From 24d1da44aa398eae89d45edbd888ae766772e580 Mon Sep 17 00:00:00 2001
From: Priec <filippriec@gmail.com>
Date: Wed, 19 Nov 2025 21:12:41 +0100
Subject: [PATCH] working at the baud rate 600

---
 semestralka_1e_tx_bez_dma/Cargo.lock      |  8 +++----
 semestralka_1e_tx_bez_dma/src/bin/main.rs | 28 +++++++++++++++--------
 semestralka_1e_tx_bez_dma/src/config.rs   |  2 +-
 3 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/semestralka_1e_tx_bez_dma/Cargo.lock b/semestralka_1e_tx_bez_dma/Cargo.lock
index fdfde1a..b12cb20 100644
--- a/semestralka_1e_tx_bez_dma/Cargo.lock
+++ b/semestralka_1e_tx_bez_dma/Cargo.lock
@@ -1064,17 +1064,17 @@ dependencies = [
 
 [[package]]
 name = "stm32-fmc"
-version = "0.4.0"
+version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72692594faa67f052e5e06dd34460951c21e83bc55de4feb8d2666e2f15480a2"
+checksum = "c7f0639399e2307c2446c54d91d4f1596343a1e1d5cab605b9cce11d0ab3858c"
 dependencies = [
- "embedded-hal 1.0.0",
+ "embedded-hal 0.2.7",
 ]
 
 [[package]]
 name = "stm32-metapac"
 version = "18.0.0"
-source = "git+https://github.com/embassy-rs/stm32-data-generated?tag=stm32-data-22374e3344a2c9150b9b3d4da45c03f398fdc54e#31546499ddabe97044beae13ca8b535575b52a56"
+source = "git+https://github.com/embassy-rs/stm32-data-generated?tag=stm32-data-b9f6b0c542d85ee695d71c35ced195e0cef51ac0#9b8fb67703361e2237b6c1ec4f1ee5949223d412"
 dependencies = [
  "cortex-m",
  "cortex-m-rt",
diff --git a/semestralka_1e_tx_bez_dma/src/bin/main.rs b/semestralka_1e_tx_bez_dma/src/bin/main.rs
index b72aff2..1663cf5 100644
--- a/semestralka_1e_tx_bez_dma/src/bin/main.rs
+++ b/semestralka_1e_tx_bez_dma/src/bin/main.rs
@@ -100,20 +100,14 @@ async fn main(spawner: Spawner) {
 
         counter += 1;
         let msg = if counter % 2 == 0 {
-            b"AAAAA\n"
+            b"AAAAA\r\n"
         } else {
-            b"Hello\n"
+            b"Hello\r\n"
         };
         PIPE_SW_TX.write(msg).await;
         info!("Sent: {:a}", msg);
 
-        Timer::after(Duration::from_millis(100)).await;
-        
-        // Also read any incoming data from internal UART RX pipe
-        let n2 = PIPE_INT_RX.read(&mut buf).await;
-        if n2 > 0 {
-            info!("HW INT UART RX pipe: {:a}", &buf[..n2]);
-        }
+        Timer::after(Duration::from_secs(3)).await;
 
         yield_now().await;
     }
@@ -156,6 +150,7 @@ pub async fn tx_cpu_task(
 ) {
     use dma_gpio::software_uart::uart_emulation::encode_uart_byte_cfg;
     use embassy_futures::yield_now;
+    use dma_gpio::config::{TX_PIN_BIT, UART_CFG};
 
     // Access TIM6 registers directly via PAC
     let tim6_regs = embassy_stm32::pac::TIM6;
@@ -171,11 +166,24 @@ pub async fn tx_cpu_task(
 
         for &byte in &rx_buf[..n] {
             let used = encode_uart_byte_cfg(TX_PIN_BIT, byte, &UART_CFG, &mut frame_buf);
+
+            // === SYNC LOGIC ===
+            // Reset timer counter to 0 using Event Generation Register (UG bit)
+            // This ensures we start counting exactly from now.
+            tim6_regs.egr().write(|w| w.set_ug(true));
+            // The UG event sets the UIF flag immediately. We must clear it.
+            tim6_regs.sr().write(|w| w.set_uif(false));
+
+            // Now we loop through the encoded frame.
+            // Since we just reset the timer and cleared UIF, the first wait
+            // will block for exactly 1 bit-period.
+            // This effectively adds 1 bit of idle time before the Start Bit,
+            // which guarantees the line is stable High before dropping Low.
             for word in &frame_buf[..used] {
                 while !tim6_regs.sr().read().uif() {
                     yield_now().await;
                 }
-                tim6_regs.sr().modify(|w| w.set_uif(false));
+                tim6_regs.sr().write(|w| w.set_uif(false));
                 unsafe { core::ptr::write_volatile(bsrr_ptr, *word) };
             }
         }
diff --git a/semestralka_1e_tx_bez_dma/src/config.rs b/semestralka_1e_tx_bez_dma/src/config.rs
index 2d88a77..39cfefd 100644
--- a/semestralka_1e_tx_bez_dma/src/config.rs
+++ b/semestralka_1e_tx_bez_dma/src/config.rs
@@ -3,7 +3,7 @@ use crate::software_uart::uart_emulation::{Parity, StopBits, UartConfig};
 use embassy_sync::blocking_mutex::raw::CriticalSectionRawMutex;
 use embassy_sync::pipe::Pipe;
 
-pub const BAUD: u32 = 115_200;
+pub const BAUD: u32 = 600;
 // pub const TX_PIN_BIT: u8 = 2; // PA2
 // pub const RX_PIN_BIT: u8 = 3; // PA3
 pub const TX_PIN_BIT: u8 = 0; // PB2