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# Support for UC1701 (128x64 graphics) LCD displays
#
# Copyright (C) 2018 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 font8x14 import VGA_FONT as CHAR_SET
BACKGROUND_PRIORITY_CLOCK = 0x7fffffff00000000
class UC1701:
char_right_arrow = '\x1a'
CURRENT_BUF, OLD_BUF = 0, 1
EMPTY_CHAR = (0, 32, 255)
def __init__(self, config):
printer = config.get_printer()
# pin config
ppins = printer.lookup_object('pins')
pins = [ppins.lookup_pin('digital_out', config.get(name + '_pin'))
for name in ['cs','a0']]
mcu = None
for pin_params in pins:
if mcu is not None and pin_params['chip'] != mcu:
raise ppins.error("uc1701 all pins must be on same mcu")
mcu = pin_params['chip']
if pin_params['invert']:
raise ppins.error("uc1701 can not invert pin")
self.pins = [pin_params['pin'] for pin_params in pins]
self.mcu = mcu
self.spi_oid = self.mcu.create_oid()
self.a0_oid = self.mcu.create_oid()
self.mcu.add_config_object(self)
self.glyph_buffer = []
self.spi_xfer_cmd = self.set_pin_cmd = None
self.vram = ([bytearray(128) for i in range(8)],
[bytearray('~'*128) for i in range(8)])
def build_config(self):
self.mcu.add_config_cmd(
"config_spi oid=%d bus=%d pin=%s mode=%d rate=%d shutdown_msg=" % (
self.spi_oid, 0, self.pins[0], 0, 10000000))
self.mcu.add_config_cmd(
"config_digital_out oid=%d pin=%s value=%d default_value=%d max_duration=%d" % (
self.a0_oid, self.pins[1], 0, 0, 0))
cmd_queue = self.mcu.alloc_command_queue()
self.spi_send_cmd = self.mcu.lookup_command(
"spi_send oid=%c data=%*s", cq=cmd_queue)
self.update_pin_cmd = self.mcu.lookup_command(
"update_digital_out oid=%c value=%c", cq=cmd_queue)
def send(self, cmds, is_data=False):
if is_data:
self.update_pin_cmd.send([self.a0_oid, 1], reqclock=BACKGROUND_PRIORITY_CLOCK)
else:
self.update_pin_cmd.send([self.a0_oid, 0], reqclock=BACKGROUND_PRIORITY_CLOCK)
self.spi_send_cmd.send([self.spi_oid, cmds], reqclock=BACKGROUND_PRIORITY_CLOCK)
def init(self):
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
0x28, # Electronic volume value (40)
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()
logging.info("uc1701 initialized")
def flush(self):
new_data = self.vram[self.CURRENT_BUF]
old_data = self.vram[self.OLD_BUF]
for page in range(8):
if new_data[page] == old_data[page]:
continue
# Find the position of all changed bytes in this framebuffer
diffs = [[i, 1] for i, (nd, od) in enumerate(zip(new_data[page], old_data[page]))
if nd != od]
# 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
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[page][col_pos:col_pos+count], is_data=True)
old_data[page][:] = new_data[page]
def set_pixel(self, pix_x, pix_y, exclusive=True):
page_idx = pix_y // 8
page_byte = 0x01 << (pix_y % 8)
if exclusive and self.vram[self.CURRENT_BUF][page_idx][pix_x] & page_byte:
#invert pixel if it has alread been set
self.vram[self.CURRENT_BUF][page_idx][pix_x] &= ~page_byte
else:
#set the correct pixel in the vram buffer to 1
self.vram[self.CURRENT_BUF][page_idx][pix_x] |= page_byte
def clear_pixel(self, pix_x, pix_y):
page_idx = pix_y // 8
page_byte = ~(0x01 << (pix_y % 8))
#set the correct pixel in the vram buffer to 0
self.vram[self.CURRENT_BUF][page_idx][pix_x] &= page_byte
def load_glyph(self, glyph_id, data):
if len(data) > 16:
data = data[:16]
self.glyph_buffer.append((glyph_id, data))
self.glyph_buffer.sort(key=lambda x: x[0])
def write_glyph(self, x, y, glyph_id):
pix_x = x*8
pix_y = y*16
data = self.glyph_buffer[glyph_id][1]
for bits in data:
if bits:
bit_x = pix_x
for i in range(15, -1, -1):
mask = 0x0001 << i
if bits & mask:
self.set_pixel(bit_x, pix_y)
bit_x += 1
pix_y += 1
def write_text(self, x, y, data):
if x + len(data) > 16:
data = data[:16 - min(x, 16)]
pix_x = x*8
pix_y = y*16
for c in data:
c_idx = ord(c) & 0xFF
if c_idx in self.EMPTY_CHAR:
# Empty char
pix_x += 8
continue
char = CHAR_SET[c_idx]
bit_y = pix_y
for bits in char:
if bits:
bit_x = pix_x
for i in range(7, -1, -1):
mask = 0x01 << i
if bits & mask:
self.set_pixel(bit_x, bit_y)
bit_x += 1
bit_y += 1
pix_x += 8
def write_graphics(self, x, y, row, data):
if x + len(data) > 16:
data = data[:16 - min(x, 16)]
pix_x = x*8
pix_y = y*16 + row
for bits in data:
for i in range(7, -1, -1):
mask = 0x01 << i
if bits & mask:
self.set_pixel(pix_x, pix_y)
pix_x += 1
def clear(self):
zeros = bytearray(128)
for page in self.vram[self.CURRENT_BUF]:
page[:] = zeros
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