Difference between revisions of "Matrix - 2'8 SPI Key TFT"

Latest revision as of 07:17, 21 February 2022

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1 Introduction

• The Matrix-2.8_SPI_Key_TFT LCD is a FriendlyARM developed LCD module with resistive touch panel. Its resolution is 240 x 320. It uses the ST7789V IC and XPT2046 resistive touch IC. It has SPI interface and three configurable user keys.

• Specification

By default the module's backlight is turned on after the module is powered on. LED_EN can be set to turn off the backlight. If you don’t want the backlight to be turned on after the module is powered on you can take off R12 and in this case you can turn on the backlight by pulling up LED_EN.

2 Features

• PCB dimension(mm):

• Pin Description:

FriendlyElec has released two versions. Here are the spec:

The Matrix-2'8_SPI_Key_TFT-1706 exposes T_CS from Pin26 to Pin12. And NEO/NEO2/NEO-Plus2 all of which have a 24Pin connector will be able to work with its touch.

3 Applicable Boards & OS

4 Applications

4.1 H3 Based Boards

Connect to NanoPi M1:
Refer to the following hardware setup to connect the module to the NanoPi M1:

Connect to NanoPi M1 Plus:
Refer to the following hardware setup to connect the module to the NanoPi M1 Plus:

Connect to NanoPi NEO:
Refer to the following hardware setup to connect the module to the NanoPi NEO:

Connect to NanoPi NEO Air:
Refer to the following hardware setup to connect the module to the NanoPi NEO Air:

Connect to NanoPi NEO Core:
Refer to the following hardware setup to connect the module to the NanoPi NEO Core:

4.2 H5 Based Boards

Connect to NanoPi NEO2:

Connect to NanoPi NEOPlus2:
Matrix-2'8_SPI_Key_TFT_nanopi_neo_plus2

Connect to NanoPi NEO Core2:
Refer to the following hardware setup to connect the module to the NanoPi NEO Core:

4.3 S5P4418 Based Boards

Connect to NanoPi 2:
Refer to the following hardware setup to connect the module to the NanoPi 2:

Connect to NanoPi M2 / NanoPi 2 Fire:
Refer to the following hardware setup to connect the module to the NanoPi M2 / NanoPi 2 Fire:
Matrix-2'8_SPI_Key_TFT_nanopi_m2

5 Run pre-enabled Matrix-2'8_SPI_Key_TFT ROM

Board Type	CPU Model	Download Link to Image File	Image File
NanoPi NEO	H3	Download	official-ROMs/accessory-ROMs/nanopi-neo_sd_ubuntu-tft_4.14_YYYYMMDD.img.zip
NanoPi NEO Air	H3	Download	official-ROMs/accessory-ROMs/nanopi-neo-air_sd_ubuntu-tft_4.14_YYYYMMDD.img.zip
NanoPi M1	H3	Download	official-ROMs/accessory-ROMs/nanopi-m1_sd_ubuntu-tft_4.14_YYYYMMDD.img.zip
NanoPi M1 Plus	H3	Download	official-ROMs/accessory-ROMs/nanopi-m1-plus_sd_ubuntu-tft_4.14_YYYYMMDD.img.zip
NanoPi NEO Core	H3	Download	official-ROMs/accessory-ROMs/nanopi-neo-core_sd_ubuntu-tft_4.14_YYYYMMDD.img.zip
NanoPi NEO2	H5	Download	official-ROMs/accessory-ROMs/nanopi-neo2_sd_ubuntu-tft_4.14_YYYYMMDD.img.zip
NanoPi NEO Plus2	H5	Download	official-ROMs/accessory-ROMs/nanopi-neo-plus2_sd_ubuntu-tft_4.14_YYYYMMDD.img.zip
NanoPi NEO Core2	H5	Download	official-ROMs/accessory-ROMs/nanopi-neo-core2_sd_ubuntu-tft_4.14_YYYYMMDD.img.zip
NanoPi K1 Plus	H5	Download	official-ROMs/accessory-ROMs/nanopi-k1-plus_sd_ubuntu-tft_4.14_YYYYMMDD.img.zip

6 Compile & Run Test Program Manually

6.1 H3/H5

Note: the following method only applies for the Matrix-2'8_SPI_Key_TFT-1706 model. To test a Matrix-2'8_SPI_Key_TFT-1512(silkscreen T28-02 1512) refer to the last section and set Pin26 as the touch's enable/disable pin.

