Framebuffer on ST7735s (1.44inch LCD HAT)

readme.md

Enable modules in Kernel

In raspi-config

Enable SPI under "Interfacing options"

Add modules

$ sudo nano /etc/modules

Append two modules (in two lines) :

spi-bcm2835
fbtft_device

Create FBTFT configuration

# /etc/modprobe.d/fbtft.conf
options fbtft_device name=adafruit18_green gpios=reset:27,dc:25,cs:8,led:24 speed=40000000 bgr=1 fps=60 custom=1 height=128 width=128 rotate=180

Check /dev/fb1 is present

1. Reboot you Raspberry Pi

   $ sudo reboot
   

2. Once rebooted, check if new fb device is present

   $ sudo ls /dev # /dev/fb1 must appear
   $ sudo apt-get install fbset # framebuffer utility
   $ sudo fbset -i -fb /dev/fb1 # should return information of screen.
   

Change options in /boot/config.txt

Add or modify the following options in the file:

dtoverlay=pwm-2chan,pin=18,func=2,pin2=13,func2=4
hdmi_force_hotplug=1
hdmi_cvt=128 128 60 1 0 0 0
hdmi_group=2
hdmi_mode=1
hdmi_mode=87
display_rotate=1

#disable uart to boost boot speed
enable_uart=0
start_x=0

Then reboot:

$ sudo reboot

Synchroneous copy between fb0 and fb1

In order to display console and other things on the screen.

Compile fbcp

$ sudo apt-get install cmake
$ git clone https://github.com/tasanakorn/rpi-fbcp
$ cd rpi-fbcp/
$ mkdir build
$ cd build/
$ cmake ..
$ make
$ sudo install fbcp /usr/local/bin/fbcp

Test it

$ fbcp

Right now you should see the content of the screen on the pHAT screen.

Launch automatically at startup

Edit the file /etc/rc.local. Add before the exit 0 line:

fbcp&

References

• https://wavesharejfs.blogspot.com/2018/03/raspberry-pi-driv-144inch-lcd-hat-with.html
• https://www.sudomod.com/forum/viewtopic.php?f=11&t=5371&start=10
• https://pi0cket.com/guides/tiny-software-for-tinypi/#more-99

I did manage to get fb1 to show up, but my screen is still white.
I am sure, that its the S version.

Exactly the same issue ... Amazon says S .. but still white screen and no way to see fb1 also for me..

I am having the same problem with no luck. I'm doing everythign right i think.I'm following all the tutorials which more or less say the same thing. Still a white screen.

I got it working, but the screen goes blank after some time and won´t go back on.
Also couldn´t make it 128 x 128, it stays at 720 x 480

Edit: I got some info from my seller, he sent me this link:
https://www.waveshare.net/wiki/1.44inch_LCD_HAT?spm=a2g0s.imconversation.0.0.3d073e5fTM9i7J&file=1.44inch_LCD_HAT

you can translate it using chrome

I just noticed your cmake command is missing some arguments:

#1.3inch LCD HAT
cmake -DSPI_BUS_CLOCK_DIVISOR=20 -DWAVESHARE_ST7789VW_HAT=ON -DDMA_TX_CHANNEL=5 -DDMA_RX_CHANNEL=6 -DBACKLIGHT_CONTROL=ON -DSTATISTICS=0 ..
#1.44inch LCD HAT
cmake -DSPI_BUS_CLOCK_DIVISOR=20 -DWAVESHARE_ST7735S_HAT=ON -DDMA_TX_CHANNEL=5 -DDMA_RX_CHANNEL=6 -DBACKLIGHT_CONTROL=ON -DSTATISTICS=0 ..

mine had a channel error, which made me change 5 to 7 and 6 to 1

On my Zero 2w is this error: make
[ 50%] Building C object CMakeFiles/fbcp.dir/main.c.o
/home/jakob/rpi-fbcp/main.c:9:10: fatal error: bcm_host.h: No such file or directory
9 | #include <bcm_host.h>
| ^~~~~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/fbcp.dir/build.make:76: CMakeFiles/fbcp.dir/main.c.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/fbcp.dir/all] Error 2
make: *** [Makefile:91: all] Error 2