Ok, this is about the Lilygo T-Panel with a resolution of 460x460 or 480x480. Unfortunately, the documentation is already misleading at this point. I bought the T-Panel Lite, which is still advertised as having a capacitive touchscreen:
In the comments on Github, however, it was made clear that the Lite version does not have a built-in touchscreen.
There are 2 repos of the T-Panel on Github:
Unfortunately, only the first one is linked on the Lilygo website, so I initially tried to get the device to work with a completely incorrect configuration and pinmap.
Even now after numerous attempts, trial and error and minor successes, some basic things are still unclear to me, e.g. the resolution of the display, which according to the website is 460x460 for the T-Panel Lite, but in the code examples on Github the display is initialized with 480x480 - so you just don’t know what is actually correct.
I would therefore like to show my current intermediate status in the hope that someone can contribute something to get the T-Panel (Lite) up and running. Let’s start with what already works:
- The ESP32s3 can be flashed and connected with ESPHome
- WiFi signal and internal temperature can be read out and displayed in HomeAssistant
- The display backlight can be activated and changed between 0% and 100% via a slider in HomeAssistant
- When the display is on, it shows colored pixels that appear and disappear in pulses
And this is my current code:
esphome:
name: lilygo-panel
friendly_name: Lilygo Panel
platformio_options:
#set frequency to 80MHz
board_build.f_flash: 80000000L
board_build.flash_mode: qio
board_build.flash_size: 16MB
#board_build.arduino.memory_type: qio_qspi
esp32:
board: esp32-s3-devkitc-1
variant: esp32s3
flash_size: 16MB
framework:
type: esp-idf
advanced:
ignore_efuse_mac_crc: True
#sdkconfig_options:
#CONFIG_ESP32S3_DEFAULT_CPU_FREQ_240: y
#CONFIG_ESP32S3_DATA_CACHE_64KB: y
#CONFIG_SPIRAM_FETCH_INSTRUCTIONS: y
#CONFIG_SPIRAM_RODATA: y
sdkconfig_options:
CONFIG_ESP32S3_SPIRAM_SUPPORT: y
CONFIG_SPIRAM_CACHE_WORKAROUND: y
CONFIG_ESP32S3_SPIRAM_USE: y
CONFIG_ESP32S3_SPIRAM_SPEED_80M: y
CONFIG_SPIRAM_BANKSWITCH_ENABLE: y
#CONFIG_ESPTOOLPY_FLASHSIZE_16MB: y
CONFIG_ESP32S3_DEFAULT_CPU_FREQ_240: y
logger:
#level: DEBUG
# Enable Home Assistant API
api:
encryption:
key: "xxxxxxxxxxxxxxxxxxxxxxxxxxxx"
ota:
- platform: esphome
password: "xxxxxxxxxxxxxxxxxxxxxxxxxxxx"
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "Lilygo-Panel Fallback Hotspot"
password: "xxxxxxxxxxxxxxxxxxxxxxxxxxxx"
captive_portal:
sensor:
- platform: wifi_signal
name: WLAN Signal
update_interval: 300s
- platform: internal_temperature
name: Interne Temperatur
update_interval: 300s
#psram:
#mode: octal
#speed: 40MHz
output:
- platform: ledc
pin:
number: GPIO33
id: ledc_gpio
# frequency: 100Hz
light:
- platform: monochromatic
output: ledc_gpio
name: "Display Helligkeit"
id: display_backlight
restore_mode: ALWAYS_ON
entity_category: config
#Display
spi:
- clk_pin: 36
mosi_pin: 35
display:
- platform: st7701s
id: disp
#auto_clear_enabled: false
#update_interval: never
#spi_mode: MODE3
#color_order: BGR
color_order: RGB
dimensions:
width: 480
height: 480
#invert_colors: true
#transform:
# mirror_x: true
# mirror_y: true
cs_pin: 14
#reset_pin: 39
de_pin: 38
hsync_pin: 39
vsync_pin: 40
pclk_pin: 41
hsync_pulse_width: 1
