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rzzzwilson.pymlac/pymlac/Kbd.py
Ross Wilson f0894c1bde Keyboard code working, not fully tested
2015-07-18 12:42:27 +07:00

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# !/usr/bin/python
"""
Emulate the Keyboard (KBD).
We must emulate funny Imlac key values.
"""
# The Imlac keyboard maintains an 11-bit value representing the ASCII value of
# the pressed key and any simultaneously pressed control keys:
#
# 5 6 7 8 9 10 11 12 13 14 14
# +---+---+---+---+---+---+---+---+---+---+---+
# | R | C | S | ASCII key code |
# +---+---+---+---+---+---+---+---+---+---+---+
#
# This 11-bit value is read into the AC when requested at the shown bit places.
# Bit 8, the ASCII high bit, is always zero on the Imlac.
#
# The R, C and S bits represent the state of the Repeat, Control and Shift keys,
# respectively.
#
# When the keyboard flag is cleard (either KCF or KRC instructions) the 8-bit
# ASCII buffer is cleared but the three status bits R, C and S are left alone.
#
##############################
#
# The wxPython event provides the following keyboard events:
# wx.EVT_KEY_DOWN when a key is pressed
# wx.EVT_KEY_UP when a key is pressed
# wx.EVT_CHAR when a fully modified ASCII char value is found
#
# In this code we use the UP/DOWN events to keep track of the modifiers
# and we use the CHAR event to change the key buffer value. We do it this way
# because on the Imlac the modifiers (R, C and S flags) are seperate from the
# keyboard value and are not cleared by the KCF or KRC instructions. This means
# Imlac code could check for the modifier flags alone at any time, so we have to
# keep track of the modifiers which DON'T raise a CHAR event. We therefore need
# to handle the key UP/DOWN events for the modifiers.
#
# Since most modern keyboards don't have a REPEAT key (they use auto-repeat) the
# R flag will always be 0.
class Kbd(object):
######
# This string has a \000 char at the PC key ordinal position if the key is dead.
# Anything else and the key is live and the value is the unshifted value.
######
# 0 1 2 3 4 5 6 7 8 9 A B C D E F
KeyVal = ('\000\000\000\000\000\000\000\000\000\211\000\000\000\215\000\000' #00
'\000\000\000\231\000\000\000\000\000\000\000\233\000\000\000\000' #01
'\240\000\000\000\000\000\000\247\000\000\000\000\254\255\256\257' #02
'\260\261\262\263\264\265\266\267\270\271\000\273\000\275\000\000' #03
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000' #04
'\000\000\000\000\000\000\000\000\000\000\000\000\212\000\000\000' #05
'\000\341\342\343\344\345\346\347\350\351\352\353\354\355\356\357' #06
'\360\361\362\363\364\365\366\367\370\371\372\000\000\000\000\377' #07
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000' #08
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000' #09
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000' #0A
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000' #0B
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000' #0C
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000' #0D
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000' #0E
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000' #0F
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000' #10
'\000\206\204\205\210\202\217\216\000\214\000\000\000\000\000\000' #11
'\000\000\000\000\000\000\000\000\000\000\000\000\000') #12
######
# This string has the shifted values for the key, indexed by PC key number.
######
# 0 1 2 3 4 5 6 7 8 9 A B C D E F
SKeyVal = ('\000\000\000\000\000\000\000\000\000\211\000\000\000\215\000\000'#00
'\000\000\000\231\000\000\000\000\000\000\000\233\000\000\000\000'#01
'\240\000\000\000\000\000\000\242\000\000\000\000\274\255\276\277'#02
'\251\241\262\243\244\245\266\246\252\250\000\272\000\253\000\000'#03
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000'#04
'\000\000\000\000\000\000\000\000\000\000\000\000\212\000\000\000'#05
'\000\301\302\303\304\305\306\307\310\311\312\313\314\315\316\317'#06
'\320\321\322\323\324\325\326\327\330\331\332\000\000\000\000\377'#07
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000'#08
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000'#09
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000'#0A
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000'#0B
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000'#0C
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000'#0D
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000'#0E
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000'#0F
'\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000'#10
'\000\206\204\205\210\202\217\216\000\214\000\000\000\000\000\000'#11
'\000\000\000\000\000\000\000\000\000\000\000\000\000') #12
# define the keycode values for modifier keys
KeyShift = 0x0132
KeyControl = 0x018c
# modifier key flags
FlagR = 0 # REPEAT key, always 0
FlagC = 0 # CONTROL key
FlagS = 0 # SHIFT key
def __init__(self):
self.clear()
# .clear() doesn't clear flags
self.FlagR = 0
self.FlagC = 0
self.FlagS = 0
def handle_down_event(self, event):
"""Handle a KEY DOWN event from wxPython.
This is only to track modifier keys.
"""
modifiers = event.GetModifiers()
keycode = event.GetKeyCode()
print('DOWN: Modifiers=%04x, GetKeyCode=%04x' % (modifiers, keycode))
if keycode == self.KeyShift:
self.FlagS = 1
elif keycode == self.KeyControl:
self.FlagC = 1
event.Skip()
def handle_up_event(self, event):
"""Handle a KEY UP event from wxPython.
This is only to track modifier keys.
"""
modifiers = event.GetModifiers()
keycode = event.GetKeyCode()
print(' UP: Modifiers=%04x, GetKeyCode=%04x' % (modifiers, keycode))
if keycode == self.KeyShift:
self.FlagS = 0
elif keycode == self.KeyControl:
self.FlagC = 0
event.Skip()
def handle_char_event(self, event):
"""Handle a CHAR key event."""
self.buffer = event.GetKeyCode()
print('NEW: %04x' % ord(self.buffer))
self.ready = True
def clear(self):
"""Clear keyboard buffer and READY flag."""
self.ready = False
self.buffer = 0
def read(self):
"""Read keyboard buffer and modifier keys."""
return (self.buffer & 0xff) + (self.FlagC << 9) + (self.FlagS << 8)
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