[翻译完成] 用vcgencmd获取树莓派硬件状态数据

命令可用性

这些是从固件(版本362371)中获得的命令.

vcgencmd命令

显示可用的命令列表.

root@raspberrypi:~# vcgencmd commands
commands="vcos, ap_output_control, ap_output_post_processing, vchi_test_init, vchi_test_exit,
pm_set_policy, pm_get_status, pm_show_stats, pm_start_logging, pm_stop_logging, version, commands,
set_vll_dir, led_control, set_backlight, set_logging, get_lcd_info, set_bus_arbiter_mode,
cache_flush, otp_dump, codec_enabled, measure_clock, measure_volts, measure_temp, get_config,
hdmi_ntsc_freqs, render_bar, disk_notify, inuse_notify, sus_suspend, sus_status, sus_is_enabled,
sus_stop_test_thread, egl_platform_switch, mem_validate, mem_oom, mem_reloc_stats, file,
vctest_memmap, vctest_start, vctest_stop, vctest_set, vctest_get"

vcgencmd measure_clock <clock>

显示时序, 可指定arm, core, h264, isp, v3d, uart, pwm, emmc, pixel, vec, hdmi, dpi.

root@raspberrypi:~# \
> for src in arm core h264 isp v3d uart pwm emmc pixel vec hdmi dpi ; do \
>     echo -e "$src:\t$(vcgencmd measure_clock $src)" ; \
> done
arm:    frequency(45)=700000000
core:   frequency(1)=250000000
h264:   frequency(28)=0
isp:    frequency(42)=250000000
v3d:    frequency(43)=250000000
uart:   frequency(22)=3000000
pwm:    frequency(25)=0
emmc:   frequency(47)=100000000
pixel:  frequency(29)=154000000
vec:    frequency(10)=0
hdmi:   frequency(9)=163682000
dpi:    frequency(4)=0

vcgencmd measure_volts <id>

显示电压. id可以是core, sdram_c, sdram_i, sdram_p, 如不指定默认为core.

root@raspberrypi:~# \
> for id in core sdram_c sdram_i sdram_p ; do \
>     echo -e "$id:\t$(vcgencmd measure_volts $id)" ; \
> done
core:   volt=1.20V
sdram_c:        volt=1.20V
sdram_i:        volt=1.20V
sdram_p:        volt=1.23V

vcgencmd measure_temp

显示BCM2835芯片的温度.

root@raspberrypi:~# vcgencmd measure_temp
temp=42.8'C

vcgencmd codec_enabled <codec>

显示指定解码器是否可用, 解码器分别有H264, MPG2, WVC1, MPG4, MJPG, WMV9. 请注意MPG2和VC1是需要购买证书的.

root@raspberrypi:~# \
> for codec in H264 MPG2 WVC1 MPG4 MJPG WMV9 ; do \
>     echo -e "$codec:\t$(vcgencmd codec_enabled $codec)" ; \
> done
H264:   H264=enabled
MPG2:   MPG2=enabled
WVC1:   WVC1=enabled
MPG4:   MPG4=enabled
MJPG:   MJPG=enabled
WMV9:   WMV9=enabled

如果你按照这篇帖子的内容设置了VP6和VP8 (WEBM)解码器, 虽然能正常工作, 但你要注意这只是实验, 你需要自行承担后果.

vcgencmd get_config [config|int|str]

显示你设置的配置参数. 参数可以是指定的参数名或者int, 用number-datatype参数显示全部配置, 用str参数以数据类型格式显示所有配置

vcgencmd get_config int
arm_freq=1000
core_freq=500
sdram_freq=600
over_voltage=6
disable_overscan=1
force_pwm_open=1

vcgencmd get_mem arm/gpu

显示CPU和GPU分别占了多少内存.

root@raspberrypi:~# vcgencmd get_mem arm && vcgencmd get_mem gpu
arm=448M
gpu=64M

vcgencmd版本

显示固件版本

root@raspberrypi:~# vcgencmd version
Jan 13 2013 16:24:29
Copyright (c) 2012 Broadcom
version 362371 (release)

对于剩余其他命令的参数和功能还不大清楚.

更多

这篇文章也列出一些vcgencmd选项