✨ feat: UART monitor, step timeouts, and non-blocking subprocess output

Based on real hardware timing data from XC7Z100 testing:

UART Monitoring:
- New UartMonitor class in serial_monitor.py: background thread reads
  serial output continuously, parses for IP/version/boot messages
- GUI starts monitor when workflow runs, stops on completion/close
- Serial lines flow into log display in real time

Step Timing:
- New step_timeouts config (experience × 2):
  check_env:30s flash_erase:120s flash_program:600s
  bitstream:60s elf_download:60s tftp_reboot:120s
- GUI shows estimated timeout before each step
- Shows actual elapsed time after each step completes
- All subprocess calls now use config-driven timeouts

Non-blocking Output:
- New subprocess_utils.py: run_streaming() uses Popen + threaded
  stdout/stderr readers, parses WARNING/ERROR/progress% in real time
- flash_programmer and bitstream_programmer use it
- Callbacks receive categorized events (out/err/warn/error/progress/done)

config.yaml

@@ -0,0 +1,24 @@
+bootloader_bin_path: /home/ly0kos/work/Verify/FW/tftp_app/bootloader/bootloader_z100_800M.bin
+bootloader_bit_path: /home/ly0kos/work/Verify/FW/tftp_app/bootloader/pl_arm_wrapper_hw_platform_0/pl_arm_wrapper.bit
+bootloader_elf_path: /home/ly0kos/work/Verify/FW/tftp_app/bootloader/app.elf
+firmware_bin_path: /home/ly0kos/work/Verify/FW/V1.3.1.3.3_06_01_pmu_cpld_check/V1.3.1.3.3_06_01_pmu_cpld_check.bin
+flash_type: qspi-x4-single
+fsbl_elf_path: /home/ly0kos/work/Verify/FPGA/Xilinx/Z100/fsbl_qspi_bypass.elf
+inter_step_delay: 2
+ping_count: 3
+ping_timeout: 5
+reboot_timeout: 30
+serial_baudrate: 115200
+serial_port: /dev/ttyUSB0
+tftp_upload_name: z7bin
+uart_delay: 3
+inter_step_delay: 2
+step_timeouts:
+  check_env: 30
+  flash_erase: 120
+  flash_program: 600
+  bitstream: 60
+  elf_download: 60
+  tftp_reboot: 120
+vitis_path: ""
+zynq_ip: 192.168.100.11

config/default_config.yaml

@@ -35,3 +35,16 @@ reboot_timeout: 30
 # Ping verification settings
 ping_timeout: 5
 ping_count: 3
+
+# Step timing (seconds) — used for progress bar max and timeout (experience × 2)
+step_timeouts:
+  check_env: 30      # Step 1: tool detection + JTAG scan (~5s actual)
+  flash_erase: 120   # Step 2a: QSPI chip erase (~40s actual for 17MB)
+  flash_program: 600 # Step 2b: QSPI program+verify (~300s actual for 17MB at x4)
+  bitstream: 60      # Step 3a: FPGA configuration via JTAG (~16s actual)
+  elf_download: 60   # Step 3b: ELF download to PS via JTAG (~9s actual)
+  tftp_reboot: 120   # Step 4: TFTP upload + reboot + boot verify (~30s network)
+
+# Delays (seconds)
+inter_step_delay: 2
+uart_delay: 3

src/bitstream_programmer.py

@@ -117,21 +117,17 @@ def _run_command(
     Raises:
         subprocess.TimeoutExpired: If command exceeds timeout.
     """
+    from subprocess_utils import run_streaming
+
     if callback:
         callback("running", f"Executing: {' '.join(cmd)}")
 
-    result = subprocess.run(
+    try:
-        cmd,
+        return run_streaming(cmd, timeout=timeout, callback=callback)
-        capture_output=True,
+    except subprocess.TimeoutExpired:
-        text=True,
+        if callback:
-        timeout=timeout,
+            callback("error", f"{cmd[0]} timed out after {timeout}s")
-    )
+        raise
-    if callback:
-        if result.returncode == 0:
-            callback("complete", f"{cmd[0]} succeeded")
-        else:
-            callback("error", f"{cmd[0]} failed (exit {result.returncode})")
-    return result
 
