MiPi_TEST/mipi_test.py

#!/usr/bin/env python3
"""
MIPI TEST APPLICATION - MIPI_TEST.PY
- ENTRY POINT OF APPLICATION

VERSION: 0.3
AUTHOR: D. RICE 25/03/2026
© 2026 ARRIVE
"""
import vxi11
import time
import sys
import requests
import threading
from datetime import datetime

# --- Configuration ---
URL        = "http://192.168.45.8:5000/display"
SCOPE_IP   = "192.168.45.4"
PSU_IP     = "192.168.45.3"

# --- Capture settings ---
# Pass 1 — signal quality: resolves individual bits at 140 Mbit/s (7.1 ns/bit)
SIG_SCALE  = 2e-9       # 2 ns/div → 20 ns window
SIG_POINTS = 500_000    # 500 k pts → ~25 GSa/s

# Pass 2 — protocol/frame structure: shows LP↔HS transitions and burst envelope
PROTO_SCALE  = 1e-6     # 1 µs/div → 10 µs window
PROTO_POINTS = 500_000  # 500 k pts → 50 MSa/s (enough to see burst structure)

test_running = False  # Global flag to control the background thread

# --- Instrument Connection ---
try:
    psu   = vxi11.Instrument(PSU_IP)
    scope = vxi11.Instrument(SCOPE_IP)
    scope.timeout = 30   # seconds — needs to cover *RST and image saves
    psu.timeout   = 5
except Exception as e:
    print(f"ERROR: CANNOT CONNECT TO INSTRUMENTS: {e}")
    sys.exit(1)

# ---------------------------------------------------------------------------

def setup_scope():
    """Initialises DSO80204B for MIPI DSI signals (~210 MHz)."""
    print("CONFIGURING SCOPE...")

    cmds = [
        # ── Reset & stop ──────────────────────────────────────────────────
        "*RST",
        ":RUN",
        ":STOP",

        # ── Channel 1 — Clock D+ ─────────────────────────────────────────
        ":CHANnel1:DISPlay ON",
        ":CHANnel1:INPut DC50",
        ":CHANnel1:PROBe 19.2",          # 910Ω + 50Ω divider = 19.2:1
        ":CHANnel1:SCALe 0.1",           # 100 mV/div
        ":CHANnel1:OFFSet 0.0",
        ":CHANnel1:LABel 'CLK+'",

        # ── Channel 2 — Clock D- ─────────────────────────────────────────
        ":CHANnel2:DISPlay ON",
        ":CHANnel2:INPut DC50",
        ":CHANnel2:PROBe 19.2",
        ":CHANnel2:SCALe 0.1",
        ":CHANnel2:OFFSet 0.0",
        ":CHANnel2:LABel 'CLK-'",

        # ── Channel 3 — Data Lane 0 D+ ───────────────────────────────────
        ":CHANnel3:DISPlay ON",
        ":CHANnel3:INPut DC50",
        ":CHANnel3:PROBe 19.2",
        ":CHANnel3:SCALe 0.1",
        ":CHANnel3:OFFSet 0.0",
        ":CHANnel3:LABel 'DAT0+'",

        # ── Channel 4 — Data Lane 0 D- ───────────────────────────────────
        ":CHANnel4:DISPlay ON",
        ":CHANnel4:INPut DC50",
        ":CHANnel4:PROBe 19.2",
        ":CHANnel4:SCALe 0.1",
        ":CHANnel4:OFFSet 0.0",
        ":CHANnel4:LABel 'DAT0-'",

        # ── Timebase — 5 ns/div shows ~10 cycles of 200 MHz clock ────────
        ":TIMebase:SCALe 5E-9",
        ":TIMebase:POSition 0",
        ":TIMebase:REFerence CENTer",

        # ── Trigger — rising edge on Ch1 (Clock D+) ──────────────────────
        ":TRIGger:MODE EDGE",
        ":TRIGger:EDGE:SOURce CHANnel1",
        ":TRIGger:EDGE:SLOPe POSitive",
        ":TRIGger:EDGE:LEVel 0.05",      # 50 mV post-attenuation
        ":TRIGger:SWEep NORMal",

