605 lines
22 KiB
Rust
605 lines
22 KiB
Rust
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#![no_std]
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#![no_main]
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extern crate panic_itm;
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use rtic::app;
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use heapless::{
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mpmc::Q16,
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pool,
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pool::singleton::{Box, Pool},
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};
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#[allow(unused_imports)]
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use itm_logger::{debug, info, logger_init, warn};
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use satrs_core::spacepackets::{ecss::PusPacket, tm::PusTm};
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use satrs_core::{
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pus::{EcssTmErrorWithSend, EcssTmSenderCore},
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seq_count::SequenceCountProviderCore,
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};
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use stm32f3xx_hal::dma::dma1;
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use stm32f3xx_hal::gpio::{PushPull, AF7, PA2, PA3};
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use stm32f3xx_hal::pac::USART2;
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use stm32f3xx_hal::serial::{Rx, RxEvent, Serial, SerialDmaRx, SerialDmaTx, Tx, TxEvent};
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use systick_monotonic::{fugit::Duration, Systick};
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const UART_BAUD: u32 = 115200;
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const BLINK_FREQ_MS: u64 = 1000;
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const TX_HANDLER_FREQ_MS: u64 = 20;
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const MIN_DELAY_BETWEEN_TX_PACKETS_MS: u16 = 5;
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const MAX_TC_LEN: usize = 200;
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const MAX_TM_LEN: usize = 200;
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pub const PUS_APID: u16 = 0x02;
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type TxType = Tx<USART2, PA2<AF7<PushPull>>>;
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type RxType = Rx<USART2, PA3<AF7<PushPull>>>;
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type MsDuration = Duration<u64, 1, 1000>;
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type TxDmaTransferType = SerialDmaTx<&'static [u8], dma1::C7, TxType>;
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type RxDmaTransferType = SerialDmaRx<&'static mut [u8], dma1::C6, RxType>;
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// This is the predictable maximum overhead of the COBS encoding scheme.
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// It is simply the maximum packet lenght dividied by 254 rounded up.
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const COBS_TC_OVERHEAD: usize = (MAX_TC_LEN + 254 - 1) / 254;
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const COBS_TM_OVERHEAD: usize = (MAX_TM_LEN + 254 - 1) / 254;
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const TC_BUF_LEN: usize = MAX_TC_LEN + COBS_TC_OVERHEAD;
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const TM_BUF_LEN: usize = MAX_TC_LEN + COBS_TM_OVERHEAD;
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// This is a static buffer which should ONLY (!) be used as the TX DMA
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// transfer buffer.
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static mut DMA_TX_BUF: [u8; TM_BUF_LEN] = [0; TM_BUF_LEN];
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// This is a static buffer which should ONLY (!) be used as the RX DMA
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// transfer buffer.
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static mut DMA_RX_BUF: [u8; TC_BUF_LEN] = [0; TC_BUF_LEN];
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static TX_REQUESTS: Q16<(Box<poolmod::TM>, usize)> = Q16::new();
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const TC_POOL_SLOTS: usize = 12;
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const TM_POOL_SLOTS: usize = 12;
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use core::sync::atomic::{AtomicU16, Ordering};
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pub struct SeqCountProviderAtomicRef {
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atomic: AtomicU16,
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ordering: Ordering,
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}
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impl SeqCountProviderAtomicRef {
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pub const fn new(ordering: Ordering) -> Self {
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Self {
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atomic: AtomicU16::new(0),
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ordering,
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}
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}
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}
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impl SequenceCountProviderCore<u16> for SeqCountProviderAtomicRef {
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fn get(&self) -> u16 {
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self.atomic.load(self.ordering)
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}
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fn increment(&self) {
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self.atomic.fetch_add(1, self.ordering);
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}
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fn get_and_increment(&self) -> u16 {
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self.atomic.fetch_add(1, self.ordering)
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}
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}
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static SEQ_COUNT_PROVIDER: SeqCountProviderAtomicRef =
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SeqCountProviderAtomicRef::new(Ordering::Relaxed);
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// Otherwise, warnings because of heapless pool macro.
