From 4999b045df4e5956733b0341795714a9214c12d3 Mon Sep 17 00:00:00 2001 From: Dario Nieuwenhuis Date: Mon, 31 Jul 2023 01:41:12 +0200 Subject: [PATCH] stm32/rng: use bind_interrupts!. --- embassy-stm32/Cargo.toml | 4 +- embassy-stm32/src/rng.rs | 86 ++++++++++-------------- examples/stm32f4/src/bin/eth.rs | 6 +- examples/stm32f4/src/bin/usb_ethernet.rs | 5 +- examples/stm32f7/src/bin/eth.rs | 6 +- examples/stm32h5/src/bin/eth.rs | 6 +- examples/stm32h5/src/bin/rng.rs | 7 +- examples/stm32h7/src/bin/eth.rs | 6 +- examples/stm32h7/src/bin/eth_client.rs | 6 +- examples/stm32h7/src/bin/rng.rs | 7 +- examples/stm32l0/src/bin/lora_lorawan.rs | 8 ++- examples/stm32l4/src/bin/rng.rs | 8 ++- examples/stm32l5/src/bin/rng.rs | 8 ++- examples/stm32l5/src/bin/usb_ethernet.rs | 5 +- examples/stm32wl/src/bin/lora_lorawan.rs | 7 +- examples/stm32wl/src/bin/random.rs | 10 ++- 16 files changed, 103 insertions(+), 82 deletions(-) diff --git a/embassy-stm32/Cargo.toml b/embassy-stm32/Cargo.toml index ba279f79..a1323e85 100644 --- a/embassy-stm32/Cargo.toml +++ b/embassy-stm32/Cargo.toml @@ -57,7 +57,7 @@ sdio-host = "0.5.0" embedded-sdmmc = { git = "https://github.com/embassy-rs/embedded-sdmmc-rs", rev = "a4f293d3a6f72158385f79c98634cb8a14d0d2fc", optional = true } critical-section = "1.1" atomic-polyfill = "1.0.1" -stm32-metapac = "13" +stm32-metapac = { git = "https://github.com/embassy-rs/stm32-data-generated", tag = "stm32-data-1f8ab493e029fc601edebc6bac105a63cc9858fe" } vcell = "0.1.3" bxcan = "0.7.0" nb = "1.0.0" @@ -75,7 +75,7 @@ critical-section = { version = "1.1", features = ["std"] } [build-dependencies] proc-macro2 = "1.0.36" quote = "1.0.15" -stm32-metapac = { version = "13", default-features = false, features = ["metadata"]} +stm32-metapac = { git = "https://github.com/embassy-rs/stm32-data-generated", tag = "stm32-data-1f8ab493e029fc601edebc6bac105a63cc9858fe", default-features = false, features = ["metadata"]} [features] default = ["rt"] diff --git a/embassy-stm32/src/rng.rs b/embassy-stm32/src/rng.rs index c4b77d01..2a4978ec 100644 --- a/embassy-stm32/src/rng.rs +++ b/embassy-stm32/src/rng.rs @@ -1,16 +1,17 @@ #![macro_use] use core::future::poll_fn; +use core::marker::PhantomData; use core::task::Poll; -use embassy_hal_internal::interrupt::InterruptExt; use embassy_hal_internal::{into_ref, PeripheralRef}; use embassy_sync::waitqueue::AtomicWaker; use rand_core::{CryptoRng, RngCore}; +use crate::interrupt::typelevel::Interrupt; use crate::{interrupt, pac, peripherals, Peripheral}; -pub(crate) static RNG_WAKER: AtomicWaker = AtomicWaker::new(); +static RNG_WAKER: AtomicWaker = AtomicWaker::new(); #[cfg_attr(feature = "defmt", derive(defmt::Format))] pub enum Error { @@ -18,20 +19,38 @@ pub enum Error { ClockError, } +pub struct InterruptHandler { + _phantom: PhantomData, +} + +impl interrupt::typelevel::Handler for InterruptHandler { + unsafe fn on_interrupt() { + let bits = T::regs().sr().read(); + if bits.drdy() || bits.seis() || bits.ceis() { + T::regs().cr().modify(|reg| reg.set_ie(false)); + RNG_WAKER.wake(); + } + } +} + pub struct Rng<'d, T: Instance> { _inner: PeripheralRef<'d, T>, } impl<'d, T: Instance> Rng<'d, T> { - pub fn new(inner: impl Peripheral