 
 # ── Bitstream Download ──────────────────────────────────────────────
@@ -172,7 +168,8 @@ def program_bitstream(
     # Try xsct first (preferred)
     xsct = get_xsct_path(config.vitis_path)
     if xsct:
-        return _program_with_xsct(xsct, bit_path, callback, ps7_tcl)
+        timeout = config.step_timeouts.get("bitstream", 60)
+        return _program_with_xsct(xsct, bit_path, callback, ps7_tcl, timeout)
 
     # Fallback to Vivado
     vivado = _get_vivado_path(config.vitis_path)
@@ -191,6 +188,7 @@ def _program_with_xsct(
     bit_path: Path,
     callback: ProgressCallback = None,
     ps7_init_tcl: str = "",
+    timeout: int = 60,
 ) -> BitstreamResult:
     """Program bitstream using xsct's fpga command.
 
@@ -203,6 +201,7 @@ def _program_with_xsct(
         bit_path: Path to .bit file.
         callback: Optional progress callback.
         ps7_init_tcl: Path to ps7_init.tcl for PS initialization.
+        timeout: Subprocess timeout in seconds.
 
     Returns:
         BitstreamResult with status.
@@ -232,7 +231,7 @@ def _program_with_xsct(
             [xsct_path, tcl_file],
             capture_output=True,
             text=True,
-            timeout=120,
+            timeout=timeout,
         )
         os.unlink(tcl_file)
         success = result.returncode == 0
@@ -351,7 +350,8 @@ def run_elf(
 
     # Auto-detect ps7_init.tcl from config or BIT file directory
     ps7_tcl = _find_ps7_init_tcl(config)
-    return _run_elf_with_xsct(xsct, elf_path, callback, ps7_tcl)
+    timeout = config.step_timeouts.get("elf_download", 60)
+    return _run_elf_with_xsct(xsct, elf_path, callback, ps7_tcl, timeout)
 
 
 def _run_elf_with_xsct(
@@ -359,6 +359,7 @@ def _run_elf_with_xsct(
     elf_path: Path,
     callback: ProgressCallback = None,
     ps7_init_tcl: str = "",
+    timeout: int = 60,
 ) -> BitstreamResult:
     """Download and run ELF using xsct's dow command.
 
@@ -399,7 +400,7 @@ def _run_elf_with_xsct(
             [xsct_path, tcl_file],
             capture_output=True,
             text=True,
-            timeout=120,
+            timeout=timeout,
         )
         os.unlink(tcl_file)
 

src/config_manager.py

@@ -31,6 +31,14 @@ DEFAULT_CONFIG: dict[str, Any] = {
     "ping_count": 3,
     "uart_delay": 3,
     "inter_step_delay": 2,
+    "step_timeouts": {
+        "check_env": 30,
+        "flash_erase": 120,
+        "flash_program": 600,
+        "bitstream": 60,
+        "elf_download": 60,
+        "tftp_reboot": 120,
+    },
 }
 
 
@@ -58,6 +66,7 @@ class Config:
     ping_count: int = 3
     uart_delay: int = 3
     inter_step_delay: int = 2
+    step_timeouts: dict[str, int] = field(default_factory=lambda: {})
 
     # Internal: path to the config file on disk
     _config_path: Path = field(default=None, init=False, repr=False)
@@ -163,6 +172,7 @@ class Config:
             "ping_count": self.ping_count,
             "uart_delay": self.uart_delay,
             "inter_step_delay": self.inter_step_delay,
+            "step_timeouts": self.step_timeouts,
         }
         return data
 

src/flash_programmer.py

@@ -41,31 +41,30 @@ def _run_command(
     timeout: int = 300,
     callback: ProgressCallback = None,
 ) -> subprocess.CompletedProcess[str]:
-    """Run a subprocess command with progress reporting.
+    """Run a subprocess command with real-time streaming output.
+
+    Uses subprocess_utils.run_streaming to stream stdout/stderr in
+    real time, parsing for warnings, errors, and progress.
 