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#[allow(non_camel_case_types)]
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mod poolmod {
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use super::*;
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// Must hold full TC length including COBS overhead.
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pool!(TC: [u8; TC_BUF_LEN]);
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// Only encoded at the end, so no need to account for COBS overhead.
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pool!(TM: [u8; MAX_TM_LEN]);
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}
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pub struct TxIdle {
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tx: TxType,
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dma_channel: dma1::C7,
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}
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#[derive(Debug)]
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pub enum TmStoreError {
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StoreFull,
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StoreSlotsTooSmall,
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}
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impl From<TmStoreError> for EcssTmErrorWithSend<TmStoreError> {
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fn from(value: TmStoreError) -> Self {
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Self::SendError(value)
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}
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}
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pub struct TmSender {
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mem_block: Option<Box<poolmod::TM>>,
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ctx: &'static str,
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}
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impl TmSender {
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pub fn new(mem_block: Box<poolmod::TM>, ctx: &'static str) -> Self {
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Self {
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mem_block: Some(mem_block),
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ctx,
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}
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}
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}
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impl EcssTmSenderCore for TmSender {
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type Error = TmStoreError;
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fn send_tm(
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&mut self,
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tm: PusTm,
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) -> Result<(), satrs_core::pus::EcssTmErrorWithSend<Self::Error>> {
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let mem_block = self.mem_block.take();
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if mem_block.is_none() {
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panic!("send_tm should only be called once");
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}
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let mut mem_block = mem_block.unwrap();
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if tm.len_packed() > MAX_TM_LEN {
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return Err(EcssTmErrorWithSend::SendError(
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TmStoreError::StoreSlotsTooSmall,
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));
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}
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tm.write_to_bytes(mem_block.as_mut_slice())
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.map_err(|e| EcssTmErrorWithSend::EcssTmError(e.into()))?;
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info!(target: self.ctx, "Sending TM[{},{}] with size {}", tm.service(), tm.subservice(), tm.len_packed());
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TX_REQUESTS
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.enqueue((mem_block, tm.len_packed()))
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.map_err(|_| TmStoreError::StoreFull)?;
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Ok(())
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}
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}
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pub enum UartTxState {
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// Wrapped in an option because we need an owned type later.
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Idle(Option<TxIdle>),
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// Same as above
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Transmitting(Option<TxDmaTransferType>),
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}
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#[app(device = stm32f3xx_hal::pac, peripherals = true, dispatchers = [TIM20_BRK, TIM20_UP, TIM20_TRG_COM])]
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mod app {
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use super::*;
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use core::slice::Iter;
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use cortex_m::iprintln;
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use satrs_core::pus::verification::FailParams;
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use satrs_core::pus::verification::VerificationReporterCore;
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use satrs_core::spacepackets::{
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ecss::EcssEnumU16,
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tc::PusTc,
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time::cds::P_FIELD_BASE,
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tm::{PusTm, PusTmSecondaryHeader},
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CcsdsPacket, SpHeader,
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};
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#[allow(unused_imports)]
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use stm32f3_discovery::leds::Direction;
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use stm32f3_discovery::leds::Leds;
