Jetson Nano で Framebuffer Driver を使用する

19938 ワード

SPI fbtft framebuffer JetsonNano framebuffer テキストリンク

はじめに

Jetson Nano / Xavier NX で SPI 接続ディスプレイが動くようになったので、Framebuffer Driver
を使用して静止画や動画を表示させてみました。

Framebuffer Driver とは

Linux Framebuffer drivers for small TFT LCD display modules のことで、ラズパイでは SPI 接続のディスプレイにコンソールや X Windows の画面を表示する際にこのカーネルモジュールが利用されています。

環境

Jetson Nano
- JetPack4.3 (r32.3.1)
SPI 接続ディスプレイ
- 1.3' 240*240 IPS ST7789 (CS ピン無し)

接続方法

1.3' 240*240 IPS ST7789	Nano ピン番号
GND	6 (GND)
VCC	1 (3.3V)
SCL (SPI clock line)	23 (SCK)
SDA (SPI data line)	19 (MOSI)
RES	18 (GPIO 24)
DC	22 (GPIO 25)
BLK (Backlight LED Kathode)	13 (GPIO 27)

手順

1. SPI 有効化

JetPack 4.3 (r32.3.1) で追加された Jetson-IO tool を使用して I2S (aud_mclk、i2s5)、PWM (pwm1、pwm8)、SPI (spi1) を有効にします。
https://qiita.com/kitazaki/items/a445994f1f46a1b15f78

2. カーネル、カーネルモジュール (fbtft_driver) のビルド

JetsonHacks の buildKernelAndModules ツールを使って Framebuffer Driver (fbtft_driver) を有効化してビルドします。
https://qiita.com/kitazaki/items/5fc6b2e8df2bfe03e9b5

.config に以下の行を追加します。

.config

CONFIG_FB_TFT_FBTFT_DEVICE=m

カーネルをビルドする途中で質問された場合は m で答えます。

$ ./makeKernel.sh
Proposed source path: /usr/src/kernel/kernel-4.9
Source Target: /usr/src/
scripts/kconfig/conf  --silentoldconfig Kconfig
*
* Restart config...
*
*
* Support for small TFT LCD display modules
*
Support for small TFT LCD display modules (FB_TFT) [M/n/y] m
  FB driver for the AGM1264K-FL LCD display (FB_TFT_AGM1264K_FL) [N/m/?] (NEW) m
  FB driver for the BD663474 LCD Controller (FB_TFT_BD663474) [N/m/?] (NEW) m
  FB driver for the HX8340BN LCD Controller (FB_TFT_HX8340BN) [N/m/?] (NEW) m
  FB driver for the HX8347D LCD Controller (FB_TFT_HX8347D) [N/m/?] (NEW) m
  FB driver for the HX8353D LCD Controller (FB_TFT_HX8353D) [N/m/?] (NEW) m
  FB driver for the HX8357D LCD Controller (FB_TFT_HX8357D) [N/m/?] (NEW) m
  FB driver for the ILI9163 LCD Controller (FB_TFT_ILI9163) [N/m/?] (NEW) m
  FB driver for the ILI9320 LCD Controller (FB_TFT_ILI9320) [N/m/?] (NEW) m
  FB driver for the ILI9325 LCD Controller (FB_TFT_ILI9325) [N/m/?] (NEW) m
  FB driver for the ILI9340 LCD Controller (FB_TFT_ILI9340) [N/m/?] (NEW) m
  FB driver for the ILI9341 LCD Controller (FB_TFT_ILI9341) [M/n/?] m
  FB driver for the ILI9481 LCD Controller (FB_TFT_ILI9481) [N/m/?] (NEW) m
  FB driver for the ILI9486 LCD Controller (FB_TFT_ILI9486) [N/m/?] (NEW) m
  FB driver for the PCD8544 LCD Controller (FB_TFT_PCD8544) [N/m/?] (NEW) m
  FB driver for the RA8875 LCD Controller (FB_TFT_RA8875) [N/m/?] (NEW) m
  FB driver for the S6D02A1 LCD Controller (FB_TFT_S6D02A1) [N/m/?] (NEW) m
  FB driver for the S6D1211 LCD Controller (FB_TFT_S6D1121) [N/m/?] (NEW) m
  FB driver for the SSD1289 LCD Controller (FB_TFT_SSD1289) [N/m/?] (NEW) m
  FB driver for the SSD1305 OLED Controller (FB_TFT_SSD1305) [N/m/?] (NEW) m
  FB driver for the SSD1306 OLED Controller (FB_TFT_SSD1306) [N/m/?] (NEW) m
  FB driver for the SSD1325 OLED Controller (FB_TFT_SSD1325) [N/m/?] (NEW) m
  FB driver for the SSD1331 LCD Controller (FB_TFT_SSD1331) [N/m/?] (NEW) m
  FB driver for the SSD1351 LCD Controller (FB_TFT_SSD1351) [N/m/?] (NEW) m
  FB driver for the ST7735R LCD Controller (FB_TFT_ST7735R) [M/n/?] m
  FB driver for the ST7789V LCD Controller (FB_TFT_ST7789V) [M/n/?] m
  FB driver for tinylcd.com display (FB_TFT_TINYLCD) [M/n/?] m
  FB driver for the TLS8204 LCD Controller (FB_TFT_TLS8204) [M/n/?] m
  FB driver for the UC1611 LCD controller (FB_TFT_UC1611) [M/n/?] m
  FB driver for the UC1701 LCD Controller (FB_TFT_UC1701) [M/n/?] m
  FB driver for the uPD161704 LCD Controller (FB_TFT_UPD161704) [M/n/?] m
  FB driver for the WATTEROTT LCD Controller (FB_TFT_WATTEROTT) [M/n/?] m
  Generic FB driver for TFT LCD displays (FB_FLEX) [M/n/?] m
  Module to for adding FBTFT devices (FB_TFT_FBTFT_DEVICE) [M/n] m
#
# configuration written to .config
#

