timer HAL

semestralka_1_final_crate/software_uart/src/dma_timer.rs

@@ -2,18 +2,16 @@
 
 use embassy_stm32::{
     peripherals::{TIM6, TIM7},
-    rcc,
     timer::low_level::Timer,
     Peri,
+    time::Hertz,
 };
 use core::mem;
 use embassy_stm32::timer::BasicInstance;
-use embassy_stm32::pac::timer::vals::Urs;
 
 /// Initializes TIM6 to tick at `baud * oversample` frequency.
 /// Each TIM6 update event triggers one DMA beat.
 pub fn init_tim6_for_uart<'d>(tim6: Peri<'d, TIM6>, baud: u32, oversample: u16) {
-    rcc::enable_and_reset::<TIM6>();
     let ll = Timer::new(tim6);
     configure_basic_timer(&ll, baud, oversample);
     mem::forget(ll);
@@ -22,46 +20,20 @@ pub fn init_tim6_for_uart<'d>(tim6: Peri<'d, TIM6>, baud: u32, oversample: u16)
 /// Initializes TIM7 to tick at `baud * oversample` frequency.
 /// Each TIM7 update event triggers one DMA beat.
 pub fn init_tim7_for_uart<'d>(tim7: Peri<'d, TIM7>, baud: u32, oversample: u16) {
-    rcc::enable_and_reset::<TIM7>();
     let ll = Timer::new(tim7);
     configure_basic_timer(&ll, baud, oversample);
-    // Enable Update Interrupt (UIE)
+    ll.enable_update_interrupt(false); //Disable CPU interrupts
-    ll.regs_basic().dier().modify(|w| {
-        w.set_ude(true);
-        w.set_uie(false);
-    });
     mem::forget(ll);
 }
 
-// Shared internal helper — identical CR1/ARR setup
 fn configure_basic_timer<T: BasicInstance>(ll: &Timer<'_, T>, baud: u32, oversample: u16) {
-    let f_timer = rcc::frequency::<T>().0;
     let target = baud.saturating_mul(oversample.max(1) as u32).max(1);
+    let target_freq = Hertz(target);
 
-    // Compute ARR (prescaler = 0)
+    ll.stop();
-    // let mut arr = (f_timer / target).saturating_sub(1) as u16;
+    ll.set_frequency(target_freq);
-    let mut arr = ((f_timer + target / 2) / target).saturating_sub(1) as u16;
+    ll.enable_update_dma(true);
-    if arr == 0 { arr = 1; }
 
-    ll.regs_basic().cr1().write(|w| {
+    ll.clear_update_interrupt();
-        w.set_cen(false);
+    ll.start();
-        w.set_opm(false);
-        w.set_udis(false);
-        w.set_urs(Urs::ANY_EVENT);
-    });
-
-    ll.regs_basic().psc().write_value(0u16);
-    ll.regs_basic().arr().write(|w| w.set_arr(arr));
-    ll.regs_basic().dier().modify(|w| w.set_ude(true));
-    ll.regs_basic().egr().write(|w| w.set_ug(true));
-
-    // Clear spurious UIF from UG trigger
-    ll.regs_basic().sr().modify(|w| w.set_uif(false));
-
-    ll.regs_basic().cr1().write(|w| {
-        w.set_opm(false);
-        w.set_cen(true);
-        w.set_udis(false);
-        w.set_urs(Urs::ANY_EVENT);
-    });
 }

semestralka_1_final_crate/software_uart/src/gpio_dma_uart_rx.rs

@@ -1,4 +1,5 @@
-// src/runtime.rs
+// src/gpio_dma_uart_rx.rs
+
 use embassy_executor::task;
 use embassy_stm32::{
     dma::Request,
@@ -34,15 +35,21 @@ pub async fn rx_dma_task(
     opts.complete_transfer_ir = true;
 
     // SAFETY: ring is exclusive to this task
-    let mut rx = unsafe { ReadableRingBuffer::new(ch, TIM7_UP_REQ, register, ring, opts) };
+    let mut rx = unsafe {
+        ReadableRingBuffer::new(
+            ch,
+            TIM7_UP_REQ,
+            register,
+            ring,
+            opts
+        )
+    };
     rx.start();
 
