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This commit is contained in:
david rice
2026-04-27 13:58:09 +01:00
parent a1b66906e9
commit 2892ea45ff
2 changed files with 115 additions and 6 deletions
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88
device_server.py
View File

@@ -53,10 +53,63 @@ _settling_log: list = []
_settling_lock: threading.Lock = threading.Lock()
# SN65DSI83 configuration registers to snapshot at start and end of each settling window.
# Grouped by purpose so a reset-to-default is obvious at a glance.
# Register address → human-readable name.
_SN65_SNAPSHOT_REGS: dict[int, str] = {
# Core enable / PLL
0x09: "CLK_SRC", # DSI clock source / PLL pre-divider
0x0A: "PLL_STATUS", # PLL_EN_STAT (bit7) + CHA_CLK_DET (bit3) [status]
0x0D: "PLL_EN", # bit0 = PLL enable; should be 0x01 when running
# DSI receiver config
0x10: "DSI_LANES", # CHA_DSI_DATA_EQ_SEL + lane count
0x11: "DSI_CLK_RANGE", # DSI byte-clock frequency range
0x12: "LVDS_CLK_RANGE", # LVDS output clock range
# Active area
0x18: "HACT_LOW", # CHA active line length, low byte
0x19: "HACT_HIGH", # CHA active line length, high byte
0x1A: "VACT_LOW", # CHA vertical display size, low byte
0x1B: "VACT_HIGH", # CHA vertical display size, high byte
# Sync timing
0x20: "SYNC_DLY_LOW", # CHA sync delay, low byte
0x21: "SYNC_DLY_HIGH", # CHA sync delay, high byte
0x22: "HSYNC_W_LOW", # CHA HSYNC pulse width, low byte
0x23: "HSYNC_W_HIGH", # CHA HSYNC pulse width, high byte
0x24: "VSYNC_W_LOW", # CHA VSYNC pulse width, low byte
0x25: "VSYNC_W_HIGH", # CHA VSYNC pulse width, high byte
0x26: "HBP", # CHA horizontal back porch
0x28: "VBP", # CHA vertical back porch
0x2A: "HFP", # CHA horizontal front porch
0x2C: "VFP", # CHA vertical front porch
# Format / output
0x2D: "TEST_PATTERN", # bit0 = enable colour bar test pattern
0x3C: "LVDS_FORMAT", # LVDS output format (colour depth, channel swap)
# Live LVDS line counter — changes every frame when bridge is actively outputting
0xE0: "LINE_CNT_LOW", # CHA line count, low byte [live]
0xE1: "LINE_CNT_HIGH", # CHA line count, high byte [live]
# Error flags
0xE5: "CHA_ERR", # DSI error flags [status]
}
def _sn65_snapshot() -> dict:
"""Read all _SN65_SNAPSHOT_REGS in one pass. Returns {reg_hex: value_hex|None}."""
result = {}
for reg, name in _SN65_SNAPSHOT_REGS.items():
val, _ = _i2c_read_byte(SN65_I2C_BUS, SN65_I2C_ADDR, reg)
result[f"0x{reg:02x}"] = {"name": name, "value": f"0x{val:02x}" if val is not None else None}
return result
def _run_settling_poll() -> None:
"""Poll SN65DSI83 csr_0a + csr_e5 at 10 ms intervals for 1.5 s after restart."""
"""Poll SN65DSI83 csr_0a + csr_e5 at ~10 ms intervals for 1.5 s after restart.
Also takes a full configuration register snapshot at t=0 and t=end so callers
can detect bridge re-initialisation or configuration loss."""
t_start = time.time()
t_end = t_start + SETTLING_DURATION_S
snapshot_start = _sn65_snapshot()
readings: list = []
while time.time() < t_end:
t_ms = round((time.time() - t_start) * 1000, 1)
@@ -71,9 +124,18 @@ def _run_settling_poll() -> None:
"any_error": bool(val_e5) if val_e5 is not None else None,
})
time.sleep(SETTLING_INTERVAL_S)
snapshot_end = _sn65_snapshot()
with _settling_lock:
_settling_log.clear()
_settling_log.extend(readings)
_settling_extra["snapshot_start"] = snapshot_start
_settling_extra["snapshot_end"] = snapshot_end
# Stores the two register snapshots from the most recent settling poll.
_settling_extra: dict = {}
# Known Samsung DSIM register names (base 0x32E10000, i.MX 8M Mini)
_DSIM_NAMES = {
@@ -220,15 +282,37 @@ def _i2c_read_byte(bus: int, addr: int, reg: int) -> tuple[int | None, str]:
@app.route("/sn65_settling", methods=["GET"])
def get_sn65_settling():
"""Return the most recent post-restart settling poll (csr_0a + csr_e5 over 1.5 s)."""
"""Return the most recent post-restart settling poll.
Includes:
snapshot_start — full register dump taken immediately before polling begins
snapshot_end — full register dump taken immediately after polling ends
readings — csr_0a + csr_e5 sampled every ~10 ms during the window
"""
with _settling_lock:
readings = list(_settling_log)
snap_start = dict(_settling_extra.get("snapshot_start") or {})
snap_end = dict(_settling_extra.get("snapshot_end") or {})
error_readings = [r for r in readings if r.get("any_error")]
# Diff the two snapshots so the caller can immediately see what changed.
changed = {}
for reg, info_s in snap_start.items():
info_e = snap_end.get(reg, {})
v_s = info_s.get("value")
v_e = info_e.get("value")
if v_s != v_e:
changed[reg] = {"name": info_s.get("name"), "start": v_s, "end": v_e}
return jsonify({
"n_readings": len(readings),
"n_error": len(error_readings),
"duration_s": SETTLING_DURATION_S,
"interval_ms": int(SETTLING_INTERVAL_S * 1000),
"snapshot_start": snap_start,
"snapshot_end": snap_end,
"changed_regs": changed,
"readings": readings,
}), 200

