258 lines
11 KiB
Python
258 lines
11 KiB
Python
# Support for ST7920 (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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#
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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 .. import bus
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from . import font8x14
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BACKGROUND_PRIORITY_CLOCK = 0x7fffffff00000000
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# Spec says 72us, but faster is possible in practice
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ST7920_CMD_DELAY = .000020
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ST7920_SYNC_DELAY = .000045
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TextGlyphs = { 'right_arrow': '\x1a' }
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CharGlyphs = { 'degrees': bytearray(font8x14.VGA_FONT[0xf8]) }
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class DisplayBase:
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def __init__(self):
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# framebuffers
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self.text_framebuffer = bytearray(' '*64)
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self.glyph_framebuffer = bytearray(128)
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self.graphics_framebuffers = [bytearray(32) for i in range(32)]
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self.all_framebuffers = [
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# Text framebuffer
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(self.text_framebuffer, bytearray('~'*64), 0x80),
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# Glyph framebuffer
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(self.glyph_framebuffer, bytearray('~'*128), 0x40),
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# Graphics framebuffers
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] + [(self.graphics_framebuffers[i], bytearray('~'*32), i)
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for i in range(32)]
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self.cached_glyphs = {}
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self.icons = {}
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def flush(self):
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# Find all differences in the framebuffers and send them to the chip
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for new_data, old_data, fb_id in self.all_framebuffers:
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if new_data == old_data:
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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, (n, o) in enumerate(zip(new_data, old_data))
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if n != o]
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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 changes
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for pos, count in diffs:
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count += pos & 0x01
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count += count & 0x01
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pos = pos & ~0x01
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chip_pos = pos >> 1
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if fb_id < 0x40:
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# Graphics framebuffer update
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self.send([0x80 + fb_id, 0x80 + chip_pos], is_extended=True)
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else:
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self.send([fb_id + chip_pos])
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self.send(new_data[pos:pos+count], is_data=True)
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old_data[:] = new_data
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def init(self):
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cmds = [0x24, # Enter extended mode
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0x40, # Clear vertical scroll address
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0x02, # Enable CGRAM access
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0x26, # Enable graphics
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0x22, # Leave extended mode
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0x02, # Home the display
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0x06, # Set positive update direction
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0x0c] # Enable display and hide cursor
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self.send(cmds)
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self.flush()
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def cache_glyph(self, glyph_name, base_glyph_name, glyph_id):
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icon = self.icons.get(glyph_name)
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base_icon = self.icons.get(base_glyph_name)
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if icon is None or base_icon is None:
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return
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all_bits = zip(icon[0], icon[1], base_icon[0], base_icon[1])
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for i, (ic1, ic2, b1, b2) in enumerate(all_bits):
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x1, x2 = ic1 ^ b1, ic2 ^ b2
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pos = glyph_id*32 + i*2
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self.glyph_framebuffer[pos:pos+2] = [x1, x2]
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self.all_framebuffers[1][1][pos:pos+2] = [x1 ^ 1, x2 ^ 1]
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self.cached_glyphs[glyph_name] = (base_glyph_name, (0, glyph_id*2))
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def set_glyphs(self, glyphs):
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for glyph_name, glyph_data in glyphs.items():
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icon = glyph_data.get('icon16x16')
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if icon is not None:
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self.icons[glyph_name] = icon
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# Setup animated glyphs
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self.cache_glyph('fan2', 'fan1', 0)
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self.cache_glyph('bed_heat2', 'bed_heat1', 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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pos = [0, 32, 16, 48][y] + x
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self.text_framebuffer[pos:pos+len(data)] = data
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def write_graphics(self, x, y, data):
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if x >= 16 or y >= 4 or len(data) != 16:
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return
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gfx_fb = y * 16
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if gfx_fb >= 32:
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gfx_fb -= 32
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x += 16
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for i, bits in enumerate(data):
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self.graphics_framebuffers[gfx_fb + i][x] = bits
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def write_glyph(self, x, y, glyph_name):
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glyph_id = self.cached_glyphs.get(glyph_name)
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if glyph_id is not None and x & 1 == 0:
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# Render cached icon using character generator
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glyph_name = glyph_id[0]
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self.write_text(x, y, glyph_id[1])
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icon = self.icons.get(glyph_name)
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if icon is not None:
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# Draw icon in graphics mode
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self.write_graphics(x, y, icon[0])
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self.write_graphics(x + 1, y, icon[1])
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return 2
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char = TextGlyphs.get(glyph_name)
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if char is not None:
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# Draw character
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self.write_text(x, y, char)
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return 1
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font = CharGlyphs.get(glyph_name)
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if font is not None:
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# Draw single width character
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self.write_graphics(x, y, font)
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return 1
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return 0
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def clear(self):
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self.text_framebuffer[:] = ' '*64
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zeros = bytearray(32)
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for gfb in self.graphics_framebuffers:
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gfb[:] = zeros
