notro
commented
7 years ago A 480x320 display at 16MHz will be slow. The tontec display which runs at 125MHz is probably the only 480x320 SPI display with good fbcp performance: https://github.com/notro/fbtft/wiki/Performance#mz61581-pi-ext fbcp triggers a full diplay update every time, as opposed to X windows which only triggers update of the changed region.
LiqwdE
Hello. First sorry for my bad english. I will try to explain my self as good I can I have installed a 3.5 Zoll Display from alliexpress on my Raspberry pi 1B with RetroPie. Becouse the connector was not aligned I have soldering 4cm wires from each tft pin to the pi. I have installed de LCD-show driver and configured it with sudo ./LCD35-show I have forced 640x480 resolution into HDMI (supossed scaled to 320x240 into tft display) editing /boot/config.txt with sudo nano config.txt and adding: hdmi_force_hotplug=1 hdmi_group=2 hdmi_mode=4 I have installed fbcp and added to the boot The result is the tft mirrored from the HDMI (THATS OK) but... the display is SO slow (laggy) I have tryed to change speed settings in /etc/modules but I think that I dont do somenthing well Can you help me please??
Mybe this can help...
pi@retropie:~ $ dmesg | grep spi [ 10.998928] spi-bcm2835 20204000.spi: chipselect 1 already in use [ 10.998968] spi_master spi0: spi_device register error /soc/spi@7e204000/waveshare35a-ts@1 [ 10.998998] spi_master spi0: Failed to create SPI device for /soc/spi@7e204000/waveshare35a-ts@1 [ 14.478463] ads7846 spi0.1: f(sample) 384 KHz? [ 14.478544] ads7846: probe of spi0.1 failed with error -22 [ 15.650350] graphics fb1: fb_ili9486 frame buffer, 480x320, 300 KiB video memory, 32 KiB DMA buffer memory, fps=33, spi0.0 at 16 MHz
pi@retropie:/boot $ lsmod Module Size Used by snd_hrtimer 2009 1 snd_seq 58506 1 snd_seq_device 5266 1 snd_seq cfg80211 499234 0 rfkill 21397 1 cfg80211 fb_ili9486 3213 2 fbtft 32615 1 fb_ili9486 syscopyarea 3161 1 fbtft sysfillrect 3716 1 fbtft ads7846 12525 0 sysimgblt 2422 1 fbtft fb_sys_fops 1677 1 fbtft hwmon 4552 1 ads7846 joydev 9194 0 evdev 11650 0 snd_bcm2835 23131 0 snd_pcm 95473 1 snd_bcm2835 snd_timer 22556 3 snd_hrtimer,snd_pcm,snd_seq snd 68368 6 snd_bcm2835,snd_timer,snd_pcm,snd_seq,snd_seq_device spi_bcm2835 7424 0 i2c_bcm2708 5740 0 bcm2835_gpiomem 3823 0 bcm2835_wdt 4133 0 uio_pdrv_genirq 3718 0 uio 10230 1 uio_pdrv_genirq uinput 7735 0 fuse 90216 1 ipv6 367607 28
pi@retropie:~ $ dmesg | grep graphics [ 15.650350] graphics fb1: fb_ili9486 frame buffer, 480x320, 300 KiB video memory, 32 KiB DMA buffer memory, fps=33, spi0.0 at 16 MHz
/etc/modules:
/etc/modules: kernel modules to load at boot time.
#
This file contains the names of kernel modules that should be loaded
at boot time, one per line. Lines beginning with "#" are ignored.
uinput fbtft_device speed=16000000
/boot/config.txt:
dtparam=i2c_arm=on dtparam=i2c1=on dtparam=spi=on enable_uart=1 hdmi_force_hotplug=1 hdmi_force_hotplug=1 hdmi_group=2 hdmi_mode=4 overscan_left=30
THANKS