forked from dangardner/pylcdsysinfo
/
pylcdsysinfo.py
556 lines (471 loc) · 23 KB
/
pylcdsysinfo.py
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# -*- coding: UTF-8 -*-
#
# Interface with LCD Sys info USB device
#
# Copyright (C) 2012 Dan Gardner
#
# USB initialisation code has been adapted from pywws by Jim Easterbrook
# display_{text,icon}_anywhere by Manuel Mausz
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# See <http://www.gnu.org/licenses/gpl-3.0.txt>
import usb.core, time, struct
_font_length_table = [
0x11, 0x06, 0x08, 0x15, 0x0E, 0x19, 0x15, 0x03, 0x08, 0x08, 0x0F, 0x0D,
0x05, 0x08, 0x06, 0x0B, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
0x11, 0x11, 0x06, 0x06, 0x13, 0x10, 0x13, 0x0C, 0x1A, 0x14, 0x10, 0x12,
0x13, 0x0F, 0x0D, 0x13, 0x11, 0x04, 0x07, 0x11, 0x0E, 0x14, 0x11, 0x15,
0x0F, 0x15, 0x12, 0x10, 0x13, 0x11, 0x14, 0x1C, 0x13, 0x13, 0x12, 0x07,
0x0B, 0x07, 0x0B, 0x02, 0x08, 0x0E, 0x0F, 0x0E, 0x0F, 0x10, 0x0B, 0x0F,
0x0E, 0x04, 0x07, 0x0F, 0x04, 0x18, 0x0E, 0x10, 0x0F, 0x0F, 0x0A, 0x0D,
0x0B, 0x0E, 0x10, 0x16, 0x10, 0x10, 0x0E, 0x01, 0x11, 0x02
]
large_image_indexes = [x * 38 + 180 for x in range(0,8)]
# Padding necessary for left-aligned text in the right-hand column.
COL2LEFT = '|' * 9 + '___'
CTRL_READ = 0xc0
CTRL_WRITE = 0x40
def count_bits_set(field):
"""Count the number of bits set in an integer
Discovered independently by:
- Brian W. Kernighan (C Programming Language 2nd Ed.)
- Peter Wegner (CACM 3 (1960), 322)
- Derrick Lehmer (published in 1964 in a book edited by Beckenbach)
Source: http://www-graphics.stanford.edu/~seander/bithacks.html
"""
count = 0
while field:
field &= field - 1
count += 1
return count
class TextColours(object):
"""Colour palette for text colours"""
GREEN = 1
YELLOW = 2
RED = 3
WHITE = 5
CYAN = 6
GREY = 7
BLACK = 13
BROWN = 15
BRICK_RED = 16
DARK_BLUE = 17
LIGHT_BLUE = 18
ORANGE = 21
PURPLE = 22
PINK = 23
PEACH = 24
GOLD = 25
LAVENDER = 26
ORANGE_RED = 27
MAGENTA = 28
NAVY = 30
LIGHT_GREEN = 31
class BackgroundColours(object):
"""Palette of 16-bit (highcolor) background colours"""
BLACK = 0x0000
BLUE = 0x001f
GREEN = 0x07e0
CYAN = 0x07ff
BROWN = 0x79e0
DARK_GREY = 0x7bef
LIGHT_GREY = 0xbdf7
RED = 0xf800
PURPLE = 0xf81f
ORANGE = 0xfbe0
GOLD = 0xfd20
YELLOW = 0xffe0
WHITE = 0xffff
class TextAlignment(object):
"""Text alignment specifiers"""
NONE = -1
CENTRE = 0
LEFT = 1
RIGHT = 2
class TextLines(object):
"""Text line specifiers"""
LINE_1 = 1 << 0
LINE_2 = 1 << 1
LINE_3 = 1 << 2
LINE_4 = 1 << 3
LINE_5 = 1 << 4
LINE_6 = 1 << 5
ALL = LINE_1 + LINE_2 + LINE_3 + LINE_4 + LINE_5 + LINE_6
class LCDSysInfo(object):
"""A Python driver for the Coldtears LCD Sys Info
(http://coldtearselectronics.wikispaces.com/)
"""
usb_timeout_ms = 5000
clear_line_wait_ms = 1000
erase_sector_wait_ms = 220
min_display_icon_wait_ms = 10
max_display_icon_wait_ms = 700
write_page_wait_ms = 15
display_sysinfo_wait_ms = 50
# Values for calculating line-drawing times
max_display_text_wait_ms = 85
chars_per_icon = 2.75
def __init__(self, index=0):
"""Opens a handle to an LCD Sys Info device.
