display: add UC1701 graphics controller support

Signed-off-by: Eric Callahan <arksine.code@gmail.com>

1 files changed, 180 insertions, 0 deletions

diff --git a/klippy/extras/display/uc1701.py b/klippy/extras/display/uc1701.py
new file mode 100644
index 00000000..b579f200
--- /dev/null
+++ b/klippy/extras/display/uc1701.py
@@ -0,0 +1,180 @@
+# 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.cs_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_without_cs oid=%d bus=%d mode=%d rate=%d shutdown_msg=" % (
+                self.spi_oid, 0, 0, 4000000))
+        self.mcu.add_config_cmd(
+            "config_digital_out oid=%d pin=%s value=%d default_value=%d max_duration=%d" % (
+                self.cs_oid, self.pins[0], 1, 1, 0))
+        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):
+        self.update_pin_cmd.send([self.cs_oid, 0], reqclock=BACKGROUND_PRIORITY_CLOCK)
+        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)
+        self.update_pin_cmd.send([self.cs_oid, 1], 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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