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feat(docs): add GPIO 3.5 Type B

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Alfredo Monclus 2024-07-21 12:47:53 -03:00
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docs/Hardware/GPIO_35.md
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@ -98,3 +98,106 @@ fbcon=map:11
!!! warning "Important"
Do not add newlines to the file, it must be 1 line with the options separated by spaces
## Type (B-v2)
I have tried the type (B) version 2, and it's quite different, this screen has a different initialization sequence,
probably due to being IPS
so you will need the waveshare35b-v2 dtb of the [waveshare repo](https://github.com/waveshare/LCD-show), to be copied into the apropriate folder
```
git clone https://github.com/waveshare/LCD-show
sudo cp LCD-show/waveshare35b-v2-overlay.dtb /boot/firmware/overlays/waveshare35b-v2.dtbo
```
the config would be something like this, another major difference is that this display will default to vertical
the maximum speed i could achieve with mine was 33mhz (400mhz/12) without color aberration,
but i ended up with 30mhz to have some margin
this overlay supports an fps value, default is 30 i changed it to 60
this screen was never super responsive but with this configuration is quite tolerable in my opinion.
``` title="/boot/firmware/config.txt"
dtoverlay=waveshare35b-v2:rotate=270,drm,speed=30000000,fps=60
```
```ini title="example of dmesg output"
...
[ 14.926080] input: ADS7846 Touchscreen as /devices/platform/soc/3f204000.spi/spi_master/spi0/spi0.1/input/input0
[ 15.015895] fbtft: module is from the staging directory, the quality is unknown, you have been warned.
[ 15.021701] fb_ili9486: module is from the staging directory, the quality is unknown, you have been warned.
[ 15.022279] SPI driver fb_ili9486 has no spi_device_id for ilitek,ili9486
[ 15.022555] fb_ili9486 spi0.0: fbtft_property_value: regwidth = 16
[ 15.022572] fb_ili9486 spi0.0: fbtft_property_value: buswidth = 8
[ 15.022588] fb_ili9486 spi0.0: fbtft_property_value: debug = 0
[ 15.022600] fb_ili9486 spi0.0: fbtft_property_value: rotate = 270
[ 15.022615] fb_ili9486 spi0.0: fbtft_property_value: fps = 60
[ 15.022627] fb_ili9486 spi0.0: fbtft_property_value: txbuflen = 32768
[ 15.826386] graphics fb1: fb_ili9486 frame buffer, 480x320, 300 KiB video memory, 32 KiB buffer memory, fps=62, spi0.0 at 30 MHz
...
```
by default with this configuration the output will be on the secondary framebuffer
so a file must be created to address this issue:
``` title="/usr/share/X11/xorg.conf.d/99-fbdev.conf"
Section "Device"
Identifier "Allwinner A10/A13 FBDEV"
Option "fbdev" "/dev/fb1"
Option "SwapbuffersWait" "true"
EndSection
```
!!! tip
notice that i'm using fbdev and not fbturbo, you can use fbturbo if you like (remeber to install it)
at this point this still did not work:
```ini title="example of /var/log/Xorg.0.log"
[ 172.061] (II) LoadModule: "modesetting"
[ 172.061] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[ 172.064] (II) Module modesetting: vendor="X.Org Foundation"
[ 172.064] compiled for 1.21.1.7, module version = 1.21.1
[ 172.064] Module class: X.Org Video Driver
[ 172.064] ABI class: X.Org Video Driver, version 25.2
[ 172.065] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[ 172.067] (WW) Falling back to old probe method for modesetting
[ 172.068] (EE) open /dev/dri/card0: No such file or directory
[ 172.068] (WW) Falling back to old probe method for modesetting
[ 172.068] (EE) open /dev/dri/card0: No such file or directory
[ 172.068] (EE) No devices detected.
[ 172.068] (EE)
Fatal server error:
[ 172.068] (EE) no screens found(EE)
```
so i checked out the configuration and found:
``` title="default contents of /usr/share/X11/xorg.conf.d/20-noglamor.conf"
Section "Device"
Identifier "kms"
Driver "modesetting"
Option "AccelMethod" "msdri3"
Option "UseGammaLUT" "off"
EndSection
```
did:
```
sudo nano /usr/share/X11/xorg.conf.d/20-noglamor.conf
```
deleted everything and saved.
then removed the write permissions to prevent being regenerated:
```
sudo chmod 444 /usr/share/X11/xorg.conf.d/20-noglamor.conf
```
at this point the screen was working, but the touchscreen needed to be rotated:
``` title="rules for rotation: /etc/udev/rules.d/51-touchscreen.rules"
ACTION=="add", ATTRS{name}=="ADS7846 Touchscreen", ENV{LIBINPUT_CALIBRATION_MATRIX}="0 1 0 -1 0 1 0 0 1"
```
after a reboot the waveshare type b rev2 was working perfectly at this point.