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use stm32f3xx_hal::prelude::*;
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use stm32f3xx_hal::Toggle;
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use stm32f3_discovery::switch_hal::OutputSwitch;
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#[allow(dead_code)]
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type SerialType = Serial<USART2, (PA2<AF7<PushPull>>, PA3<AF7<PushPull>>)>;
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#[shared]
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struct Shared {
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tx_transfer: UartTxState,
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rx_transfer: Option<RxDmaTransferType>,
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}
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#[local]
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struct Local {
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leds: Leds,
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last_dir: Direction,
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verif_reporter: VerificationReporterCore,
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curr_dir: Iter<'static, Direction>,
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}
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#[monotonic(binds = SysTick, default = true)]
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type MonoTimer = Systick<1000>;
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#[init(local = [
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tc_pool_mem: [u8; TC_BUF_LEN * TC_POOL_SLOTS] = [0; TC_BUF_LEN * TC_POOL_SLOTS],
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tm_pool_mem: [u8; MAX_TM_LEN * TM_POOL_SLOTS] = [0; MAX_TM_LEN * TM_POOL_SLOTS]
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])]
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fn init(mut cx: init::Context) -> (Shared, Local, init::Monotonics) {
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let mut rcc = cx.device.RCC.constrain();
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let mono = Systick::new(cx.core.SYST, 8_000_000);
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logger_init();
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let mut flash = cx.device.FLASH.constrain();
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let clocks = rcc
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.cfgr
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.use_hse(8.MHz())
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.sysclk(8.MHz())
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.pclk1(8.MHz())
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.freeze(&mut flash.acr);
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// setup ITM output
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iprintln!(
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&mut cx.core.ITM.stim[0],
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"Starting sat-rs demo application for the STM32F3-Discovery"
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);
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let mut gpioe = cx.device.GPIOE.split(&mut rcc.ahb);
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// Assign memory to the pools.
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poolmod::TC::grow(cx.local.tc_pool_mem);
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poolmod::TM::grow(cx.local.tm_pool_mem);
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let verif_reporter = VerificationReporterCore::new(PUS_APID).unwrap();
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let leds = Leds::new(
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gpioe.pe8,
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gpioe.pe9,
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gpioe.pe10,
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gpioe.pe11,
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gpioe.pe12,
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gpioe.pe13,
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gpioe.pe14,
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gpioe.pe15,
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&mut gpioe.moder,
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&mut gpioe.otyper,
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);
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let mut gpioa = cx.device.GPIOA.split(&mut rcc.ahb);
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// USART2 pins
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let mut pins = (
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// TX pin: PA2
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gpioa
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.pa2
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.into_af_push_pull(&mut gpioa.moder, &mut gpioa.otyper, &mut gpioa.afrl),
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// RX pin: PA3
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gpioa
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.pa3
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.into_af_push_pull(&mut gpioa.moder, &mut gpioa.otyper, &mut gpioa.afrl),
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);
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pins.1.internal_pull_up(&mut gpioa.pupdr, true);
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let mut usart2 = Serial::new(
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cx.device.USART2,
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pins,
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UART_BAUD.Bd(),
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clocks,
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&mut rcc.apb1,
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);
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usart2.configure_rx_interrupt(RxEvent::Idle, Toggle::On);
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// This interrupt is enabled to re-schedule new transfers in the interrupt handler immediately.
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usart2.configure_tx_interrupt(TxEvent::TransmissionComplete, Toggle::On);
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let dma1 = cx.device.DMA1.split(&mut rcc.ahb);
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let (tx_serial, mut rx_serial) = usart2.split();
