Raspberry Pi Forums

dear guys,i need a 3.5 inch screen,I searched some on amazon and found a 60+ fps / 800*480 high resolution 3.5 inch screen.But it's a little expensive,please advise.

link: https://www.amazon.com/Uniker-Raspberry ... B01LX526QA

show video: https://s3.amazonaws.com/rpi2/rpi+scree ... ENSHOW.mp4

I have a very hard time believing the specs as presented. I've been working with 3.5" displays (Adafruit PiTFT and Neosec TinyLCD 35) and they have a resolution of 480x320. They're limited to about 20 fps due to the limitations of the SPI interface. To get higher resolutions and faster refresh rates, you need to go to an HDMI connection. The display you've linked to *appears* to be running off the GPIO connector, so the claims are...dubious, at least to me.

It isn't SPI based, it uses the GPIO DPI setup.

step 3. Config file to enable HD-TFT

Code: Select all

sudo nano /boot/config.txt

Add the following line:

Code: Select all

framebuffer_width=800
framebuffer_height=480
dtparam=spi=off
dtparam=i2c_arm=off
enable_dpi_lcd=1
display_default_lcd=1
dpi_output_format=0x6f015
dpi_group=2
dpi_mode=87
hdmi_timings=480 0 16 16 24 800 0 4 2 2 0 0 0 60 0 32000000 6
display_rotate=3

There won't be many i/o left for other things.

W. H. Heydt wrote:I have a very hard time believing the specs as presented. I've been working with 3.5" displays (Adafruit PiTFT and Neosec TinyLCD 35) and they have a resolution of 480x320. They're limited to about 20 fps due to the limitations of the SPI interface. To get higher resolutions and faster refresh rates, you need to go to an HDMI connection. The display you've linked to *appears* to be running off the GPIO connector, so the claims are...dubious, at least to me.

OK,thank u so much.I will try it.

BMS Doug wrote:It isn't SPI based, it uses the GPIO DPI setup.

step 3. Config file to enable HD-TFT

Code: Select all

sudo nano /boot/config.txt

Add the following line:

Code: Select all

framebuffer_width=800
framebuffer_height=480
dtparam=spi=off
dtparam=i2c_arm=off
enable_dpi_lcd=1
display_default_lcd=1
dpi_output_format=0x6f015
dpi_group=2
dpi_mode=87
hdmi_timings=480 0 16 16 24 800 0 4 2 2 0 0 0 60 0 32000000 6
display_rotate=3

There won't be many i/o left for other things.

OK,thank u for your reply.I will try it.