, s),
-            transform::NameKind::Enum => format!("{}::vals::{}", prefix, s),
-            _ => s.to_string(),
-        })
-        .unwrap();
-
-        ir.merge(peri);
-    }
-
-    // Cleanups!
-    transform::sort::Sort {}.run(&mut ir).unwrap();
-    transform::Sanitize {}.run(&mut ir).unwrap();
-
-    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
-
-    let items = generate::render(&ir).unwrap();
-    let mut file = File::create(out.join("pac.rs")).unwrap();
-    let data = items.to_string().replace("] ", "]\n");
-
-    // Remove inner attributes like #![no_std]
-    let re = Regex::new("# *! *\\[.*\\]").unwrap();
-    let data = re.replace_all(&data, "");
-    file.write_all(data.as_bytes()).unwrap();
-    file.write_all(extra.as_bytes()).unwrap();
-
-    let mut device_x = String::new();
-
-    for (name, _) in &chip.interrupts {
-        write!(
-            &mut device_x,
-            "PROVIDE({} = DefaultHandler);\n",
-            name.to_ascii_uppercase()
-        )
-        .unwrap();
-    }
-
-    File::create(out.join("device.x"))
-        .unwrap()
-        .write_all(device_x.as_bytes())
-        .unwrap();
-    println!("cargo:rustc-link-search={}", out.display());
     println!("cargo:rerun-if-changed=build.rs");
 }
diff --git a/stm32-metapac/gen/.vscode/settings.json b/stm32-metapac/gen/.vscode/settings.json
new file mode 100644
index 000000000..23fd35f0e
--- /dev/null
+++ b/stm32-metapac/gen/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+    "editor.formatOnSave": true
+}
\ No newline at end of file
diff --git a/stm32-metapac/gen/Cargo.toml b/stm32-metapac/gen/Cargo.toml
new file mode 100644
index 000000000..9151c821f
--- /dev/null
+++ b/stm32-metapac/gen/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "stm32-metapac-gen"
+version = "0.1.0"
+edition = "2018"
+
+
+[dependencies]
+regex = "1.4.6"
+chiptool = { git = "https://github.com/embassy-rs/chiptool", rev = "b905099423280cdc39a96bc51f0b669ddb443797" }
+serde = { version = "1.0.123", features = [ "derive" ]}
+serde_yaml = "0.8.15"
+syn = { version = "1.0", features = ["full","extra-traits"] }
diff --git a/stm32-metapac/gen/src/assets/build.rs b/stm32-metapac/gen/src/assets/build.rs
new file mode 100644
index 000000000..c16bd6407
--- /dev/null
+++ b/stm32-metapac/gen/src/assets/build.rs
@@ -0,0 +1,16 @@
+use std::env;
+
+fn main() {
+    let _chip_name = env::vars_os()
+        .map(|(a, _)| a.to_string_lossy().to_string())
+        .find(|x| x.starts_with("CARGO_FEATURE_STM32"))
+        .expect("No stm32xx Cargo feature enabled")
+        .strip_prefix("CARGO_FEATURE_")
+        .unwrap()
+        .to_ascii_lowercase();
+
+    #[cfg(feature = "rt")]
+    println!("cargo:rustc-link-search=src/chips/{}", _chip_name);
+
+    println!("cargo:rerun-if-changed=build.rs");
+}
diff --git a/stm32-metapac/gen/src/assets/lib_inner.rs b/stm32-metapac/gen/src/assets/lib_inner.rs
new file mode 100644
index 000000000..b7729cb3a
--- /dev/null
+++ b/stm32-metapac/gen/src/assets/lib_inner.rs
@@ -0,0 +1,6 @@
+// GEN PATHS HERE
+mod inner;
+
+pub mod common;
+
+pub use inner::*;
diff --git a/stm32-metapac/gen/src/lib.rs b/stm32-metapac/gen/src/lib.rs
new file mode 100644
index 000000000..c4090ccaf
--- /dev/null
+++ b/stm32-metapac/gen/src/lib.rs
@@ -0,0 +1,477 @@
+use regex::Regex;
+use serde::Deserialize;
+use std::collections::{HashMap, HashSet};
+use std::env;
+use std::fmt::Write as _;
+use std::fs;
+use std::fs::File;
+use std::io::Write;
+use std::path::Path;
+use std::path::PathBuf;
+
+use chiptool::{generate, ir, transform};
+
+#[derive(Debug, Eq, PartialEq, Clone, Deserialize)]
+pub struct Chip {
+    pub name: String,
+    pub family: String,
+    pub line: String,
+    pub core: String,
+    pub flash: u32,
+    pub ram: u32,
+    pub gpio_af: String,
+    pub packages: Vec<Package>,
+    pub peripherals: HashMap<String, Peripheral>,
+    pub interrupts: HashMap<String, u32>,
+}
+
+#[derive(Debug, Eq, PartialEq, Clone, Deserialize)]
+pub struct Package {
+    pub name: String,
+    pub package: String,
+}
+
