From a93965eccf1478a05810e26c89d099d5a7deaf7f Mon Sep 17 00:00:00 2001
From: Priec <filippriec@gmail.com>
Date: Sun, 17 May 2026 23:09:21 +0200
Subject: [PATCH] polish:

---
 2sem_sem2/src/bin/main.rs |  4 ++--
 2sem_sem2/src/send.rs     | 36 ++++++++++++++++--------------------
 2 files changed, 18 insertions(+), 22 deletions(-)

diff --git a/2sem_sem2/src/bin/main.rs b/2sem_sem2/src/bin/main.rs
index 7940917..24f05d9 100644
--- a/2sem_sem2/src/bin/main.rs
+++ b/2sem_sem2/src/bin/main.rs
@@ -16,8 +16,8 @@ use semestralka2::send::*;
 
 use {defmt_rtt as _, panic_probe as _};
 
-static PIPE: Channel<CriticalSectionRawMutex, u8, 64> = Channel::new();
-static PIPE_REC: Channel<CriticalSectionRawMutex, u8, 64> = Channel::new();
+static PIPE: Channel<CriticalSectionRawMutex, u8, 128> = Channel::new();
+static PIPE_REC: Channel<CriticalSectionRawMutex, u8, 128> = Channel::new();
 // static REC_ALLOWED: AtomicBool = AtomicBool::new(true);
 
 #[embassy_executor::main]
diff --git a/2sem_sem2/src/send.rs b/2sem_sem2/src/send.rs
index ebdf57c..b6a4fcb 100644
--- a/2sem_sem2/src/send.rs
+++ b/2sem_sem2/src/send.rs
@@ -1,14 +1,11 @@
 // src/send.rs
 
-use core::sync::atomic::{AtomicBool, Ordering};
-use defmt::info;
 use embassy_stm32::gpio::Output;
 use embassy_sync::{
     blocking_mutex::raw::CriticalSectionRawMutex,
     channel::{Receiver, Sender},
 };
 use embassy_time::{Duration, Ticker};
-use heapless::Vec;
 
 const START: u8 = 0x7E;
 const STOP: u8 = 0x81;
@@ -16,18 +13,6 @@ const BIT_PERIOD: Duration = Duration::from_millis(10);
 
 type Tx = Sender<'static, CriticalSectionRawMutex, u8, 128>;
 
-fn crc8(data: &[u8]) -> u8 {
-    let mut crc: u8 = 0;
-    for &b in data {
-        crc ^= b;
-        for _ in 0..8 {
-            let mask = if (crc & 0x80) != 0 { 0x07 } else { 0 };
-            crc = (crc << 1) ^ mask;
-        }
-    }
-    crc
-}
-
 async fn send_byte(byte: u8, tx: &Tx) {
     for i in (0..8).rev() {
         tx.send((byte >> i) & 1).await;
@@ -46,12 +31,11 @@ pub async fn nrz(payload: &[u8], tx: &Tx) {
         send_byte(b, tx).await;
     }
 
-    let mut buf: Vec<u8, 64> = Vec::new();
-    let _ = buf.push(len);
+    // crc
+    let mut crc = crc8(0, len);
     for &b in payload {
-        let _ = buf.push(b);
+        crc = crc8(crc, b);
     }
-    let crc = crc8(&buf);
     send_byte(crc, tx).await;
 
     let mut ones = len.count_ones() + crc.count_ones();
@@ -66,10 +50,22 @@ pub async fn nrz(payload: &[u8], tx: &Tx) {
     tx.send(1).await;
 }
 
+fn crc8(crc: u8, byte: u8) -> u8 {
+    let mut c = crc ^ byte;
+    for _ in 0..8 {
+        c = if c & 0x80 != 0 {
+            (c << 1) ^ 0x07
+        } else {
+            c << 1
+        };
+    }
+    c
+}
+
 #[embassy_executor::task]
 pub async fn bit_send(
     mut pin: Output<'static>,
-    rx: Receiver<'static, CriticalSectionRawMutex, u8, 64>,
+    rx: Receiver<'static, CriticalSectionRawMutex, u8, 128>,
 ) {
     let mut ticker = Ticker::every(BIT_PERIOD);
     loop {