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https://github.com/rzzzwilson/pymlac.git
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95 lines
2.4 KiB
Python
95 lines
2.4 KiB
Python
#!/usr/bin/python
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"""
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Emulate the Paper Tape Punch (PTP).
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"""
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from Globals import *
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class Ptp(object):
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# define various internal states
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MOTOR_ON = 1
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MOTOR_OFF = 0
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DEVICE_NOT_READY = 0
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DEVICE_READY = 1
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PTP_CHARS_PER_SECOND = 30
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DEVICE_NOT_READY_CYCLES = int(CYCLES_PER_SECOND / PTP_CHARS_PER_SECOND)
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# module-level state variables
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motor_state = MOTOR_OFF
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device_state = DEVICE_NOT_READY
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filename = None
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open_file = None
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cycle_count = None
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def init(self):
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"""Initialize the punch."""
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self.motor_state = self.MOTOR_OFF
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self.device_state = self.DEVICE_NOT_READY
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self.filename = None
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self.open_file = None
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def mount(self, ptp_filename):
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"""Mount a file on the punch."""
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self.motor_state = self.MOTOR_OFF
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self.device_state = self.DEVICE_NOT_READY
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self.filename = ptp_filename
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self.open_file = open(self.filename, 'w')
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def dismount(self):
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"""Dismount the file from the punch."""
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self.motor_state = self.MOTOR_OFF
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self.device_state = self.DEVICE_NOT_READY
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if self.open_file:
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self.open_file.close()
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self.filename = None
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self.open_file = None
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def start(self):
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"""Start the punch motor."""
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self.motor_state = self.MOTOR_ON
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self.device_state = self.DEVICE_NOT_READY
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self.cycle_count = self.DEVICE_NOT_READY_CYCLES
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def stop(self):
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"""Stop the punch motor."""
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self.motor_state = self.MOTOR_OFF
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self.device_state = self.DEVICE_NOT_READY
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def write(self, ch):
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"""Punch an 8 bit value to the tape file."""
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print('PTP.write: ch=%s (%d)' % (type(ch), ch))
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self.device_state = self.DEVICE_NOT_READY
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self.cycle_count = self.DEVICE_NOT_READY_CYCLES
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self.open_file.write(str(ch))
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def tick(self, cycles):
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"""Move the state of the punch along."""
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print('PTP: tick() called, cycles=%s, self.cycle_count=%s' % (str(cycles), str(self.cycle_count)))
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if self.motor_state == self.MOTOR_OFF or not self.open_file:
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self.device_state = self.DEVICE_NOT_READY
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return
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self.cycle_count -= cycles
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if self.cycle_count <= 0:
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self.device_state = self.DEVICE_READY
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def ready(self):
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"""Get the punch state."""
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return self.device_state == self.DEVICE_READY
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