+#[derive(Debug, Eq, PartialEq, Clone, Deserialize)]
+pub struct Peripheral {
+    pub address: u32,
+    #[serde(default)]
+    pub kind: Option<String>,
+    #[serde(default)]
+    pub block: Option<String>,
+    #[serde(default)]
+    pub clock: Option<String>,
+    #[serde(default)]
+    pub pins: Vec<Pin>,
+}
+
+#[derive(Debug, Eq, PartialEq, Clone, Deserialize)]
+pub struct Pin {
+    pub pin: String,
+    pub signal: String,
+    pub af: Option<String>,
+}
+
+struct BlockInfo {
+    /// usart_v1/USART -> usart
+    module: String,
+    /// usart_v1/USART -> v1
+    version: String,
+    /// usart_v1/USART -> USART
+    block: String,
+}
+
+impl BlockInfo {
+    fn parse(s: &str) -> Self {
+        let mut s = s.split("/");
+        let module = s.next().unwrap();
+        let block = s.next().unwrap();
+        assert!(s.next().is_none());
+        let mut s = module.split("_");
+        let module = s.next().unwrap();
+        let version = s.next().unwrap();
+        assert!(s.next().is_none());
+        Self {
+            module: module.to_string(),
+            version: version.to_string(),
+            block: block.to_string(),
+        }
+    }
+}
+
+fn find_reg_for_field<'c>(
+    rcc: &'c ir::IR,
+    reg_prefix: &str,
+    field_name: &str,
+) -> Option<(&'c str, &'c str)> {
+    rcc.fieldsets.iter().find_map(|(name, fieldset)| {
+        if name.starts_with(reg_prefix) {
+            fieldset
+                .fields
+                .iter()
+                .find_map(|field| {
+                    if field_name == field.name {
+                        return Some(field.name.as_str());
+                    } else {
+                        None
+                    }
+                })
+                .map(|n| (name.as_str(), n))
+        } else {
+            None
+        }
+    })
+}
+
+fn make_table(out: &mut String, name: &str, data: &Vec<Vec<String>>) {
+    write!(
+        out,
+        "#[macro_export]
+macro_rules! {} {{
+    ($($pat:tt => $code:tt;)*) => {{
+        macro_rules! __{}_inner {{
+            $(($pat) => $code;)*
+            ($_:tt) => {{}}
+        }}
+",
+        name, name
+    )
+    .unwrap();
+
+    for row in data {
+        write!(out, "        __{}_inner!(({}));\n", name, row.join(",")).unwrap();
+    }
+
+    write!(
+        out,
+        "    }};
+}}"
+    )
+    .unwrap();
+}
+
+pub struct Options {
+    pub chips: Vec<String>,
+    pub out_dir: PathBuf,
+    pub data_dir: PathBuf,
+}
+
+pub fn gen(options: Options) {
+    let generate_opts = generate::Options {
+        common_path: syn::parse_str("crate::common").unwrap(),
+    };
+
+    let out_dir = options.out_dir;
+    let data_dir = options.data_dir;
+
+    fs::create_dir_all(out_dir.join("src/peripherals")).unwrap();
+    fs::create_dir_all(out_dir.join("src/chips")).unwrap();
+
+    println!("cwd: {:?}", env::current_dir());
+
+    let mut all_peripheral_versions: HashSet<(String, String)> = HashSet::new();
+
+    for chip_name in &options.chips {
+        let chip_path = data_dir.join("chips").join(&format!("{}.yaml", chip_name));
+        println!("chip_path: {:?}", chip_path);
+        let chip = fs::read(chip_path).unwrap();
+        let chip: Chip = serde_yaml::from_slice(&chip).unwrap();
+
+        let mut ir = ir::IR::new();
+
+        let mut dev = ir::Device {
+            interrupts: Vec::new(),
+            peripherals: Vec::new(),
+        };
+
+        // Load RCC register for chip
+        let rcc = chip.peripherals.iter().find_map(|(name, p)| {
+            if name == "RCC" {
+                p.block.as_ref().map(|block| {
+                    let bi = BlockInfo::parse(block);
+                    let rcc_reg_path = data_dir
+                        .join("registers")
+                        .join(&format!("{}_{}.yaml", bi.module, bi.version));
+                    serde_yaml::from_reader(File::open(rcc_reg_path).unwrap()).unwrap()
+                })
+            } else {
+                None
+            }
+        });
+
+        let mut peripheral_versions: HashMap<String, String> = HashMap::new();