     Args:
         cmd: Command and arguments.
-        timeout: Maximum seconds to wait (flash ops can take minutes).
+        timeout: Maximum seconds.
         callback: Optional callback(status, message).
 
     Returns:
         CompletedProcess result.
     """
+    from subprocess_utils import run_streaming
+
     if callback:
         callback("running", f"Executing: {' '.join(cmd)}")
 
-    result = subprocess.run(
+    try:
-        cmd,
+        return run_streaming(cmd, timeout=timeout, callback=callback)
-        capture_output=True,
+    except subprocess.TimeoutExpired:
-        text=True,
+        if callback:
-        timeout=timeout,
+            callback("error", f"{cmd[0]} timed out after {timeout}s")
-    )
+        raise
-    if callback:
-        if result.returncode == 0:
-            callback("complete", f"{cmd[0]} succeeded")
-        else:
-            callback("error", f"{cmd[0]} failed (exit {result.returncode})")
-    return result
 
 
 def _build_program_flash_cmd_base(
@@ -135,7 +134,7 @@ def wipe_flash(
     cmd += ["-erase_only"]  # Erase sectors matching the BIN size (safer than -erase_all)
 
     try:
-        result = _run_command(cmd, timeout=300, callback=callback)
+        result = _run_command(cmd, timeout=config.step_timeouts.get("flash_erase", 120), callback=callback)
         success = result.returncode == 0
         return FlashResult(
             step="wipe",
@@ -195,7 +194,7 @@ def program_flash_bin(
     ]
 
     try:
-        result = _run_command(cmd, timeout=600, callback=callback)
+        result = _run_command(cmd, timeout=config.step_timeouts.get("flash_program", 600), callback=callback)
         success = result.returncode == 0
         return FlashResult(
             step="program",

src/gui/main_window.py

@@ -24,7 +24,7 @@ from ip_verifier import ping_ip
 from tftp_manager import tftp_upload_verify, TftpResult
 from reboot_manager import reboot_zynq, RebootResult
 from boot_verifier import verify_boot, verify_zynq_status, BootVerificationResult
-from serial_monitor import detect_serial_ports, parse_boot_output, check_uart_available
+from serial_monitor import detect_serial_ports, parse_boot_output, check_uart_available, UartMonitor
 from gui.styles import (
     WINDOW_WIDTH,
     WINDOW_HEIGHT,
@@ -79,6 +79,7 @@ class MainWindow(ctk.CTk):
         self._uart_message: str = ""
         self._zynq_jtag_present: bool = False
         self._zynq_jtag_info = None
+        self._uart_monitor: UartMonitor | None = None
 
         # StringVar references for config sync
         self._ip_string_var: ctk.StringVar | None = None
@@ -961,6 +962,15 @@ class MainWindow(ctk.CTk):
             self._run_step_3_load_bootloader,
             self._run_step_4_load_main_program,
         ]
+        step_timeout_keys = [
+            ("check_env", 30),
+            ("flash_program", 600),
+            ("bitstream", 60),
+            ("tftp_reboot", 120),
+        ]
+
+        # Start UART monitor if available
+        self._start_uart_monitor()
 