hsync_front_porch: 20
hsync_back_porch: 1
vsync_pulse_width: 1
vsync_front_porch: 30
vsync_back_porch: 10
#pclk_frequency:
#pclk_inverted: False
#init_sequence:
# - 1 # select canned init sequence number 1
# - [ 0xE0, 0x1F ] # Set sunlight readable enhancement
setup_priority: -100
#init_sequence:
# - [0xFF, 0x77, 0x01, 0x00, 0x00, 0x13]
# - [0xEF, 0x08]
# - [0xFF, 0x77, 0x01, 0x00, 0x00, 0x10]
# - [0xC0, 0x3B, 0x00]
# - [0xC1, 0x0B, 0x02]
# - [0xC2, 0x07, 0x02]
# - [0xCC, 0x10]
# - [0xCD, 0x08]
# - [0xB0, 0x02, 0x13, 0x1B, 0x0D, 0x10, 0x05, 0x08, 0x07, 0x07, 0x24, 0x04, 0x11, 0x0E, 0x2C, 0x33, 0x1D]
# - [0xB1, 0x05, 0x13, 0x1B, 0x0D, 0x11, 0x05, 0x08, 0x07, 0x07, 0x24, 0x04, 0x11, 0x0E, 0x2C, 0x33, 0x1D]
# - [0xE0, 0x00, 0x00, 0x02]
# - [0x11]
# - delay 120ms
# - [0x3A, 0x55]
# - [0x36, 0x08]
# - [0x29]
# - delay 120ms
init_sequence:
- [0xFF, 0x77, 0x01, 0x00, 0x00, 0x13] # INIT 1
- [0xEF, 0x08] # INIT 2
- [0xFF, 0x77, 0x01, 0x00, 0x00, 0x10] # INIT 3
- [0xC0, 0x3B, 0x00] # INIT 4
- [0xC1, 0x0B, 0x02] # INIT 5
- [0xC2, 0x30, 0x02, 0x37] # INIT 6
- [0xCC, 0x10] # INIT 7
- [0xB0, 0x00, 0x0F, 0x16, 0x0E, 0x11, 0x07, 0x09, 0x09, 0x08, 0x23, 0x05, 0x11, 0x0F, 0x28, 0x2D, 0x18] # Gamma Control Positive
- [0xB1, 0x00, 0x0F, 0x16, 0x0E, 0x11, 0x07, 0x09, 0x08, 0x09, 0x23, 0x05, 0x11, 0x0F, 0x28, 0x2D, 0x18] # Gamma Control Negative
- [0xFF, 0x77, 0x01, 0x00, 0x00, 0x11] # INIT 8
- [0xB0, 0x4D] # INIT 9
- [0xB1, 0x33] # INIT 10
- [0xB2, 0x87] # INIT 11
- [0xB5, 0x4B] # INIT 12
- [0xB7, 0x8C] # INIT 13
- [0xB8, 0x20] # INIT 14
- [0xC1, 0x78] # INIT 15
- [0xC2, 0x78] # INIT 16
- [0xD0, 0x88] # INIT 17
- [0xE0, 0x00, 0x00, 0x02] # INIT 18
- [0xE1, 0x02, 0xF0, 0x00, 0x00, 0x03, 0xF0, 0x00, 0x00, 0x00, 0x44, 0x44] # INIT 19
- [0xE2, 0x10, 0x10, 0x40, 0x40, 0xF2, 0xF0, 0x00, 0x00, 0xF2, 0xF0, 0x00, 0x00] # INIT 20
- [0xE3, 0x00, 0x00, 0x11, 0x11] # INIT 21
- [0xE4, 0x44, 0x44] # INIT 22
- [0xE5, 0x07, 0xEF, 0xF0, 0xF0, 0x09, 0xF1, 0xF0, 0xF0, 0x03, 0xF3, 0xF0, 0xF0, 0x05, 0xED, 0xF0, 0xF0] # INIT 23
- [0xE6, 0x00, 0x00, 0x11, 0x11] # INIT 24
- [0xE7, 0x44, 0x44] # INIT 25
- [0xE8, 0x08, 0xF0, 0xF0, 0xF0, 0x0A, 0xF2, 0xF0, 0xF0, 0x04, 0xF4, 0xF0, 0xF0, 0x06, 0xEE, 0xF0, 0xF0] # INIT 26
- [0xEB, 0x00, 0x00, 0xE4, 0xE4, 0x44, 0x88, 0x40] # INIT 27
- [0xEC, 0x78, 0x00] # INIT 28
- [0xED, 0x20, 0xF9, 0x87, 0x76, 0x65, 0x54, 0x4F, 0xFF, 0xFF, 0xF4, 0x45, 0x56, 0x67, 0x78, 0x9F, 0x02] # INIT 29
- [0xEF, 0x10, 0x0D, 0x04, 0x08, 0x3F, 0x1F] # INIT 30
- [0x3A, 0x55] # Color Mode
- [0x36, 0x08] # Memory Data Access Control
- [0x11] # Sleep Out
- [0x29] # Display On
data_pins:
blue:
- 1 #b0
- 2 #b1
- 3 #b2
- 4 #b3
- 5 #b4
green:
- 6 #g0
- 7 #g1
- 8 #g2
- 9 #g3
- 10 #g4
- 11 #g5
red:
- 12 #r0
- 13 #r1
- 42 #r2
- 46 #r3
- 45 #r4
lambda: |-
it.print(10, 10, id(normal), "Display Test");
font:
- file: "fonts/MollenBold.otf"
id: normal
size: 24
bpp: 4
As you can see, I’ve already tried a lot back and forth. This is probably why the code now contains some useless or incorrect lines of code.
Hoping that at least the pin assignments are correct, I suspect the main reason for the non-functioning display is its initialization sequence. However, I cannot rule out the possibility that something else is wrong, as the Lilygo documentation cannot be relied upon.
Maybe someone has another tip for me to get the display working.
