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50 lines
1.3 KiB
Rust
50 lines
1.3 KiB
Rust
//! USB peripheral
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//!
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//! Requires the `stm32-usbd` feature.
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//!
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//! See <https://github.com/stm32-rs/stm32f0xx-hal/tree/master/examples>
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//! for usage examples.
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use crate::stm32::{RCC, USB};
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use stm32_usbd::UsbPeripheral;
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use crate::gpio::gpioa::{PA11, PA12};
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use crate::gpio::{Floating, Input};
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pub use stm32_usbd::UsbBus;
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pub struct Peripheral {
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pub usb: USB,
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pub pin_dm: PA11<Input<Floating>>,
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pub pin_dp: PA12<Input<Floating>>,
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}
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unsafe impl Sync for Peripheral {}
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unsafe impl UsbPeripheral for Peripheral {
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const REGISTERS: *const () = USB::ptr() as *const ();
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const DP_PULL_UP_FEATURE: bool = true;
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const EP_MEMORY: *const () = 0x4000_6000 as _;
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const EP_MEMORY_SIZE: usize = 1024;
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fn enable() {
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let rcc = unsafe { (&*RCC::ptr()) };
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cortex_m::interrupt::free(|_| {
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// Enable USB peripheral
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rcc.apb1enr.modify(|_, w| w.usben().set_bit());
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// Reset USB peripheral
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rcc.apb1rstr.modify(|_, w| w.usbrst().set_bit());
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rcc.apb1rstr.modify(|_, w| w.usbrst().clear_bit());
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});
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}
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fn startup_delay() {
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// There is a chip specific startup delay. For STM32F103xx it's 1µs and this should wait for
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// at least that long.
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cortex_m::asm::delay(72);
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}
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}
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pub type UsbBusType = UsbBus<Peripheral>;
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