         # Determine end index based on single_step flag
         end_index = start_index + 1 if single_step else len(step_funcs)
@@ -970,12 +980,21 @@ class MainWindow(ctk.CTk):
         for i in range(start_index, end_index):
             step_idx = i - start_index
             self._set_step_status(i, "running")
+
+            # Log step timeout estimate
+            timeout_key, default_timeout = step_timeout_keys[i] if i < len(step_timeout_keys) else ("", 30)
+            step_timeout = self._config.step_timeouts.get(timeout_key, default_timeout) if self._config else default_timeout
+            self._log_message(f"  ⏱ Step {i+1} timeout: {step_timeout}s")
+
             self._progress.set_value(step_idx / total)
+            t_step_start = time.time()
 
             try:
                 success = step_funcs[i]()
                 results.append(success)
                 self._set_step_status(i, "complete" if success else "error")
+                elapsed = time.time() - t_step_start
+                self._log_message(f"  ⏱ Step {i+1} completed in {elapsed:.0f}s")
             except Exception as e:
                 results.append(False)
                 self._set_step_status(i, "error")
@@ -1020,6 +1039,35 @@ class MainWindow(ctk.CTk):
         # Save config after running
         self._save_config()
 
+        # Stop UART monitor
+        self._stop_uart_monitor()
+
+    # ── UART Monitor ──────────────────────────────────────────
+
+    def _start_uart_monitor(self) -> None:
+        """Start background serial monitoring if UART is available."""
+        if not self._uart_available or not self._config:
+            return
+        port = self._config.serial_port
+        if not port:
+            return
+
+        self._uart_monitor = UartMonitor(port, self._config.serial_baudrate)
+        self._uart_monitor.on_line = lambda line: self._log_message(f"  [UART] {line}")
+        self._uart_monitor.on_boot_info = lambda info: (
+            self._log_message(f"  [UART] Boot detected: IP={info.ip_address}, Ver={info.version}")
+            if info.ip_address or info.version else None
+        )
+        self._uart_monitor.on_error = lambda e: self._log_message(f"  [UART] Error: {e}")
+        if self._uart_monitor.start():
+            self._log_message("  [UART] Serial monitor started")
+
+    def _stop_uart_monitor(self) -> None:
+        """Stop background serial monitoring."""
+        if self._uart_monitor:
+            self._uart_monitor.stop()
+            self._uart_monitor = None
+
     # ── Serial ─────────────────────────────────────────────────
 
     def _refresh_ports(self) -> None:
@@ -1040,6 +1088,7 @@ class MainWindow(ctk.CTk):
 
     def _on_close(self) -> None:
         """Handle window close event: save config and cleanup."""
+        self._stop_uart_monitor()
         if self._config:
             self._sync_config_from_ui()  # Sync UI values first
             # Save to user config file (config.yaml)

src/serial_monitor.py

@@ -2,11 +2,13 @@
 
 Detects available serial ports, reads output streams, and parses
 boot logs for IP addresses, version strings, and other diagnostic info.
+Provides UartMonitor for continuous background monitoring.
 """
 
 from __future__ import annotations
 
 import re
+import threading
 from dataclasses import dataclass
 from typing import Callable
 
@@ -285,3 +287,156 @@ def _parse_version_from_response(response: str) -> str:
                 return version
 
