mirror of
https://github.com/rzzzwilson/pymlac.git
synced 2025-06-10 09:32:41 +00:00
174 lines
3.6 KiB
Python
174 lines
3.6 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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Test the pymlac papertape reader code.
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Usage: test_PTR_PTP.py <options>
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where <filename> is a papertape file (*.ptp)
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and <options> is zero or more of:
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-h print this help and stop
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"""
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# We exercise the papertape reader module by:
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# 1. manipulating the device to test error conditions
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# 2. writing test *.ptp files which we mount and read
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import Ptr
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import Ptp
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# module global constants
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PtrFilename = '_#PTR#_.ptp'
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PtpFilename = '_#PTP#_.ptp'
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def read_no_tape():
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"""Read from device with no tape mounted."""
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# read before turning on
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byte = Ptr.read()
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if byte != 0377:
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print('Error')
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Ptr.tick(1000000) # wait a long time
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byte = Ptr.read()
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if byte != 0377:
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print('Error')
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# turn device on, still no tape
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Ptr.start()
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Ptr.tick(1000000) # wait a long time
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byte = Ptr.read()
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if byte != 0377:
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print('Error')
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Ptr.tick(1000000) # wait a long time
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byte = Ptr.read()
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if byte != 0377:
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print('Error')
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Ptr.stop()
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def create_papertape(filename):
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"""Create a PTP file."""
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# create a test papertape
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with open(filename, 'wb') as fd:
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# leader
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for _ in range(128):
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fd.write(chr(0))
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for v in range(1, 256):
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fd.write(chr(v))
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# trailer
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for _ in range(128):
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fd.write(chr(0))
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def create_papertape_ptp(filename):
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"""Create a PTP file using the Ptp device."""
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Ptp.mount(filename)
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Ptp.start()
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# leader
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for _ in range(128):
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while not Ptp.ready():
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Ptp.tick(1)
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Ptp.write(chr(0))
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while Ptp.ready():
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Ptp.tick(1)
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# body
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for v in range(1, 256):
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while not Ptp.ready():
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Ptp.tick(1)
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Ptp.write(chr(v))
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while Ptp.ready():
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Ptp.tick(1)
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# trailer
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for _ in range(128):
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while not Ptp.ready():
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Ptp.tick(1)
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Ptp.write(chr(0))
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while Ptp.ready():
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Ptp.tick(1)
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Ptp.stop()
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Ptp.dismount()
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def read_tape(filename):
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"""Create tape and read it."""
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# now mount and read tape
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Ptr.mount(filename)
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Ptr.start()
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# read leader
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byte = None
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count = 0
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while True:
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while not Ptr.ready():
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Ptr.tick(1)
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byte = Ptr.read()
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while Ptr.ready():
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Ptr.tick(1)
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if byte != 0:
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break
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count += 1
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print('%d bytes of leader' % count)
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# read body, already read first byte
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byte = None
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count = 1
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while True:
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while not Ptr.ready():
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Ptr.tick(1)
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byte = Ptr.read()
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while Ptr.ready():
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Ptr.tick(1)
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if byte == 0:
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break
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count += 1
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print('%d bytes of body' % count)
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# read trailer, already read first byte
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byte = None
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count = 1
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while True:
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while not Ptr.ready():
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Ptr.tick(1)
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byte = Ptr.read()
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if byte != 0:
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break
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count += 1
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while Ptr.ready():
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Ptr.tick(1)
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Ptr.stop()
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print('%d bytes of trailer' % count)
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def main():
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"""Test the papertape reader."""
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Ptr.init()
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Ptp.init()
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read_no_tape()
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create_papertape(PtrFilename)
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read_tape(PtrFilename)
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create_papertape_ptp(PtpFilename)
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read_tape(PtpFilename)
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################################################################################
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if __name__ == '__main__':
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main()
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