ILI9341 low fps

[N3KRoN]

Hello, I am using the ILI9341 screen with the scheme connection (non SPI) from here on my raspberry pi type B, but I have 2 problems: 1) I can't rotate the picture 270 degrees to make it vertical 2) the screen refresh rate is too slow

https://github.com/nopnop2002/Raspberry-ili9325/

https://user-images.githubusercontent.com/11051346/166451879-2f652710-0474-41c0-8b90-2beb5abaf820.mp4

/etc/modprobe.d/fbtft.conf

options fbtft_device name=flexpfb bgr=1 fps=30 gpios=reset:4,dc:3,wr:7,cs:2,db00:15,db01:17,db02:18,db03:27,db04:22,db05:23,db06:24,db07:25 options flexfb width=480 height=320 buswidth=8 init=-1,0x01,-2,5,-1,0x28,-1,0x36,0x58,-1,0x3A,0x55,-1,0x11,-2,100,-1,0x29,-2,20,-3

(rotate=270 does not work)

dmesg:

[ 3.546733] fbtft: module is from the staging directory, the quality is unknown, you have been warned. [ 3.562533] flexfb: module is from the staging directory, the quality is unknown, you have been warned. [ 3.572814] fbtft_device: module is from the staging directory, the quality is unknown, you have been warned. [ 3.574904] bcm2708_fb soc:fb: soc:fb id=-1 pdata? no [ 7.703503] graphics fb1: flexfb frame buffer, 480x320, 300 KiB video memory, 4 KiB buffer memory, fps=33 [ 7.703661] fbtft_device: GPIOS used by 'flexpfb': [ 7.703676] fbtft_device: 'reset' = GPIO4 [ 7.703683] fbtft_device: 'dc' = GPIO3 [ 7.703689] fbtft_device: 'wr' = GPIO7 [ 7.703694] fbtft_device: 'cs' = GPIO2 [ 7.703700] fbtft_device: 'db00' = GPIO15 [ 7.703705] fbtft_device: 'db01' = GPIO17 [ 7.703711] fbtft_device: 'db02' = GPIO18 [ 7.703717] fbtft_device: 'db03' = GPIO27 [ 7.703723] fbtft_device: 'db04' = GPIO22 [ 7.703728] fbtft_device: 'db05' = GPIO23 [ 7.703734] fbtft_device: 'db06' = GPIO24 [ 7.703740] fbtft_device: 'db07' = GPIO25 [ 7.703809] bcm2708_fb soc:fb: soc:fb id=-1 pdata? no [ 7.703842] flexfb flexpfb.0: flexpfb id=0 pdata? yes

[notro]

fbtft is bitbanging the parallel bus making it slow: fbtft_write_gpio8_wr(). Using SPI is faster when it can use DMA, but even SPI will be "slow" on a 480x320 display. Some old performance tests: https://github.com/notro/fbtft/wiki/Performance

If you can use SPI and have the Raspberry Pi v5.15 kernel, the panel-mipi-dbi driver is a better choice since it can run at higher speeds without messing up the controller configuration. Ref: fbtft-vs-drm

[N3KRoN]

Unfortunately, I can't use spi in any way, this screen is an arduino shield with parallel connection... I managed to flip the screen and solve the issue with an update, now the screen shows as it should, but fbtft creates a very heavy load on the rpi type b and works very slowly everything

[rsaxvc]

Can you use the SMI interface with DMA to drive the parallel bus?

[notro]

SMI is discussed in this thread: https://forums.raspberrypi.com/viewtopic.php?t=334068

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