     return ""
+
+
+# ════════════════════════════════════════════════════════════════════
+# UartMonitor — continuous background serial monitoring
+# ════════════════════════════════════════════════════════════════════
+
+
+class UartMonitor:
+    """Background thread that continuously reads and parses serial output.
+
+    Opens the configured serial port in a daemon thread, reads lines
+    as they arrive, parses them for boot info (IP, version, errors),
+    and invokes callbacks for each event.
+
+    Usage:
+        monitor = UartMonitor("/dev/ttyUSB0", 115200)
+        monitor.on_line = lambda line: print(f"  SERIAL: {line}")
+        monitor.on_boot_info = lambda info: print(f"  BOOT: {info}")
+        monitor.start()
+        ...
+        info = monitor.latest_info  # latest parsed BootInfo
+        monitor.stop()
+    """
+
+    def __init__(
+        self,
+        port: str,
+        baudrate: int = 115200,
+        timeout: float = 1.0,
+    ) -> None:
+        """Initialize the UART monitor.
+
+        Args:
+            port: Serial port device path.
+            baudrate: Baud rate for serial communication.
+            timeout: Read timeout between lines.
+        """
+        self._port = port
+        self._baudrate = baudrate
+        self._timeout = timeout
+        self._thread: threading.Thread | None = None
+        self._stop_event = threading.Event()
+        self._lock = threading.Lock()
+        self._all_lines: list[str] = []
+        self._latest_info = BootInfo(raw_lines=[])
+
+        # Callbacks — set these before calling start()
+        self.on_line: Callable[[str], None] | None = None
+        self.on_boot_info: Callable[[BootInfo], None] | None = None
+        self.on_error: Callable[[str], None] | None = None
+
+    @property
+    def latest_info(self) -> BootInfo:
+        """Return the latest parsed boot information (thread-safe)."""
+        with self._lock:
+            return self._latest_info
+
+    @property
+    def all_lines(self) -> list[str]:
+        """Return all lines read so far (thread-safe)."""
+        with self._lock:
+            return list(self._all_lines)
+
+    def start(self) -> bool:
+        """Start the background monitoring thread.
+
+        Returns:
+            True if started successfully, False if port cannot be opened.
+        """
+        if self._thread and self._thread.is_alive():
+            return True
+
+        # Quick port check before starting thread
+        try:
+            test_ser = serial.Serial(self._port, self._baudrate, timeout=1)
+            test_ser.close()
+        except serial.SerialException as e:
+            if self.on_error:
+                self.on_error(f"UART open failed: {e}")
+            return False
+
+        self._stop_event.clear()
+        self._thread = threading.Thread(target=self._read_loop, daemon=True)
+        self._thread.start()
+        return True
+
+    def stop(self) -> None:
+        """Stop the background monitoring thread."""
+        self._stop_event.set()
+        if self._thread:
+            self._thread.join(timeout=3)
+            self._thread = None
+
+    def is_running(self) -> bool:
+        """Check if the monitor thread is active."""
+        return self._thread is not None and self._thread.is_alive()
+
+    def _read_loop(self) -> None:
+        """Main read loop running in background thread."""
+        try:
+            ser = serial.Serial(
+                self._port,
+                self._baudrate,
+                timeout=self._timeout,
+            )
+            ser.reset_input_buffer()
+        except serial.SerialException as e:
+            if self.on_error:
+                self.on_error(f"UART open failed: {e}")
+            return
+
+        accumulated: list[str] = []
+        try:
+            while not self._stop_event.is_set():
+                try:
+                    if ser.in_waiting:
+                        line_bytes = ser.readline()
+                        try:
+                            line = line_bytes.decode("utf-8", errors="replace").strip()
+                        except Exception:
+                            line = repr(line_bytes)
+                    else:
+                        line = ""
+                except serial.SerialException:
+                    line = ""
+
+                if line:
+                    # Store all lines
+                    with self._lock:
+                        self._all_lines.append(line)
+                    accumulated.append(line)
+
+                    # Invoke line callback
+                    if self.on_line:
+                        self.on_line(line)
+
+                    # Parse boot info from accumulated lines
+                    info = parse_boot_output(accumulated)
+                    with self._lock:
+                        self._latest_info = info
+
+                    # Notify if we have new boot info
+                    if info.boot_message or info.ip_address or info.version:
+                        if self.on_boot_info:
+                            self.on_boot_info(info)
+                else:
+                    # No data, sleep briefly
+                    self._stop_event.wait(0.1)
+        finally:
+            try:
+                ser.close()
+            except Exception:
+                pass

