325 lines
11 KiB
Python
325 lines
11 KiB
Python
#!/usr/bin/env python3
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"""
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MIPI TEST APPLICATION - MIPI_TEST.PY
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- ENTRY POINT OF APPLICATION
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VERSION: 0.3
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AUTHOR: D. RICE 25/03/2026
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© 2026 ARRIVE
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"""
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import vxi11
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import time
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import sys
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import requests
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import threading
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from datetime import datetime
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# --- Configuration ---
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URL = "http://192.168.45.8:5000/display"
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SCOPE_IP = "192.168.45.4"
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PSU_IP = "192.168.45.3"
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# --- Capture settings ---
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# Pass 1 — signal quality: resolves individual bits at 140 Mbit/s (7.1 ns/bit)
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SIG_SCALE = 2e-9 # 2 ns/div → 20 ns window
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SIG_POINTS = 500_000 # 500 k pts → ~25 GSa/s
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# Pass 2 — protocol/frame structure: shows LP↔HS transitions and burst envelope
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PROTO_SCALE = 1e-6 # 1 µs/div → 10 µs window
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PROTO_POINTS = 500_000 # 500 k pts → 50 MSa/s (enough to see burst structure)
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DISPLAY_SETTLE_S = 1.0 # seconds to wait after display ON before arming scope
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test_running = False # Global flag to control the background thread
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# --- Instrument Connection ---
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try:
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psu = vxi11.Instrument(PSU_IP)
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scope = vxi11.Instrument(SCOPE_IP)
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scope.timeout = 30 # seconds — needs to cover *RST and image saves
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psu.timeout = 5
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except Exception as e:
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print(f"ERROR: CANNOT CONNECT TO INSTRUMENTS: {e}")
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sys.exit(1)
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# ---------------------------------------------------------------------------
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def setup_scope():
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"""Initialises DSO80204B for MIPI DSI signals (~210 MHz)."""
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print("CONFIGURING SCOPE...")
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cmds = [
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# ── Reset & stop ──────────────────────────────────────────────────
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"*RST",
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":RUN",
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":STOP",
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# ── Channel 1 — Clock D+ ─────────────────────────────────────────
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":CHANnel1:DISPlay ON",
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":CHANnel1:INPut DC50",
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":CHANnel1:PROBe 19.2", # 910Ω + 50Ω divider = 19.2:1
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":CHANnel1:SCALe 0.1", # 100 mV/div
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":CHANnel1:OFFSet 0.0",
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":CHANnel1:LABel 'CLK+'",
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# ── Channel 2 — Clock D- ─────────────────────────────────────────
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":CHANnel2:DISPlay ON",
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":CHANnel2:INPut DC50",
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":CHANnel2:PROBe 19.2",
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":CHANnel2:SCALe 0.1",
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":CHANnel2:OFFSet 0.0",
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":CHANnel2:LABel 'CLK-'",
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# ── Channel 3 — Data Lane 0 D+ ───────────────────────────────────
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":CHANnel3:DISPlay ON",
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":CHANnel3:INPut DC50",
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":CHANnel3:PROBe 19.2",
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":CHANnel3:SCALe 0.1",
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":CHANnel3:OFFSet 0.0",
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":CHANnel3:LABel 'DAT0+'",
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# ── Channel 4 — Data Lane 0 D- ───────────────────────────────────
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":CHANnel4:DISPlay ON",
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":CHANnel4:INPut DC50",
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":CHANnel4:PROBe 19.2",
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":CHANnel4:SCALe 0.1",
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":CHANnel4:OFFSet 0.0",
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":CHANnel4:LABel 'DAT0-'",
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# ── Timebase — 5 ns/div shows ~10 cycles of 200 MHz clock ────────
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":TIMebase:SCALe 5E-9",
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":TIMebase:POSition 0",
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":TIMebase:REFerence CENTer",
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# ── Trigger — rising edge on Ch1 (Clock D+) ──────────────────────
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":TRIGger:MODE EDGE",
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":TRIGger:EDGE:SOURce CHANnel1",
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":TRIGger:EDGE:SLOPe POSitive",
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":TRIGger:EDGE:LEVel 0.05", # 50 mV post-attenuation
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":TRIGger:SWEep NORMal",
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# ── Acquisition ───────────────────────────────────────────────────
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":ACQuire:MODE RTIMe",
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":ACQuire:INTerpolate ON",
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":ACQuire:POINts 500000",
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# ── Display ───────────────────────────────────────────────────────
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":DISPlay:LAYout STACKED",
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":RUN",
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]
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for cmd in cmds:
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scope.write(cmd)
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time.sleep(0.05)
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print("CHANNEL SETUP COMPLETE.")
