LCD (SPI) Panel Connection
Starting firmware version 1.4.0 Fanpico-0804D boards support SPI LCD displays via J18 connector.
Currently only 320x240 (or 240x320) resolution displays are supported. Larger screens should work but whole display is not used (support for larger resolutions shouldn't be difficult to add)
| LCD Controller (Chip) | Resolution | Notes |
|---|---|---|
| ILI9341 | 240x320 | Tested OK. ("SYS:DISP lcd=ILI9341") |
| ST7789 | 240x320 | Tested OK. ("SYS:DISP lcd=ST7789") |
| ILI9486 | 320x480 | (8bit SPI mode) Not tested. |
| ILI9486_RPI | 320x480 | (16bit SPI mode). Panels meant for Raspberry Pi GPIO header usually require 16bit SPI mode. Tested OK on a Waveshare (clone?) panel. ("SYS:DISP lcd=ILI9486_RPI") |
| HX8357 | 320480 | Not tested. |
By default I2C bus (for OLED display) TTL Serial (UART) are active. Since SPI shares pins with I2C and UART those connectors cannot be used when there is LCD Display connected to connector J18.
To configure LCD Display we must activate SPI mode (this explicitly disables I2C and UART) and configure the type of LCD panel that is connected.
For example to use generic ILI9341 based LCD module following:
SYS:SPI 1
SYS:DISP lcd=ILI9341
CONF:SAVE
*RST
Some display modules may require additional settings to work properly (to fix colors, orientation, etc).
For example, it is possible to rotate screen:
SYS:DISP lcd=ILI9341,rotate=270
Or swap red and green colors if colors don't display correctly:
SYS:DISP lcd=ILI9341,swapcolors
See SYS:DISP for more details.
NOTE! When using SPI connector, OLED display connector(s) and Serial TLL connector cannot be used at the same time, since I2C/UART share same pins as the SPI on connector J18.
| J18 Pin | LCD Panel Pin | Description |
|---|---|---|
| 1 | DC | Data/Command selector pin |
| 2 | Vcc / Vin | 3.3V DC power for the LCD display |
| 3 | SCK | SPI Clock Input pin |
| 4 | MOSI | SPI Microcontroller Out Serial In pin |
| 5 | CS | SPI Chip Select |
| 6 | GND | Ground |
| 7 | LED / BL | Display Backlight |
| 8 | RST | Display Reset |
NOTE current PCBs only have 6-pin connector (future ones are planned to include 8-pin connector). When using SPI LCD panel on current boards it may be necessary connect Vcc (pin 2) to RST and LED pins on the LCD display (unless display has built-in pull up resistors on those pins).
