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https://github.com/openglow-org/forgefirm.git
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ScottW514
009944a29b
Scope on GPIO2_IO30 (the SoC FIRE drive): two 2.000 s FIRE windows, the second terminated only by the SDMA end-of-data backstop. Measured 2.0000 s exactly with clean edges on BOTH termination paths - normal completion and true underrun (streaming=1, kernel underrun state reached and acked; fire_test.py gains the U mode). The backstop drops FIRE within one tick regardless of how the stream dies. With the waveform, stream-path, latch, topology, and interlock- semantics results from earlier today, every standing hardware verification gate for live fire is now passed; what remains is the laser-milestone software and a chain-armed first-light procedure.
123 lines
4.1 KiB
Python
123 lines
4.1 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|U
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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.
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Phase A: laser latch LOCKED - expects nothing on the FIRE/LASER_ON nets.
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Phase B: latch UNLOCKED for the run (re-locked in finally), streaming=0
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(end-of-data = normal completion). Refuses to run if
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laser_pgood reports the HV supply good. Duty is zero throughout.
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Phase U: like B but with streaming=1 declared, so the terminal
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end-of-data is a TRUE UNDERRUN: the kernel lands in the
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`underrun` fault state (expected - the script acks it via
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stop). Same SDMA backstop, exercised through the fault path;
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the scope measurement on the FIRE net is identical.
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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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unlock = mode in ('B', 'U')
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underrun_mode = mode == 'U'
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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 unlock:
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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 latch unlock' % 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 underrun_mode:
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wr('cnc/streaming', 1) # end-of-data mid-run = true underrun
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print('streaming=1: terminal end-of-data will be a TRUE UNDERRUN (expected)')
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if unlock:
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wr('cnc/laser_latch', 0) # UNLOCK for this run only
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print('latch UNLOCKED for phase %s run' % mode)
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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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if underrun_mode:
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if state == 'underrun':
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print('underrun state reached as EXPECTED; acking via stop')
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else:
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print('WARNING: expected underrun state, got %s' % state)
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wr('cnc/stop', 1) # ack the underrun
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wr('cnc/streaming', 0)
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print('acked: state=%s' % rd('cnc/state'))
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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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