-    // We read into the second half of a buffer, keeping "leftovers" in the first half.
     const CHUNK_SIZE: usize = 4096;
     const HISTORY_SIZE: usize = 512;
     const TOTAL_BUF_SIZE: usize = HISTORY_SIZE + CHUNK_SIZE;
     
-    // Logic level buffer
     let mut level_buf = [0u8; TOTAL_BUF_SIZE];
     let mut valid_len = 0usize; 
 
@@ -51,6 +58,7 @@ pub async fn rx_dma_task(
     loop {
         let _ = rx.read_exact(&mut raw_chunk).await;
 
+        // Extract Rx pin value from IDR
         for (i, b) in raw_chunk.iter().enumerate() {
              level_buf[valid_len + i] = ((*b >> rx_pin_bit) & 1) as u8;
         }
@@ -65,27 +73,23 @@ pub async fn rx_dma_task(
         if !decoded.is_empty() {
              pipe_rx.write(decoded.as_slice()).await;
 
-             for byte in decoded.as_slice() {
+             // for byte in decoded.as_slice() {
                  // info!("DMA BUFFER CHAR: {} (ASCII: {})", *byte, *byte as char);
-             }
+             // }
         }
 
         // Shift remaining data to front
         // We processed 'consumed' samples.
-        // We keep everything from 'consumed' up to 'current_end'.
+        // Keeping the rest of the data
         let remaining = current_end - consumed;
         
-        // SAFETY if remaining > HISTORY_SIZE, we are in trouble (buffer too small / decoder stuck).
         if remaining > 0 {
             level_buf.copy_within(consumed..current_end, 0);
         }
         valid_len = remaining;
         
-        // If valid_len grows too large (decoder not consuming), we must discard to avoid panic on next write
+        // SAFETY if decoder is stuck and buffer is filling up, discard old data
         if valid_len >= HISTORY_SIZE {
-             // Discard oldest to make space
-             // logic: we move the last (HISTORY_SIZE/2) to 0.
-             // This effectively "skips" garbage data.
              let keep = HISTORY_SIZE / 2;
              level_buf.copy_within(valid_len - keep..valid_len, 0);
              valid_len = keep;

semestralka_1_final_crate/software_uart/src/gpio_dma_uart_tx.rs

@@ -42,13 +42,12 @@ pub async fn encode_uart_frames<'a>(
 pub async fn tx_dma_task(
     mut ch: Peri<'static, GPDMA1_CH0>,
     register: *mut u32, // GPIOx_BSRR
-    _tx_ring_mem: &'static mut [u32],
+    tx_ring_mem: &'static mut [u32],
     pipe_rx: &'static Pipe<CriticalSectionRawMutex, 1024>,
     tx_pin_bit: u8,
     uart_cfg: &'static UartConfig,
 ) {
     info!("TX DMA task ready (One‑shot)");
-
     let mut frame_buf = [0u32; 4096];
     let mut rx_buf = [0u8; 256];
     let tim6 = embassy_stm32::pac::TIM6;

semestralka_1_final_crate/software_uart/src/uart_emulation.rs

@@ -1,4 +1,5 @@
 // src/uart_emulation.rs
+
 use heapless::Vec;
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
@@ -43,6 +44,7 @@ pub fn encode_uart_byte_cfg(
     // let set_low = |bit: u8| -> u32 { 0 }; // ODR
     let set_low = |bit: u8| -> u32 { 1u32 << (bit as u32 + 16) }; // BSRR
 
+    let nbits = cfg.data_bits;
     let mut idx = 0usize;
 
     // START bit (LOW)
@@ -50,7 +52,6 @@ pub fn encode_uart_byte_cfg(
     idx += 1;
 
     // Data bits, LSB-first
-    let nbits = cfg.data_bits.clamp(5, 8);
     for i in 0..nbits {
         let one = ((data >> i) & 1) != 0;
         out[idx] = if one { set_high(pin_bit) } else { set_low(pin_bit) };
@@ -79,8 +80,8 @@ pub fn encode_uart_byte_cfg(
 