+ 'd) -> Self { + pub fn new( + inner: impl Peripheral

+ 'd, + _irq: impl interrupt::typelevel::Binding> + 'd, + ) -> Self { T::enable(); T::reset(); into_ref!(inner); let mut random = Self { _inner: inner }; random.reset(); - unsafe { - interrupt::RNG.enable(); - } + + T::Interrupt::unpend(); + unsafe { T::Interrupt::enable() }; + random } @@ -189,57 +208,20 @@ pub(crate) mod sealed { } } -pub trait Instance: sealed::Instance + crate::rcc::RccPeripheral {} +pub trait Instance: sealed::Instance + Peripheral

+ crate::rcc::RccPeripheral + 'static + Send { + type Interrupt: interrupt::typelevel::Interrupt; +} -foreach_peripheral!( - (rng, $inst:ident) => { - impl Instance for peripherals::$inst {} +foreach_interrupt!( + ($inst:ident, rng, RNG, GLOBAL, $irq:ident) => { + impl Instance for peripherals::$inst { + type Interrupt = crate::interrupt::typelevel::$irq; + } impl sealed::Instance for peripherals::$inst { fn regs() -> crate::pac::rng::Rng { - crate::pac::RNG + crate::pac::$inst } } }; ); - -#[cfg(feature = "rt")] -macro_rules! irq { - ($irq:ident) => { - mod rng_irq { - use crate::interrupt; - - #[interrupt] - unsafe fn $irq() { - let bits = $crate::pac::RNG.sr().read(); - if bits.drdy() || bits.seis() || bits.ceis() { - $crate::pac::RNG.cr().modify(|reg| reg.set_ie(false)); - $crate::rng::RNG_WAKER.wake(); - } - } - } - }; -} - -#[cfg(feature = "rt")] -foreach_interrupt!( - (RNG) => { - irq!(RNG); - }; - - (RNG_LPUART1) => { - irq!(RNG_LPUART1); - }; - - (AES_RNG_LPUART1) => { - irq!(AES_RNG_LPUART1); - }; - - (AES_RNG) => { - irq!(AES_RNG); - }; - - (HASH_RNG) => { - irq!(HASH_RNG); - }; -); diff --git a/examples/stm32f4/src/bin/eth.rs b/examples/stm32f4/src/bin/eth.rs index d0b16439..49601668 100644 --- a/examples/stm32f4/src/bin/eth.rs +++ b/examples/stm32f4/src/bin/eth.rs @@ -11,13 +11,15 @@ use embassy_stm32::eth::{Ethernet, PacketQueue}; use embassy_stm32::peripherals::ETH; use embassy_stm32::rng::Rng; use embassy_stm32::time::mhz; -use embassy_stm32::{bind_interrupts, eth, Config}; +use embassy_stm32::{bind_interrupts, eth, peripherals, rng, Config}; use embassy_time::{Duration, Timer}; use embedded_io::asynch::Write; use static_cell::make_static; use {defmt_rtt as _, panic_probe as _}; + bind_interrupts!(struct Irqs { ETH => eth::InterruptHandler; + HASH_RNG => rng::InterruptHandler; }); type Device = Ethernet<'static, ETH, GenericSMI>; @@ -36,7 +38,7 @@ async fn main(spawner: Spawner) -> ! { info!("Hello World!"); // Generate random seed. - let mut rng = Rng::new(p.RNG); + let mut rng = Rng::new(p.RNG, Irqs); let mut seed = [0; 8]; let _ = rng.async_fill_bytes(&mut seed).await; let seed = u64::from_le_bytes(seed); diff --git a/examples/stm32f4/src/bin/usb_ethernet.rs b/examples/stm32f4/src/bin/usb_ethernet.rs index b1f01417..740d3018 100644 --- a/examples/stm32f4/src/bin/usb_ethernet.rs +++ b/examples/stm32f4/src/bin/usb_ethernet.rs @@ -6,7 +6,7 @@ use defmt::*; use embassy_executor::Spawner; use embassy_net::tcp::TcpSocket; use embassy_net::{Stack, StackResources}; -use embassy_stm32::rng::Rng; +use embassy_stm32::rng::{self, Rng}; use embassy_stm32::time::mhz; use embassy_stm32::usb_otg::Driver; use embassy_stm32::{bind_interrupts, peripherals, usb_otg, Config}; @@ -38,6 +38,7 @@ async fn net_task(stack: &'static Stack>) -> ! { bind_interrupts!