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// This interrupt is immediately triggered, clear it. It will only be reset
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// by the hardware when data is received on RX (RXNE event)
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rx_serial.clear_event(RxEvent::Idle);
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let rx_transfer = rx_serial.read_exact(unsafe { DMA_RX_BUF.as_mut_slice() }, dma1.ch6);
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info!(target: "init", "Spawning tasks");
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blink::spawn().unwrap();
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serial_tx_handler::spawn().unwrap();
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(
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Shared {
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tx_transfer: UartTxState::Idle(Some(TxIdle {
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tx: tx_serial,
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dma_channel: dma1.ch7,
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})),
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rx_transfer: Some(rx_transfer),
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},
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Local {
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leds,
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last_dir: Direction::North,
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curr_dir: Direction::iter(),
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verif_reporter,
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},
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init::Monotonics(mono),
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)
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}
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#[task(local = [leds, curr_dir, last_dir])]
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fn blink(cx: blink::Context) {
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let toggle_leds = |dir: &Direction| {
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let leds = cx.local.leds;
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let last_led = leds.for_direction(*cx.local.last_dir);
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last_led.off().ok();
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let led = leds.for_direction(*dir);
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led.on().ok();
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*cx.local.last_dir = *dir;
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};
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match cx.local.curr_dir.next() {
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Some(dir) => {
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toggle_leds(dir);
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}
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None => {
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*cx.local.curr_dir = Direction::iter();
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toggle_leds(cx.local.curr_dir.next().unwrap());
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}
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}
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blink::spawn_after(MsDuration::from_ticks(BLINK_FREQ_MS)).unwrap();
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}
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#[task(
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shared = [tx_transfer],
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local = []
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)]
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fn serial_tx_handler(mut cx: serial_tx_handler::Context) {
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if let Some((buf, len)) = TX_REQUESTS.dequeue() {
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cx.shared.tx_transfer.lock(|tx_state| match tx_state {
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UartTxState::Idle(tx) => {
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//debug!(target: "serial_tx_handler", "bytes: {:x?}", &buf[0..len]);
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// Safety: We only copy the data into the TX DMA buffer in this task.
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// If the DMA is active, another branch will be taken.
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let mut_tx_dma_buf = unsafe { &mut DMA_TX_BUF };
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// 0 sentinel value as start marker
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mut_tx_dma_buf[0] = 0;
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// Should never panic, we accounted for the overhead.
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// Write into transfer buffer directly, no need for intermediate
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// encoding buffer.
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let encoded_len = cobs::encode(&buf[0..len], &mut mut_tx_dma_buf[1..]);
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// 0 end marker
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mut_tx_dma_buf[encoded_len + 1] = 0;
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//debug!(target: "serial_tx_handler", "Sending {} bytes", encoded_len + 2);
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//debug!("sent: {:x?}", &mut_tx_dma_buf[0..encoded_len + 2]);
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let tx_idle = tx.take().unwrap();
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// Transfer completion and re-scheduling of new TX transfers will be done
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// by the IRQ handler.
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|
|
let transfer = tx_idle
|
||
|
|
.tx
|
||
|
|
.write_all(&mut_tx_dma_buf[0..encoded_len + 2], tx_idle.dma_channel);
|
||
|
|
*tx_state = UartTxState::Transmitting(Some(transfer));
|
||
|
|
// The memory block is automatically returned to the pool when it is dropped.
|
||
|
|
}
|
||
|
|
UartTxState::Transmitting(_) => {
|
||
|
|
// This is a SW configuration error. Only the ISR which
|
||
|
|
// detects transfer completion should be able to spawn a new
|
||
|
|
// task, and that ISR should set the state to IDLE.
