AndryBlack

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  1. Latest kernels include experimental fbttf modules. I connect cheapest oled screen(128x64px) via SPI to orange pi pc. Connections: data - spi0 mosi (PC0 pin 19) clk - spi0 clk (PC2 pin 23) cs - spi0 cs (PC3 pin 24) d/c - PC7 (pin 18) vcc - 3.3v (pin 1) gnd - gnd (pin 6) dts overlay: /* * adafruit13m-overlay.dts * * based on overlay for RPi https://github.com/kenrestivo/linux/blob/3d61a22b05cbf7ac2f6b620dcd45c2fb49fb9442/arch/arm/boot/dts/overlays/adafruit13m-overlay.dts */ /dts-v1/ /plugin/; / { compatible = "allwinner,sun8i-h3"; fragment@0 { target-path = "/aliases"; __overlay__ { spi0 = "/soc/spi@01c68000"; }; }; fragment@1 { target = <&pio>; __overlay__ { adafruit13m_pins: adafruit13m_pins { allwinner,pins = "PC7"; allwinner,function = "gpio_out"; }; }; }; fragment@2 { target = <&spi0>; __overlay__ { /* needed to avoid dtc warning */ #address-cells = <1>; #size-cells = <0>; status = "okay"; adafruit13m: adafruit13m@0{ compatible = "solomon,ssd1306"; reg = <0>; pinctrl-names = "default"; pinctrl-0 = <&adafruit13m_pins>; spi-max-frequency = <6000000>; buswidth = <8>; fps = <20>; dc-gpios = <&pio 2 7 0>; #debug = <3>; rotate = <0>; }; }; }; __overrides__ { #speed = <&adafruit13m>,"spi-max-frequency:0"; #rotate = <&adafruit13m>,"rotate:0"; fps = <&adafruit13m>,"fps:0"; #debug = <&adafruit13m>,"debug:0"; }; }; build: /usr/src/linux-headers-4.10.0-sun8i/scripts/dtc/dtc -@ -I dts -O dtb -o /boot/dtb-4.10.0-sun8i/overlay/adafruit13m-overlay.dtbo adafruit13m-overlay.dts added to /boot/armbianEnv.txt: overlays=adafruit13m-overlay #overlay loading extraargs=fbcon=map:1 #remove fbcon attachement after reboot new framebuffer device found (/dev/fb0 on my headless configuration)