Linux

Dumtux Allwinner-H616

如何设置Console文字大小

apt install console-setup
vim /etc/default/console-setup

然后找到 FONTSIZE="8X16",将其改成想要的大小，前提是要有相应的字体(在/usr/share/consolefonts/下)
参考文献（原理）:how-does-etc-default-console-setup-work

如何使用mpg123播放音乐

首先先查找alsa设备

首先切换root用户

root@debian:~# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: sndahub [sndahub], device 0: Media Stream sunxi-ahub-aif1-0 [Media Stream sunxi-ahub-aif1-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: sndahub [sndahub], device 1: System Stream sunxi-ahub-aif2-1 [System Stream sunxi-ahub-aif2-1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: sndahub [sndahub], device 2: Accompany Stream sunxi-ahub-aif2-2 [Accompany Stream sunxi-ahub-aif2-2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: allwinnerhdmi [allwinner-hdmi], device 0: hdmi i2s-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 2: Codec [H616 Audio Codec], device 0: CDC PCM Codec-0 [CDC PCM Codec-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
root@debian:~#

可以看到3.5mm耳机口连的是Card 2, device 0.
然后播放mican.mp3

mpg123 -o alsa:hw:2,0 mican.mp3

2,0 代表Card2, Device 0
成功

root@debian:~# mpg123 -o alsa:hw:2,0 mican.mp3
High Performance MPEG 1.0/2.0/2.5 Audio Player for Layers 1, 2 and 3
        version 1.26.4; written and copyright by Michael Hipp and others
        free software (LGPL) without any warranty but with best wishes

Terminal control enabled, press 'h' for listing of keys and functions.

Playing MPEG stream 1 of 1: mican.mp3 ...

MPEG 1.0 L III vbr 44100 j-s

Title:   Deadline                                               Artist: mican*
Comment: 163 key(Don't modify):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
Album:   ENGAGED DANCEHALL
Year:                                                           Genre:  Unknown

tmux在tty下调整窗口大小

因为Ctrl-B 再加方向键会直接切换窗口，

vim ~/.tmux.conf
bind -n C-H resize-pane -L 1
bind -n C-L resize-pane -R 1
bind -n C-K resize-pane -U 1
bind -n C-J resize-pane -D 1

这样就可以通过Ctrl+HJKL来调整窗口大小，就像用vim一样
参考
How do I resize tmux pane by holding down prefix and arrow key for a while?
How to adjust the Tmux pane size

查询framebuffer子系统设备的大小

root@debian:~# cat /sys/class/graphics/fb0/virtual_size
2560,1440

设置fbcon的旋转

root@debian:~# ls /sys/class/graphics/fbcon
cursor_blink  power  rotate  rotate_all  subsystem  uevent
root@debian:~# echo 1 > /sys/class/graphics/fb
fb0/   fbcon/
root@debian:~# echo 1 > /sys/class/graphics/fbcon/
cursor_blink  power/        rotate        rotate_all    subsystem/    uevent
root@debian:~# echo 1 > /sys/class/graphics/fbcon/rotate_all
root@debian:~# echo 1 > /sys/class/graphics/fbcon/rotate_all
root@debian:~# echo 0 > /sys/class/graphics/fbcon/rotate_all
root@debian:~#

向rotate_all或rotate文件写入0,1,2,3来控制旋转方向，cursor_blink来控制光标是否闪烁。
参考Querying framebuffer resolution in Linux

如何设置fbcon显示在哪个fbdev上

来源The Framebuffer Console
在boot.cmd中添加bootargs fbcon=map:1 (表示在/dev/fb1上显示)
然后记得不能直接修改boot.scr，因为其包含校验码，得用从u-boot/tools里的mkImage来生产boot.scr
来源
全志v3s学习笔记（4）——u-boot传参(boot.scr)和参数配置(script.bin)文件
linux - Beagleboard-Xm Rev. C1 修改 boot.scr 后无法启动

mkimage -A arm -O linux -T script -C none -n "My Boot" -d boot.cmd boot.scr

如何手动设置时区?

Linux设置和修改时间与时区

Linux Vitual Console(VT),和显示器(dri/fbdev)，输入的关系

How VT-switching works

有趣的东西-Linux SillySound

SillySound

tty1 的输出映射到 LCD 显示屏的 fb 设备

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