Args:
index (int): The index of the device in the list of connected LCD
Sys Info devices, with zero (the default) being the first device.
Raises:
IOError: An error ocurred while opening the LCD Sys Info device.
"""
devs = usb.core.find(idVendor=0x16c0, idProduct=0x05dc, find_all=True)
if not devs or len(devs) < index:
raise IOError("LCD Sys Info device not found")
dev = devs[index]
interface = 0
try:
dev.set_configuration()
dev._ctx.managed_claim_interface(dev, interface)
except usb.core.USBError:
try:
dev.detach_kernel_driver(interface)
dev._ctx.managed_claim_interface(dev, interface)
except usb.core.USBError:
raise IOError("Failed to claim interface")
self.dev = dev
self.dev.default_timeout = self.usb_timeout_ms
def _find_device(self, idVendor, idProduct, index):
"""Locate the index'th device with specified vendor and product id."""
for bus in usb.busses():
for dev in bus.devices:
if dev.idVendor == idVendor and dev.idProduct == idProduct:
index -= 1
if index < 0:
return dev
return None
def _le_unpack(self, byte):
"""Converts little-endian byte string to integer."""
return sum([ b << (8 * i) for i, b in enumerate(byte) ])
def _bmp_to_raw(self, bmpfile):
"""Converts a 16bpp, RGB 5:6:5 bitmap to a raw format bytearray."""
data_offset = self._le_unpack(bytearray(bmpfile[0x0a:0x0d]))
width = self._le_unpack(bytearray(bmpfile[0x12:0x15]))
height = self._le_unpack(bytearray(bmpfile[0x16:0x19]))
bpp = self._le_unpack(bytearray(bmpfile[0x1c:0x1d]))
if bpp != 16:
raise IOError("Image is not 16bpp")
if (width != 36 or height != 36) and (width != 320 or height != 240):
raise IOError("Image dimensions must be 36x36 or 320x240 (not %dx%d)" % (width, height))
raw_size = width * height * 2
rawfile = bytearray(b'\x00' * (raw_size + 8))
rawfile[0:8] = [16, 16, bmpfile[0x13], bmpfile[0x12], bmpfile[0x17], bmpfile[0x16], 1, 27]
raw_index = 8
for y in range(0, height):
current_index = (width * (height - (y + 1)) * 2) + data_offset
for k in range(0, width):
rawfile[raw_index] = bmpfile[current_index + 1]
rawfile[raw_index + 1] = bmpfile[current_index]
raw_index += 2
current_index += 2
return rawfile
def set_brightness(self, value):
"""Set the brightness of the LCD backlight without saving the value to the device.
Args:
value (int): Number representing the LCD brightness, in the range 0 to 255.
"""
value = max(0, min(value, 255))
self.dev.ctrl_transfer(CTRL_WRITE, 13, min(value, 255), min(value, 255))
def save_brightness(self, off_value, on_value):
"""Set the brightness of the LCD backlight when idle and active and
save the values to the device.
Args:
off_value (int): Number representing the LCD backlight brightness
when the LCD is idle.
on_value (int): Number representing the LCD backlight brightness
when the LCD is active.
"""
self.dev.ctrl_transfer(CTRL_WRITE, 14, off_value + on_value * 256, 0)
def display_icon(self, position, icon_number):
"""Display an icon at a specified position on the device.
Args:
position (int): Number representing the position in which to display
the icon, in the range 0 to 47, where 0 is the top-left corner
of the display and 48 is the bottom-right corner.
icon_number (int): The index of the icon to be displayed. This may be
in the range 1 to 43 for the default icons or 257+ for downloaded
icons. An invalid icon number will display garbage to screen.
"""
# TODO create enumeration class for icons
position = max(0, min(position, 47))
self.dev.ctrl_transfer(CTRL_WRITE, 27, position * 512 + icon_number, 25600)
if icon_number in large_image_indexes:
time.sleep(self.max_display_icon_wait_ms / 1000.0)
else:
time.sleep(self.min_display_icon_wait_ms / 1000.0)
def display_icon_anywhere(self, pos_x, pos_y, icon_number):
"""Display an icon at an exact position on the device.
Requires firmware >=1.04
Args:
pos_x (int): Number representing the position on the x-axis, in the
range 0 to 320 minus the width of your icon, where 0 is the left
edge of the display and 320 is the right edge.
pos_y (int): Number representing the position on the y-axis, in the
range 0 to 240 minus the width of your icon, where 0 is the top
edge of the display and 240 is the bottom edge.
icon_number (int): The index of the icon to be displayed. This may be
in the range 1 to 43 for the default icons or 257+ for downloaded
icons. An invalid icon number will display garbage to screen.