(struct Irqs { OTG_FS => usb_otg::InterruptHandler; + HASH_RNG => rng::InterruptHandler; }); #[embassy_executor::main] @@ -104,7 +105,7 @@ async fn main(spawner: Spawner) { //}); // Generate random seed - let mut rng = Rng::new(p.RNG); + let mut rng = Rng::new(p.RNG, Irqs); let mut seed = [0; 8]; unwrap!(rng.async_fill_bytes(&mut seed).await); let seed = u64::from_le_bytes(seed); diff --git a/examples/stm32f7/src/bin/eth.rs b/examples/stm32f7/src/bin/eth.rs index c6b2ba45..e5abf52b 100644 --- a/examples/stm32f7/src/bin/eth.rs +++ b/examples/stm32f7/src/bin/eth.rs @@ -11,14 +11,16 @@ use embassy_stm32::eth::{Ethernet, PacketQueue}; use embassy_stm32::peripherals::ETH; use embassy_stm32::rng::Rng; use embassy_stm32::time::mhz; -use embassy_stm32::{bind_interrupts, eth, Config}; +use embassy_stm32::{bind_interrupts, eth, peripherals, rng, Config}; use embassy_time::{Duration, Timer}; use embedded_io::asynch::Write; use rand_core::RngCore; use static_cell::make_static; use {defmt_rtt as _, panic_probe as _}; + bind_interrupts!(struct Irqs { ETH => eth::InterruptHandler; + RNG => rng::InterruptHandler; }); type Device = Ethernet<'static, ETH, GenericSMI>; @@ -37,7 +39,7 @@ async fn main(spawner: Spawner) -> ! { info!("Hello World!"); // Generate random seed. - let mut rng = Rng::new(p.RNG); + let mut rng = Rng::new(p.RNG, Irqs); let mut seed = [0; 8]; rng.fill_bytes(&mut seed); let seed = u64::from_le_bytes(seed); diff --git a/examples/stm32h5/src/bin/eth.rs b/examples/stm32h5/src/bin/eth.rs index 0bff85ed..2aa2ab62 100644 --- a/examples/stm32h5/src/bin/eth.rs +++ b/examples/stm32h5/src/bin/eth.rs @@ -12,14 +12,16 @@ use embassy_stm32::peripherals::ETH; use embassy_stm32::rcc::{AHBPrescaler, APBPrescaler, Hse, HseMode, Pll, PllSource, Sysclk, VoltageScale}; use embassy_stm32::rng::Rng; use embassy_stm32::time::Hertz; -use embassy_stm32::{bind_interrupts, eth, Config}; +use embassy_stm32::{bind_interrupts, eth, peripherals, rng, Config}; use embassy_time::{Duration, Timer}; use embedded_io::asynch::Write; use rand_core::RngCore; use static_cell::make_static; use {defmt_rtt as _, panic_probe as _}; + bind_interrupts!(struct Irqs { ETH => eth::InterruptHandler; + RNG => rng::InterruptHandler; }); type Device = Ethernet<'static, ETH, GenericSMI>; @@ -56,7 +58,7 @@ async fn main(spawner: Spawner) -> ! { info!("Hello World!"); // Generate random seed. - let mut rng = Rng::new(p.RNG); + let mut rng = Rng::new(p.RNG, Irqs); let mut seed = [0; 8]; rng.fill_bytes(&mut seed); let seed = u64::from_le_bytes(seed); diff --git a/examples/stm32h5/src/bin/rng.rs b/examples/stm32h5/src/bin/rng.rs index af9be0b6..7c8c50ec 100644 --- a/examples/stm32h5/src/bin/rng.rs +++ b/examples/stm32h5/src/bin/rng.rs @@ -5,14 +5,19 @@ use defmt::*; use embassy_executor::Spawner; use embassy_stm32::rng::Rng; +use embassy_stm32::{bind_interrupts, peripherals, rng}; use {defmt_rtt as _, panic_probe as _}; +bind_interrupts!(struct Irqs { + RNG => rng::InterruptHandler; +}); + #[embassy_executor::main] async fn main(_spawner: Spawner) { let p = embassy_stm32::init(Default::default()); info!("Hello World!"); - let mut rng = Rng::new(p.RNG); + let mut rng = Rng::new(p.RNG, Irqs); let mut buf = [0u8; 16]; unwrap!(rng.async_fill_bytes(&mut buf).await); diff --git a/examples/stm32h7/src/bin/eth.rs b/examples/stm32h7/src/bin/eth.rs index cfafcaed..c93be9f0 100644 --- a/examples/stm32h7/src/bin/eth.rs +++ b/examples/stm32h7/src/bin/eth.rs @@ -11,14 +11,16 @@ use embassy_stm32::eth::{Ethernet, PacketQueue}; use embassy_stm32::peripherals::ETH; use embassy_stm32::rng::Rng; use embassy_stm32::time::mhz; -use embassy_stm32::{bind_interrupts, eth, Config}; +use embassy_stm32::{bind_interrupts, eth, peripherals, rng, Config}; use embassy_time::{Duration, Timer}; use embedded_io::asynch::Write; use rand_core::RngCore; use static_cell::make_static; use {defmt_rtt as _, panic_probe as _}; + bind_interrupts!(struct Irqs { ETH => eth::InterruptHandler; + RNG => rng::InterruptHandler; }); type Device = Ethernet<'static, ETH, GenericSMI>; @@ -38,7 +40,7 @@ async fn main(spawner: Spawner) -> ! { info!("Hello World!"); // Generate random seed. - let mut rng = Rng::new(p.RNG); + let mut rng = Rng::new(p.RNG, Irqs); let mut seed = [0; 8]; rng.fill_bytes(&mut seed); let seed = u64::from_le_bytes(seed); diff --git a/examples/stm32h7/src/bin/eth_client.rs b/examples/stm32h7/src/bin/eth_client.rs index 4ed73757..78005e91 100644 --- a/examples/stm32h7/src/bin/eth_client.rs +++ b/examples/stm32h7/src/bin/eth_client.rs @@ -11,15 +11,17 @@ use embassy_stm32::eth::{Ethernet, PacketQueue}; use embassy_stm32::peripherals::ETH; use embassy_stm32::rng::Rng; use embassy_stm32::time::mhz; -use embassy_stm32::{bind_interrupts, eth, Config}; +use embassy_stm32::{bind_interrupts, eth, peripherals, rng, Config}; use embassy_time::{Duration, Timer}; use embedded_io::asynch::Write; use embedded_nal_async::{Ipv4Addr, SocketAddr, SocketAddrV4, TcpConnect}; use rand_core::RngCore; use static_cell::make_static; use {defmt_rtt as _, panic_probe as _}; + bind_interrupts!(struct Irqs { ETH => eth::InterruptHandler; + RNG => rng::InterruptHandler; }); type Device = Ethernet<'static, ETH, GenericSMI>; @@ -39,7 +41,7 @@ async fn main(spawner: Spawner) -> ! { info!("Hello World!"); // Generate random seed. - let mut rng = Rng::new(p.RNG); + let mut rng = Rng::new(p.RNG, Irqs); let mut seed = [0; 8]; rng.fill_bytes(&mut seed); let seed = u64::from_le_bytes(seed); diff --git a/examples/stm32h7/src/bin/rng.rs b/examples/stm32h7/src/bin/rng.rs index af9be0b6..7c8c50ec 100644 --- a/examples/stm32h7/src/bin/rng.rs +++ b/examples/stm32h7/src/bin/rng.rs @@ -5,14 +5,19 @@ use defmt::*; use embassy_executor::Spawner; use embassy_stm32::rng::Rng; +use embassy_stm32::{bind_interrupts, peripherals, rng}; use {defmt_rtt as _, panic_probe as _}; +bind_interrupts!(struct Irqs { + RNG => rng::InterruptHandler; +}); + #[embassy_executor::main] async fn main(_spawner: Spawner) { let p = embassy_stm32::init(Default::default()); info!("Hello World!"); - let mut rng = Rng::new(p.RNG); + let mut rng = Rng::new(p.RNG, Irqs); let mut buf = [0u8; 16]; unwrap!