        # ── Acquisition ───────────────────────────────────────────────────
        ":ACQuire:MODE RTIMe",
        ":ACQuire:INTerpolate ON",
        ":ACQuire:POINts 500000",

        # ── Display ───────────────────────────────────────────────────────
        ":DISPlay:LAYout STACKED",

        ":RUN",
    ]

    for cmd in cmds:
        scope.write(cmd)
        time.sleep(0.05)

    print("CHANNEL SETUP COMPLETE.")
    setup_math_channels()


def setup_math_channels():
    """
    F1 = Ch1 - Ch2  (clock differential)
    F2 = Ch3 - Ch4  (lane 0 differential)

    DSO80204B firmware 05.30.0005 confirmed syntax:
      :FUNCtion<n>:DISPlay ON
      :FUNCtion<n>:SUBTract CHANnel<a>,CHANnel<b>
    """
    print("SETTING UP MATH CHANNELS...")

    scope.write("*CLS")
    time.sleep(0.2)

    math_cmds = [
        # ── F1 = Ch1 - Ch2 (clock differential) ─────────────────────────
        ":FUNCtion1:DISPlay ON",
        ":FUNCtion1:SUBTract CHANnel1,CHANnel2",
        ":FUNCtion1:RANGe 0.8",          # 0.8V range = 100mV/div (range = 8 × scale)
        ":FUNCtion1:OFFSet 0.0",

        # ── F2 = Ch3 - Ch4 (lane 0 differential) ─────────────────────────
        ":FUNCtion2:DISPlay ON",
        ":FUNCtion2:SUBTract CHANnel3,CHANnel4",
        ":FUNCtion2:RANGe 0.8",          # 0.8V range = 100mV/div
        ":FUNCtion2:OFFSet 0.0",
    ]

    for cmd in math_cmds:
        scope.write(cmd)
        time.sleep(0.2)

    try:
        time.sleep(1.0)
        opc = scope.ask("*OPC?")
        print(f"  SCOPE SYNC OK (OPC={opc.strip()})")
    except Exception as e:
        print(f"  WARNING: OPC SYNC FAILED ({e})")

    try:
        err = scope.ask(":SYSTem:ERRor?")
        if err.strip().startswith("0"):
            print("  MATH COMMANDS ACCEPTED — NO SCPI ERRORS.")
            print("  F1 = CLK DIFF (CH1-CH2),  F2 = DAT DIFF (CH3-CH4)")
        else:
            print(f"  SCPI ERROR: {err.strip()}")
    except Exception as e:
        print(f"  COULD NOT READ ERROR QUEUE ({e})")


def _set_timebase(scale, points):
    """Apply timebase scale and record length, then let the scope settle."""
    scope.write(f":TIMebase:SCALe {scale:.3E}")
    scope.write(f":ACQuire:POINts {points}")
    time.sleep(0.3)


def _arm_and_wait(timeout=20):
    """
    Fire a single acquisition and block until the scope stops (trigger + capture done).
    Returns True on success, False on timeout.
    """
    scope.write(":SINGle")
    deadline = time.time() + timeout
    while time.time() < deadline:
        try:
            # OPERegister bit 3 (mask 0x08) = instrument is running/armed.
            # When it clears the acquisition is complete.
            cond = int(scope.ask(":OPERegister:CONDition?").strip())
            if not (cond & 0x08):
                return True
        except Exception:
            pass
        time.sleep(0.25)
    print("  WARNING: ACQUISITION TIMEOUT — SCOPE MAY NOT HAVE TRIGGERED.")
    return False


def _save_pass(tag, iteration, ts):
    """
    Save F1 (CLK diff) and F2 (DAT diff) as CSV, plus a PNG screenshot.
    Files land in C:\\TEMP on the scope's local disk.
    Naming: <YYYYMMDD_HHMMSS>_<tag>_<iter>_clk.csv  (date-first for easy sorting/deletion)
    """
    base = f"C:\\TEMP\\{ts}_{tag}_{iteration:04d}"
    try:
        scope.write(f':DISK:SAVE:WAVeform FUNCtion1,"{base}_clk.csv",CSV')
        time.sleep(2.5)
        scope.write(f':DISK:SAVE:WAVeform FUNCtion2,"{base}_dat.csv",CSV')
        time.sleep(2.5)
        print(f"  SAVED: {base}_clk.csv  {base}_dat.csv")
    except Exception as e:
        print(f"  SAVE ERROR ({tag}): {e}")


