embassy/embassy-stm32/gen.py

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import xmltodict
import yaml
import re
import json
import os
import re
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import toml
from collections import OrderedDict
from glob import glob
abspath = os.path.abspath(__file__)
dname = os.path.dirname(abspath)
os.chdir(dname)
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# ======= load chips
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chips = {}
for f in sorted(glob('stm32-data/data/chips/*.yaml')):
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if 'STM32F4' not in f and 'STM32L4' not in f and 'STM32H7' not in f and 'STM32L0' not in f:
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continue
with open(f, 'r') as f:
chip = yaml.load(f, Loader=yaml.CSafeLoader)
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chip['name'] = chip['name'].lower()
chip['features'] = set()
family = chip["family"].lower().replace('+', 'p')
chip['features'].add(f'_{family}')
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print(chip['name'])
chips[chip['name']] = chip
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# ======= load GPIO AF
gpio_afs = {}
for f in sorted(glob('stm32-data/data/gpio_af/*.yaml')):
name = f.split('/')[-1].split('.')[0]
with open(f, 'r') as f:
af = yaml.load(f, Loader=yaml.CSafeLoader)
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gpio_afs[name] = af
# ========= Generate pac/mod.rs
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with open('src/pac/mod.rs', 'w') as f:
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for chip in chips.values():
f.write(
f'#[cfg_attr(feature="{chip["name"]}", path="{chip["name"]}.rs")]\n')
f.write('mod chip;\n')
f.write('pub use chip::*;\n')
# ========= Generate pac/stm32xxx.rs
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for chip in chips.values():
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print(f'generating {chip["name"]}')
with open(f'src/pac/{chip["name"]}.rs', 'w') as f:
f.write("""
#![allow(dead_code)]
#![allow(unused_imports)]
#![allow(non_snake_case)]
""")
af = gpio_afs[chip['gpio_af']]
peripheral_names = [] # USART1, PA5, EXTI8
exti_interrupts = [] # EXTI IRQs, EXTI0, EXTI4_15 etc.
peripheral_versions = {} # usart -> v1, syscfg -> f4
pins = set() # set of all present pins. PA4, PA5...
# TODO this should probably come from the yamls?
# We don't want to hardcode the EXTI peripheral addr
gpio_base = chip['peripherals']['GPIOA']['address']
gpio_stride = 0x400
f.write(f"""
pub fn GPIO(n: usize) -> gpio::Gpio {{
gpio::Gpio((0x{gpio_base:x} + 0x{gpio_stride:x}*n) as _)
}}
""")
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# ========= peripherals
peripheral_names.extend((f'EXTI{x}' for x in range(16)))
num_dmas = 0
for (name, peri) in chip['peripherals'].items():
if 'block' not in peri:
continue
block = peri['block']
block_mod, block_name = block.rsplit('/')
block_mod, block_version = block_mod.rsplit('_')
block_name = block_name.capitalize()
# Check all peripherals have the same version: it's not OK for the same chip to use both usart_v1 and usart_v2
if old_version := peripheral_versions.get(block_mod):
if old_version != block_version:
raise Exception(f'Peripheral {block_mod} has two versions: {old_version} and {block_version}')
peripheral_versions[block_mod] = block_version
# Set features
chip['features'].add(f'_{block_mod}')
chip['features'].add(f'_{block_mod}_{block_version}')
f.write(f'pub const {name}: {block_mod}::{block_name} = {block_mod}::{block_name}(0x{peri["address"]:x} as _);')
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custom_singletons = False
if block_mod == 'usart':
f.write(f'impl_usart!({name});')
for pin, funcs in af.items():
if pin in pins:
if func := funcs.get(f'{name}_RX'):
f.write(f'impl_usart_pin!({name}, RxPin, {pin}, {func});')
if func := funcs.get(f'{name}_TX'):
f.write(f'impl_usart_pin!({name}, TxPin, {pin}, {func});')
if func := funcs.get(f'{name}_CTS'):
f.write(f'impl_usart_pin!({name}, CtsPin, {pin}, {func});')
if func := funcs.get(f'{name}_RTS'):
f.write(f'impl_usart_pin!({name}, RtsPin, {pin}, {func});')
if func := funcs.get(f'{name}_CK'):
f.write(f'impl_usart_pin!({name}, CkPin, {pin}, {func});')
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if block_mod == 'rng':
for irq in chip['interrupts']:
if re.search('RNG', irq):
f.write(f'impl_rng!({name}, ' + irq + f');')
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if block_mod == 'spi':
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if 'clock' in peri:
clock = peri['clock']
f.write(f'impl_spi!({name}, {clock});')
for pin, funcs in af.items():
if pin in pins:
if func := funcs.get(f'{name}_SCK'):
f.write(f'impl_spi_pin!({name}, SckPin, {pin}, {func});')
if func := funcs.get(f'{name}_MOSI'):
f.write(f'impl_spi_pin!({name}, MosiPin, {pin}, {func});')
if func := funcs.get(f'{name}_MISO'):
f.write(f'impl_spi_pin!({name}, MisoPin, {pin}, {func});')
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if block_mod == 'gpio':
custom_singletons = True
port = name[4:]
port_num = ord(port) - ord('A')
assert peri['address'] == gpio_base + gpio_stride*port_num
for pin_num in range(16):
pin = f'P{port}{pin_num}'
pins.add(pin)
peripheral_names.append(pin)