(rng.async_fill_bytes(&mut buf).await); diff --git a/examples/stm32l0/src/bin/lora_lorawan.rs b/examples/stm32l0/src/bin/lora_lorawan.rs index c397edd5..03c793b3 100644 --- a/examples/stm32l0/src/bin/lora_lorawan.rs +++ b/examples/stm32l0/src/bin/lora_lorawan.rs @@ -12,8 +12,8 @@ use embassy_lora::LoraTimer; use embassy_stm32::exti::{Channel, ExtiInput}; use embassy_stm32::gpio::{Input, Level, Output, Pin, Pull, Speed}; use embassy_stm32::rng::Rng; -use embassy_stm32::spi; use embassy_stm32::time::khz; +use embassy_stm32::{bind_interrupts, peripherals, rng, spi}; use embassy_time::Delay; use lora_phy::mod_params::*; use lora_phy::sx1276_7_8_9::SX1276_7_8_9; @@ -23,6 +23,10 @@ use lorawan_device::async_device::lora_radio::LoRaRadio; use lorawan_device::async_device::{region, Device, JoinMode}; use {defmt_rtt as _, panic_probe as _}; +bind_interrupts!(struct Irqs { + RNG_LPUART1 => rng::InterruptHandler; +}); + const LORAWAN_REGION: region::Region = region::Region::EU868; // warning: set this appropriately for the region #[embassy_executor::main] @@ -66,7 +70,7 @@ async fn main(_spawner: Spawner) { let radio = LoRaRadio::new(lora); let region: region::Configuration = region::Configuration::new(LORAWAN_REGION); - let mut device: Device<_, Crypto, _, _> = Device::new(region, radio, LoraTimer::new(), Rng::new(p.RNG)); + let mut device: Device<_, Crypto, _, _> = Device::new(region, radio, LoraTimer::new(), Rng::new(p.RNG, Irqs)); defmt::info!("Joining LoRaWAN network"); diff --git a/examples/stm32l4/src/bin/rng.rs b/examples/stm32l4/src/bin/rng.rs index c9302bb9..806e49f5 100644 --- a/examples/stm32l4/src/bin/rng.rs +++ b/examples/stm32l4/src/bin/rng.rs @@ -6,9 +6,13 @@ use defmt::*; use embassy_executor::Spawner; use embassy_stm32::rcc::{ClockSrc, PLLClkDiv, PLLMul, PLLSource, PLLSrcDiv}; use embassy_stm32::rng::Rng; -use embassy_stm32::Config; +use embassy_stm32::{bind_interrupts, peripherals, rng, Config}; use {defmt_rtt as _, panic_probe as _}; +bind_interrupts!(struct Irqs { + RNG => rng::InterruptHandler; +}); + #[embassy_executor::main] async fn main(_spawner: Spawner) { let mut config = Config::default(); @@ -24,7 +28,7 @@ async fn main(_spawner: Spawner) { info!("Hello World!"); - let mut rng = Rng::new(p.RNG); + let mut rng = Rng::new(p.RNG, Irqs); let mut buf = [0u8; 16]; unwrap!(rng.async_fill_bytes(&mut buf).await); diff --git a/examples/stm32l5/src/bin/rng.rs b/examples/stm32l5/src/bin/rng.rs index d359847e..9549d64d 100644 --- a/examples/stm32l5/src/bin/rng.rs +++ b/examples/stm32l5/src/bin/rng.rs @@ -6,9 +6,13 @@ use defmt::*; use embassy_executor::Spawner; use embassy_stm32::rcc::{ClockSrc, PLLClkDiv, PLLMul, PLLSource, PLLSrcDiv}; use embassy_stm32::rng::Rng; -use embassy_stm32::Config; +use embassy_stm32::{bind_interrupts, peripherals, rng, Config}; use {defmt_rtt as _, panic_probe as _}; +bind_interrupts!(struct Irqs { + RNG => rng::InterruptHandler; +}); + #[embassy_executor::main] async fn main(_spawner: Spawner) { let mut config = Config::default(); @@ -23,7 +27,7 @@ async fn main(_spawner: Spawner) { info!("Hello World!"); - let mut rng = Rng::new(p.RNG); + let mut rng = Rng::new(p.RNG, Irqs); let mut buf = [0u8; 16]; unwrap!