     // STOP bits (HIGH)
     let stop_ticks = match cfg.stop_bits {
-        StopBits::One => 1usize,
+        StopBits::One => 1,
-        StopBits::Two => 2usize,
+        StopBits::Two => 2,
     };
     for _ in 0..stop_ticks {
         out[idx] = set_high(pin_bit);
@@ -136,14 +137,11 @@ pub fn decode_uart_samples(
         }
     };
 
-    // Loop while we have enough remaining samples for a full frame
+    // Decode while remaining samples for a full frame
     while idx + frame_len <= samples.len() {
-        // Wait for falling edge (High -> Low)
+        // Start - idle HIGH to start LOW
-        // samples[idx] == 1 (Idle/Stop) && samples[idx+1] == 0 (Start)
         if samples[idx] != 0 && samples[idx + 1] == 0 {
-            // Align to center of START bit
+            let center_offset = ovs / 2;
-            // Start bit begins at idx+1. Center is at idx + 1 + (ovs/2)
-            let center_offset = 1 + (ovs / 2);
             let mut scan_idx = idx + center_offset;
 
             // Validate Start Bit
@@ -164,33 +162,39 @@ pub fn decode_uart_samples(
                 scan_idx += ovs;
             }
 
-            // Skip Parity
+            let mut error_data = false;
             if cfg.parity != Parity::None {
+                let expected_parity = calculate_parity(data, cfg.parity, cfg.data_bits);
+                let actual_parity = get_bit(scan_idx);
+                if expected_parity != actual_parity {
+                    // Parity error
+                    error_data = true;
+                }
                 scan_idx += ovs;
             }
 
-            // Validate Stop Bit (Must be 1)
+            for _ in 0..stop_bits_count {
-            // If stop bit is 0, it's a framing error. We reject the whole byte.
                 if get_bit(scan_idx) == 0 {
-                idx += 1; // Next sample
+                    // Framing error
-                continue;
+                    error_data = true;
+                    break;
+                }
+                scan_idx += ovs;
+            }
+            if error_data {
+                idx += 1;
+                continue;  // Skip this frame completely
             }
 
-            // Byte is valid
             let _ = out.push(data);
-
-            // Active Resync: Fast-forward through the stop bit(s) and idle time
-            // scan_idx is currently at the center of the Stop bit.
             idx = scan_idx;
-            // Advance while we are reading High (1).
+
-            // As soon as we see Low (0), we stop. That 0 is the beginning of the NEXT start bit.
+            // Next startbit reach
-            // The outer loop expects `idx` to be the High *before* the start bit, so we will handle that.
             while idx < samples.len() && samples[idx] != 0 {
                 idx += 1;
             }
-            // Back up one step.
+
-            // The outer loop logic is: `if samples[idx] != 0 && samples[idx+1] == 0`.
+            // Mensi hack
-            // If we stopped at `idx` because it was 0, then `idx-1` was the last 1 (Idle).
             if idx > 0 {
                 idx -= 1;
             }
@@ -202,3 +206,21 @@ pub fn decode_uart_samples(
 
     (out, idx)
 }
+
+/// Calculate the expected parity bit (0 or 1) for the given data and parity mode
+fn calculate_parity(data: u8, parity: Parity, data_bits: u8) -> u8 {
+    match parity {
+        Parity::None => 0,
+        Parity::Even | Parity::Odd => {
+            // Mask to only count bits that are part of the data
+            let mask: u8 = if data_bits == 8 { 0xFF } else { ((1u16 << data_bits) - 1) as u8 };
+            
+            let ones = (data & mask).count_ones() & 1;
+            match parity {
+                Parity::Even => ones as u8,  // If ones=1 (odd), emit 1 to make even
+                Parity::Odd => (ones ^ 1) as u8,  // XOR - If ones=1 (odd), emit 0 to keep odd
+                _ => 0,
+            }
+        }
+    }
+}