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protocol.py
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protocol.py
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import construct as cst
import time
import sys
con = cst.Container # alias
HEADER = cst.Struct('pc_header',
cst.Magic('\x00'),
cst.Const(cst.UBInt8('lines'), 1),
cst.UBInt8('address'),
cst.Magic('\x03'))
SER_STATUS = cst.BitStruct('serst',
cst.Magic('\x01\x01\x00'),
cst.Flag('schedule_enabled'),
cst.Flag('ack_enabled'),
cst.Flag('further_pages'),
cst.Flag('interrupt_mode'),
cst.Magic('\x00'))
PAGE_IDX = cst.Bytes('page_num', 3)
TEMPO = cst.BitStruct('tempo',
cst.Magic('\x01\x01'),
cst.Enum(cst.BitField('display_ctrl', 2),
TIMED=0, FIXED_ON=1, FIXED_OFF=2),
cst.Enum(cst.BitField('persist_time', 4),
S2=1, S5=2, S10=3, S20=4, S30=5,
S45=6, S60=7, S90=8, S120=9))
# TODO: union persist_time with scroll_speed
PAGE_FUNC = cst.BitStruct('page_func',
cst.Magic('\x01\x01'),
cst.Flag('show_temp'),
cst.Flag('show_time'),
cst.Enum(cst.BitField('page_effect', 4),
RANDOM=0,
APPEAR=1,
WIPE=2,
OPEN=3,
LOCK=4,
ROTATE=5,
RIGHT=6,
LEFT=7,
ROLL_UP=8,
ROLL_DOWN=9,
PINGPONG=10,
FILL_UP=11,
PAINT=12,
FADE_IN=13,
JUMP=14,
SLIDE=15))
PAGE_CFG = cst.BitStruct('page_cfg',
cst.Magic('\x01'),
cst.Flag('background_on'),
cst.Flag('non_english'),
cst.Flag('autocenter'),
cst.Flag('bold_joins_78'),
cst.Flag('bold_joins_56'),
cst.Flag('bold_joins_34'),
cst.Flag('bold_joins_12'),
)
CMD_SEQ = cst.Sequence('_cmd', cst.Magic('\x1c'),
cst.Enum(cst.Byte('cmd'),
FLASH='F', ENLARGE='E',
RED='R', GREEN='G', YELLOW='Y',
MULTICOLOUR='M', DEFAULT='D'))
PAGE = cst.Struct('page',
PAGE_IDX,
cst.Embed(TEMPO),
cst.Embed(PAGE_FUNC),
cst.Embed(PAGE_CFG),
cst.CString('body', terminators='\x04'))
DATETIME_BODY = cst.Struct('datetime_page',
cst.Const(PAGE_IDX, '000'),
)
# values as ascii numbers 0x30-0x39
# hours_m
# hours_l
# mins_m
# mins_l
# secs_m
# secs_l
# date_m
# date_l
# mon_m
# mon_l
# day_m (= '0')
# day_l (1=sun, 2=mon...)
MESSAGE = cst.Struct('msg', HEADER, SER_STATUS, PAGE)
def datetime_page():
pass
def header(addr=1):
return con(address=addr, lines=1)
def mk_serst(sched=False, ack=True, more=False, intr=False):
return con(schedule_enabled=sched,
ack_enabled=ack,
further_pages=more,
interrupt_mode=intr)
def mk_page(msg):
return con(page_num='001',
display_ctrl='TIMED',
persist_time='S10',
show_temp=False,
show_time=False,
page_effect='APPEAR',
background_on=False,
non_english=False,
autocenter=False,
bold_joins_78=False,
bold_joins_56=False,
bold_joins_34=False,
bold_joins_12=False,
body=msg
)
def build_checksum(buf):
chk = 0
for c in buf:
chk ^= c
return chk
def simple_static_message(message):
c = con(pc_header=header(),
serst=mk_serst(intr=False),
page=mk_page(msg=message)
)
ba_packet = bytearray(MESSAGE.build(c))
ck = build_checksum(ba_packet)
ba_packet.append(ck)
return str(ba_packet)
def main(*args):
pass
if __name__ == '__main__':
import sys
args = sys.argv[1:]
main(args)