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https://github.com/openglow-org/forgefirm.git
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ScottW514
2907072f0b
fire_test.py phases A/B with the scope on the PSU LASER_ON pin, power byte 0 throughout, HV unpowered, operator-executed unlock: latch LOCKED severs FIRE entirely (pin flat + kernel laser_enable 0 under 40k streamed fire bits); latch unlocked with the chain unarmed shows FIRE live kernel-side while the PSU pin stays flat - the factory board gates LASER_ON behind OK_2_FIRE exactly like the OpenGlow AND design. interlock_circuit semantics pinned by the 13-to-7 transition: b0 LASER_ON monitor active low, b1 FIRE active high, b3 latch 1=locked. The 1-tick FIRE drop measurement is deferred (SoC net inaccessible; PSU pin needs an armed chain) - documented with both closure paths.
103 lines
3.2 KiB
Python
103 lines
3.2 KiB
Python
#!/usr/bin/env python3
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"""FIRE-line drop-timing test - runs ON the board. Usage: fire_test.py A|B
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Stream: power(0) first byte (duty forced to ZERO before any FIRE bit -
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the run-start reset would otherwise leave it at 100%), then
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1 s pads / 2.000 s FIRE bits / 1 s pads / 2.000 s FIRE bits ending
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exactly at end-of-data (the backstop edge the gate wants timed).
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No step bytes; motor_lock=15; streaming=0 (normal completion).
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Phase A: laser latch LOCKED - expects nothing on the LASER_ON pin.
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Phase B: latch UNLOCKED for the run (re-locked in finally). Refuses to
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run if laser_pgood reports the HV supply good. Duty is zero throughout.
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"""
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import fcntl, os, struct, sys, time
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TICK_HZ = 10000
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FIRE = b'\x10'
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PAD = b'\x00'
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def wr(attr, val):
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with open('/sys/glowforge/' + attr, 'w') as f:
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f.write(str(val))
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def rd(attr):
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with open('/sys/glowforge/' + attr) as f:
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return f.read().strip()
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def rd_pos():
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with open('/sys/glowforge/cnc/position', 'rb') as f:
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raw = f.read(32)
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return struct.unpack('<5i', raw[:20])
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def snap(tag):
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print('%s: state=%s laser_enable=%s laser_on=%s laser_on_sampled=%s interlock=%s'
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% (tag, rd('cnc/state'), rd('cnc/laser_enable'), rd('cnc/laser_on'),
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rd('cnc/laser_on_sampled'), rd('cnc/interlock_circuit')))
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mode = sys.argv[1].upper() if len(sys.argv) > 1 else 'A'
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stream = (
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bytes([0x80]) + # power = 0: duty zero before any FIRE bit
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PAD * TICK_HZ + # 1 s baseline
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FIRE * (2 * TICK_HZ) + # 2.000 s FIRE window (bounded by pads)
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PAD * TICK_HZ + # 1 s gap
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FIRE * (2 * TICK_HZ) # 2.000 s FIRE window ending AT end-of-data
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)
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print('phase %s: stream %d bytes = %.3f s' % (mode, len(stream), len(stream) / TICK_HZ))
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if mode == 'B':
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pgood = rd('cnc/laser_pgood')
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if pgood != '0':
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print('ABORT: laser_pgood=%s (HV supply reports good) - refusing phase B' % pgood)
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sys.exit(1)
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snap('pre ')
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wr('cnc/motor_lock', 15)
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wr('cnc/step_freq', TICK_HZ)
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wr('cnc/laser_latch', 1)
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fd = os.open('/dev/glowforge', os.O_WRONLY)
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try:
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fcntl.flock(fd, fcntl.LOCK_EX)
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os.lseek(fd, 1, os.SEEK_SET)
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wr('cnc/enable', 1)
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time.sleep(0.5)
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os.write(fd, stream)
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pos_before = rd_pos()
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if mode == 'B':
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wr('cnc/laser_latch', 0) # UNLOCK for this run only
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print('latch UNLOCKED for phase B run')
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wr('cnc/run', 1)
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t0 = time.time()
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sampled_mid = False
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state = ''
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while time.time() - t0 < 20:
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state = rd('cnc/state')
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if not sampled_mid and 1.5 < time.time() - t0 < 3.0:
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snap('mid (inside FIRE window)')
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sampled_mid = True
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if state != 'running':
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break
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time.sleep(0.1)
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print('done: state=%s after %.1f s' % (state, time.time() - t0))
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finally:
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wr('cnc/laser_latch', 1) # re-lock unconditionally
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fcntl.flock(fd, fcntl.LOCK_UN)
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os.close(fd)
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pos_after = rd_pos()
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print('pos before=%s after=%s MOVED=%s' % (pos_before, pos_after, pos_before[:3] != pos_after[:3]))
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snap('post')
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print('underruns=%s faults=%s' % (rd('cnc/underruns'), rd('cnc/faults')))
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wr('cnc/disable', 1)
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print('safe state restored: state=%s latch=LOCKED' % rd('cnc/state'))
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