(rng.async_fill_bytes(&mut buf).await); diff --git a/examples/stm32l5/src/bin/usb_ethernet.rs b/examples/stm32l5/src/bin/usb_ethernet.rs index 32eba427..5e75b21c 100644 --- a/examples/stm32l5/src/bin/usb_ethernet.rs +++ b/examples/stm32l5/src/bin/usb_ethernet.rs @@ -9,7 +9,7 @@ use embassy_net::{Stack, StackResources}; use embassy_stm32::rcc::*; use embassy_stm32::rng::Rng; use embassy_stm32::usb::Driver; -use embassy_stm32::{bind_interrupts, peripherals, usb, Config}; +use embassy_stm32::{bind_interrupts, peripherals, rng, usb, Config}; use embassy_usb::class::cdc_ncm::embassy_net::{Device, Runner, State as NetState}; use embassy_usb::class::cdc_ncm::{CdcNcmClass, State}; use embassy_usb::{Builder, UsbDevice}; @@ -24,6 +24,7 @@ const MTU: usize = 1514; bind_interrupts!(struct Irqs { USB_FS => usb::InterruptHandler; + RNG => rng::InterruptHandler; }); #[embassy_executor::task] @@ -99,7 +100,7 @@ async fn main(spawner: Spawner) { //}); // Generate random seed - let mut rng = Rng::new(p.RNG); + let mut rng = Rng::new(p.RNG, Irqs); let seed = rng.next_u64(); // Init network stack diff --git a/examples/stm32wl/src/bin/lora_lorawan.rs b/examples/stm32wl/src/bin/lora_lorawan.rs index 805d2141..2c9c9886 100644 --- a/examples/stm32wl/src/bin/lora_lorawan.rs +++ b/examples/stm32wl/src/bin/lora_lorawan.rs @@ -10,9 +10,9 @@ use embassy_executor::Spawner; use embassy_lora::iv::{InterruptHandler, Stm32wlInterfaceVariant}; use embassy_lora::LoraTimer; use embassy_stm32::gpio::{Level, Output, Pin, Speed}; -use embassy_stm32::rng::Rng; +use embassy_stm32::rng::{self, Rng}; use embassy_stm32::spi::Spi; -use embassy_stm32::{bind_interrupts, pac}; +use embassy_stm32::{bind_interrupts, pac, peripherals}; use embassy_time::Delay; use lora_phy::mod_params::*; use lora_phy::sx1261_2::SX1261_2; @@ -26,6 +26,7 @@ const LORAWAN_REGION: region::Region = region::Region::EU868; // warning: set th bind_interrupts!(struct Irqs{ SUBGHZ_RADIO => InterruptHandler; + RNG => rng::InterruptHandler; }); #[embassy_executor::main] @@ -58,7 +59,7 @@ async fn main(_spawner: Spawner) { }; let radio = LoRaRadio::new(lora); let region: region::Configuration = region::Configuration::new(LORAWAN_REGION); - let mut device: Device<_, Crypto, _, _> = Device::new(region, radio, LoraTimer::new(), Rng::new(p.RNG)); + let mut device: Device<_, Crypto, _, _> = Device::new(region, radio, LoraTimer::new(), Rng::new(p.RNG, Irqs)); defmt::info!("Joining LoRaWAN network"); diff --git a/examples/stm32wl/src/bin/random.rs b/examples/stm32wl/src/bin/random.rs index d8562fca..592e65f4 100644 --- a/examples/stm32wl/src/bin/random.rs +++ b/examples/stm32wl/src/bin/random.rs @@ -4,10 +4,14 @@ use defmt::*; use embassy_executor::Spawner; -use embassy_stm32::pac; -use embassy_stm32::rng::Rng; +use embassy_stm32::rng::{self, Rng}; +use embassy_stm32::{bind_interrupts, pac, peripherals}; use {defmt_rtt as _, panic_probe as _}; +bind_interrupts!(struct Irqs{ + RNG => rng::InterruptHandler; +}); + #[embassy_executor::main] async fn main(_spawner: Spawner) { let mut config = embassy_stm32::Config::default(); @@ -21,7 +25,7 @@ async fn main(_spawner: Spawner) { info!("Hello World!"); - let mut rng = Rng::new(p.RNG); + let mut rng = Rng::new(p.RNG, Irqs); let mut buf = [0u8; 16]; unwrap!(rng.async_fill_bytes(&mut buf).await);