Trying to get ESP32-S3 Reverse TFT to work in MicroPython

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MakerAL
 
Posts: 4
Joined: Thu Mar 16, 2023 11:56 pm

Trying to get ESP32-S3 Reverse TFT to work in MicroPython

Post by MakerAL »

This is the product I am testing: https://learn.adafruit.com/esp32-s3-reverse-tft-feather

I am trying to get the TFT demo to working in MicroPython, all I got is a blank screen. (I've installed MicroPython and mounted CIRCUITPY correctly and was able to get other demos to work. I am only having issues with the TFT)

I have these libraries under the /lib
adafruit_display_text/
adafruit_bitmap_front/
adafruit_st7789.mpy

Can anyone provide some insights?

Code: Select all

# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT

"""
This test will initialize the display using displayio and draw a solid green
background, a smaller purple rectangle, and some yellow text.
"""
import board
import terminalio
import displayio
import digitalio
from adafruit_display_text import label
from adafruit_st7789 import ST7789

# First set some parameters used for shapes and text
BORDER = 20
FONTSCALE = 2
BACKGROUND_COLOR = 0x00FF00  # Bright Green
FOREGROUND_COLOR = 0xAA0088  # Purple
TEXT_COLOR = 0xFFFF00

# Release any resources currently in use for the displays
displayio.release_displays()

spi = board.SPI()
tft_cs = board.TFT_CS
tft_dc = board.TFT_DC

display_bus = displayio.FourWire(spi, command=tft_dc, chip_select=tft_cs)
display = ST7789(
    display_bus, rotation=270, width=240, height=135, rowstart=40, colstart=53
)

# Make the display context
splash = displayio.Group()
display.show(splash)

color_bitmap = displayio.Bitmap(display.width, display.height, 1)
color_palette = displayio.Palette(1)
color_palette[0] = BACKGROUND_COLOR

bg_sprite = displayio.TileGrid(color_bitmap, pixel_shader=color_palette, x=0, y=0)
splash.append(bg_sprite)

# Draw a smaller inner rectangle
inner_bitmap = displayio.Bitmap(
    display.width - BORDER * 2, display.height - BORDER * 2, 1
)
inner_palette = displayio.Palette(1)
inner_palette[0] = FOREGROUND_COLOR
inner_sprite = displayio.TileGrid(
    inner_bitmap, pixel_shader=inner_palette, x=BORDER, y=BORDER
)
splash.append(inner_sprite)

# Draw a label
text = "Hello World!"
text_area = label.Label(terminalio.FONT, text=text, color=TEXT_COLOR)
text_width = text_area.bounding_box[2] * FONTSCALE
text_group = displayio.Group(
    scale=FONTSCALE,
    x=display.width // 2 - text_width // 2,
    y=display.height // 2,
)
text_group.append(text_area)  # Subgroup for text scaling
splash.append(text_group)

while True:
    pass
The sample code is from here:

https://learn.adafruit.com/adafruit-1-1 ... quickstart

I modified the PINs as follow for this board:

Code: Select all

tft_cs = board.TFT_CS
tft_dc = board.TFT_DC

User avatar
MakerAL
 
Posts: 4
Joined: Thu Mar 16, 2023 11:56 pm

Re: Trying to get ESP32-S3 Reverse TFT to work in MicroPython

Post by MakerAL »

Answering my own questions, it works after adding the following code:

Code: Select all

# Set TFT_BACKLIGHT pin to high
backlight = digitalio.DigitalInOut(board.TFT_BACKLIGHT)
backlight.switch_to_output()
backlight.value = True
Enjoy

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