6.1.1 Linux-4.14

6.1.1.1 Use npi-config to enable 2.8"TFT

If you use a FriendlyElec's H3/H5 board under Mainline Linux-4.14 kernel you need to enable the 2.8"TFT with npi-config.Start npi-config as root:

$ npi-config

Open the following menu:

Open SPI:

Enable/Disable SPI0:

Enable SPI0 and then select Matrix-2.8"_SPI_Key_TFT:

Return to the main menu and do <Finish>. Reboot your system and run the following command to check whether or not the Matrix-2.8"_SPI_Key_TFT is enabled:

$ ls /dev/fb-st7789s 
/dev/fb-st7789s

/dev/fb-st7789s stands for a framebuffer device

$ ls /dev/input/ts-ads7846 
/dev/input/ts-ads7846

/dev/input/ts-ads7846 stands for a touch device When you first start the system you will be prompted to click on five points to do calibration.

Note: in the mainline Linux-4.x kernel Pin12 of Matrix-2'8_SPI_Key_TFT-1706 is by default set as touch device's enable/disable pin.
After you enable the Matrix-2'8_SPI_Key_TFT with npi-config your system will set it as your default display device. If you want to make Qt-demo auto-start on system boot you can follow the steps below:

Enter Autologin:

Enter Qt/Embedded:

Enable Qt/E Demo:

Return to the main menu and do <Finish>.Reboot your system and your Qt/E demo will be started automatically:

6.1.1.2 Control backlight

$ echo 1 >/sys/class/backlight/fb_st7789v/bl_power   # 关闭背光
$ echo 0 >/sys/class/backlight/fb_st7789v/bl_power   # 打开背光

6.1.1.3 Extra setup for Matrix-2'8_SPI_Key_TFT-1512

If you connect a Matrix-2'8_SPI_Key_TFT-1512(silkscreen T28-02 1512) to a NanoPi M1/NanoPi M1 Plus you need to make changes in the kernel code to set Pin26 as touch's enable/disable pin.
Compile your kernel by following the steps in Mainline U-boot & Linux and make the following changes:

$ vi linux/arch/arm/boot/dts/sun8i-h3-nanopi
    ...
    spi0_cs_pins: spi0_cs_pins {
        pins = "PC3", "PA6";
        function = "gpio_out";
    };
    ...
&spi0 {
    ...
    cs-gpios = <&pio 2 3 GPIO_ACTIVE_HIGH>, <&pio 0 6 GPIO_ACTIVE_HIGH>;
    ...

<&pio 0 6 GPIO_ACTIVE_HIGH> means setting GPIOA6(Pin12) as touch's enable/disable pin. Change it to GPIOA17(Pin26):

    ...
    spi0_cs_pins: spi0_cs_pins {
        pins = "PC3", "PA17";
        function = "gpio_out";
    };
    ...
&spi0 {
    ...
    cs-gpios = <&pio 2 3 GPIO_ACTIVE_HIGH>, <&pio 0 17 GPIO_ACTIVE_HIGH>;
    ...

Recompile the kernel code and copy the "sun8i-h3-nanopi-m1.dtb/sun8i-h3-nanopi-m1-plus.dtb" file under arch/arm/boot/dts/ to your TF card's boot section and reboot your board.

