## 技术点记录

1. linux 下播放音频
   ```bash 
   sudo apt install libasound2-dev alsa-utils
   ```
2. linux 下播放视频
   ```bash
   sudo apt install ffmpeg
   ```
   驱动安装
   ```bash
   sudo apt install libdirectfb-dev
   ```
3. 当前用户加入播放音频与视频的组中
    ```bash
    sudo usermod -aG audio,video $USER
    ```

### 关闭屏幕帧缓冲

```bash
# 关闭帧缓冲设备
echo 1 | sudo tee /sys/class/graphics/fb0/blank
# 重新打开帧缓冲设备
echo 0 | sudo tee /sys/class/graphics/fb0/blank
```

### 播放视频
```bash
ffplay -autoexit -fs -i video.mp4
```

### 编译 arm64 架构
```bash
CC=aarch64-linux-gnu-gcc CGO_ENABLED=1 GOOS=linux GOARCH=arm64 go build -o game-driver-arm64 .
```

### J8引脚
```bash
J8:
   3V3  (1) (2)  5V    
 GPIO2  (3) (4)  5V    
 GPIO3  (5) (6)  GND   
 GPIO4  (7) (8)  GPIO14
   GND  (9) (10) GPIO15
GPIO17 (11) (12) GPIO18
GPIO27 (13) (14) GND   
GPIO22 (15) (16) GPIO23
   3V3 (17) (18) GPIO24
GPIO10 (19) (20) GND   
 GPIO9 (21) (22) GPIO25
GPIO11 (23) (24) GPIO8 
   GND (25) (26) GPIO7 
 GPIO0 (27) (28) GPIO1 
 GPIO5 (29) (30) GND   
 GPIO6 (31) (32) GPIO12
GPIO13 (33) (34) GND   
GPIO19 (35) (36) GPIO16
GPIO26 (37) (38) GPIO20
   GND (39) (40) GPIO21
```