"""
# TODO create enumeration class for icons
pos_x = max(0, min(pos_x, 320))
pos_y = max(0, min(pos_y, 240))
ba = struct.pack("<BBBB", pos_y >> 8, pos_y & 0xFF, pos_x >> 8, pos_x & 0xFF)
tmp = (icon_number << 8) + icon_number
self.dev.ctrl_transfer(CTRL_WRITE, 29, tmp, tmp, ba)
if icon_number in large_image_indexes:
time.sleep(self.max_display_icon_wait_ms / 1000.0)
else:
time.sleep(self.min_display_icon_wait_ms / 1000.0)
def set_text_background_colour(self, colour):
"""Set the background colour for text display.
Args:
colour (int): The background colour from pylcdsysinfo.BackgroundColours.
"""
self.dev.ctrl_transfer(CTRL_WRITE, 30, colour, 0)
def _align_text(self, mm, alignment, screen_px, string_length_px):
"""Align text suitably for the specified screen width"""
spaces,pixels = divmod(screen_px - string_length_px, 17)
if alignment == TextAlignment.CENTRE:
mm = mm.center(len(mm) + spaces, " ").center(len(mm) + pixels, "{")
elif alignment == TextAlignment.LEFT:
mm = mm + " " * spaces + "{" * pixels
elif alignment == TextAlignment.RIGHT:
mm = " " * spaces + "{" * pixels + mm
return mm
def _text_conversion(self, mm, field_size, alignment):
"""Pad, truncate, align and otherwise munge the specified text."""
screen_px = (40 * field_size) - 1
mm = mm.strip().replace(" ", "___")
string_length_px = 0
for k in range(0, len(mm)):
ascii_value = ord(mm[k])
char_length_px = 0
if ascii_value >= 32 and ascii_value <= 125:
char_length_px = _font_length_table[ascii_value - 32]
if string_length_px + char_length_px > screen_px:
mm = mm[0:k]
break
string_length_px += char_length_px
return self._align_text(mm, alignment, screen_px, string_length_px)
def display_text_on_line(self, line, text_string, pad_for_icon, alignment, colour, field_length=8):
"""Display text on a line of the device.
Args:
line (int): The line on which the text should be displayed, in the range 1 to 6.
text_string (str): The text to be displayed, which will be truncated as
required. Use "|" for wider spacing and "^" to display a "degrees" symbol.
Use "\\t" (TAB) to construct a two-column layout.
pad_for_icon (bool): If true, padding will be added to the left of the text,
to accommodate an icon.
alignment (int): The text alignment from pylcdsysinfo.TextAlignment.
May be a list/tuple with two values if text_string contains "\\t".
colour (int): The text colour from pylcdsysinfo.TextColours.
field_length (int): If provided, limits the size of the region in
which left/center/right alignment applies to the specified
number of icon widths. Ignored if text_string contains "\\t".
"""
field_length = min(field_length, pad_for_icon and 7 or 8)
if '\t' in text_string:
field_length = [pad_for_icon and 3 or 4] * 2
text_string = [x.replace('\t', '') for x in text_string.split('\t', 1)]
if isinstance(alignment, tuple):
alignment = list(alignment)
elif not isinstance(alignment, list):
alignment = [alignment] * 2
# Make room for the icon
if pad_for_icon:
field_length.insert(1,1)
text_string.insert(1,'')
alignment.insert(1, TextAlignment.LEFT)
text_string = ''.join(self._text_conversion(*x) for x in zip(text_string, field_length, alignment)) + chr(0)
else:
text_string = self._text_conversion(text_string, field_length, alignment) + chr(0)
text_length = len(text_string)
if not pad_for_icon: # Cues the device to not leave space for the icon
text_length += 256
colour = min(colour, 32)
line = max(1, min(line, 6))
if isinstance(text_string, str):
text_string = text_string.encode("ascii")
self.dev.ctrl_transfer(CTRL_WRITE, 24, text_length, (line - 1) * 256 + colour,
text_string)
# Return how long to wait before sending more data
if isinstance(field_length, (list, tuple)):
field_length = sum(field_length)
field_length_as_percent = field_length * self.chars_per_icon / 22.0
time.sleep(self.max_display_text_wait_ms * field_length_as_percent / 1000)
def display_text_anywhere(self, pos_x, pos_y, text_string, colour):
"""Display text at an exact position on the device.
Requires firmware >=1.04
Args:
pos_x (int): Number representing the position on the x-axis, in the
range 0 to 320 minus the width of your icon, where 0 is the left
edge of the display and 320 is the right edge.
pos_y (int): Number representing the position on the y-axis, in the
range 0 to 240 minus the width of your icon, where 0 is the top
edge of the display and 240 is the bottom edge.
text_string (str): The text to be displayed
colour (int): The text colour from pylcdsysinfo.TextColours.
"""
pos_x = max(0, min(pos_x, 320))
pos_y = max(0, min(pos_y, 240))
pos_y2 = pos_y + 40
ba = struct.pack("<BBBBBBBB", pos_x >> 8, pos_x & 0xFF, pos_y >> 8, pos_y & 0xFF,
319 >> 8, 319 & 0xFF, pos_y2 >> 8, pos_y2 & 0xFF)
if isinstance(text_string, str):
text_string = text_string.encode("ascii")
ba += text_string
text_length = len(text_string)
colour = min(colour, 32)
self.dev.ctrl_transfer(CTRL_WRITE, 25, text_length, colour, ba)
time.sleep(self.max_display_text_wait_ms / 1000)
def dim_when_idle(self, value):
"""Set whether to dim the LCD backlight after the device has been idle for 10 seconds.
Args:
value (bool): If true, the LCD backlight will dim when the device is idle,
otherwise the function will be disabled.
"""
if value:
self.dev.ctrl_transfer(CTRL_WRITE, 17, 1, 0)
else:
self.dev.ctrl_transfer(CTRL_WRITE, 17, 0, 266)
def clear_lines(self, lines, colour):
"""Clear lines of the display using a coloured background.
Args:
lines (int): A number representing the lines to be cleared, using the
values from pylcdsysinfo.TextLines OR'd together to form bits 0 to 5.
colour (int): The background colour from pylcdsysinfo.BackgroundColours.
"""
lines = max(1, min(lines, 63))
self.dev.ctrl_transfer(CTRL_WRITE, 26, lines, colour)
time.sleep(self.clear_line_wait_ms * (count_bits_set(lines) / 6.0) * 0.8 / 1000)
def display_cpu_info(self, cpu_util, cpu_temp, util_colour=TextColours.GREEN, temp_colour=TextColours.GREEN):
"""Display CPU utilisation and temperature information.
Args:
cpu_util (int): Percentage CPU utilisation, to a maximum of 4 digits,
e.g. 994 will display 99.4%.
cpu_temp (int): CPU temperature in degrees Celsius, to a maximum of 2 digits,
e.g. 32 will display 32°C.
util_colour (int): The colour of the CPU utilitisation, from
pylcdsysinfo.BackgroundColours (defaults to GREEN).
temp_colour (int): The colour of the CPU temperature, from
pylcdsysinfo.BackgroundColours (defaults to GREEN).
"""
self.dev.ctrl_transfer(CTRL_WRITE, 21, cpu_util, cpu_temp, chr(util_colour) + chr(temp_colour))
time.sleep(self.display_sysinfo_wait_ms / 1000.0)
def display_ram_gpu_info(self, ram, gpu_temp, ram_colour=TextColours.GREEN, temp_colour=TextColours.GREEN):
"""Display available RAM and GPU temperature information.
Args:
ram (int): Available RAM in megabytes, to a maximum of 4 digits,
e.g. 1994 will display 1994Mb.
gpu_temp (int): GPU temperature in degrees Celsius, to a maximum of 2 digits,
e.g. 32 will display 32°C.
util_colour (int): The colour of the available RAM, from
pylcdsysinfo.BackgroundColours (defaults to GREEN).
temp_colour (int): The colour of the GPU temperature, from
pylcdsysinfo.BackgroundColours (defaults to GREEN).
"""
self.dev.ctrl_transfer(CTRL_WRITE, 22, ram, gpu_temp, chr(ram_colour) + chr(temp_colour))
time.sleep(self.display_sysinfo_wait_ms / 1000.0)
def display_network_info(self, recv, sent, recv_colour=TextColours.GREEN, sent_colour=TextColours.GREEN, recv_mb=False, sent_mb=False):
"""Display network utilisation information.
Args:
recv (int): Current network receive rate, to a maximum of 4 digits,
e.g. 1994 will display 1994Mb.
sent (int): Current network transmit rate, to a maximum of 4 digits,
e.g. 1994 will display 1994Mb.
recv_colour (int): The colour of the network receive rate, from
pylcdsysinfo.BackgroundColours (defaults to GREEN).
sent_colour (int): The colour of the network transmit rate, from
pylcdsysinfo.BackgroundColours (defaults to GREEN).
recv_mb (bool): Display receive rate in kb instead of the default Mb.
sent_mb (bool): Display transmit rate in kb instead of the default Mb.
"""
self.dev.ctrl_transfer(CTRL_WRITE, 20, recv, sent, chr(recv_mb) + chr(sent_mb) + chr(recv_colour) + chr(sent_colour))
time.sleep(self.display_sysinfo_wait_ms / 1000.0)
def display_fan_info(self, cpufan, chafan, cpufan_colour=TextColours.GREEN, chafan_colour=TextColours.GREEN):
"""Display fan speed information.
Args:
cpufan (int): Current CPU fan speed, to a maximum of 4 digits,
e.g. 1994 will display 1994rpm.
chafan (int): Current chassis fan speed, to a maximum of 4 digits,
e.g. 1994 will display 1994rpm.
cpufan_colour (int): The colour of the CPU fan speed, from
pylcdsysinfo.BackgroundColours (defaults to GREEN).
chafan_colour (int): The colour of the chassis fan speed, from
pylcdsysinfo.BackgroundColours (defaults to GREEN).
"""
self.dev.ctrl_transfer(CTRL_WRITE, 23, cpufan, chafan, chr(cpufan_colour) + chr(chafan_colour))
time.sleep(self.display_sysinfo_wait_ms / 1000.0)
def send_command_to_flash(self, address, command):
"""Send command to SPI flash memory.
Args:
address (int): Address of sector or page to write
command (int): 0=write enable, 1=write disable, 2=erase sector, 3=program page.
"""
self.dev.ctrl_transfer(CTRL_WRITE, 15, address, command)
def write_image_to_flash(self, sector, bitmap):
"""Write bitmap image to SPI flash memory.
Args:
sector (int): Address of starting sector (0-511).
bitmap (str): Contents of bitmap image, in 16bpp, RGB 5:6:5 format.
"""
address = sector * 16
rawfile = self._bmp_to_raw(bitmap)
# write enable flash
self.send_command_to_flash(0, 5)
file_index = 0
# flash is 2Mb, consisting of 512 x 4096-byte sectors
# each sector is 4096 bytes, consisting of 16 x 256-byte pages
# each page is 256 bytes, consisting of 4 x 64-byte chunks
for sector in range(0, 1 + int(len(rawfile) / 4096)):
# erase sector
self.send_command_to_flash(int(address / 16), 2)
time.sleep(self.erase_sector_wait_ms / 1000)
for page in range(0, 16):
for chunk in range(0, 4):
temp_byte = bytearray(b"\x00" * 64)
for k in range(0, 64):
if file_index < len(rawfile):
temp_byte[k] = rawfile[file_index]
file_index += 1
# send 64 byte chunk to device's memory buffer, chunk=0,1,2,3
self.dev.ctrl_transfer(CTRL_WRITE, 16, 0, chunk, temp_byte)
# fetch 2-byte checksum calculated by device
b = self.dev.ctrl_transfer(CTRL_READ, 12, 0, 0, 2)
device_checksum = b[0] * 256 + b[1]
# calculate checksum locally
local_checksum = sum([
rawfile[i] for i in range(file_index - 256, min(file_index, len(rawfile)))
])
if device_checksum != local_checksum:
raise IOError("Checksum error in page %4x (device=%d local=%d)" % (address, device_checksum, local_checksum))
# write this 256-byte page to flash memory
self.send_command_to_flash(address, 3)
time.sleep(self.write_page_wait_ms / 1000)
address += 1
# write disable flash
self.send_command_to_flash(0, 1)
def get_device_info(self):
"""Retrieve device information."""
info = { }
info['eeprom'] = self.devh.controlMsg(0xc0, 12, 8, 0, 1, self.usb_timeout_ms)
info['serial'] = self.devh.controlMsg(0xc0, 12, 8, 0, 5, self.usb_timeout_ms)
info['flash_id'] = self.devh.controlMsg(0xc0, 12, 2, 0, 6, self.usb_timeout_ms)
info['device_valid'] = (info['eeprom'][1] == 102 or info['eeprom'][1] == 103)
info['picture_frame_mode'] = (info['eeprom'][4] == 136)
info['8mb_flash'] = (((int(info['eeprom'][6] / 2) & 1) == 0) and ((int(info['eeprom'][6] / 4) & 1) == 0))
return info