f.write(f'impl_gpio_pin!({pin}, {port_num}, {pin_num}, EXTI{pin_num});')
if block_mod == 'dma':
custom_singletons = True
num_dmas += 1
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dma_num = int(name[3:])-1 # substract 1 because we want DMA1=0, DMA2=1
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for ch_num in range(8):
channel = f'{name}_CH{ch_num}'
peripheral_names.append(channel)
f.write(f'impl_dma_channel!({channel}, {dma_num}, {ch_num});')
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if peri['block'] == 'sdmmc_v2/SDMMC':
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f.write(f'impl_sdmmc!({name});')
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for pin, funcs in af.items():
if pin in pins:
if func := funcs.get(f'{name}_CK'):
f.write(f'impl_sdmmc_pin!({name}, CkPin, {pin}, {func});')
if func := funcs.get(f'{name}_CMD'):
f.write(f'impl_sdmmc_pin!({name}, CmdPin, {pin}, {func});')
if func := funcs.get(f'{name}_D0'):
f.write(f'impl_sdmmc_pin!({name}, D0Pin, {pin}, {func});')
if func := funcs.get(f'{name}_D1'):
f.write(f'impl_sdmmc_pin!({name}, D1Pin, {pin}, {func});')
if func := funcs.get(f'{name}_D2'):
f.write(f'impl_sdmmc_pin!({name}, D2Pin, {pin}, {func});')
if func := funcs.get(f'{name}_D3'):
f.write(f'impl_sdmmc_pin!({name}, D3Pin, {pin}, {func});')
if func := funcs.get(f'{name}_D4'):
f.write(f'impl_sdmmc_pin!({name}, D4Pin, {pin}, {func});')
if func := funcs.get(f'{name}_D5'):
f.write(f'impl_sdmmc_pin!({name}, D5Pin, {pin}, {func});')
if func := funcs.get(f'{name}_D6'):
f.write(f'impl_sdmmc_pin!({name}, D6Pin, {pin}, {func});')
if func := funcs.get(f'{name}_D7'):
f.write(f'impl_sdmmc_pin!({name}, D7Pin, {pin}, {func});')
if block_mod == 'exti':
for irq in chip['interrupts']:
if re.match('EXTI', irq):
exti_interrupts.append(irq)
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if not custom_singletons:
peripheral_names.append(name)
for mod, version in peripheral_versions.items():
f.write(f'pub use regs::{mod}_{version} as {mod};')
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f.write(f"""
mod regs;
pub use regs::generic;
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use embassy_extras::peripherals;
peripherals!({','.join(peripheral_names)});
""")
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# ========= DMA peripherals
if num_dmas > 0:
f.write(f"""
pub fn DMA(n: u8) -> dma::Dma {{
match n {{
""")
for n in range(num_dmas - 1):
f.write(f'{n} => DMA{n + 1},')
f.write(f"""
_ => DMA{num_dmas},
}}
}}
""")
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# ========= exti interrupts
f.write(f"""
use embassy::interrupt::Interrupt;
use embassy::interrupt::InterruptExt;
impl_exti_irq!({','.join(exti_interrupts)});
""")
# ========= interrupts
irq_variants = []
irq_vectors = []
irq_fns = []
irq_declares = []
irqs = {num: name for name, num in chip['interrupts'].items()}
irq_count = max(irqs.keys()) + 1
for num, name in irqs.items():
irq_variants.append(f'{name} = {num},')
irq_fns.append(f'fn {name}();')
irq_declares.append(f'declare!({name});')
for num in range(irq_count):
if name := irqs.get(num):
irq_vectors.append(f'Vector {{ _handler: {name} }},')
else:
irq_vectors.append(f'Vector {{ _reserved: 0 }},')
f.write(f"""
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pub mod interrupt {{
pub use cortex_m::interrupt::{{CriticalSection, Mutex}};
pub use embassy::interrupt::{{declare, take, Interrupt}};
pub use embassy_extras::interrupt::Priority4 as Priority;
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
#[allow(non_camel_case_types)]
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pub enum InterruptEnum {{
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{''.join(irq_variants)}
}}
unsafe impl cortex_m::interrupt::InterruptNumber for InterruptEnum {{
#[inline(always)]
fn number(self) -> u16 {{
self as u16
}}
}}
{''.join(irq_declares)}
}}
mod interrupt_vector {{
extern "C" {{
{''.join(irq_fns)}
}}
pub union Vector {{
_handler: unsafe extern "C" fn(),
_reserved: u32,
}}
#[link_section = ".vector_table.interrupts"]
#[no_mangle]
pub static __INTERRUPTS: [Vector; {irq_count}] = [
{''.join(irq_vectors)}
];
}}
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""")
# ========= Update Cargo features
feature_optional_deps = {}
feature_optional_deps['_rng'] = ['rand_core']
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feature_optional_deps['_sdmmc'] = ['sdio-host']
features = {}
extra_features = set()
for name, chip in chips.items():
features[name] = sorted(list(chip['features']))
for feature in chip['features']:
extra_features.add(feature)
for feature in sorted(list(extra_features)):
features[feature] = feature_optional_deps.get(feature) or []
SEPARATOR_START = '# BEGIN GENERATED FEATURES\n'
SEPARATOR_END = '# END GENERATED FEATURES\n'
with open('Cargo.toml', 'r') as f:
cargo = f.read()
before, cargo = cargo.split(SEPARATOR_START, maxsplit=1)
_, after = cargo.split(SEPARATOR_END, maxsplit=1)
cargo = before + SEPARATOR_START + toml.dumps(features) + SEPARATOR_END + after
with open('Cargo.toml', 'w') as f:
f.write(cargo)
# ========= Generate pac/regs.rs
os.system('cargo run --manifest-path ../../svd2rust/Cargo.toml -- generate --dir stm32-data/data/registers')
os.system('mv lib.rs src/pac/regs.rs')
# ========= Update Cargo features
os.system('rustfmt src/pac/*')