mirror of
https://github.com/openglow-org/forgefirm.git
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57 lines
1.9 KiB
Python
57 lines
1.9 KiB
Python
#!/usr/bin/env python3
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# Copyright 2026 514 LLC d/b/a OpenGlow
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# Written by Scott Wiederhold
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# https://community.openglow.org
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# SPDX-License-Identifier: MIT
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"""Hold LASER_PWM at one duty value for a measurement window, then restore.
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Usage: pwm_hold.py [sar] [seconds] (defaults: 8, 30)
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The duty register (PWMSAR) is the laser power SETPOINT only. Locked
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state only: run with the controller and forgectrl stopped (the bench
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page's takeover), the pulse device closed. The latch is relocked here
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as well, and the hold refuses to write if the FIRE line reads driven or
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LASER_ON reads active."""
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import mmap, struct, sys, time
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PWM2_BASE = 0x02084000
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SAR_OFF = 0x0C
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sar = int(sys.argv[1]) if len(sys.argv) > 1 else 8
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secs = int(sys.argv[2]) if len(sys.argv) > 2 else 30
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def rd(name):
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with open('/sys/glowforge/' + name) as f:
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return f.read().strip()
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def wr(name, val):
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with open('/sys/glowforge/' + name, 'w') as f:
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f.write(str(val))
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try:
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wr('cnc/laser_latch', 1)
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except OSError as e:
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raise SystemExit('could not lock the laser latch: %s' % e)
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time.sleep(0.2)
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en, on = rd('cnc/laser_enable'), rd('cnc/laser_on')
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if en != '0' or on != '0':
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raise SystemExit('not the locked state: laser_enable=%s laser_on=%s' % (en, on))
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with open('/dev/mem', 'r+b') as f:
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m = mmap.mmap(f.fileno(), 4096, mmap.MAP_SHARED,
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mmap.PROT_READ | mmap.PROT_WRITE, offset=PWM2_BASE)
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sar0 = struct.unpack('<I', m[SAR_OFF:SAR_OFF + 4])[0]
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m[SAR_OFF:SAR_OFF + 4] = struct.pack('<I', sar)
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print('PWMSAR=%d held for %d s (was %d)...' % (sar, secs, sar0))
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sys.stdout.flush()
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try:
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time.sleep(secs)
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finally:
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m[SAR_OFF:SAR_OFF + 4] = struct.pack('<I', sar0)
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print('restored PWMSAR=%d' % sar0)
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print('laser_enable=%s laser_on=%s laser_on_sampled=%s'
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% (rd('cnc/laser_enable'), rd('cnc/laser_on'), rd('cnc/laser_on_sampled')))
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m.close()
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