(WORK IN PROGRESS)

The connection

Software

/dts-v1/;
/plugin/;

/ {
	compatible = "allwinner,sun8i-h3";

	fragment@0 {
		target = <&spi0>;
		__overlay__ {
			status = "okay";

			spidev@0{
				status = "disabled";
			};

			spidev@1{
				status = "disabled";
			};
		};
	};

	fragment@1 {
		target = <&pio>;
		__overlay__ {
			// Set up pins
			ili9486_pins: ili9486_pins {
				allwinner,pins = "PA2", "PC7"; // Add DC/RS nad RST pins here
				allwinner,function = "gpio_in";
			};
		};
	};

	fragment@2 {
		target = <&spi0>;
		__overlay__ {
			/* needed to avoid dtc warning */
			#address-cells = <1>;
			#size-cells = <0>;

			ili9486: ili9486@0{
				compatible = "ilitek,ili9486";
				reg = <0>;
				pinctrl-names = "default";
				pinctrl-0 = <&ili9486_pins>;

				spi-max-frequency = <16000000>;
				txbuflen = <32768>;
				rotate = <90>;
				bgr = <0>;
				fps = <30>;
				buswidth = <8>;
				regwidth = <16>;
				// Select pins: 1st number = pos. of letter in the alphabet - 1
				//              2nd number = pin number
				//              3rd number = DON'T CHANGE! (1 = ACTIVE_LOW, 0 = ACTIVE_HIGH)
				// Example: PA2 = <&pio 0 2 1>
				//          PC7 = <&pio 2 7 0>
				reset-gpios = <&pio 0 2 1>; // RST pin
				dc-gpios = <&pio 2 7 0>; // DC/RS pin
				debug = <0>;

				init = <0x10000b0 0x00
						0x1000011
					0x20000ff
					0x100003a 0x55
					0x1000036 0x28
					0x10000c2 0x44
					0x10000c5 0x00 0x00 0x00 0x00
					0x10000e0 0x0f 0x1f 0x1c 0x0c 0x0f 0x08 0x48 0x98 0x37 0x0a 0x13 0x04 0x11 0x0d 0x00
					0x10000e1 0x0f 0x32 0x2e 0x0b 0x0d 0x05 0x47 0x75 0x37 0x06 0x10 0x03 0x24 0x20 0x00
					0x10000e2 0x0f 0x32 0x2e 0x0b 0x0d 0x05 0x47 0x75 0x37 0x06 0x10 0x03 0x24 0x20 0x00
					0x1000036 0x28
					0x1000011
					0x1000029>;
			};

		};
	};

};

References

Display module pinout – “Official” product wiki – http://www.lcdwiki.com/MHS-3.5inch_RPi_Display#Hardware_Description
DTS template – Armbian forums – https://forum.armbian.com/topic/11701-35-lcd-ili9486-with-orange-pi-zero/
Misc. information about a similar module – Armbian forums – https://forum.armbian.com/topic/4656-orangepi-zero-mainline-kernel-spi-lcd-touchscreen/

We think of SSH as just a simple Secure SHell, but did you know it can also forward ports? Yes, of course you did! We’ve all probably read this exact sentence in probably hundreds if not thousands of articles out there. What you probably haven’t read, is an article that summarizes all of the different options in a nice, concise and copy-pastable way.

“Forward” port … forwarding

(TODO)

Reverse port forwarding

You’re in a closed network – NAT, firewall, trigger-happy intrusion detection, etc. You have a service running at a local address on a local port. You have a remote server with SSH. You want to access remote server on remote port and have your traffic be tunneled to your internal service.

user@[local machine]:~/ $ ssh [remote server] -R [remote port]:[local address]:[local port] 

Example:

I’m at work on my workstation. I’m running a crappy NodeJS app on localhost port 80. I want to show it off to a recruiter because I hate this job, but the sysadmin knows I want to leave so he won’t let me forward a port. I have a cheap VPS at cheap-vps.no-ip.org and want expose my app on port 8080.

user@workstation:~/ $ ssh shitty-vps.no-ip.org -R 8080:localhost:80

My shitty web app will now be accessible at http://shitty-vps.no-ip.org:8080/ and I will soon be safe from the stale coffee and bad hours of my current employer.

See, I really enjoy making things. I love figuring out how to turn a crazy idea I had on a bus into a working thing that I can impress my only 2 friends with enjoy and use. But I have a problem: I never seem to finish anything!

Some of the projects that I stared working on but are now just boxes of parts collecting dust in my closet include: a motorized pan&tilt camera head for gigapanos, a fully modular 3D printer / laser cutter / CNC engraver, a (motorized) camera slider, a HAM radio answering machine, a universal high-speed camera trigger, a log-distance data connection over laser beams…
There’s also the Renault 5 that was supposed to be all computerized and open-source, but that isn’t in my closet. It’s in a junkyard. Because I was too slow.

But I think I might’ve found my problem:

*hours and hours of measurement and calculation*

“Ok, let’s do this!”

*a single resistor blows*

“Well, I guess I’m just incompetent”

me, during every single project ever

So, how do I fix this? My theory is that if I force myself to write about it, I will think about it more and thus screw up less. And writing “articles” makes me feel all “professional” or whatever, which also helps…