+        let mut pin_table: Vec<Vec<String>> = Vec::new();
+        let mut interrupt_table: Vec<Vec<String>> = Vec::new();
+        let mut peripherals_table: Vec<Vec<String>> = Vec::new();
+        let mut peripheral_pins_table: Vec<Vec<String>> = Vec::new();
+        let mut peripheral_rcc_table: Vec<Vec<String>> = Vec::new();
+
+        let dma_base = chip
+            .peripherals
+            .get(&"DMA".to_string())
+            .unwrap_or_else(|| chip.peripherals.get(&"DMA1".to_string()).unwrap())
+            .address;
+        let dma_stride = 0x400;
+
+        let gpio_base = chip.peripherals.get(&"GPIOA".to_string()).unwrap().address;
+        let gpio_stride = 0x400;
+
+        for (name, p) in &chip.peripherals {
+            let mut ir_peri = ir::Peripheral {
+                name: name.clone(),
+                array: None,
+                base_address: p.address,
+                block: None,
+                description: None,
+                interrupts: HashMap::new(),
+            };
+
+            if let Some(block) = &p.block {
+                let bi = BlockInfo::parse(block);
+
+                for pin in &p.pins {
+                    let mut row = Vec::new();
+                    row.push(name.clone());
+                    row.push(bi.module.clone());
+                    row.push(bi.block.clone());
+                    row.push(pin.pin.clone());
+                    row.push(pin.signal.clone());
+                    if let Some(ref af) = pin.af {
+                        row.push(af.clone());
+                    }
+                    peripheral_pins_table.push(row);
+                }
+
+                let mut peripheral_row = Vec::new();
+                peripheral_row.push(bi.module.clone());
+                peripheral_row.push(name.clone());
+                peripherals_table.push(peripheral_row);
+
+                if let Some(old_version) =
+                    peripheral_versions.insert(bi.module.clone(), bi.version.clone())
+                {
+                    if old_version != bi.version {
+                        panic!(
+                            "Peripheral {} has multiple versions: {} and {}",
+                            bi.module, old_version, bi.version
+                        );
+                    }
+                }
+                ir_peri.block = Some(format!("{}::{}", bi.module, bi.block));
+
+                match bi.module.as_str() {
+                    "gpio" => {
+                        let port_letter = name.chars().skip(4).next().unwrap();
+                        let port_num = port_letter as u32 - 'A' as u32;
+                        assert_eq!(p.address, gpio_base + gpio_stride * port_num);
+
+                        for pin_num in 0..16 {
+                            let pin_name = format!("P{}{}", port_letter, pin_num);
+                            pin_table.push(vec![
+                                pin_name.clone(),
+                                name.clone(),
+                                port_num.to_string(),
+                                pin_num.to_string(),
+                                format!("EXTI{}", pin_num),
+                            ]);
+                        }
+                    }
+                    "dma" => {
+                        let dma_num = if name == "DMA" {
+                            0
+                        } else {
+                            let dma_letter = name.chars().skip(3).next().unwrap();
+                            dma_letter as u32 - '1' as u32
+                        };
+                        assert_eq!(p.address, dma_base + dma_stride * dma_num);
+                    }
+                    _ => {}
+                }
+
+                if let Some(clock) = &p.clock {
+                    if let Some(rcc) = &rcc {
+                        // Workaround for clock registers being split on some chip families. Assume fields are
+                        // named after peripheral and look for first field matching and use that register.
