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#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# Urwid LCD display module
# Copyright (C) 2010 Ian Ward
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Urwid web site: http://excess.org/urwid/
from __future__ import division, print_function
from .display_common import BaseScreen
import time
class LCDScreen(BaseScreen):
def set_terminal_properties(self, colors=None, bright_is_bold=None,
has_underline=None):
pass
def set_mouse_tracking(self, enable=True):
pass
def set_input_timeouts(self, *args):
pass
def reset_default_terminal_palette(self, *args):
pass
def draw_screen(self, size, r ):
pass
def clear(self):
pass
def get_cols_rows(self):
return self.DISPLAY_SIZE
class CFLCDScreen(LCDScreen):
"""
Common methods for Crystal Fontz LCD displays
"""
KEYS = [None, # no key with code 0
'up_press', 'down_press', 'left_press',
'right_press', 'enter_press', 'exit_press',
'up_release', 'down_release', 'left_release',
'right_release', 'enter_release', 'exit_release',
'ul_press', 'ur_press', 'll_press', 'lr_press',
'ul_release', 'ur_release', 'll_release', 'lr_release']
CMD_PING = 0
CMD_VERSION = 1
CMD_CLEAR = 6
CMD_CGRAM = 9
CMD_CURSOR_POSITION = 11 # data = [col, row]
CMD_CURSOR_STYLE = 12 # data = [style (0-4)]
CMD_LCD_CONTRAST = 13 # data = [contrast (0-255)]
CMD_BACKLIGHT = 14 # data = [power (0-100)]
CMD_LCD_DATA = 31 # data = [col, row] + text
CMD_GPO = 34 # data = [pin(0-12), value(0-100)]
# sent from device
CMD_KEY_ACTIVITY = 0x80
CMD_ACK = 0x40 # in high two bits ie. & 0xc0
CURSOR_NONE = 0
CURSOR_BLINKING_BLOCK = 1
CURSOR_UNDERSCORE = 2
CURSOR_BLINKING_BLOCK_UNDERSCORE = 3
CURSOR_INVERTING_BLINKING_BLOCK = 4
MAX_PACKET_DATA_LENGTH = 22
colors = 1
has_underline = False
def __init__(self, device_path, baud):
"""
device_path -- eg. '/dev/ttyUSB0'
baud -- baud rate
"""
super(CFLCDScreen, self).__init__()
self.device_path = device_path
from serial import Serial
self._device = Serial(device_path, baud, timeout=0)
self._unprocessed = ""
@classmethod
def get_crc(cls, buf):
# This seed makes the output of this shift based algorithm match
# the table based algorithm. The center 16 bits of the 32-bit
# "newCRC" are used for the CRC. The MSB of the lower byte is used
# to see what bit was shifted out of the center 16 bit CRC
# accumulator ("carry flag analog");
newCRC = 0x00F32100
for byte in buf:
# Push this byte’s bits through a software
# implementation of a hardware shift & xor.
for bit_count in range(8):
# Shift the CRC accumulator
newCRC >>= 1
# The new MSB of the CRC accumulator comes
# from the LSB of the current data byte.
if ord(byte) & (0x01 << bit_count):
newCRC |= 0x00800000
# If the low bit of the current CRC accumulator was set
# before the shift, then we need to XOR the accumulator
# with the polynomial (center 16 bits of 0x00840800)
if newCRC & 0x00000080:
newCRC ^= 0x00840800
# All the data has been done. Do 16 more bits of 0 data.
for bit_count in range(16):
# Shift the CRC accumulator
newCRC >>= 1
# If the low bit of the current CRC accumulator was set
# before the shift we need to XOR the accumulator with
# 0x00840800.
if newCRC & 0x00000080:
newCRC ^= 0x00840800
# Return the center 16 bits, making this CRC match the one’s
# complement that is sent in the packet.
return ((~newCRC)>>8) & 0xffff
def _send_packet(self, command, data):
"""
low-level packet sending.
Following the protocol requires waiting for ack packet between
sending each packet to the device.
"""
buf = chr(command) + chr(len(data)) + data
crc = self.get_crc(buf)
buf = buf + chr(crc & 0xff) + chr(crc >> 8)
self._device.write(buf)
def _read_packet(self):
"""
low-level packet reading.
returns (command/report code, data) or None
This method stored data read and tries to resync when bad data
is received.