|
||
|
|
panic!("invalid internal tx state detected")
|
||
|
|
}
|
||
|
|
})
|
||
|
|
} else {
|
||
|
|
cx.shared.tx_transfer.lock(|tx_state| {
|
||
|
|
if let UartTxState::Idle(_) = tx_state {
|
||
|
|
serial_tx_handler::spawn_after(MsDuration::from_ticks(TX_HANDLER_FREQ_MS))
|
||
|
|
.unwrap();
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#[task(
|
||
|
|
local = [
|
||
|
|
stamp_buf: [u8; 7] = [0; 7],
|
||
|
|
decode_buf: [u8; MAX_TC_LEN] = [0; MAX_TC_LEN],
|
||
|
|
src_data_buf: [u8; MAX_TM_LEN] = [0; MAX_TM_LEN],
|
||
|
|
verif_reporter
|
||
|
|
],
|
||
|
|
)]
|
||
|
|
fn serial_rx_handler(
|
||
|
|
cx: serial_rx_handler::Context,
|
||
|
|
received_packet: Box<poolmod::TC>,
|
||
|
|
rx_len: usize,
|
||
|
|
) {
|
||
|
|
let tgt: &'static str = "serial_rx_handler";
|
||
|
|
cx.local.stamp_buf[0] = P_FIELD_BASE;
|
||
|
|
info!(target: tgt, "Received packet with {} bytes", rx_len);
|
||
|
|
let decode_buf = cx.local.decode_buf;
|
||
|
|
let packet = received_packet.as_slice();
|
||
|
|
let mut start_idx = None;
|
||
|
|
for (idx, byte) in packet.iter().enumerate() {
|
||
|
|
if *byte != 0 {
|
||
|
|
start_idx = Some(idx);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if start_idx.is_none() {
|
||
|
|
warn!(
|
||
|
|
target: tgt,
|
||
|
|
"decoding error, can only process cobs encoded frames, data is all 0"
|
||
|
|
);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
let start_idx = start_idx.unwrap();
|
||
|
|
match cobs::decode(&received_packet.as_slice()[start_idx..], decode_buf) {
|
||
|
|
Ok(len) => {
|
||
|
|
info!(target: tgt, "Decoded packet length: {}", len);
|
||
|
|
let pus_tc = PusTc::from_bytes(decode_buf);
|
||
|
|
let verif_reporter = cx.local.verif_reporter;
|
||
|
|
match pus_tc {
|
||
|
|
Ok((tc, tc_len)) => handle_tc(
|
||
|
|
tc,
|
||
|
|
tc_len,
|
||
|
|
verif_reporter,
|
||
|
|
cx.local.src_data_buf,
|
||
|
|
cx.local.stamp_buf,
|
||
|
|
tgt,
|
||
|
|
),
|
||
|
|
Err(e) => {
|
||
|
|
warn!(target: tgt, "Error unpacking PUS TC: {}", e);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
Err(_) => {
|
||
|
|
warn!(
|
||
|
|
target: tgt,
|
||
|
|
"decoding error, can only process cobs encoded frames"
|
||
|
|
)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
fn handle_tc(
|
||
|
|
tc: PusTc,
|
||
|
|
tc_len: usize,
|
||
|
|
verif_reporter: &mut VerificationReporterCore,
|
||
|
|
src_data_buf: &mut [u8; MAX_TM_LEN],
|
||
|
|
stamp_buf: &[u8; 7],
|
||
|
|
tgt: &'static str,
|
||
|
|
) {
|
||
|
|
info!(
|
||
|
|
target: tgt,
|
||
|
|
"Found PUS TC [{},{}] with length {}",
|
||
|
|
tc.service(),
|
||
|
|
tc.subservice(),
|
||
|
|
tc_len
|
||
|
|
);
|
||
|
|
|
||
|
|
let token = verif_reporter.add_tc(&tc);
|
||
|
|
if tc.apid() != PUS_APID {
|
||
|
|
warn!(target: tgt, "Received tc with unknown APID {}", tc.apid());
|
||
|
|
let sendable = verif_reporter
|
||
|
|
.acceptance_failure(
|
||
|
|
src_data_buf,
|
||
|
|
token,
|
||
|
|
&SEQ_COUNT_PROVIDER,
|
||
|
|
FailParams::new(stamp_buf, &EcssEnumU16::new(0), None),
|
||
|
|
)
|
||
|
|
.unwrap();
|
||
|
|
let mem_block = poolmod::TM::alloc().unwrap().init([0u8; MAX_TM_LEN]);
|
||
|
|
let mut sender = TmSender::new(mem_block, tgt);
|
||
|
|
if let Err(e) =
|
||
|
|
verif_reporter.send_acceptance_failure(sendable, &SEQ_COUNT_PROVIDER, &mut sender)
|
||
|
|
{
|
||
|
|
warn!(target: tgt, "Sending acceptance failure failed: {:?}", e.0);
