Screen glitch on refresh on qualia ESP32S3 with TL021WVC02CT round display #10690
Description
CircuitPython version and board name
Adafruit CircuitPython 10.0.3 on 2025-10-17; Adafruit-Qualia-S3-RGB666 with ESP32S3Code/REPL
import board
import busio
import displayio
import time
from adafruit_display_shapes.line import Line
import dotclockframebuffer #type:ignore
from framebufferio import FramebufferDisplay #type:ignore
displayio.release_displays()
# Init code copied from https://learn.adafruit.com/adafruit-qualia-esp32-s3-for-rgb666-displays/qualia-rgb666-with-2-1-round-480x480-display
init_sequence_tl021wvc02 = bytes((
0xff, 0x05, 0x77, 0x01, 0x00, 0x00, 0x10,
0xc0, 0x02, 0x3b, 0x00,
0xc1, 0x02, 0x0b, 0x02,
0xc2, 0x02, 0x00, 0x02,
0xcc, 0x01, 0x10,
0xcd, 0x01, 0x08,
0xb0, 0x10, 0x02, 0x13, 0x1b, 0x0d, 0x10, 0x05, 0x08, 0x07, 0x07, 0x24, 0x04, 0x11, 0x0e, 0x2c, 0x33, 0x1d,
0xb1, 0x10, 0x05, 0x13, 0x1b, 0x0d, 0x11, 0x05, 0x08, 0x07, 0x07, 0x24, 0x04, 0x11, 0x0e, 0x2c, 0x33, 0x1d,
0xff, 0x05, 0x77, 0x01, 0x00, 0x00, 0x11,
0xb0, 0x01, 0x5d,
0xb1, 0x01, 0x43,
0xb2, 0x01, 0x81,
0xb3, 0x01, 0x80,
0xb5, 0x01, 0x43,
0xb7, 0x01, 0x85,
0xb8, 0x01, 0x20,
0xc1, 0x01, 0x78,
0xc2, 0x01, 0x78,
0xd0, 0x01, 0x88,
0xe0, 0x03, 0x00, 0x00, 0x02,
0xe1, 0x0b, 0x03, 0xa0, 0x00, 0x00, 0x04, 0xa0, 0x00, 0x00, 0x00, 0x20, 0x20,
0xe2, 0x0d, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xe3, 0x04, 0x00, 0x00, 0x11, 0x00,
0xe4, 0x02, 0x22, 0x00,
0xe5, 0x10, 0x05, 0xec, 0xa0, 0xa0, 0x07, 0xee, 0xa0, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xe6, 0x04, 0x00, 0x00, 0x11, 0x00,
0xe7, 0x02, 0x22, 0x00,
0xe8, 0x10, 0x06, 0xed, 0xa0, 0xa0, 0x08, 0xef, 0xa0, 0xa0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xeb, 0x07, 0x00, 0x00, 0x40, 0x40, 0x00, 0x00, 0x00,
0xed, 0x10, 0xff, 0xff, 0xff, 0xba, 0x0a, 0xbf, 0x45, 0xff, 0xff, 0x54, 0xfb, 0xa0, 0xab, 0xff, 0xff, 0xff,
0xef, 0x06, 0x10, 0x0d, 0x04, 0x08, 0x3f, 0x1f,
0xff, 0x05, 0x77, 0x01, 0x00, 0x00, 0x13,
0xef, 0x01, 0x08,
0xff, 0x05, 0x77, 0x01, 0x00, 0x00, 0x00,
0x36, 0x01, 0x00,
0x3a, 0x01, 0x60,
0x11, 0x80, 0x64,
0x29, 0x80, 0x32,
))
tft_timings = {
"frequency": 16_000_000,
"width": 480,
"height": 480,
"hsync_pulse_width": 20,
"hsync_front_porch": 40,
"hsync_back_porch": 40,
"vsync_pulse_width": 10,
"vsync_front_porch": 40,
"vsync_back_porch": 40,
"hsync_idle_low": False,
"vsync_idle_low": False,
"de_idle_high": False,
"pclk_active_high": True,
"pclk_idle_high": False,
}
board.I2C().deinit()
i2c = busio.I2C(board.SCL, board.SDA) #, frequency=400_000)
tft_io_expander = dict(board.TFT_IO_EXPANDER)
#tft_io_expander['i2c_address'] = 0x38 # uncomment for rev B
dotclockframebuffer.ioexpander_send_init_sequence(i2c, init_sequence_tl021wvc02,
**tft_io_expander)
i2c.deinit()
tft_pins = dict(board.TFT_PINS)
fb = dotclockframebuffer.DotClockFramebuffer(**tft_pins, **tft_timings)
display = FramebufferDisplay(fb, auto_refresh=False)
# User-made code
group = displayio.Group()
display.root_group = group
display.auto_refresh = True
line = Line(x0=0,y0=0,x1=240,y1=240,color=0xFF0000)
while True:
group.append(line)
time.sleep(0.5)
group.pop()
passBehavior
When run, this code display a red diagonal line as expected, but at every refresh, there is a screen flickering/glitch and there is no error message.
Description
The intensity of the bug vary on what is rendered and happen every time. It's seem to be independent from the type of screen has another different display has been tested with similar result.
Additional information
There is nothing mounted on the board except the screen. I've found a temporary solution by retrograding to CircuitPython 9.x which solve the issue.