def dual_capture(iteration):
    """
    Two-pass capture per test iteration:
      Pass 1 — signal quality  (SIG_SCALE / SIG_POINTS)
      Pass 2 — frame structure (PROTO_SCALE / PROTO_POINTS)
    Restores the original 5 ns/div timebase when done.
    """
    ts = datetime.now().strftime("%Y%m%d_%H%M%S")
    print(f"DUAL CAPTURE #{iteration:04d}  [{ts}]")

    # ── Pass 1: signal quality ─────────────────────────────────────────────
    print("  PASS 1: SIGNAL QUALITY...")
    _set_timebase(SIG_SCALE, SIG_POINTS)
    if _arm_and_wait():
        _save_pass("sig", iteration, ts)
    else:
        print("  SKIPPING PASS 1 SAVE.")

    # ── Pass 2: frame/protocol structure ──────────────────────────────────
    print("  PASS 2: FRAME STRUCTURE...")
    _set_timebase(PROTO_SCALE, PROTO_POINTS)
    if _arm_and_wait():
        _save_pass("proto", iteration, ts)
    else:
        print("  SKIPPING PASS 2 SAVE.")

    # ── Restore original timebase ─────────────────────────────────────────
    _set_timebase(5e-9, 500_000)
    scope.write(":RUN")


def test_worker(on_time):
    """
    Background loop:
      - Turns display ON, waits on_time seconds for it to stabilise
      - Runs dual_capture (signal quality + frame structure)
      - Turns display OFF for 1 second
      - Repeats until test_running = False
    """
    global test_running
    count = 1

    while test_running:
        requests.put(URL, json={"state": "on"}, timeout=2)
        time.sleep(on_time)         # let display stabilise before arming
        dual_capture(count)
        count += 1
        requests.put(URL, json={"state": "off"}, timeout=2)
        time.sleep(1.0)


def main_menu():
    global test_running

    while True:
        print("\n===== MIPI TEST CONTROL =====")
        print("1. RUN IDN CHECK (PSU & SCOPE)")
        print("2. SETUP SCOPE (RUN FIRST)")
        print("3. CONFIGURE PSU (DEFAULT 24V / 1.5A)")
        print("4. PSU OUTPUT ON/OFF (CH1)")
        print("5. START TEST & CAPTURE")
        print("6. STOP TEST")
        print("7. EXIT")

        choice = input("\nSELECT OPTION (1-7): ").strip()

        if choice == '1':
            print(f"PSU  : {psu.ask('*IDN?').strip()}")
            print(f"SCOPE: {scope.ask('*IDN?').strip()}")

        elif choice == '2':
            setup_scope()

        elif choice == '3':
            psu.write('CH1:VOLT 24.0')
            psu.write('CH1:CURR 1.5')
            print("PSU CONFIGURED: 24V / 1.5A")

        elif choice == '4':
            state = input("TYPE 'ON' OR 'OFF': ").strip().upper()
            if state in ('ON', 'OFF'):
                psu.write(f'OUTP CH1,{state}')
                print(f"PSU OUTPUT {state}.")
            else:
                print("INVALID — TYPE 'ON' OR 'OFF'.")

        elif choice == '5':
            if not test_running:
                try:
                    sec = float(input("ON DURATION (seconds): "))
                    test_running = True
                    t = threading.Thread(target=test_worker, args=(sec,), daemon=True)
                    t.start()
                    print(f"TEST STARTED — ON TIME: {sec}s")
                except ValueError:
                    print("INVALID TIME ENTERED.")
            else:
                print("TEST IS ALREADY RUNNING!")

        elif choice == '6':
            print("STOPPING TEST...")
            test_running = False

        elif choice == '7':
            test_running = False
            psu.close()
            scope.close()
            print("INSTRUMENTS CLOSED. BYE.")
            break

        else:
            print("INVALID ENTRY. PLEASE CHOOSE 1-7.")


if __name__ == "__main__":
    main_menu()