+                        let en = find_reg_for_field(&rcc, clock, &format!("{}EN", name));
+                        let rst = find_reg_for_field(&rcc, clock, &format!("{}RST", name));
+
+                        match (en, rst) {
+                            (Some((enable_reg, enable_field)), Some((reset_reg, reset_field))) => {
+                                peripheral_rcc_table.push(vec![
+                                    name.clone(),
+                                    enable_reg.to_ascii_lowercase(),
+                                    reset_reg.to_ascii_lowercase(),
+                                    format!("set_{}", enable_field.to_ascii_lowercase()),
+                                    format!("set_{}", reset_field.to_ascii_lowercase()),
+                                ]);
+                            }
+                            (None, Some(_)) => {
+                                println!("Unable to find enable register for {}", name)
+                            }
+                            (Some(_), None) => {
+                                println!("Unable to find reset register for {}", name)
+                            }
+                            (None, None) => {
+                                println!("Unable to find enable and reset register for {}", name)
+                            }
+                        }
+                    }
+                }
+            }
+
+            dev.peripherals.push(ir_peri);
+        }
+
+        for (name, &num) in &chip.interrupts {
+            dev.interrupts.push(ir::Interrupt {
+                name: name.clone(),
+                description: None,
+                value: num,
+            });
+
+            interrupt_table.push(vec![name.to_ascii_uppercase()]);
+        }
+
+        ir.devices.insert("".to_string(), dev);
+
+        let mut extra = format!(
+            "pub fn GPIO(n: usize) -> gpio::Gpio {{
+            gpio::Gpio(({} + {}*n) as _)
+        }}
+        pub fn DMA(n: usize) -> dma::Dma {{
+            dma::Dma(({} + {}*n) as _)
+        }}",
+            gpio_base, gpio_stride, dma_base, dma_stride,
+        );
+
+        let peripheral_version_table = peripheral_versions
+            .iter()
+            .map(|(kind, version)| vec![kind.clone(), version.clone()])
+            .collect();
+
+        make_table(&mut extra, "pins", &pin_table);
+        make_table(&mut extra, "interrupts", &interrupt_table);
+        make_table(&mut extra, "peripherals", &peripherals_table);
+        make_table(&mut extra, "peripheral_versions", &peripheral_version_table);
+        make_table(&mut extra, "peripheral_pins", &peripheral_pins_table);
+        make_table(&mut extra, "peripheral_rcc", &peripheral_rcc_table);
+
+        for (module, version) in peripheral_versions {
+            all_peripheral_versions.insert((module.clone(), version.clone()));
+            write!(
+                &mut extra,
+                "#[path=\"../../peripherals/{}_{}.rs\"] pub mod {};\n",
+                module, version, module
+            )
+            .unwrap();
+        }
+
+        // Cleanups!
+        transform::sort::Sort {}.run(&mut ir).unwrap();
+        transform::Sanitize {}.run(&mut ir).unwrap();
+
+        let chip_dir = out_dir
+            .join("src/chips")
+            .join(chip_name.to_ascii_lowercase());
+        fs::create_dir_all(&chip_dir).unwrap();
+
+        let items = generate::render(&ir, &generate_opts).unwrap();
+        let mut file = File::create(chip_dir.join("pac.rs")).unwrap();
+        let data = items.to_string().replace("] ", "]\n");
+
+        // Remove inner attributes like #![no_std]
+        let re = Regex::new("# *! *\\[.*\\]").unwrap();
+        let data = re.replace_all(&data, "");
+        file.write_all(data.as_bytes()).unwrap();
+        file.write_all(extra.as_bytes()).unwrap();
+
+        let mut device_x = String::new();
+
+        for (name, _) in &chip.interrupts {
+            write!(
+                &mut device_x,
+                "PROVIDE({} = DefaultHandler);\n",
+                name.to_ascii_uppercase()
+            )
+            .unwrap();
+        }
+
+        File::create(chip_dir.join("device.x"))
+            .unwrap()
+            .write_all(device_x.as_bytes())
+            .unwrap();
+    }
+
+    for (module, version) in all_peripheral_versions {
+        println!("loading {} {}", module, version);
+
+        let regs_path = Path::new(&data_dir)