6.2 S5P4418/S5P6818

The following steps only apply to Kernel Linux-4.4. We took the NanoPi Fire3 as an example. Run the following commands to initialize FriendlyElec's 2.8" SPI LCD. These commands need to be run only once.

sudo mount /dev/mmcblk0p1 /boot
sudo apt-get update
sudo apt-get install device-tree-compiler
sudo fdtput /boot/s5p6818-nanopi3-rev05.dtb spi0/spidev@0 status -t s "disabled"
sudo fdtget /boot/s5p6818-nanopi3-rev05.dtb spi0/spidev@0 status
sudo fdtput /boot/s5p6818-nanopi3-rev05.dtb spi0/fbtft@0 status -t s "okay"
sudo fdtget /boot/s5p6818-nanopi3-rev05.dtb spi0/fbtft@0 status
sudo reboot

Note: the "s5p6818-nanopi3-rev05.dtb" file is the kernel dtb file for the NanoPi Fire3. For another board you need to check its system's "/sys/devices/platform/board/info" file to figure out its dtb file.:

cat /sys/devices/platform/board/info

Here is the info file's content for the NanoPi Fire3:
Hardware  : NANOPI3
Revision  : 0005
Serial  : fa6818dba7110739
The "Hardware" here is "NANOPI3", "Revision" is "0005", "CPU" is "S5P6818", therefore the NanoPi Fire3's kernel dtb file name is "s5p6818-nanopi3-rev05.dtb".

After the dtb file is confirmed you can reboot your board and run the following command to check if the fb_st7789v module is loaded:

lsmod

Here is what you expect to see:
Module Size Used by
fb_st7789v 3315 0
fbtft 31881 1 fb_st7789v

Or you can run dmesg to check that. In our case after we ran dmesg we found that the SPI LCD was recognized as an "fb1" device:

dmesg | grep fb_st7789v

Here is what you expect to see:
[ 6.728000] fb_st7789v: module is from the staging directory, the quality is unknown, you have been warned.
[ 6.908000] graphics fb1: fb_st7789v frame buffer, 320x240, 150 KiB video memory, 4 KiB buffer memory, fps=35, spi0.0 at 50 MHz
Now as long as you set your system's framebuffer device to fb1 in either Qt or X-Windows you will see output in your LCD.

6.2.1 Launch Lubuntu Desktop on 2.8"LCD

On lubuntu desktop run the following commands:
Firstly remove the armsoc configuration file:

sudo rm -f /usr/share/X11/xorg.conf.d/20-armsoc.conf

Secondly create a new configuration file /etc/X11/xorg.conf:

sudo vi /etc/X11/xorg.conf

Here is its content:

Section "Monitor"
    Identifier          "Primary"
    VendorName          "FriendlyARM"
EndSection
 
Section "Device"
    Identifier          "Primary"
    Driver              "fbdev"
    Option              "fbdev" "/dev/fb1"
EndSection

After reboot you will see the following GUI:

A touch panel is currently not supported yet. You need to use a mouse and keyboard to operate.

6.2.2 Run Qt Application on 2.8"LCD

Open a terminal in friendly-core and run the following commands to start a Qt demo:

. setqt5env
export QT_QPA_PLATFORM=linuxfb:fb=/dev/fb1
export QT_QPA_EGLFS_TSLIB=1
export QT_QPA_GENERIC_PLUGINS=tslib,evdevkeyboard
$QTDIR/examples/widgets/widgets/tetrix/tetrix

Here is a Qt demo:

A touch panel is currently not supported yet. You need to use a mouse and keyboard to operate.

7 Update Log

7.1 Dec-15-2017

• Released English version

8 Resources

9 Update Log

9.1 Feb-24-2016

• Added the driver's source code location in Section 5.2

9.2 June-17-2016

• Re-organized and simplified wiki

9.3 March-5-2017

• Added sections 3.2, 3.3, 3.4 and 4.1

9.4 July-5-2017

• Updated sections 4 and 5

9.5 July-15-2017

• Updated section 5