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ili9341.py
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# ILI9341 nano-gui driver for ili9341 displays
# Copyright (c) Peter Hinch 2020-2024
# Released under the MIT license see LICENSE
# This work is based on the following sources.
# https://github.com/rdagger/micropython-ili9341
# Also this forum thread with ideas from @minyiky:
# https://forum.micropython.org/viewtopic.php?f=18&t=9368
from time import sleep_ms
import gc
import framebuf
import asyncio
from drivers.boolpalette import BoolPalette
# Output RGB565 format, 16 bit/pixel:
# g4 g3 g2 b7 b6 b5 b4 b3 r7 r6 r5 r4 r3 g7 g6 g5
# ~80μs on RP2 @ 250MHz.
@micropython.viper
def _lcopy(dest: ptr16, source: ptr8, lut: ptr16, length: int, gscale: bool):
# rgb565 - 16bit/pixel
n: int = 0
x: int = 0
while length:
c = source[x]
p = c >> 4 # current pixel
q = c & 0x0F # next pixel
if gscale:
dest[n] = p >> 1 | p << 4 | p << 9 | ((p & 0x01) << 15)
n += 1
dest[n] = q >> 1 | q << 4 | q << 9 | ((q & 0x01) << 15)
else:
dest[n] = lut[p] # current pixel
n += 1
dest[n] = lut[q] # next pixel
n += 1
x += 1
length -= 1
class ILI9341(framebuf.FrameBuffer):
lut = bytearray(32)
# Convert r, g, b in range 0-255 to a 16 bit colour value
# LS byte goes into LUT offset 0, MS byte into offset 1
# Same mapping in linebuf so LS byte is shifted out 1st
# ILI9341 expects RGB order
@staticmethod
def rgb(r, g, b):
return (r & 0xF8) | (g & 0xE0) >> 5 | (g & 0x1C) << 11 | (b & 0xF8) << 5
# Transpose width & height for landscape mode
def __init__(
self,
spi,
cs,
dc,
rst,
height=240,
width=320,
usd=False,
init_spi=False,
mod=None,
bgr=False,
):
"""For more information see
https://github.com/peterhinch/micropython-nano-gui/blob/master/DRIVERS.md#32-drivers-for-ili9341
"""
self._spi = spi
self._cs = cs
self._dc = dc
self._rst = rst
self.lock_mode = False # If set, user lock is passed to .do_refresh
self.height = height
self.width = width
self._spi_init = init_spi
self._gscale = False # Interpret buffer as index into color LUT
self.mode = framebuf.GS4_HMSB
self.palette = BoolPalette(self.mode)
gc.collect()
buf = bytearray(self.height * self.width // 2)
self.mvb = memoryview(buf)
super().__init__(buf, self.width, self.height, self.mode)
self._linebuf = bytearray(self.width * 2)
# Hardware reset
self._rst(0)
sleep_ms(50)
self._rst(1)
sleep_ms(50)
if self._spi_init: # A callback was passed
self._spi_init(spi) # Bus may be shared
self._lock = asyncio.Lock()
# Send initialization commands
self._wcmd(b"\x01") # SWRESET Software reset
sleep_ms(100)
self._wcd(b"\xcf", b"\x00\xC1\x30") # PWCTRB Pwr ctrl B
self._wcd(b"\xed", b"\x64\x03\x12\x81") # POSC Pwr on seq. ctrl
self._wcd(b"\xe8", b"\x85\x00\x78") # DTCA Driver timing ctrl A
self._wcd(b"\xcb", b"\x39\x2C\x00\x34\x02") # PWCTRA Pwr ctrl A
self._wcd(b"\xf7", b"\x20") # PUMPRC Pump ratio control
self._wcd(b"\xea", b"\x00\x00") # DTCB Driver timing ctrl B
self._wcd(b"\xc0", b"\x23") # PWCTR1 Pwr ctrl 1
self._wcd(b"\xc1", b"\x10") # PWCTR2 Pwr ctrl 2
self._wcd(b"\xc5", b"\x3E\x28") # VMCTR1 VCOM ctrl 1
self._wcd(b"\xc7", b"\x86") # VMCTR2 VCOM ctrl 2
if mod is None:
if self.height > self.width:
v = 0x40 if usd else 0x80 # MADCTL: BGR portrait mode
else:
v = 0x20 if usd else 0xE0 # MADCTL: BGR landscape mode
else: # Weird Chinese display
if not 0 <= mod <= 7:
raise ValueError("mod must be in range 0 to 7")
v = mod << 5
v = v if bgr else (v | 8)
self._wcd(b"\x36", int.to_bytes(v, 1, "big"))
self._wcd(b"\x37", b"\x00") # VSCRSADD Vertical scrolling start address
self._wcd(b"\x3a", b"\x55") # PIXFMT COLMOD: Pixel format 16 bits (MCU & interface)
self._wcd(b"\xb1", b"\x00\x18") # FRMCTR1 Frame rate ctrl
self._wcd(b"\xb6", b"\x08\x82\x27") # DFUNCTR
self._wcd(b"\xf2", b"\x00") # ENABLE3G Enable 3 gamma ctrl
self._wcd(b"\x26", b"\x01") # GAMMASET Gamma curve selected
# GMCTRP1
self._wcd(b"\xe0", b"\x0F\x31\x2B\x0C\x0E\x08\x4E\xF1\x37\x07\x10\x03\x0E\x09\x00")
# GMCTRN1
self._wcd(b"\xe1", b"\x00\x0E\x14\x03\x11\x07\x31\xC1\x48\x08\x0F\x0C\x31\x36\x0F")
self._wcmd(b"\x11") # SLPOUT Exit sleep
sleep_ms(100)
self._wcmd(b"\x29") # DISPLAY_ON
sleep_ms(100)
# Write a command.
def _wcmd(self, buf):
self._dc(0)
self._cs(0)
self._spi.write(buf)
self._cs(1)
# Write a command followed by a data arg.
def _wcd(self, command, data):
self._dc(0)
self._cs(0)
self._spi.write(command)
self._cs(1)
self._dc(1)
self._cs(0)
self._spi.write(data)
self._cs(1)
def greyscale(self, gs=None):
if gs is not None:
self._gscale = gs
return self._gscale
# Time (ESP32 stock freq) 196ms portrait, 185ms landscape.
# mem free on ESP32 43472 bytes (vs 110192)
@micropython.native
def show(self):
clut = ILI9341.lut
wd = self.width // 2
ht = self.height
cm = self._gscale # color False, greyscale True
lb = self._linebuf
buf = self.mvb
if self._spi_init: # A callback was passed
self._spi_init(self._spi) # Bus may be shared
# Commands needed to start data write
self._wcd(b"\x2a", int.to_bytes(self.width, 4, "big")) # SET_COLUMN
self._wcd(b"\x2b", int.to_bytes(ht, 4, "big")) # SET_PAGE
self._wcmd(b"\x2c") # WRITE_RAM
self._dc(1)
self._cs(0)
for start in range(0, wd * ht, wd): # For each line
_lcopy(lb, buf[start:], clut, wd, cm) # Copy and map colors
self._spi.write(lb)
self._cs(1)
def short_lock(self, v=None):
if v is not None:
self.lock_mode = v # If set, user lock is passed to .do_refresh
return self.lock_mode
# nanogui apps typically call with no args. ugui and tgui pass split and
# may pass a Lock depending on lock_mode
async def do_refresh(self, split=4, elock=None):
if elock is None:
elock = asyncio.Lock()
async with self._lock:
lines, mod = divmod(self.height, split) # Lines per segment
if mod:
raise ValueError("Invalid do_refresh arg.")
clut = ILI9341.lut
wd = self.width // 2
ht = self.height
cm = self._gscale # color False, greyscale True
lb = self._linebuf
buf = self.mvb
# Commands needed to start data write
self._wcd(b"\x2a", int.to_bytes(self.width, 4, "big")) # SET_COLUMN
self._wcd(b"\x2b", int.to_bytes(ht, 4, "big")) # SET_PAGE
self._wcmd(b"\x2c") # WRITE_RAM
self._dc(1)
line = 0
for _ in range(split): # For each segment
async with elock:
if self._spi_init: # A callback was passed
self._spi_init(self._spi) # Bus may be shared
self._cs(0)
for start in range(wd * line, wd * (line + lines), wd): # For each line
_lcopy(lb, buf[start:], clut, wd, cm) # Copy and map colors
self._spi.write(lb)
line += lines
self._cs(1) # Allow other tasks to use bus
await asyncio.sleep_ms(0)