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105 lines
3.8 KiB
Python
105 lines
3.8 KiB
Python
8 months ago
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"""ILI9341 demo (SD Card with touchscreen demo).
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The Micropython Machine SDCard library can cause conflicts with the ILI9341.
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Therefore, I'm using micropython-lib sdcard.py to control the SD Card.
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https://github.com/micropython/micropython-lib/tree/master/micropython/drivers/storage/sdcard
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The SD Card should be set to the same SPI bus as the touchscreen because they
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both run at slower speeds. The display should be run on it's own SPI bus to
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take advantage of the higher bandwidth.
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If your board has a built-in SD card then you will want to identify what GPIO
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pins and what SPI bus it uses. This demo was tested using a Lolin 32 Pro
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which uses bus 1 (HSPI) for the SD card and GPIO pin 13 for CS. Therefore,
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the SD Card and the touch screen will share HSPI and the display will be on
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VSPI.
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Demo requires the Python41x49.raw image to be copied to the SD card. The
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SD card should be formatted to Fat32.
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"""
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from ili9341 import Display, color565
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from xpt2046 import Touch
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from machine import idle, Pin, SPI # type: ignore
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from sdcard import SDCard
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import os
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class Demo(object):
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"""SD Card with touchscreen demo."""
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CYAN = color565(0, 255, 255)
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PURPLE = color565(255, 0, 255)
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WHITE = color565(255, 255, 255)
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def __init__(self, display, spi2):
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"""Initialize box.
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Args:
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display (ILI9341): display object
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spi2 (SPI): SPI bus
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Notes:
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Some ILI9341's require touchscreen width & height to be swapped
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when the Touch class is initialized.
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"""
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self.display = display
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self.touch = Touch(spi2, cs=Pin(5), int_pin=Pin(0),
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int_handler=self.touchscreen_press,
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width=240, height=320)
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# Display initial message
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self.display.draw_text8x8(self.display.width // 2 - 32,
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self.display.height - 9,
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"TOUCH ME",
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self.WHITE,
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background=self.PURPLE)
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def touchscreen_press(self, x, y):
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"""Process touchscreen press events."""
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# x, y = y, x # Some screens require swapping X and Y
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# x = (self.display.width - 1) - x # Some screens require flipping X
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y = (self.display.height - 1) - y # Some screens require flipping Y
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# Display coordinates
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self.display.draw_text8x8(self.display.width // 2 - 32,
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self.display.height - 9,
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"{0:03d}, {1:03d}".format(x, y),
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self.CYAN)
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# Draw image from SD Card
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try:
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x -= 20 # Image center X
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y -= 25 # Image center Y
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x = max(x, 41)
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x = min(x, self.display.width - 42)
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y = max(y, 49)
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y = min(y, self.display.height - 50)
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self.display.draw_image('sd/Python41x49.raw', x, y, 41, 49)
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except OSError as e:
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print("Error:", e)
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def test():
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"""Test code."""
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# Initialize SPI bus for touch screen & built-in SD card (bus must match).
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spi1 = SPI(1, baudrate=1000000, sck=Pin(14), mosi=Pin(15), miso=Pin(2))
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# Initialize and mount SD card
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sd_cs = Pin(13) # When using an internal SD card, ensure CS matches.
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sd = SDCard(spi1, sd_cs)
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os.mount(sd, '/sd')
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# Initialize SPI bus for display
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spi2 = SPI(2, baudrate=40000000, sck=Pin(18), mosi=Pin(23), miso=Pin(19))
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display = Display(spi2, dc=Pin(22), cs=Pin(19), rst=Pin(21))
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Demo(display, spi1)
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try:
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while True:
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idle()
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except KeyboardInterrupt:
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print("\nCtrl-C pressed. Cleaning up and exiting...")
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finally:
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display.cleanup() # Clean up display
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os.umount('/sd') # Unmount SD card
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test()
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