次にカーネルモジュールをビルドします。

$ ./makeModules.sh

ビルドが完了したら新しい Image を現在の Image にコピーして再起動します。

$ ./copyImage.sh
$ sudo reboot

3. カーネルモジュールの組み込み

(組み込み前)

$ lsmod
Module                  Size  Used by
zram                   29313  4
overlay                51662  0
nvgpu                1713284  20
spidev                 14507  0
bluedroid_pm           16059  0
ip_tables              21421  0
x_tables               38016  1 ip_tables

$ ls /dev/fb*
/dev/fb0
/dev/fb1

(組み込み)
1.3' 240*240 IPS ST7789 (CS ピン無し) を組み込む場合のコマンドです。
他のディスプレイを使用する場合は各パラメータ (fbtft_device モジュールの name=flexfb gpios=reset:15,dc:13,led:14 や flexfb の init=-1,0x11,../) の値が異なります。
また、gpios の各値 (GPIO 番号) はラズパイと異なるのでピンレイアウト比較表で確認します。

(ラズパイ)
gpios=reset:24,dc:25,led:27
↓
(Jetson Nano)
gpios=reset:15,dc:13,led:14

$ sudo modprobe fbtft_device name=flexfb gpios=reset:15,dc:13,led:14 speed=40000000 bgr=1 fps=60 custom=1 height=240 width=240 mode=3
$ sudo modprobe flexfb setaddrwin=0 width=240 height=240 init=-1,0x11,-2,120,-1,0x36,0x70,-1,0x3A,0x05,-1,0xB2,0x0C,0x0C,0x00,0x33,0x33,-1,0xB7,0x35,-1,0xBB,0x1A,-1,0xC0,0x2C,-1,0xC2,0x01,-1,0xC3,0x0B,-1,0xC4,0x20,-1,0xC6,0x0F,-1,0xD0,0xA4,0xA1,-1,0x21,-1,0xE0,0x00,0x19,0x1E,0x0A,0x09,0x15,0x3D,0x44,0x51,0x12,0x03,0x00,0x3F,0x3F,-1,0xE1,0x00,0x18,0x1E,0x0A,0x09,0x25,0x3F,0x43,0x52,0x33,0x03,0x00,0x3F,0x3F,-1,0x29,-3

(組み込み後)

$ lsmod
Module                  Size  Used by
fuse                  111691  2
flexfb                 17049  0
fbtft_device           51795  0
fbtft                  45781  2 fbtft_device,flexfb
zram                   29313  4
overlay                51662  0
nvgpu                1713284  3
spidev                 14507  0
bluedroid_pm           16059  0
ip_tables              21421  0
x_tables               38016  1 ip_tables

$ ls /dev/fb*
/dev/fb0
/dev/fb1
/dev/fb2

4. OS 起動時に自動で組み込む場合

/etc/modules にカーネルモジュールを追加します。

$ sudo vi /etc/modules

/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.

