Merge pull request #80 from clach04/issue_77_cyd

Sunton ESP32-2432S028 aka CYD setup support - implements #77

setup_examples/ili9341_esp32_cyd.py

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+# color_setup.py Customise for your hardware config
+
+# Released under the MIT License (MIT). See LICENSE.
+# Copyright (c) 2020 Peter Hinch
+
+# As written, supports:
+# ili9341 240x320 displays on Sunton ESP32-2432S028, also known as CYD
+# See https://github.com/witnessmenow/ESP32-Cheap-Yellow-Display/ for more details
+# Edit the driver import for other displays.
+
+# Demo of initialisation procedure designed to minimise risk of memory fail
+# when instantiating the frame buffer. The aim is to do this as early as
+# possible before importing other modules.
+
+# WIRING
+# ESP   SSD
+# 3v3   Vin
+# Gnd   Gnd
+# IO02  DC
+# IO15  CS
+# IO15  Rst
+# IO14  CLK  Hardware SPI1
+# IO13  DATA (AKA SI MOSI)
+
+from machine import Pin, PWM, SPI
+import gc
+
+# *** Choose your color display driver here ***
+# ili9341 specific driver
+from drivers.ili93xx.ili9341 import ILI9341 as SSD
+
+PIN_sck = 14
+PIN_mosi = 13
+# miso - doesn't need to be explictly set
+PIN_dc = 2
+PIN_cs = 15
+PIN_rst = 15
+
+
+pdc = Pin(PIN_dc, Pin.OUT, value=0)  # Arbitrary pins
+pcs = Pin(PIN_cs, Pin.OUT, value=1)
+prst = Pin(PIN_rst, Pin.OUT, value=1)
+
+# Kept as ssd to maintain compatability
+gc.collect()  # Precaution before instantiating framebuf
+#spi = SPI(1, 40_000_000, sck=Pin(PIN_sck), mosi=Pin(PIN_mosi))  # default miso. 40Mhz out of spec but seems to work fine
+spi = SPI(1, 10_000_000, sck=Pin(PIN_sck), mosi=Pin(PIN_mosi))  # default miso
+
+
+# NOTE on CYD1 clock is upside down.
+# With power usb bottom right from front, clock is bottom right hand and upside down
+# setting usd to True will correct this
+# For more information see https://github.com/peterhinch/micropython-nano-gui/blob/master/DRIVERS.md#32-drivers-for-ili9341
+# TODO for CYD2 probably need to pass in height=320, width=240 (i.e. transposed compared with default and CYD1)
+usd = False  # Default
+usd = True
+
+ssd = SSD(spi, dc=pdc, cs=pcs, rst=prst, usd=usd)
+
+# on CYD need to turn on backlight to see anything
+backlight_percentage = 50
+backlight = Pin(21, Pin.OUT)
+backlight_pwm = PWM(backlight)
+#backlight.on()  # PWM preferred instead of on/off
+#backlight_pwm.duty(1023)  # 100%
+#backlight_pwm.duty(512)  # 50%
+# TODO ensure backlight_percentage is 0-100
+backlight_pwm.duty(int(backlight_percentage * 10.23))  # 1023 / 100