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Prove the corner rolloff; document the one-press recorder

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The stream harness gains rule 20: under M4 with the curve in force, the
accelerate-in head of a line renders less density at the default gamma
of 2 than at gamma 1 (0.317 against 0.537 on the host grid) while the
cruise middle renders identically - the exponent shapes only the
velocity-scaled rolloff, never the programmed level. The panel-serves
covers widen to the whole recorder (src/curverec.*). BRINGUP describes
the rolloff and the one-press recorder; the MOTION table gains
laser_corner_gamma; the panel help explains the knob.
This commit is contained in:
ScottW514
2026-08-30 21:48:32 -04:00
parent 5787260a3d
commit 58cad9a8d8
4 changed files with 54 additions and 6 deletions
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scripts/bench/laser_stream_test.py
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@@ -68,6 +68,11 @@ over TCP, then checks the dumps against the kernel feeder contract:
near 80 percent density), monotonic, floored and ceiled by
$35/$36; every other session runs with laser_dose_curve = off so
its S-to-level arithmetic stays exact
20. the corner rolloff starves the slow spots: under M4 with the curve
in force, the accelerate-in head of a line renders less density at
the default gamma of 2 than at gamma 1, and the cruise middle
renders the same - the exponent shapes only the velocity-scaled
rolloff, never the programmed level
The analog sessions select the reference mode through the config; on
hardware the controller ignores it (density is the only product model -
@@ -861,6 +866,41 @@ def main():
"ladder renders through the %g %% floor key, levels %s"
% (PWM_MIN_PCT, list(expect_levels)))
# --- rule 20: the corner rolloff starves the accel head -------------
# One long M4 line from rest under the curve, at gamma 1 and the
# default 2. The accelerate-in head runs velocity-scaled; its
# rendered density must drop with the exponent while the cruise
# middle stays put.
# F6000 = 100 mm/s: the accel from rest lasts ~143 ms (~4000 ticks),
# so the first 2000 ticks are genuinely velocity-scaled.
JOB_M4_LONG = ["G91", "G21", "M4 S1000", "G1 X60 F6000", "M5"]
head_ticks = 2000
dens_head = {}
dens_mid = {}
for gname, gconf in (("g1", "laser_corner_gamma = 1\n"), ("g2", "")):
data = run_session("rolloff-" + gname, JOB_M4_LONG,
conf=DENSITY_CONF_CURVED + gconf)
ticks = tick_bytes(data)
spans = fire_spans(ticks)
if len(spans) != 1:
fail("[rolloff-%s] %d fire spans, expected 1" % (gname, len(spans)))
a, b = spans[0]
seg = ticks[a:b]
head = seg[:head_ticks]
mid_a = len(seg) // 2 - 2000
mid = seg[mid_a:mid_a + 4000]
dens_head[gname] = sum(1 for t in head if t & 0x10) / float(len(head))
dens_mid[gname] = sum(1 for t in mid if t & 0x10) / float(len(mid))
if not dens_head["g2"] < dens_head["g1"] - 0.02:
fail("[rolloff] gamma 2 does not starve the accel head (g1 %.3f, g2 %.3f)"
% (dens_head["g1"], dens_head["g2"]))
if abs(dens_mid["g2"] - dens_mid["g1"]) > 0.02:
fail("[rolloff] gamma changed the cruise density (g1 %.3f, g2 %.3f): it "
"must shape only the rolloff" % (dens_mid["g1"], dens_mid["g2"]))
print("PASS [rolloff]: accel-head density %.3f at gamma 1 -> %.3f at the "
"default 2; cruise %.3f alike" % (dens_head["g1"], dens_head["g2"],
dens_mid["g1"]))
# --- rule 19: the dose curve bends S onto delivered light -----------
cur = run_session("curve", JOB_CURVE, conf=DENSITY_CONF_CURVED)
if "curve bench-default" not in run_session.text: