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klipper-dgus/klippy/extras/display/uc1701.py

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# Support for UC1701 (and similar) 128x64 graphics LCD displays
#
# Copyright (C) 2018-2019 Kevin O'Connor <kevin@koconnor.net>
# Copyright (C) 2018 Eric Callahan <arksine.code@gmail.com>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import logging
from .. import bus
from . import font8x14
BACKGROUND_PRIORITY_CLOCK = 0x7fffffff00000000
TextGlyphs = { 'right_arrow': '\x1a', 'degrees': '\xf8' }
class DisplayBase:
def __init__(self, io, columns=128):
self.send = io.send
# framebuffers
self.columns = columns
self.vram = [bytearray(self.columns) for i in range(8)]
self.all_framebuffers = [(self.vram[i], bytearray('~'*self.columns), i)
for i in range(8)]
# Cache fonts and icons in display byte order
self.font = [self._swizzle_bits(bytearray(c))
for c in font8x14.VGA_FONT]
self.icons = {}
def flush(self):
# Find all differences in the framebuffers and send them to the chip
for new_data, old_data, page in self.all_framebuffers:
if new_data == old_data:
continue
# Find the position of all changed bytes in this framebuffer
diffs = [[i, 1] for i, (n, o) in enumerate(zip(new_data, old_data))
if n != o]
# Batch together changes that are close to each other
for i in range(len(diffs)-2, -1, -1):
pos, count = diffs[i]
nextpos, nextcount = diffs[i+1]
if pos + 5 >= nextpos and nextcount < 16:
diffs[i][1] = nextcount + (nextpos - pos)
del diffs[i+1]
# Transmit changes
for col_pos, count in diffs:
# Set Position registers
ra = 0xb0 | (page & 0x0F)
ca_msb = 0x10 | ((col_pos >> 4) & 0x0F)
ca_lsb = col_pos & 0x0F
self.send([ra, ca_msb, ca_lsb])
# Send Data
self.send(new_data[col_pos:col_pos+count], is_data=True)
old_data[:] = new_data
def _swizzle_bits(self, data):
# Convert from "rows of pixels" format to "columns of pixels"
top = bot = 0
for row in range(8):
spaced = (data[row] * 0x8040201008040201) & 0x8080808080808080
top |= spaced >> (7 - row)
spaced = (data[row + 8] * 0x8040201008040201) & 0x8080808080808080
bot |= spaced >> (7 - row)
bits_top = [(top >> s) & 0xff for s in range(0, 64, 8)]
bits_bot = [(bot >> s) & 0xff for s in range(0, 64, 8)]
return (bytearray(bits_top), bytearray(bits_bot))
def set_glyphs(self, glyphs):
for glyph_name, glyph_data in glyphs.items():
icon = glyph_data.get('icon16x16')
if icon is not None:
top1, bot1 = self._swizzle_bits(icon[0])
top2, bot2 = self._swizzle_bits(icon[1])
self.icons[glyph_name] = (top1 + top2, bot1 + bot2)
def write_text(self, x, y, data):
if x + len(data) > 16:
data = data[:16 - min(x, 16)]
pix_x = x * 8
page_top = self.vram[y * 2]
page_bot = self.vram[y * 2 + 1]
for c in data:
bits_top, bits_bot = self.font[ord(c)]
page_top[pix_x:pix_x+8] = bits_top
page_bot[pix_x:pix_x+8] = bits_bot
pix_x += 8
def write_graphics(self, x, y, data):
if x >= 16 or y >= 4 or len(data) != 16:
return
bits_top, bits_bot = self._swizzle_bits(data)
pix_x = x * 8
page_top = self.vram[y * 2]
page_bot = self.vram[y * 2 + 1]
for i in range(8):
page_top[pix_x + i] ^= bits_top[i]
page_bot[pix_x + i] ^= bits_bot[i]
def write_glyph(self, x, y, glyph_name):
icon = self.icons.get(glyph_name)
if icon is not None and x < 15:
# Draw icon in graphics mode
pix_x = x * 8
page_idx = y * 2
self.vram[page_idx][pix_x:pix_x+16] = icon[0]
self.vram[page_idx + 1][pix_x:pix_x+16] = icon[1]
return 2
char = TextGlyphs.get(glyph_name)
if char is not None:
# Draw character
self.write_text(x, y, char)
return 1
return 0
def clear(self):
zeros = bytearray(self.columns)
for page in self.vram:
page[:] = zeros
def get_dimensions(self):
return (16, 4)
# IO wrapper for "4 wire" spi bus (spi bus with an extra data/control line)
class SPI4wire:
def __init__(self, config, data_pin_name):
self.spi = bus.MCU_SPI_from_config(config, 0, default_speed=10000000)
dc_pin = config.get(data_pin_name)
self.mcu_dc = bus.MCU_bus_digital_out(self.spi.get_mcu(), dc_pin,
self.spi.get_command_queue())
def send(self, cmds, is_data=False):
self.mcu_dc.update_digital_out(is_data,
reqclock=BACKGROUND_PRIORITY_CLOCK)
self.spi.spi_send(cmds, reqclock=BACKGROUND_PRIORITY_CLOCK)
# IO wrapper for i2c bus
class I2C:
def __init__(self, config, default_addr):
self.i2c = bus.MCU_I2C_from_config(config, default_addr=default_addr,
default_speed=400000)
def send(self, cmds, is_data=False):
if is_data:
hdr = 0x40
else:
hdr = 0x00
cmds = bytearray(cmds)
cmds.insert(0, hdr)
self.i2c.i2c_write(cmds, reqclock=BACKGROUND_PRIORITY_CLOCK)
# Helper code for toggling a reset pin on startup
class ResetHelper:
def __init__(self, pin_desc, io_bus):
self.mcu_reset = None
if pin_desc is None:
return
self.mcu_reset = bus.MCU_bus_digital_out(io_bus.get_mcu(), pin_desc,
io_bus.get_command_queue())
def init(self):
if self.mcu_reset is None:
return
mcu = self.mcu_reset.get_mcu()
curtime = mcu.get_printer().get_reactor().monotonic()
print_time = mcu.estimated_print_time(curtime)
# Toggle reset
minclock = mcu.print_time_to_clock(print_time + .100)
self.mcu_reset.update_digital_out(0, minclock=minclock)
minclock = mcu.print_time_to_clock(print_time + .200)
self.mcu_reset.update_digital_out(1, minclock=minclock)
# Force a delay to any subsequent commands on the command queue
minclock = mcu.print_time_to_clock(print_time + .300)
self.mcu_reset.update_digital_out(1, minclock=minclock)
# The UC1701 is a "4-wire" SPI display device
class UC1701(DisplayBase):
def __init__(self, config):
io = SPI4wire(config, "a0_pin")
DisplayBase.__init__(self, io)
self.contrast = config.getint('contrast', 40, minval=0, maxval=63)
self.reset = ResetHelper(config.get("rst_pin", None), io.spi)
def init(self):
self.reset.init()
init_cmds = [0xE2, # System reset
0x40, # Set display to start at line 0
0xA0, # Set SEG direction
0xC8, # Set COM Direction
0xA2, # Set Bias = 1/9
0x2C, # Boost ON
0x2E, # Voltage regulator on
0x2F, # Voltage follower on
0xF8, # Set booster ratio
0x00, # Booster ratio value (4x)
0x23, # Set resistor ratio (3)
0x81, # Set Electronic Volume
self.contrast, # Electronic Volume value
0xAC, # Set static indicator off
0x00, # NOP
0xA6, # Disable Inverse
0xAF] # Set display enable
self.send(init_cmds)
self.send([0xA5]) # display all
self.send([0xA4]) # normal display
self.flush()
# The SSD1306 supports both i2c and "4-wire" spi
class SSD1306(DisplayBase):
def __init__(self, config, columns=128):
cs_pin = config.get("cs_pin", None)
if cs_pin is None:
io = I2C(config, 60)
io_bus = io.i2c
else:
io = SPI4wire(config, "dc_pin")
io_bus = io.spi
self.reset = ResetHelper(config.get("reset_pin", None), io_bus)
DisplayBase.__init__(self, io, columns)
self.contrast = config.getint('contrast', 239, minval=0, maxval=255)
self.vcomh = config.getint('vcomh', 0, minval=0, maxval=63)
self.invert = config.getboolean('invert', False)
def init(self):
self.reset.init()
init_cmds = [
0xAE, # Display off
0xD5, 0x80, # Set oscillator frequency
0xA8, 0x3f, # Set multiplex ratio
0xD3, 0x00, # Set display offset
0x40, # Set display start line
0x8D, 0x14, # Charge pump setting
0x20, 0x02, # Set Memory addressing mode
0xA1, # Set Segment re-map
0xC8, # Set COM output scan direction
0xDA, 0x12, # Set COM pins hardware configuration
0x81, self.contrast, # Set contrast control
0xD9, 0xA1, # Set pre-charge period
0xDB, self.vcomh, # Set VCOMH deselect level
0x2E, # Deactivate scroll
0xA4, # Output ram to display
0xA7 if self.invert else 0xA6, # Set normal/invert
0xAF, # Display on
]
self.send(init_cmds)
self.flush()
# the SH1106 is SSD1306 compatible with up to 132 columns
class SH1106(SSD1306):
def __init__(self, config):
SSD1306.__init__(self, config, 132)
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