# bluedroid_pm, supporting module for bluetooth
bluedroid_pm
# modules for camera HAL
nvhost_vi
# nvgpu module
nvgpu
# 追加
fbtft_device
flexfb

/etc/modprobe.d/fbtft.conf (新規作成) にパラメータを追加します。

$ sudo vi /etc/modprobe.d/fbtft.conf

fbtft.conf

options fbtft_device name=flexfb gpios=reset:15,dc:13,led:14 speed=40000000 bgr=1 fps=60 custom=1 height=240 width=240 mode=3
options flexfb setaddrwin=0 width=240 height=240 init=-1,0x11,-2,120,-1,0x36,0x70,-1,0x3A,0x05,-1,0xB2,0x0C,0x0C,0x00,0x33,0x33,-1,0xB7,0x35,-1,0xBB,0x1A,-1,0xC0,0x2C,-1,0xC2,0x01,-1,0xC3,0x0B,-1,0xC4,0x20,-1,0xC6,0x0F,-1,0xD0,0xA4,0xA1,-1,0x21,-1,0xE0,0x00,0x19,0x1E,0x0A,0x09,0x15,0x3D,0x44,0x51,0x12,0x03,0x00,0x3F,0x3F,-1,0xE1,0x00,0x18,0x1E,0x0A,0x09,0x25,0x3F,0x43,0x52,0x33,0x03,0x00,0x3F,0x3F,-1,0x29,-3

Framebuffer Driver のテスト

$ git clone https://git.kernel.org/pub/scm/linux/kernel/git/geert/fbtest.git
$ cd fbtest
$ make
$ ./fbtest --fbdev /dev/fb2
Using drawops cfb16 (16 bpp packed pixels)
Available visuals:
  Monochrome
  Grayscale 32
  Truecolor 5:6:5:0
Using visops truecolor
Running all tests
test001: PASSED
test002: PASSED
test003: PASSED
test004: PASSED
test005: PASSED
test006: PASSED
test008: PASSED
test009: PASSED
test010: PASSED
Benchmarking... 10x10 squares: 44.75 Mpixels/s
Benchmarking... 20x20 squares: 97.85 Mpixels/s
Benchmarking... 50x50 squares: 190.24 Mpixels/s
Benchmarking... 100x100 squares: 261.87 Mpixels/s
Benchmarking... 200x200 squares: 354.09 Mpixels/s
test012: PASSED
Benchmarking... R5 circles: 19.57 Mpixels/s
Benchmarking... R10 circles: 55.88 Mpixels/s
Benchmarking... R25 circles: 123.06 Mpixels/s
Benchmarking... R50 circles: 127.81 Mpixels/s
Benchmarking... R100 circles: 218.79 Mpixels/s
test013: PASSED

静止画の表示

$ sudo apt install fbi
$ sudo fbi -d /dev/fb2 -T 1 -noverbose -a /usr/share/backgrounds/NVIDIA_Wallpaper.jpg 
$ sudo fbi -d /dev/fb2 -T 1 -noverbose -a /usr/share/backgrounds/NVIDIA_Logo.png 
$ sudo fbi -d /dev/fb2 -T 1 -noverbose -a /usr/share/backgrounds/NVIDIA_Login_Logo.png

動画の再生

$ sudo apt install mplayer
$ wget http://fredrik.hubbe.net/plugger/test.mpg
$ mplayer -nolirc -vo fbdev:/dev/fb2 -vf scale=240:160 test.mpg

Author And Source

この問題について(Jetson Nano で Framebuffer Driver を使用する), 我々は、より多くの情報をここで見つけました https://qiita.com/kitazaki/items/9f6119d7dc21cd29268e

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