TASK_ID = RF001A_VERIFY_AND_CAPTURE_001
TASK_TITLE = Verify RF-001A common clock and start IQ capture
SOURCE_BRANCH = video-development
EXPECTED_HEAD = fa370ccfa23dedc633346d688547e9c1c77ff8eb
REQUIRES_APPROVAL = YES
HARDWARE_ACCESS = YES
RF_RX = YES
RF_TX = NO
ALLOW_COMMIT = NO
ALLOW_PUSH = RX_RESULT_ONLY
RISK_LEVEL = YELLOW

This file is the authoritative current task for the RX laptop.
The RX assistant must read RX_NODE_STATE.md first, then execute this file.
If chat history conflicts with these files and current Git HEAD, stop and report the conflict.

# Current RX task

TASK =
VERIFY RF-001A COMMON CLOCK AND START IQ CAPTURE

This is one combined YELLOW task. One explicit `[A] Approve` authorizes the bounded CLKIN verification, the bounded short RX-start and, only after that gate passes, the finite 20-second RX capture. Do not request a second approval between those steps.

Do not reuse the approval, state or completion record from either old task ID:

```text
RF001A_CLKIN_001
RF001A_CAPTURE_001
```

## 1. Preconditions

After approval, run `git pull --ff-only origin video-development`, then verify:

- branch = `video-development`;
- `git status --short --untracked-files=no` produces no output;
- local HEAD equals `origin/video-development` and `EXPECTED_HEAD` is its ancestor;
- `hackrf_info` = PASS;
- RX serial = `000000000000000097c063dc2e5327d3`;
- the physical cable is connected from MASTER CLKOUT to SLAVE CLKIN;
- the existing hardware-independent shared RF-001A spec test passes:

```powershell
python -B -m pytest tests/test_rf001a_prepare.py -q -p no:cacheprovider --basetemp .local/pytest-rf001a-verify-capture
```

If any precondition fails, do not start the short RX or the 20-second capture. Report the failed condition, keep `RF TX = 0`, and STOP.

## 2. Verify SLAVE CLKIN before RX

Run the official read-only partner-side check with the explicit RX serial and preserve its complete stdout:

```powershell
& '<verified hackrf_clock.exe path>' -d 000000000000000097c063dc2e5327d3 -i
```

Accept only the exact line:

```text
CLKIN status: clock signal detected
```

Set `SLAVE CLKIN BEFORE RX = DETECTED` only when that line is present. Otherwise set `COMMON CLOCK VERIFIED = NO`, do not start the short RX or capture, keep `RF TX = 0`, and STOP.

## 3. Bounded short RX-start

If SLAVE CLKIN was detected, perform one short, finite RX-start on the same device:

```powershell
& '<verified hackrf_transfer.exe path>' -d 000000000000000097c063dc2e5327d3 -r NUL -f 1400000000 -s 8000000 -n 65536 -l 0 -g 0 -a 0 -p 0 -B
```

This is RX only. It must not transmit. Require:

- exit code = `0`;
- exactly `65536` complex samples transferred;
- RX overruns = `0`;
- USB errors = `0`;
- file write errors = `0`.

If any condition fails, set `SHORT RX START = FAIL` and `COMMON CLOCK VERIFIED = NO`. Do not start the 20-second capture. Keep `RF TX = 0` and STOP.

## 4. Verify SLAVE CLKIN after RX

Immediately repeat the same read-only check and preserve its complete stdout:

```powershell
& '<verified hackrf_clock.exe path>' -d 000000000000000097c063dc2e5327d3 -i
```

Accept only the exact line `CLKIN status: clock signal detected`.

Set `COMMON CLOCK VERIFIED = YES` only when all three conditions pass:

- `SLAVE CLKIN BEFORE RX = DETECTED`;
- `SHORT RX START = PASS`;
- `SLAVE CLKIN AFTER RX = DETECTED`.

If CLKIN is not detected after the short RX-start, set `COMMON CLOCK VERIFIED = NO`, do not start the capture, keep `RF TX = 0`, and STOP. Do not alter clock configuration automatically.

## 5. Authorized finite RX capture

When and only when `COMMON CLOCK VERIFIED = YES`, continue immediately under this same task ID and the same YELLOW approval. Start this finite RX capture:

```text
RX serial = 000000000000000097c063dc2e5327d3
center frequency = 1400000000 Hz
sample rate = 8000000 samples/s
RX LNA = 24 dB
RX VGA = 24 dB
RF amp = OFF
antenna bias = OFF
duration = 20 s
sample count = 160000000 complex samples
hardware format = cs8
expected file size = 320000000 bytes
```

Create a new directory outside the Git checkout for every attempt. Use a timestamp plus a random suffix, refuse an existing path, and never overwrite an earlier capture. Keep the IQ file, stdout, stderr and metadata there. Do not add them to Git.

