kopia lustrzana https://github.com/peterhinch/micropython-nano-gui
161 wiersze
6.0 KiB
Python
161 wiersze
6.0 KiB
Python
# SSD1351.py MicroPython driver for Adafruit color OLED displays.
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# STM (Pyboard etc) version. Display refresh takes 41ms on Pyboard V1.0
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# Adafruit 1.5" 128*128 OLED display: https://www.adafruit.com/product/1431
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# Adafruit 1.27" 128*96 display https://www.adafruit.com/product/1673
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# For wiring details see drivers/ADAFRUIT.md in this repo.
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# This driver is based on the Adafruit C++ library for Arduino
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# https://github.com/adafruit/Adafruit-SSD1351-library.git
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# The MIT License (MIT)
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# Copyright (c) 2018 Peter Hinch
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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import framebuf
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import utime
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import gc
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import micropython
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from uctypes import addressof
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# Timings with standard emitter
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# 1.86ms * 128 lines = 240ms. copy dominates: show() took 272ms
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# Buffer transfer time = 272-240 = 32ms which accords with expected:
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# 128*128*2/10500000 = 31.2ms (2 bytes/pixel, baudrate = 10.5MHz)
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# With assembler .show() takes 41ms
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# Copy a buffer with 8 bit rrrgggbb pixels to a buffer of 16 bit pixels.
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@micropython.asm_thumb
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def _lcopy(r0, r1, r2): # r0 dest, r1 source, r2 no. of bytes
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label(LOOP)
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ldrb(r3, [r1, 0]) # Get source byte to r3, r5, r6
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mov(r5, r3)
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mov(r6, r3)
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mov(r4, 3)
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and_(r3, r4)
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mov(r4, 6)
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lsl(r3, r4)
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mov(r4, 0x1c)
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and_(r5, r4)
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mov(r4, 2)
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lsr(r5, r4)
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orr(r3, r5)
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strb(r3, [r0, 0])
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mov(r4, 0xe0)
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and_(r6, r4)
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mov(r4, 3)
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lsr(r6, r4)
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strb(r6, [r0, 1])
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add(r0, 2)
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add(r1, 1)
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sub(r2, 1)
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bne(LOOP)
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# Initialisation commands in cmd_init:
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# 0xfd, 0x12, 0xfd, 0xb1, # Unlock command mode
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# 0xae, # display off (sleep mode)
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# 0xb3, 0xf1, # clock div
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# 0xca, 0x7f, # mux ratio
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# 0xa0, 0x74, # setremap 0x74
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# 0x15, 0, 0x7f, # setcolumn
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# 0x75, 0, 0x7f, # setrow
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# 0xa1, 0, # set display start line
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# 0xa2, 0, # displayoffset
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# 0xb5, 0, # setgpio
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# 0xab, 1, # functionselect: serial interface, internal Vdd regulator
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# 0xb1, 0x32, # Precharge
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# 0xbe, 0x05, # vcommh
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# 0xa6, # normaldisplay
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# 0xc1, 0xc8, 0x80, 0xc8, # contrast abc
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# 0xc7, 0x0f, # Master contrast
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# 0xb4, 0xa0, 0xb5, 0x55, # set vsl (see datasheet re ext circuit)
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# 0xb6, 1, # Precharge 2
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# 0xaf, # Display on
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# SPI baudrate: Pyboard can produce 10.5MHz or 21MHz. Datasheet gives max of 20MHz.
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# Attempt to use 21MHz failed but might work on a PCB or with very short leads.
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class SSD1351(framebuf.FrameBuffer):
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# Convert r, g, b in range 0-255 to an 8 bit colour value
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# acceptable to hardware: rrrgggbb
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@staticmethod
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def rgb(r, g, b):
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return (r & 0xe0) | ((g >> 3) & 0x1c) | (b >> 6)
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def __init__(self, spi, pincs, pindc, pinrs, height=128, width=128):
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if height not in (96, 128):
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raise ValueError('Unsupported height {}'.format(height))
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self.spi = spi
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self.rate = 11000000 # See baudrate note above.
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self.pincs = pincs
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self.pindc = pindc # 1 = data 0 = cmd
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self.height = height # Required by Writer class
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self.width = width
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# Save color mode for use by writer_gui (blit)
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self.mode = framebuf.GS8 # Use 8bit greyscale for 8 bit color.
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gc.collect()
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self.buffer = bytearray(self.height * self.width)
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super().__init__(self.buffer, self.width, self.height, self.mode)
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self.linebuf = bytearray(self.width * 2)
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pinrs(0) # Pulse the reset line
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utime.sleep_ms(1)
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pinrs(1)
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utime.sleep_ms(1)
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# See above comment to explain this allocation-saving gibberish.
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self._write(b'\xfd\x12\xfd\xb1\xae\xb3\xf1\xca\x7f\xa0\x74'\
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b'\x15\x00\x7f\x75\x00\x7f\xa1\x00\xa2\x00\xb5\x00\xab\x01'\
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b'\xb1\x32\xbe\x05\xa6\xc1\xc8\x80\xc8\xc7\x0f'\
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b'\xb4\xa0\xb5\x55\xb6\x01\xaf', 0)
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self.show()
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gc.collect()
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def _write(self, buf, dc):
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self.spi.init(baudrate=self.rate, polarity=1, phase=1)
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self.pincs(1)
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self.pindc(dc)
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self.pincs(0)
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self.spi.write(buf)
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self.pincs(1)
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# Write lines from the framebuf out of order to match the mapping of the
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# SSD1351 RAM to the OLED device.
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def show(self):
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lb = self.linebuf
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buf = self.buffer
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self._write(b'\x5c', 0) # Enable data write
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if self.height == 128:
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for l in range(128):
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l0 = (95 - l) % 128 # 95 94 .. 1 0 127 126 .. 96
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start = l0 * self.width
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_lcopy(lb, addressof(buf) + start, self.width)
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self._write(lb, 1) # Send a line
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else:
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for l in range(128):
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if l < 64:
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start = (63 -l) * self.width # 63 62 .. 1 0
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_lcopy(lb, addressof(buf) + start, self.width)
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self._write(lb, 1) # Send a line
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elif l < 96: # This is daft but I can't get setrow to work
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self._write(lb, 1) # Let RAM counter increase
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else:
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start = (191 - l) * self.width # 127 126 .. 95
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_lcopy(lb, addressof(buf) + start, self.width)
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self._write(lb, 1) # Send a line
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