MrMonotone
Posts: 28
Joined: Sat Nov 03, 2012 6:00 am

Performance of TFT Display 320 x 480 using emulators

Tue Apr 07, 2015 12:07 pm

On the Adafruit website they do not recommend using a 320 x 480 tft screen for emulation. Has anyone tested the performance of these screens using emulators? I am curious to know the difference.
Thanks
MM

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Trixster
Posts: 261
Joined: Sat Jul 07, 2012 3:53 pm

Re: Performance of TFT Display 320 x 480 using emulators

Tue Apr 07, 2015 7:47 pm

My pitft 320x480 should arrive tomorrow and that's precisely the first thing I'm going to try. I'll let you know!

MrMonotone
Posts: 28
Joined: Sat Nov 03, 2012 6:00 am

Re: Performance of TFT Display 320 x 480 using emulators

Wed Apr 08, 2015 9:21 am

Trixster wrote:My pitft 320x480 should arrive tomorrow and that's precisely the first thing I'm going to try. I'll let you know!
Looking forward to it. Also if you could give power draw numbers while playing the game that would be cool as well.

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Trixster
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Re: Performance of TFT Display 320 x 480 using emulators

Wed Apr 08, 2015 11:19 am

Haven't a clue how to do that I'm afraid.

artic1980
Posts: 15
Joined: Thu May 30, 2013 5:35 am

Re: Performance of TFT Display 320 x 480 using emulators

Fri Apr 10, 2015 5:17 am

I tested my pitft 3.5 adafruit with retropie and I must say I was quite happy not to levels of a monitor vga or hdmi but is playable when you have the chance to have a monitor.
I tested with a pack from bacteria 12000mA and was lit about 48 hours.

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Trixster
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Re: Performance of TFT Display 320 x 480 using emulators

Wed Apr 15, 2015 4:10 pm

I finally had chance to get this working. In my opinion it's fine on a 480x320 pitft, certainly on my 1ghz RPi 2. Snes and Amiga games appear to render with no issue.


wilsonb
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Re: Performance of TFT Display 320 x 480 using emulators

Tue Jun 16, 2015 11:24 pm

So, how about instructions for the 3.5? Im stuck on editing the /opt/retropie/supplementary/runcommand/runcommand.sh

toxibunny
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Re: Performance of TFT Display 320 x 480 using emulators

Wed Jun 17, 2015 5:27 pm

certainly looks playable.
note: I may or may not know what I'm talking about...

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Trixster
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Re: Performance of TFT Display 320 x 480 using emulators

Thu Jun 18, 2015 7:08 am

Have a read of this thread

http://blog.petrockblock.com/forums/top ... te-screen/

I followed the adafruit tutorial for getting a 28r screen but changed a few bits and bobs to get a 3.5" 35r screen working

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Trixster
Posts: 261
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Re: Performance of TFT Display 320 x 480 using emulators

Thu Jun 18, 2015 7:10 am

wilsonb wrote:So, how about instructions for the 3.5? Im stuck on editing the /opt/retropie/supplementary/runcommand/runcommand.sh
I don't recall changing runcommand.sh but it was a few months back so I can't quite remember.

luedi
Posts: 1
Joined: Fri Jul 17, 2015 1:32 pm

Re: Performance of TFT Display 320 x 480 using emulators

Fri Jul 17, 2015 2:03 pm

I also built a Retropie with a raspberry pi 2 and the 3.5" PiTFT.
But I have strange flickering on the screen as soon as the display loads through the hdmi to spi frame buffer driver.
It seems as if the refresh rate is below 20 Hz.

I have these parameters:

hdmi_cvt=480 320 60 1 0 0 0
hdmi_group=2
hdmi_mode=87

and:

dtoverlay=pitft35r,rotate=90,speed=62000000,fps=60


What are your settings in the boot.txt ?

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Trixster
Posts: 261
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Re: Performance of TFT Display 320 x 480 using emulators

Sat Jul 18, 2015 4:28 pm

Here's the end of my config.txt

# --- added by adafruit-pitft-helper Wed Apr 15 15:11:37 UTC 2015 ---
[pi1]
device_tree=bcm2708-rpi-b-plus.dtb
[pi2]
device_tree=bcm2709-rpi-2-b.dtb
[all]
dtparam=spi=on
dtparam=i2c1=on
dtparam=i2c_arm=on
#dtoverlay=pitft35r,rotate=90,speed=42000000,fps=20
# --- end adafruit-pitft-helper Wed Apr 15 15:11:37 UTC 2015 ---

hdmi_force_hotplug=1
hdmi_cvt=480 320 60 1 0 0 0
hdmi_group=2
hdmi_mode=87

dtoverlay=pitft35r,rotate=90,speed=80000000,fps=60
---------------------------------------

as you can see ive commented out the default dtoverlay line and added my own at the end. I think I've got a good display as a few others ive read about cant do 80000000 and 60

Do not overclock the core of your pi. any overclock above the default 250 seems to cause an error on mine. overclocks to ram and arm are fine.

mlepage
Posts: 95
Joined: Tue Jun 12, 2012 1:58 am

Re: Performance of TFT Display 320 x 480 using emulators

Sun Oct 15, 2017 4:02 pm

I have v1 of the PiTFT 3.5 resistive touch screen and have been playing with getting it working with RetroPie 4.3.

These days, the RetroPie image has the overlay so you just need to add the dtoverlay line to /boot/config.txt and get fbcp running (the Adafruit setup script does this fine).

I have found it will not do speed=80000000,fps=60, no way. In fact, it's not reliable at speed=60000000,fps=30. This is corroborated by a comment here: https://blog.petrockblock.com/forums/to ... -retropie/

It seems fine with speed=48000000 and even speed=56000000 but it seems laggy and there is tearing. If people are able to achieve higher speed and less tearing, they are either lucky in their specific screen (tolerating higher speed) or have different settings that they haven't explained well enough for us to replicate.

At any rate, it's a challenge to get the 3.5" display (480x320) working well, as it's pushing twice as many pixels as the 2.8" display (320x240). One thing I'm curious about, is why it's only using SPI, when it is also capable of using 8 or 16 bit parallel data, which seems like it would be faster. Is it a driver issue?

Domarius
Posts: 37
Joined: Sat Oct 14, 2017 1:44 am

Re: Performance of TFT Display 320 x 480 using emulators

Mon Oct 16, 2017 1:49 am

Woah, hey, hold on now, this changes everything for me! I'm about to start a similar project myself, so are you guys saying if I use a screen that has more than 320x240 resolution I'll get performance issues?

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RaTTuS
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Location: North West UK

Re: Performance of TFT Display 320 x 480 using emulators

Mon Oct 16, 2017 8:21 am

How To ask Questions :- http://www.catb.org/esr/faqs/smart-questions.html
WARNING - some parts of this post may be erroneous YMMV

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