src/subprocess_utils.py

@@ -0,0 +1,150 @@
+"""Non-blocking subprocess execution with real-time output parsing.
+
+Provides run_streaming() which streams stdout/stderr to callbacks
+in real time, parsing for warnings, errors, and progress indicators.
+Used by flash_programmer and bitstream_programmer.
+"""
+
+from __future__ import annotations
+
+import re
+import subprocess
+import threading
+from typing import Callable
+
+
+StreamCallback = Callable[[str, str], None] | None
+"""Callback type: (category, message) where category is one of:
+   'out', 'err', 'warn', 'error', 'progress', 'done'"""
+
+# Regex patterns for parsing tool output
+_WARNING_RE = re.compile(r"WARNING\s*[:\[].*", re.IGNORECASE)
+_ERROR_RE = re.compile(r"ERROR\s*[:\[].*|CRITICAL\s*[:\[].*", re.IGNORECASE)
+_PROGRESS_RE = re.compile(r"(\d{1,3})\s*%")
+_INFO_KEYWORDS = ["connected", "downloading", "running", "initialization",
+                  "verif", "write", "erase", "flash operation"]
+
+
+def run_streaming(
+    cmd: list[str],
+    timeout: int = 300,
+    callback: StreamCallback = None,
+) -> subprocess.CompletedProcess[str]:
+    """Run a command with real-time stdout/stderr streaming and parsing.
+
+    Spawns background threads to read stdout and stderr line-by-line.
+    Each line is parsed for warnings, errors, and progress, and the
+    results are passed to the callback in real time.
+
+    Args:
+        cmd: Command and arguments (e.g., ["program_flash", "-f", ...]).
+        timeout: Maximum seconds before killing the process.
+        callback: Optional callback(category, message).
+
+    Returns:
+        CompletedProcess with stdout, stderr, and returncode.
+    """
+    stdout_lines: list[str] = []
+    stderr_lines: list[str] = []
+
+    def _read_stream(stream, lines: list[str], stream_name: str) -> None:
+        """Read lines from a stream in a background thread."""
+        for raw in iter(stream.readline, ""):
+            line = raw.strip()
+            if not line:
+                continue
+            lines.append(line)
+
+            # Parse and callback
+            if callback:
+                _parse_and_callback(line, stream_name, callback)
+
+    try:
+        proc = subprocess.Popen(
+            cmd,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            text=True,
+            bufsize=1,
+        )
+
+        # Start reader threads
+        t_out = threading.Thread(
+            target=_read_stream,
+            args=(proc.stdout, stdout_lines, "out"),
+            daemon=True,
+        )
+        t_err = threading.Thread(
+            target=_read_stream,
+            args=(proc.stderr, stderr_lines, "err"),
+            daemon=True,
+        )
+        t_out.start()
+        t_err.start()
+
+        # Wait with timeout
+        try:
+            proc.wait(timeout=timeout)
+        except subprocess.TimeoutExpired:
+            proc.kill()
+            if callback:
+                callback("error", f"Command timed out after {timeout}s")
+            raise
+
+        # Wait for reader threads to finish
+        t_out.join(timeout=2)
+        t_err.join(timeout=2)
+
+        if callback:
+            if proc.returncode == 0:
+                callback("done", f"{cmd[0]}: completed successfully")
+            else:
+                callback("error", f"{cmd[0]}: failed (exit {proc.returncode})")
+
+        return subprocess.CompletedProcess(
+            args=cmd,
+            returncode=proc.returncode,
+            stdout="\n".join(stdout_lines),
+            stderr="\n".join(stderr_lines),
+        )
+    except FileNotFoundError:
+        if callback:
+            callback("error", f"Command not found: {cmd[0]}")
+        raise
+
+
+def _parse_and_callback(
+    line: str,
+    stream_name: str,
+    callback: Callable[[str, str], None],
+) -> None:
+    """Parse a single output line and invoke the callback.
+
+    Args:
+        line: Raw output line.
+        stream_name: 'out' or 'err'.
+        callback: Callback to invoke.
+    """
+    # Check for explicit errors/warnings
+    if _ERROR_RE.match(line):
+        callback("error", line)
+        return
+    if _WARNING_RE.match(line):
+        callback("warn", line)
+        return
+
+    # Check for progress percentage
+    m = _PROGRESS_RE.search(line)
+    if m:
+        callback("progress", f"{m.group(1)}%")
+        return
+
+    # Check for info keywords
+    lowered = line.lower()
+    for kw in _INFO_KEYWORDS:
+        if kw in lowered:
+            callback("out", line)
+            return
+
+    # Default: plain output
+    callback(stream_name, line)