31
mipi_test_interactive.py
View File

@@ -646,7 +646,7 @@ def _fetch_registers(ts: str, iteration: int) -> None:
print(f" REGISTERS: SN65DSI83 error — {e}")
combined["sn65"] = None
# SN65DSI83 post-restart settling poll
# SN65DSI83 post-restart settling poll + register snapshots
try:
resp = requests.get(f"{DEVICE_BASE}/sn65_settling", timeout=10)
resp.raise_for_status()
@@ -656,13 +656,14 @@ def _fetch_registers(ts: str, iteration: int) -> None:
n = settling.get("n_readings", 0)
n_err = settling.get("n_error", 0)
dur = settling.get("duration_s", 0)
# ── csr_e5 error summary ──────────────────────────────────────────
if n_err:
# Print the first and last error readings for quick diagnosis
err_readings = [r for r in settling.get("readings", []) if r.get("any_error")]
times = [r["t_ms"] for r in err_readings]
print(f" SN65 SETTLING: *** {n_err}/{n} readings had csr_e5 errors "
f"over {dur:.1f} s (t={times[0]:.0f}–{times[-1]:.0f} ms) ***")
for r in err_readings[:3]: # show up to first 3 error readings
for r in err_readings[:3]:
print(f" t={r['t_ms']:6.1f} ms csr_0a={r['csr_0a']} "
f"csr_e5={r['csr_e5']} "
f"pll={'Y' if r['pll_lock'] else 'N'} "
@@ -672,6 +673,30 @@ def _fetch_registers(ts: str, iteration: int) -> None:
if r.get("clk_det") is False)
print(f" SN65 SETTLING: no csr_e5 errors in {n} readings over {dur:.1f} s"
+ (f" ({clk_false} readings with clk_det=False)" if clk_false else ""))
# ── Register snapshot: print start values and flag any changes ───
snap_start = settling.get("snapshot_start") or {}
snap_end = settling.get("snapshot_end") or {}
changed = settling.get("changed_regs") or {}
if snap_start:
print(f" SN65 REGS (t=0):", end="")
# Print a compact one-liner of key config registers
_key = ["0x0d", "0x10", "0x11", "0x18", "0x19", "0x1a", "0x1b",
"0x3c", "0xe0", "0xe1"]
parts = []
for r in _key:
info = snap_start.get(r, {})
parts.append(f"{info.get('name','?')}={info.get('value','?')}")
print(" " + " ".join(parts))
if changed:
print(f" SN65 REGS CHANGED during settling window ({len(changed)} registers):")
for reg, diff in changed.items():
print(f" {reg} {diff['name']:16s} {diff['start']} → {diff['end']}")
elif snap_start:
print(f" SN65 REGS: stable (no register changes between t=0 and t={dur:.1f}s)")
except requests.exceptions.RequestException as e:
print(f" REGISTERS: settling poll fetch failed — {e}")
combined["sn65_settling"] = None