"""
# pull in any new data available
self._unprocessed = self._unprocessed + self._device.read()
while True:
try:
command, data, unprocessed = self._parse_data(self._unprocessed)
self._unprocessed = unprocessed
return command, data
except self.MoreDataRequired:
return
except self.InvalidPacket:
# throw out a byte and try to parse again
self._unprocessed = self._unprocessed[1:]
class InvalidPacket(Exception):
pass
class MoreDataRequired(Exception):
pass
@classmethod
def _parse_data(cls, data):
"""
Try to read a packet from the start of data, returning
(command/report code, packet_data, remaining_data)
or raising InvalidPacket or MoreDataRequired
"""
if len(data) < 2:
raise cls.MoreDataRequired
command = ord(data[0])
plen = ord(data[1])
if plen > cls.MAX_PACKET_DATA_LENGTH:
raise cls.InvalidPacket("length value too large")
if len(data) < plen + 4:
raise cls.MoreDataRequired
crc = cls.get_crc(data[:2 + plen])
pcrc = ord(data[2 + plen]) + (ord(data[3 + plen]) << 8 )
if crc != pcrc:
raise cls.InvalidPacket("CRC doesn't match")
return (command, data[2:2 + plen], data[4 + plen:])
class KeyRepeatSimulator(object):
"""
Provide simulated repeat key events when given press and
release events.
If two or more keys are pressed disable repeating until all
keys are released.
"""
def __init__(self, repeat_delay, repeat_next):
"""
repeat_delay -- seconds to wait before starting to repeat keys
repeat_next -- time between each repeated key
"""
self.repeat_delay = repeat_delay
self.repeat_next = repeat_next
self.pressed = {}
self.multiple_pressed = False
def press(self, key):
if self.pressed:
self.multiple_pressed = True
self.pressed[key] = time.time()
def release(self, key):
if key not in self.pressed:
return # ignore extra release events
del self.pressed[key]
if not self.pressed:
self.multiple_pressed = False
def next_event(self):
"""
Return (remaining, key) where remaining is the number of seconds
(float) until the key repeat event should be sent, or None if no
events are pending.
"""
if len(self.pressed) != 1 or self.multiple_pressed:
return
for key in self.pressed:
return max(0, self.pressed[key] + self.repeat_delay
- time.time()), key
def sent_event(self):
"""
Cakk this method when you have sent a key repeat event so the
timer will be reset for the next event
"""
if len(self.pressed) != 1:
return # ignore event that shouldn't have been sent
for key in self.pressed:
self.pressed[key] = (
time.time() - self.repeat_delay + self.repeat_next)
return
class CF635Screen(CFLCDScreen):
u"""
Crystal Fontz 635 display
20x4 character display + cursor
no foreground/background colors or settings supported
see CGROM for list of close unicode matches to characters available
6 button input
up, down, left, right, enter (check mark), exit (cross)
"""
DISPLAY_SIZE = (20, 4)
# ① through ⑧ are programmable CGRAM (chars 0-7, repeated at 8-15)
# double arrows (⇑⇓) appear as double arrowheads (chars 18, 19)
# ⑴ resembles a bell
# ⑵ resembles a filled-in "Y"
# ⑶ is the letters "Pt" together
# partial blocks (▇▆▄▃▁) are actually shorter versions of (▉▋▌▍▏)
# both groups are intended to draw horizontal bars with pixel
# precision, use ▇*[▆▄▃▁]? for a thin bar or ▉*[▋▌▍▏]? for a thick bar
CGROM = (
u"①②③④⑤⑥⑦⑧①②③④⑤⑥⑦⑧"
u"►◄⇑⇓«»↖↗↙↘▲▼↲^ˇ█"
u" !\"#¤%&'()*+,-./"
u"0123456789:;<=>?"
u"¡ABCDEFGHIJKLMNO"
u"PQRSTUVWXYZÄÖÑܧ"
u"¿abcdefghijklmno"
u"pqrstuvwxyzäöñüà"
u"⁰¹²³⁴⁵⁶⁷⁸⁹½¼±≥≤μ"
u"♪♫⑴♥♦⑵⌜⌟“”()αɛδ∞"
u"@£$¥èéùìòÇᴾØøʳÅå"
u"⌂¢ΦτλΩπΨΣθΞ♈ÆæßÉ"
u"ΓΛΠϒ_ÈÊêçğŞşİι~◊"
u"▇▆▄▃▁ƒ▉▋▌▍▏⑶◽▪↑→"
u"↓←ÁÍÓÚÝáíóúýÔôŮů"
u"ČĔŘŠŽčĕřšž[\]{|}")
cursor_style = CFLCDScreen.CURSOR_INVERTING_BLINKING_BLOCK
def __init__(self, device_path, baud=115200,
repeat_delay=0.5, repeat_next=0.125,
key_map=['up', 'down', 'left', 'right', 'enter', 'esc']):
"""
device_path -- eg. '/dev/ttyUSB0'
baud -- baud rate
repeat_delay -- seconds to wait before starting to repeat keys
repeat_next -- time between each repeated key
key_map -- the keys to send for this device's buttons
"""
super(CF635Screen, self).__init__(device_path, baud)
self.repeat_delay = repeat_delay
self.repeat_next = repeat_next
self.key_repeat = KeyRepeatSimulator(repeat_delay, repeat_next)
self.key_map = key_map
self._last_command = None
self._last_command_time = 0
self._command_queue = []
self._screen_buf = None
self._previous_canvas = None
self._update_cursor = False
def get_input_descriptors(self):
"""
return the fd from our serial device so we get called
on input and responses
"""
return [self._device.fd]
def get_input_nonblocking(self):
"""
Return a (next_input_timeout, keys_pressed, raw_keycodes)
tuple.