|
||
|
|
};
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
let sendable = verif_reporter
|
||
|
|
.acceptance_success(src_data_buf, token, &SEQ_COUNT_PROVIDER, stamp_buf)
|
||
|
|
.unwrap();
|
||
|
|
|
||
|
|
let mem_block = poolmod::TM::alloc().unwrap().init([0u8; MAX_TM_LEN]);
|
||
|
|
let mut sender = TmSender::new(mem_block, tgt);
|
||
|
|
let accepted_token = match verif_reporter.send_acceptance_success(
|
||
|
|
sendable,
|
||
|
|
&SEQ_COUNT_PROVIDER,
|
||
|
|
&mut sender,
|
||
|
|
) {
|
||
|
|
Ok(token) => token,
|
||
|
|
Err(e) => {
|
||
|
|
warn!(target: "serial_rx_handler", "Sending acceptance success failed: {:?}", e.0);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
if tc.service() == 17 {
|
||
|
|
if tc.subservice() == 1 {
|
||
|
|
let sendable = verif_reporter
|
||
|
|
.start_success(src_data_buf, accepted_token, &SEQ_COUNT_PROVIDER, stamp_buf)
|
||
|
|
.unwrap();
|
||
|
|
let mem_block = poolmod::TM::alloc().unwrap().init([0u8; MAX_TM_LEN]);
|
||
|
|
let mut sender = TmSender::new(mem_block, tgt);
|
||
|
|
let started_token = match verif_reporter.send_start_success(
|
||
|
|
sendable,
|
||
|
|
&SEQ_COUNT_PROVIDER,
|
||
|
|
&mut sender,
|
||
|
|
) {
|
||
|
|
Ok(token) => token,
|
||
|
|
Err(e) => {
|
||
|
|
warn!(target: tgt, "Sending acceptance success failed: {:?}", e.0);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
info!(
|
||
|
|
target: tgt,
|
||
|
|
"Received PUS ping telecommand, sending ping reply TM[17,2]"
|
||
|
|
);
|
||
|
|
let mut sp_header =
|
||
|
|
SpHeader::tc_unseg(PUS_APID, SEQ_COUNT_PROVIDER.get(), 0).unwrap();
|
||
|
|
let sec_header = PusTmSecondaryHeader::new_simple(17, 2, stamp_buf);
|
||
|
|
let ping_reply = PusTm::new(&mut sp_header, sec_header, None, true);
|
||
|
|
let mut mem_block = poolmod::TM::alloc().unwrap().init([0u8; MAX_TM_LEN]);
|
||
|
|
let reply_len = ping_reply.write_to_bytes(mem_block.as_mut_slice()).unwrap();
|
||
|
|
if TX_REQUESTS.enqueue((mem_block, reply_len)).is_err() {
|
||
|
|
warn!(target: tgt, "TC queue full");
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
SEQ_COUNT_PROVIDER.increment();
|
||
|
|
let sendable = verif_reporter
|
||
|
|
.completion_success(src_data_buf, started_token, &SEQ_COUNT_PROVIDER, stamp_buf)
|
||
|
|
.unwrap();
|
||
|
|
let mem_block = poolmod::TM::alloc().unwrap().init([0u8; MAX_TM_LEN]);
|
||
|
|
let mut sender = TmSender::new(mem_block, tgt);
|
||
|
|
if let Err(e) = verif_reporter.send_step_or_completion_success(
|
||
|
|
sendable,
|
||
|
|
&SEQ_COUNT_PROVIDER,
|
||
|
|
&mut sender,
|
||
|
|
) {
|
||
|
|
warn!(target: tgt, "Sending completion success failed: {:?}", e.0);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
// TODO: Invalid subservice
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#[task(binds = DMA1_CH6, shared = [rx_transfer])]
|
||
|
|
fn rx_dma_isr(mut cx: rx_dma_isr::Context) {
|
||
|
|
cx.shared.rx_transfer.lock(|rx_transfer| {
|
||
|
|
let rx_ref = rx_transfer.as_ref().unwrap();
|
||
|
|
if rx_ref.is_complete() {
|
||
|
|
let uart_rx_owned = rx_transfer.take().unwrap();
|
||
|
|
let (buf, c, rx) = uart_rx_owned.stop();
|
||
|
|
// The received data is transferred to another task now to avoid any processing overhead
|
||
|
|
// during the interrupt. There are multiple ways to do this, we use a memory pool here
|
||
|
|
// to do this.