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def get_dimensions(self):
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return (16, 4)
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# Display driver for stock ST7920 displays
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class ST7920(DisplayBase):
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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', 'sclk', 'sid']]
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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("st7920 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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# prepare send functions
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self.mcu = mcu
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self.oid = self.mcu.create_oid()
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self.mcu.register_config_callback(self.build_config)
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self.send_data_cmd = self.send_cmds_cmd = None
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self.is_extended = False
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# init display base
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DisplayBase.__init__(self)
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def build_config(self):
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# configure send functions
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self.mcu.add_config_cmd(
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"config_st7920 oid=%u cs_pin=%s sclk_pin=%s sid_pin=%s"
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" sync_delay_ticks=%d cmd_delay_ticks=%d" % (
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self.oid, self.pins[0], self.pins[1], self.pins[2],
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self.mcu.seconds_to_clock(ST7920_SYNC_DELAY),
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self.mcu.seconds_to_clock(ST7920_CMD_DELAY)))
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cmd_queue = self.mcu.alloc_command_queue()
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self.send_cmds_cmd = self.mcu.lookup_command(
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"st7920_send_cmds oid=%c cmds=%*s", cq=cmd_queue)
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self.send_data_cmd = self.mcu.lookup_command(
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"st7920_send_data oid=%c data=%*s", cq=cmd_queue)
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def send(self, cmds, is_data=False, is_extended=False):
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cmd_type = self.send_cmds_cmd
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if is_data:
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cmd_type = self.send_data_cmd
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elif self.is_extended != is_extended:
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add_cmd = 0x22
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if is_extended:
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add_cmd = 0x26
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cmds = [add_cmd] + cmds
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self.is_extended = is_extended
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cmd_type.send([self.oid, cmds], reqclock=BACKGROUND_PRIORITY_CLOCK)
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#logging.debug("st7920 %d %s", is_data, repr(cmds))
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# Helper code for toggling the en pin on startup
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class EnableHelper:
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def __init__(self, pin_desc, spi):
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self.en_pin = bus.MCU_bus_digital_out(spi.get_mcu(), pin_desc,
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spi.get_command_queue())
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def init(self):
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mcu = self.en_pin.get_mcu()
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curtime = mcu.get_printer().get_reactor().monotonic()
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print_time = mcu.estimated_print_time(curtime)
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# Toggle enable pin
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minclock = mcu.print_time_to_clock(print_time + .100)
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self.en_pin.update_digital_out(0, minclock=minclock)
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minclock = mcu.print_time_to_clock(print_time + .200)
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self.en_pin.update_digital_out(1, minclock=minclock)
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# Force a delay to any subsequent commands on the command queue
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minclock = mcu.print_time_to_clock(print_time + .300)
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self.en_pin.update_digital_out(1, minclock=minclock)
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# Display driver for displays that emulate the ST7920 in software.
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# These displays rely on the CS pin to be toggled in order to initialize the
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# SPI correctly. This display driver uses a software SPI with an unused pin
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# as the MISO pin.
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class EmulatedST7920(DisplayBase):
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def __init__(self, config):
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# create software spi
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ppins = config.get_printer().lookup_object('pins')
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sw_pin_names = ['spi_software_%s_pin' % (name,)
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for name in ['miso', 'mosi', 'sclk']]
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sw_pin_params = [ppins.lookup_pin(config.get(name), share_type=name)
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for name in sw_pin_names]
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mcu = None
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for pin_params in sw_pin_params:
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if mcu is not None and pin_params['chip'] != mcu:
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raise ppins.error("%s: spi pins must be on same mcu" % (
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config.get_name(),))
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mcu = pin_params['chip']
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sw_pins = tuple([pin_params['pin'] for pin_params in sw_pin_params])
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speed = config.getint('spi_speed', 1000000, minval=100000)
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self.spi = bus.MCU_SPI(mcu, None, None, 0, speed, sw_pins)
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# create enable helper
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self.en_helper = EnableHelper(config.get("en_pin"), self.spi)
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self.en_set = False
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# init display base
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self.is_extended = False
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DisplayBase.__init__(self)
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def send(self, cmds, is_data=False, is_extended=False):
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# setup sync byte and check for exten mode switch
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sync_byte = 0xfa
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if not is_data:
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sync_byte = 0xf8
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if self.is_extended != is_extended:
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add_cmd = 0x22
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if is_extended:
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add_cmd = 0x26
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cmds = [add_cmd] + cmds
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self.is_extended = is_extended
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# copy data to ST7920 data format
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spi_data = [0] * (2 * len(cmds) + 1)
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spi_data[0] = sync_byte
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i = 1
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for b in cmds:
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spi_data[i] = b & 0xF0
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spi_data[i + 1] = (b & 0x0F) << 4
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i = i + 2
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# check if enable pin has been set
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if not self.en_set:
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self.en_helper.init()
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self.en_set = True
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# send data
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self.spi.spi_send(spi_data, reqclock=BACKGROUND_PRIORITY_CLOCK)
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#logging.debug("st7920 %s", repr(spi_data))
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