The protocol for our device requires waiting for acks between
each command, so this method responds to those as well as key
press and release events.
Key repeat events are simulated here as the device doesn't send
any for us.
raw_keycodes are the bytes of messages we received, which might
not seem to have any correspondence to keys_pressed.
"""
input = []
raw_input = []
timeout = None
while True:
packet = self._read_packet()
if not packet:
break
command, data = packet
if command == self.CMD_KEY_ACTIVITY and data:
d0 = ord(data[0])
if 1 <= d0 <= 12:
release = d0 > 6
keycode = d0 - (release * 6) - 1
key = self.key_map[keycode]
if release:
self.key_repeat.release(key)
else:
input.append(key)
self.key_repeat.press(key)
raw_input.append(d0)
elif command & 0xc0 == 0x40: # "ACK"
if command & 0x3f == self._last_command:
self._send_next_command()
next_repeat = self.key_repeat.next_event()
if next_repeat:
timeout, key = next_repeat
if not timeout:
input.append(key)
self.key_repeat.sent_event()
timeout = None
return timeout, input, []
def _send_next_command(self):
"""
send out the next command in the queue
"""
if not self._command_queue:
self._last_command = None
return
command, data = self._command_queue.pop(0)
self._send_packet(command, data)
self._last_command = command # record command for ACK
self._last_command_time = time.time()
def queue_command(self, command, data):
self._command_queue.append((command, data))
# not waiting? send away!
if self._last_command is None:
self._send_next_command()
def draw_screen(self, size, canvas):
assert size == self.DISPLAY_SIZE
if self._screen_buf:
osb = self._screen_buf
else:
osb = []
sb = []
y = 0
for row in canvas.content():
text = []
for a, cs, run in row:
text.append(run)
if not osb or osb[y] != text:
self.queue_command(self.CMD_LCD_DATA, chr(0) + chr(y) +
"".join(text))
sb.append(text)
y += 1
if (self._previous_canvas and
self._previous_canvas.cursor == canvas.cursor and
(not self._update_cursor or not canvas.cursor)):
pass
elif canvas.cursor is None:
self.queue_command(self.CMD_CURSOR_STYLE, chr(self.CURSOR_NONE))
else:
x, y = canvas.cursor
self.queue_command(self.CMD_CURSOR_POSITION, chr(x) + chr(y))
self.queue_command(self.CMD_CURSOR_STYLE, chr(self.cursor_style))
self._update_cursor = False
self._screen_buf = sb
self._previous_canvas = canvas
def program_cgram(self, index, data):
"""
Program character data. Characters available as chr(0) through
chr(7), and repeated as chr(8) through chr(15).
index -- 0 to 7 index of character to program
data -- list of 8, 6-bit integer values top to bottom with MSB
on the left side of the character.
"""
assert 0 <= index <= 7
assert len(data) == 8
self.queue_command(self.CMD_CGRAM, chr(index) +
"".join([chr(x) for x in data]))
def set_cursor_style(self, style):
"""
style -- CURSOR_BLINKING_BLOCK, CURSOR_UNDERSCORE,
CURSOR_BLINKING_BLOCK_UNDERSCORE or
CURSOR_INVERTING_BLINKING_BLOCK
"""
assert 1 <= style <= 4
self.cursor_style = style
self._update_cursor = True
def set_backlight(self, value):
"""
Set backlight brightness
value -- 0 to 100
"""
assert 0 <= value <= 100
self.queue_command(self.CMD_BACKLIGHT, chr(value))
def set_lcd_contrast(self, value):
"""
value -- 0 to 255
"""
assert 0 <= value <= 255
self.queue_command(self.CMD_LCD_CONTRAST, chr(value))
def set_led_pin(self, led, rg, value):
"""
led -- 0 to 3
rg -- 0 for red, 1 for green
value -- 0 to 100
"""
assert 0 <= led <= 3
assert rg in (0, 1)
assert 0 <= value <= 100
self.queue_command(self.CMD_GPO, chr(12 - 2 * led - rg) +
chr(value))
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