The required capture arguments are:

```text
hackrf_transfer.exe
-d 000000000000000097c063dc2e5327d3
-r <unique_capture_path>\rf001a_capture.cs8
-f 1400000000
-s 8000000
-n 160000000
-l 24
-g 24
-a 0
-p 0
-B
```

## 6. Controlled background start

Keep one PowerShell session open for the start and completion sequence. Resolve the verified local path to `hackrf_transfer.exe`, then start the controlled background process:

```powershell
$runId = '{0}_{1}' -f (Get-Date -Format 'yyyyMMdd_HHmmss'), ([guid]::NewGuid().ToString('N').Substring(0, 8))
$captureRoot = Join-Path ([Environment]::GetFolderPath('MyDocuments')) 'SDR_Rover_Captures'
$captureDirectory = Join-Path $captureRoot "RF001A_VERIFY_AND_CAPTURE_001_$runId"
if (Test-Path -LiteralPath $captureDirectory) { throw "Capture directory already exists: $captureDirectory" }
New-Item -ItemType Directory -Path $captureDirectory -ErrorAction Stop | Out-Null

$capturePath = Join-Path $captureDirectory 'rf001a_capture.cs8'
$stdoutPath = Join-Path $captureDirectory 'hackrf_transfer.stdout.log'
$stderrPath = Join-Path $captureDirectory 'hackrf_transfer.stderr.log'
$hackrfTransfer = '<verified absolute path to hackrf_transfer.exe>'
$startedAt = Get-Date
$captureArguments = @(
    '-d', '000000000000000097c063dc2e5327d3',
    '-r', $capturePath,
    '-f', '1400000000',
    '-s', '8000000',
    '-n', '160000000',
    '-l', '24',
    '-g', '24',
    '-a', '0',
    '-p', '0',
    '-B'
)
$captureProcess = Start-Process -FilePath $hackrfTransfer -ArgumentList $captureArguments `
    -RedirectStandardOutput $stdoutPath -RedirectStandardError $stderrPath `
    -PassThru -WindowStyle Hidden

$growthDeadline = (Get-Date).AddSeconds(2)
do {
    Start-Sleep -Milliseconds 100
    $captureProcess.Refresh()
    $captureBytes = if (Test-Path -LiteralPath $capturePath) {
        (Get-Item -LiteralPath $capturePath).Length
    } else {
        0
    }
} until ($captureProcess.HasExited -or $captureBytes -gt 0 -or (Get-Date) -ge $growthDeadline)
```

The start passes only if the process remains active and the capture file exists and has grown above zero bytes. If either check fails, report `RX CAPTURE STARTED = NO`, `RX READY FOR TX = NO`, preserve the logs, keep `RF TX = 0`, and STOP.

When both checks pass, immediately output:

```text
TASK_ID =
RF001A_VERIFY_AND_CAPTURE_001

COMMON CLOCK VERIFIED =
YES

RX CAPTURE STARTED =
YES

RX READY FOR TX =
YES

CAPTURE PID =

CAPTURE PATH =

RF TX =
0
```

Do not wait for capture completion, calculate SHA256, or perform another slow action before sending this status. `RX READY FOR TX = YES` only reports that the RX capture is active. It does not authorize RF TX on either computer. RF TX on the RX laptop remains forbidden.

## 7. Capture completion

Only after sending the immediate start status, wait for the same process in the same PowerShell session:

```powershell
$captureProcess.WaitForExit()
$finishedAt = Get-Date
$captureProcess.Refresh()
$exitCode = $captureProcess.ExitCode
$captureSize = (Get-Item -LiteralPath $capturePath).Length
$captureDurationSeconds = ($finishedAt - $startedAt).TotalSeconds
$captureHash = (Get-FileHash -LiteralPath $capturePath -Algorithm SHA256).Hash.ToLowerInvariant()
```

Inspect the saved stdout and stderr. Record the exit code, actual file size, actual duration, RX overruns, USB errors, file write errors and raw IQ SHA256.

The capture is complete only if:

- exit code = `0`;
- file size = exactly `320000000` bytes;
- RX overruns = `0`;
- USB errors = `0`;
- file write errors = `0`.

A smaller file is incomplete. Preserve the evidence and do not retry automatically. Write machine-readable metadata to a new file in `$captureDirectory`, including the task ID, RX serial, requested settings, clock results, PID, timestamps, exit code, size, duration, error counts and SHA256. The metadata and logs remain outside Git.

Finish with:

```text
TASK_ID =
RF001A_VERIFY_AND_CAPTURE_001

SLAVE CLKIN BEFORE RX =
DETECTED / NOT_DETECTED

SHORT RX START =
PASS / FAIL / NOT_RUN

SLAVE CLKIN AFTER RX =
DETECTED / NOT_DETECTED / NOT_RUN

COMMON CLOCK VERIFIED =
YES / NO

RX CAPTURE STARTED =
YES / NO

RX READY FOR TX =
YES / NO

CAPTURE PID =

CAPTURE PATH =

RX CAPTURE COMPLETE =
YES / NO / NOT_RUN

CAPTURE SIZE =

CAPTURE DURATION =

RX OVERRUNS =

USB ERRORS =

FILE WRITE ERRORS =

RAW IQ SHA256 =

RF TX =
0

STOP.
```

## 8. Prohibited actions

On the RX laptop, do not perform RF TX, firmware or CPLD updates, Zadig operations, USB driver changes, clock reconfiguration, continuous RX, automatic retries, commits to `video-development`, or pushes to `video-development`.

`ALLOW_PUSH = RX_RESULT_ONLY` permits only a separately approved small result publication under the handoff protocol. It does not permit raw IQ, large logs, a commit to `video-development`, or a push to `video-development`.