+            .join("registers")
+            .join(&format!("{}_{}.yaml", module, version));
+
+        let mut ir: ir::IR = serde_yaml::from_reader(File::open(regs_path).unwrap()).unwrap();
+
+        transform::expand_extends::ExpandExtends {}
+            .run(&mut ir)
+            .unwrap();
+
+        transform::map_names(&mut ir, |s, k| match k {
+            transform::NameKind::Block => format!("{}", s),
+            transform::NameKind::Fieldset => format!("regs::{}", s),
+            transform::NameKind::Enum => format!("vals::{}", s),
+            _ => s.to_string(),
+        })
+        .unwrap();
+
+        transform::sort::Sort {}.run(&mut ir).unwrap();
+        transform::Sanitize {}.run(&mut ir).unwrap();
+
+        let items = generate::render(&ir, &generate_opts).unwrap();
+        let mut file = File::create(
+            out_dir
+                .join("src/peripherals")
+                .join(format!("{}_{}.rs", module, version)),
+        )
+        .unwrap();
+        let data = items.to_string().replace("] ", "]\n");
+
+        // Remove inner attributes like #![no_std]
+        let re = Regex::new("# *! *\\[.*\\]").unwrap();
+        let data = re.replace_all(&data, "");
+        file.write_all(data.as_bytes()).unwrap();
+    }
+
+    // Generate src/lib_inner.rs
+    const PATHS_MARKER: &[u8] = b"// GEN PATHS HERE";
+    let librs = include_bytes!("assets/lib_inner.rs");
+    let i = bytes_find(librs, PATHS_MARKER).unwrap();
+    let mut paths = String::new();
+    for chip_name in &options.chips {
+        let x = chip_name.to_ascii_lowercase();
+        write!(
+            &mut paths,
+            "#[cfg_attr(feature=\"{}\", path = \"chips/{}/pac.rs\")]",
+            x, x
+        )
+        .unwrap();
+    }
+    let mut contents: Vec<u8> = Vec::new();
+    contents.extend(&librs[..i]);
+    contents.extend(paths.as_bytes());
+    contents.extend(&librs[i + PATHS_MARKER.len()..]);
+    fs::write(out_dir.join("src").join("lib_inner.rs"), &contents).unwrap();
+
+    // Generate src/lib.rs
+    const CUT_MARKER: &[u8] = b"// GEN CUT HERE";
+    let librs = include_bytes!("../../src/lib.rs");
+    let i = bytes_find(librs, CUT_MARKER).unwrap();
+    let mut contents: Vec<u8> = Vec::new();
+    contents.extend(&librs[..i]);
+    contents.extend(b"include!(\"lib_inner.rs\");\n");
+    fs::write(out_dir.join("src").join("lib.rs"), contents).unwrap();
+
+    // Generate src/common.rs
+    fs::write(
+        out_dir.join("src").join("common.rs"),
+        generate::COMMON_MODULE,
+    )
+    .unwrap();
+
+    // Generate Cargo.toml
+    const BUILDDEP_BEGIN: &[u8] = b"# BEGIN BUILD DEPENDENCIES";
+    const BUILDDEP_END: &[u8] = b"# END BUILD DEPENDENCIES";
+
+    let mut contents = include_bytes!("../../Cargo.toml").to_vec();
+    let begin = bytes_find(&contents, BUILDDEP_BEGIN).unwrap();
+    let end = bytes_find(&contents, BUILDDEP_END).unwrap() + BUILDDEP_END.len();
+    contents.drain(begin..end);
+    fs::write(out_dir.join("Cargo.toml"), contents).unwrap();
+
+    // Generate build.rs
+    fs::write(out_dir.join("build.rs"), include_bytes!("assets/build.rs")).unwrap();
+}
+
+fn bytes_find(haystack: &[u8], needle: &[u8]) -> Option<usize> {
+    haystack
+        .windows(needle.len())
+        .position(|window| window == needle)
+}
diff --git a/stm32-metapac/gen/src/main.rs b/stm32-metapac/gen/src/main.rs
new file mode 100644
index 000000000..bb76b9167
--- /dev/null
+++ b/stm32-metapac/gen/src/main.rs
@@ -0,0 +1,21 @@
+use std::path::PathBuf;
+use stm32_metapac_gen::*;
+
+fn main() {
+    let out_dir = PathBuf::from("out");
+    let data_dir = PathBuf::from("../../stm32-data/data");
+
+    let chips = std::fs::read_dir(data_dir.join("chips"))
+        .unwrap()
+        .filter_map(|res| res.unwrap().file_name().to_str().map(|s| s.to_string()))
+        .filter(|s| s.ends_with(".yaml"))
+        .filter(|s| !s.starts_with("STM32L1")) // cursed gpio stride
+        .map(|s| s.strip_suffix(".yaml").unwrap().to_string())
+        .collect();
+
+    gen(Options {
+        out_dir,
+        data_dir,
+        chips,
+    })
+}
diff --git a/stm32-metapac/src/lib.rs b/stm32-metapac/src/lib.rs
index cf8ff3789..5dd2682fb 100644
--- a/stm32-metapac/src/lib.rs
+++ b/stm32-metapac/src/lib.rs
@@ -3,4 +3,5 @@
 #![allow(unused)]
 #![allow(non_camel_case_types)]
 
-include!(concat!(env!("OUT_DIR"), "/pac.rs"));
+// GEN CUT HERE
+include!(concat!(env!("OUT_DIR"), "/src/lib_inner.rs"));