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setup_math_channels()
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def setup_math_channels():
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"""
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F1 = Ch1 - Ch2 (clock differential)
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F2 = Ch3 - Ch4 (lane 0 differential)
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DSO80204B firmware 05.30.0005 confirmed syntax:
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:FUNCtion<n>:DISPlay ON
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:FUNCtion<n>:SUBTract CHANnel<a>,CHANnel<b>
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"""
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print("SETTING UP MATH CHANNELS...")
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scope.write("*CLS")
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time.sleep(0.2)
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math_cmds = [
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# ── F1 = Ch1 - Ch2 (clock differential) ─────────────────────────
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":FUNCtion1:DISPlay ON",
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":FUNCtion1:SUBTract CHANnel1,CHANnel2",
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":FUNCtion1:RANGe 0.8", # 0.8V range = 100mV/div (range = 8 × scale)
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":FUNCtion1:OFFSet 0.0",
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# ── F2 = Ch3 - Ch4 (lane 0 differential) ─────────────────────────
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":FUNCtion2:DISPlay ON",
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":FUNCtion2:SUBTract CHANnel3,CHANnel4",
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":FUNCtion2:RANGe 0.8", # 0.8V range = 100mV/div
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":FUNCtion2:OFFSet 0.0",
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]
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for cmd in math_cmds:
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scope.write(cmd)
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time.sleep(0.2)
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try:
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time.sleep(1.0)
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opc = scope.ask("*OPC?")
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print(f" SCOPE SYNC OK (OPC={opc.strip()})")
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except Exception as e:
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print(f" WARNING: OPC SYNC FAILED ({e})")
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try:
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err = scope.ask(":SYSTem:ERRor?")
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if err.strip().startswith("0"):
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print(" MATH COMMANDS ACCEPTED — NO SCPI ERRORS.")
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print(" F1 = CLK DIFF (CH1-CH2), F2 = DAT DIFF (CH3-CH4)")
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else:
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print(f" SCPI ERROR: {err.strip()}")
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except Exception as e:
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print(f" COULD NOT READ ERROR QUEUE ({e})")
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def _set_timebase(scale, points):
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"""Apply timebase scale and record length, then let the scope settle."""
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scope.write(f":TIMebase:SCALe {scale:.3E}")
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scope.write(f":ACQuire:POINts {points}")
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time.sleep(0.3)
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def _arm_and_wait(timeout=20):
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"""
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Fire a single acquisition using :DIGitize (blocking on Infiniium) and
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confirm completion with *OPC?. Temporarily extends scope.timeout to
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cover the full wait period.
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Returns True on success, False on error/timeout.
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"""
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prev_timeout = scope.timeout
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try:
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scope.timeout = timeout + 5 # headroom over the DIGitize wait
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scope.write(":DIGitize")
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resp = scope.ask("*OPC?").strip()
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return resp == "1"
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except Exception as e:
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print(f" ACQUIRE ERROR: {e}")
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return False
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finally:
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scope.timeout = prev_timeout
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def _save_pass(tag, iteration, ts):
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"""
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Save F1 (CLK diff) and F2 (DAT diff) as CSV, plus a PNG screenshot.
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Files land in C:\\TEMP on the scope's local disk.
