[Guide] ili9341 SPI TFT Screen on Retropie

[facelessloser]

Oh so you couldn't get it to work on the breakout board but could on the bare screen?

yes

Thanks, Im going to have to make a breakout board now

[cbafun]

Hi,

Sorry for picking up on an old topic here. I have followed your tutorial here and everything works great. My only question is:

Is there a way to utilise GPIO 12 (Pin32) for the backlight instead of GPIO18. I am trying to squeeze in an I2S amp on my board, and that is inconveniently also utilising GPIO 18. As far as I can understand, the screen is using the PWM function of GPIO 18 (PWM0) and GPIO 12 seems to have that same function. If this is a possibility, where can I make the change in the code, I have looked, but can't seem to find it anywhere. Again, thanks for a lovely writeup!

[VeteranGamer]

Hi,

Sorry for picking up on an old topic here. I have followed your tutorial here and everything works great. My only question is:

Is there a way to utilise GPIO 12 (Pin32) for the backlight instead of GPIO18. I am trying to squeeze in an I2S amp on my board, and that is inconveniently also utilising GPIO 18. As far as I can understand, the screen is using the PWM function of GPIO 18 (PWM0) and GPIO 12 seems to have that same function. If this is a possibility, where can I make the change in the code, I have looked, but can't seem to find it anywhere. Again, thanks for a lovely writeup!

you don't need to use GPIO18 for the LED....
if you connect the LED up to the VCC (ideally using something like 10ohm resistor)


this has been done, and is tried and tested
and will allow you to use GPIO18




.

[Helder]

You can also use the other PWN pin if you really want to use it or hardwire it in like VeteranGamer said above.

[chendavid]

Oh so you couldn't get it to work on the breakout board but could on the bare screen?

yes

Sorry to bother. I just saw what your amazing achievement. However, I can not duplicate what you did with the fbcp-ili9341 cmake. I have the same st7789vw bare board and wire to raspberry zero. Fbtft can activate it, but with very low framerate. Is there any wire diagram and what you did beside cmake code? Cause I just got eternity main looping, or DMA channel conflict. Appreciate your help~

[facelessloser]

Oh so you couldn't get it to work on the breakout board but could on the bare screen?

yes

Sorry to bother. I just saw what your amazing achievement. However, I can not duplicate what you did with the fbcp-ili9341 cmake. I have the same st7789vw bare board and wire to raspberry zero. Fbtft can activate it, but with very low framerate. Is there any wire diagram and what you did beside cmake code? Cause I just got eternity main looping, or DMA channel conflict. Appreciate your help~

Hi I'll see if I can be any help. So I wired the screen up the same way waveshare did with their hat board here https://www.waveshare.com/1.3inch-lcd-hat.htm
I also followed a guild they send me here
https://www.waveshare.com/wiki/File:1.3 ... ual_en.pdf

I have also written up my own guide to getting it up and running
https://facelesstech.wordpress.com/2019 ... pberry-pi/
Hope this will help you out

[chendavid]

yes

Sorry to bother. I just saw what your amazing achievement. However, I can not duplicate what you did with the fbcp-ili9341 cmake. I have the same st7789vw bare board and wire to raspberry zero. Fbtft can activate it, but with very low framerate. Is there any wire diagram and what you did beside cmake code? Cause I just got eternity main looping, or DMA channel conflict. Appreciate your help~

Hi I'll see if I can be any help. So I wired the screen up the same way waveshare did with their hat board here https://www.waveshare.com/1.3inch-lcd-hat.htm
I also followed a guild they send me here
https://www.waveshare.com/wiki/File:1.3 ... ual_en.pdf

I have also written up my own guide to getting it up and running
https://facelesstech.wordpress.com/2019 ... pberry-pi/
Hope this will help you out

it works perfectly!! Thanks for sharing your guide with me. You really make my day!

[ElectrodeYT]

Sorry if this has been said before, but fbcp-ili9341 is so much better. It can refresh a screen very quickly, and if too much is going on it will interlace the display.

[sandog]

what screens seem to work the best so far from everyone's testing?

[sandog]

Will this screen work?


https://www.aliexpress.com/item/New-3-5 ... 4c4dLpzxL2