Yet Another Pi Zero Portable!!

gazredtyke

@moosepr would it be adafruit28 as my tft is 2.8"?

moosepr

@gazredtyke I think it will be the 22. i cant see a 2.8 device listed on the driver wiki, in theory the 2.2, 2.4, and 2.8 inch screens are all identically internally, they just have different sized pixels

https://github.com/notro/fbtft/wiki/LCD-Modules

gazredtyke

@moosepr The error message is "could not insert 'fbtft_device' : Invalid argument'

moosepr

@gazredtyke I will have to get mine hooked up to a keyboard and see what I typed to get it going, it's been a while...

moosepr

@gazredtyke try

sudo modprobe fbtft_device name=fb_ili9340

gazredtyke

@moosepr still getting the same error mate, as I say though I couldn't find how to enable device tree

moosepr

@gazredtyke I have just looked on mine and i dont think i could find the device tree bit, i sure cant now!! have you enabled the SPI?

gazredtyke

@moosepr can you show a diagram of which gpio pin layout you followed? Maybe that's the issue?

moosepr

@gazredtyke the error seems to suggest that it doest like the options being passed into the fbtft device call. my command scroll back doesnt go far enough back to see my initial testing bits. I need to go back to a fresh install of retropie and follow it all from the beginning.

If my new 2.2" screens ever come from china, i will be setting up another pi and will detail the lot

gazredtyke

@moosepr could you show the gpio layout? I seem to have 2 different ones 😮

moosepr

@gazredtyke im pretty sure that i used

Display - Raspberry Pi
BL - pin 12
SCK - pin 23
MISO - pin 21
MOSI - pin 19
CS - pin 24
RST - pin 22
D/C - pin 18
VIN - pin 17
GND - pin 20

pinz

gazredtyke

@moosepr I've got the same with the exception I don't have anything on miso as that one is for the sd card isn't it?

moosepr

@gazredtyke that is what it said in the original link I sent you, but I'm pretty sure I linked the pin on my screen. I squashed the wires so it's hard to follow which is which, but I do seem to remember filling most of that block of pins on the pi

gazredtyke

@moosepr so maybe if I wire the miso to the pi?

moosepr

@gazredtyke give it a go. I'm pretty sure the only pins that are shared between the screen and the SD card are the power ones (but I could be wrong)

gazredtyke

@moosepr no joy 😭

moosepr

@gazredtyke this works for me

sudo modprobe fbtft_device custom name=fb_ili9341 gpios=reset:25,dc:24,led:18 speed=16000000 bgr=1

gazredtyke

@moosepr thanks, I'm out tonight but I'll try that after work tomorrow, failing that I've found an instructable using the same screen

AluLagoa

First of all, sorry for the necro...

Great work!
This inspired me to make my own portable.

So, you run your setup straight from the 3.7v 2000mah lipo. How much play time does it give you?

moosepr

@AluLagoa necro!! ha ha!!

I did a runtime test, launched an N64 game and let the intro video run, so the pi should have been working pretty hard.

I got 10 hours on the test, but im not 100% sure what capacity the batteries are. My usb power meter claims it was 2500mah that the battery took to get to full, although this is sometimes misleading, as the voltages are different.

if we multiply the 5v charge by the 2500mah current (2.5amps) we get 12.5 watts. now the battery will actually be taking 4.2 volts to charge, so divide our wattage by our voltage actually gives us 2.98 amps, so its possible it is actually a 3000mah battery!