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Naming: <YYYYMMDD_HHMMSS>_<tag>_<iter>_clk.csv (date-first for easy sorting/deletion)
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"""
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base = f"C:\\TEMP\\{ts}_{tag}_{iteration:04d}"
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try:
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scope.write(f':DISK:SAVE:WAVeform FUNCtion1,"{base}_clk.csv",CSV')
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time.sleep(2.5)
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scope.write(f':DISK:SAVE:WAVeform FUNCtion2,"{base}_dat.csv",CSV')
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time.sleep(2.5)
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print(f" SAVED: {base}_clk.csv {base}_dat.csv")
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except Exception as e:
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print(f" SAVE ERROR ({tag}): {e}")
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def dual_capture(iteration):
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"""
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Two-pass capture per test iteration:
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Pass 1 — signal quality (SIG_SCALE / SIG_POINTS)
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Pass 2 — frame structure (PROTO_SCALE / PROTO_POINTS)
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Restores the original 5 ns/div timebase when done.
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"""
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ts = datetime.now().strftime("%Y%m%d_%H%M%S")
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print(f"DUAL CAPTURE #{iteration:04d} [{ts}]")
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# ── Pass 1: signal quality ─────────────────────────────────────────────
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print(" PASS 1: SIGNAL QUALITY...")
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_set_timebase(SIG_SCALE, SIG_POINTS)
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if _arm_and_wait():
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_save_pass("sig", iteration, ts)
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else:
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print(" SKIPPING PASS 1 SAVE.")
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# ── Pass 2: frame/protocol structure ──────────────────────────────────
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print(" PASS 2: FRAME STRUCTURE...")
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_set_timebase(PROTO_SCALE, PROTO_POINTS)
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if _arm_and_wait():
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_save_pass("proto", iteration, ts)
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else:
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print(" SKIPPING PASS 2 SAVE.")
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# ── Restore original timebase ─────────────────────────────────────────
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_set_timebase(5e-9, 500_000)
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scope.write(":RUN")
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def test_worker():
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"""
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Background loop:
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- Turns display ON, waits DISPLAY_SETTLE_S for it to stabilise
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- Runs dual_capture (signal quality + frame structure)
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- Turns display OFF for 1 second
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- Repeats until test_running = False
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"""
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global test_running
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count = 1
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while test_running:
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requests.put(URL, json={"state": "on"}, timeout=2)
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time.sleep(DISPLAY_SETTLE_S)
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dual_capture(count)
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count += 1
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requests.put(URL, json={"state": "off"}, timeout=2)
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time.sleep(1.0)
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def main_menu():
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global test_running
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while True:
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print("\n===== MIPI TEST CONTROL =====")
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print("1. RUN IDN CHECK (PSU & SCOPE)")
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print("2. SETUP SCOPE (RUN FIRST)")
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print("3. CONFIGURE PSU (DEFAULT 24V / 1.5A)")
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print("4. PSU OUTPUT ON/OFF (CH1)")
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print("5. START TEST & CAPTURE")
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print("6. STOP TEST")
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print("7. EXIT")
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choice = input("\nSELECT OPTION (1-7): ").strip()
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if choice == '1':
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print(f"PSU : {psu.ask('*IDN?').strip()}")
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print(f"SCOPE: {scope.ask('*IDN?').strip()}")
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elif choice == '2':
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setup_scope()
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elif choice == '3':
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psu.write('CH1:VOLT 24.0')
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psu.write('CH1:CURR 1.5')
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print("PSU CONFIGURED: 24V / 1.5A")
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elif choice == '4':
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state = input("TYPE 'ON' OR 'OFF': ").strip().upper()
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if state in ('ON', 'OFF'):
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psu.write(f'OUTP CH1,{state}')
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print(f"PSU OUTPUT {state}.")
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else:
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print("INVALID — TYPE 'ON' OR 'OFF'.")
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elif choice == '5':
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if not test_running:
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test_running = True
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t = threading.Thread(target=test_worker, daemon=True)
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t.start()
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print("TEST STARTED.")
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else:
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print("TEST IS ALREADY RUNNING!")
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elif choice == '6':
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print("STOPPING TEST...")
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test_running = False
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elif choice == '7':
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test_running = False
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psu.close()
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scope.close()
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print("INSTRUMENTS CLOSED. BYE.")
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break
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else:
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print("INVALID ENTRY. PLEASE CHOOSE 1-7.")
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if __name__ == "__main__":
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main_menu() |