|
||
|
|
let mut mem_block = poolmod::TC::alloc()
|
||
|
|
.expect("allocating memory block for rx failed")
|
||
|
|
.init([0u8; TC_BUF_LEN]);
|
||
|
|
// Copy data into memory pool.
|
||
|
|
mem_block.copy_from_slice(buf);
|
||
|
|
*rx_transfer = Some(rx.read_exact(buf, c));
|
||
|
|
// Only send owning pointer to pool memory and the received packet length.
|
||
|
|
serial_rx_handler::spawn(mem_block, TC_BUF_LEN)
|
||
|
|
.expect("spawning rx handler task failed");
|
||
|
|
// If this happens, there is a high chance that the maximum packet length was
|
||
|
|
// exceeded. Circular mode is not used here, so data might be missed.
|
||
|
|
warn!(
|
||
|
|
"rx transfer with maximum length {}, might miss data",
|
||
|
|
TC_BUF_LEN
|
||
|
|
);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
#[task(binds = USART2_EXTI26, shared = [rx_transfer, tx_transfer])]
|
||
|
|
fn serial_isr(mut cx: serial_isr::Context) {
|
||
|
|
cx.shared.tx_transfer.lock(|tx_state| match tx_state {
|
||
|
|
UartTxState::Idle(_) => (),
|
||
|
|
UartTxState::Transmitting(transfer) => {
|
||
|
|
let transfer_ref = transfer.as_ref().unwrap();
|
||
|
|
if transfer_ref.is_complete() {
|
||
|
|
let transfer = transfer.take().unwrap();
|
||
|
|
let (_, dma_channel, tx) = transfer.stop();
|
||
|
|
*tx_state = UartTxState::Idle(Some(TxIdle { tx, dma_channel }));
|
||
|
|
serial_tx_handler::spawn_after(MsDuration::from_ticks(
|
||
|
|
MIN_DELAY_BETWEEN_TX_PACKETS_MS.into(),
|
||
|
|
))
|
||
|
|
.unwrap();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
});
|
||
|
|
cx.shared.rx_transfer.lock(|rx_transfer| {
|
||
|
|
let rx_transfer_ref = rx_transfer.as_ref().unwrap();
|
||
|
|
// Received a partial packet.
|
||
|
|
if rx_transfer_ref.is_event_triggered(RxEvent::Idle) {
|
||
|
|
let rx_transfer_owned = rx_transfer.take().unwrap();
|
||
|
|
let (buf, ch, mut rx, rx_len) = rx_transfer_owned.stop_and_return_received_bytes();
|
||
|
|
// The received data is transferred to another task now to avoid any processing overhead
|
||
|
|
// during the interrupt. There are multiple ways to do this, we use a memory pool here
|
||
|
|
// to do this.
|
||
|
|
let mut mem_block = poolmod::TC::alloc()
|
||
|
|
.expect("allocating memory block for rx failed")
|
||
|
|
.init([0u8; TC_BUF_LEN]);
|
||
|
|
// Copy data into memory pool.
|
||
|
|
mem_block[0..rx_len as usize].copy_from_slice(&buf[0..rx_len as usize]);
|
||
|
|
rx.clear_event(RxEvent::Idle);
|
||
|
|
// Only send owning pointer to pool memory and the received packet length.
|
||
|
|
serial_rx_handler::spawn(mem_block, rx_len as usize)
|
||
|
|
.expect("spawning rx handler task failed");
|
||
|
|
*rx_transfer = Some(rx.read_exact(buf, ch));
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|