173 lines
7.0 KiB
Python
173 lines
7.0 KiB
Python
# Support for UC1701 (128x64 graphics) LCD displays
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#
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# Copyright (C) 2018 Kevin O'Connor <kevin@koconnor.net>
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# Copyright (C) 2018 Eric Callahan <arksine.code@gmail.com>
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#
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# This file may be distributed under the terms of the GNU GPLv3 license.
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import logging
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from font8x14 import VGA_FONT as CHAR_SET
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BACKGROUND_PRIORITY_CLOCK = 0x7fffffff00000000
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class UC1701:
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char_right_arrow = '\x1a'
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CURRENT_BUF, OLD_BUF = 0, 1
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EMPTY_CHAR = (0, 32, 255)
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def __init__(self, config):
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printer = config.get_printer()
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# pin config
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ppins = printer.lookup_object('pins')
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pins = [ppins.lookup_pin(config.get(name + '_pin'))
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for name in ['cs','a0']]
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mcu = None
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for pin_params in pins:
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if mcu is not None and pin_params['chip'] != mcu:
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raise ppins.error("uc1701 all pins must be on same mcu")
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mcu = pin_params['chip']
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self.pins = [pin_params['pin'] for pin_params in pins]
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self.mcu = mcu
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self.spi_oid = self.mcu.create_oid()
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self.a0_oid = self.mcu.create_oid()
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self.mcu.add_config_object(self)
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self.glyph_buffer = []
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self.spi_xfer_cmd = self.set_pin_cmd = None
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self.vram = ([bytearray(128) for i in range(8)],
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[bytearray('~'*128) for i in range(8)])
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def build_config(self):
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self.mcu.add_config_cmd(
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"config_spi oid=%d bus=%d pin=%s mode=%d rate=%d shutdown_msg=" % (
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self.spi_oid, 0, self.pins[0], 0, 10000000))
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self.mcu.add_config_cmd(
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"config_digital_out oid=%d pin=%s value=%d default_value=%d max_duration=%d" % (
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self.a0_oid, self.pins[1], 0, 0, 0))
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cmd_queue = self.mcu.alloc_command_queue()
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self.spi_send_cmd = self.mcu.lookup_command(
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"spi_send oid=%c data=%*s", cq=cmd_queue)
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self.update_pin_cmd = self.mcu.lookup_command(
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"update_digital_out oid=%c value=%c", cq=cmd_queue)
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def send(self, cmds, is_data=False):
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if is_data:
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self.update_pin_cmd.send([self.a0_oid, 1], reqclock=BACKGROUND_PRIORITY_CLOCK)
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else:
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self.update_pin_cmd.send([self.a0_oid, 0], reqclock=BACKGROUND_PRIORITY_CLOCK)
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self.spi_send_cmd.send([self.spi_oid, cmds], reqclock=BACKGROUND_PRIORITY_CLOCK)
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def init(self):
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init_cmds = [0xE2, # System reset
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0x40, # Set display to start at line 0
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0xA0, # Set SEG direction
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0xC8, # Set COM Direction
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0xA2, # Set Bias = 1/9
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0x2C, # Boost ON
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0x2E, # Voltage regulator on
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0x2F, # Voltage follower on
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0xF8, # Set booster ratio
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0x00, # Booster ratio value (4x)
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0x23, # Set resistor ratio (3)
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0x81, # Set Electronic Volume
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0x28, # Electronic volume value (40)
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0xAC, # Set static indicator off
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0x00, # NOP
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0xA6, # Disable Inverse
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0xAF] # Set display enable
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self.send(init_cmds)
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self.send([0xA5]) # display all
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self.send([0xA4]) # normal display
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self.flush()
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logging.info("uc1701 initialized")
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def flush(self):
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new_data = self.vram[self.CURRENT_BUF]
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old_data = self.vram[self.OLD_BUF]
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for page in range(8):
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if new_data[page] == old_data[page]:
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continue
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# Find the position of all changed bytes in this framebuffer
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diffs = [[i, 1] for i, (nd, od) in enumerate(zip(new_data[page], old_data[page]))
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if nd != od]
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# Batch together changes that are close to each other
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for i in range(len(diffs)-2, -1, -1):
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pos, count = diffs[i]
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nextpos, nextcount = diffs[i+1]
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if pos + 5 >= nextpos and nextcount < 16:
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diffs[i][1] = nextcount + (nextpos - pos)
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del diffs[i+1]
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# Transmit
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for col_pos, count in diffs:
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# Set Position registers
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ra = 0xb0 | (page & 0x0F)
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ca_msb = 0x10 | ((col_pos >> 4) & 0x0F)
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ca_lsb = col_pos & 0x0F
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self.send([ra, ca_msb, ca_lsb])
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# Send Data
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self.send(new_data[page][col_pos:col_pos+count], is_data=True)
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old_data[page][:] = new_data[page]
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def set_pixel(self, pix_x, pix_y, exclusive=True):
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page_idx = pix_y // 8
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page_byte = 0x01 << (pix_y % 8)
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if exclusive and self.vram[self.CURRENT_BUF][page_idx][pix_x] & page_byte:
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#invert pixel if it has alread been set
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self.vram[self.CURRENT_BUF][page_idx][pix_x] &= ~page_byte
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else:
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#set the correct pixel in the vram buffer to 1
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self.vram[self.CURRENT_BUF][page_idx][pix_x] |= page_byte
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def clear_pixel(self, pix_x, pix_y):
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page_idx = pix_y // 8
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page_byte = ~(0x01 << (pix_y % 8))
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#set the correct pixel in the vram buffer to 0
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self.vram[self.CURRENT_BUF][page_idx][pix_x] &= page_byte
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def load_glyph(self, glyph_id, data):
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if len(data) > 16:
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data = data[:16]
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self.glyph_buffer.append((glyph_id, data))
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self.glyph_buffer.sort(key=lambda x: x[0])
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def write_glyph(self, x, y, glyph_id):
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pix_x = x*8
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pix_y = y*16
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data = self.glyph_buffer[glyph_id][1]
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for bits in data:
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if bits:
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bit_x = pix_x
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for i in range(15, -1, -1):
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mask = 0x0001 << i
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if bits & mask:
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self.set_pixel(bit_x, pix_y)
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bit_x += 1
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pix_y += 1
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def write_text(self, x, y, data):
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if x + len(data) > 16:
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data = data[:16 - min(x, 16)]
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pix_x = x*8
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pix_y = y*16
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for c in data:
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c_idx = ord(c) & 0xFF
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if c_idx in self.EMPTY_CHAR:
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# Empty char
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pix_x += 8
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continue
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char = CHAR_SET[c_idx]
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bit_y = pix_y
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for bits in char:
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if bits:
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bit_x = pix_x
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for i in range(7, -1, -1):
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mask = 0x01 << i
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if bits & mask:
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self.set_pixel(bit_x, bit_y)
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bit_x += 1
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bit_y += 1
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pix_x += 8
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def write_graphics(self, x, y, row, data):
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if x + len(data) > 16:
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data = data[:16 - min(x, 16)]
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pix_x = x*8
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pix_y = y*16 + row
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for bits in data:
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for i in range(7, -1, -1):
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mask = 0x01 << i
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if bits & mask:
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self.set_pixel(pix_x, pix_y)
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pix_x += 1
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def clear(self):
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zeros = bytearray(128)
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for page in self.vram[self.CURRENT_BUF]:
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page[:] = zeros
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