19、树莓派实用指南：vcgencmd命令、Pi Zero设置与交叉编译

树莓派实用指南：vcgencmd命令、Pi Zero设置与交叉编译

1. vcgencmd命令详解

vcgencmd是树莓派特有的命令，其可执行文件位于 /usr/bin/vcgencmd ，能报告电压、温度等树莓派特定属性。该命令没有手册页，但可以使用 commands 选项列出所有支持的选项：

# vcgencmd commands
commands="vcos, ap_output_control, ap_output_post_processing, \
vchi_test_init, vchi_test_exit, vctest_memmap, vctest_start, \
vctest_stop, vctest_set, vctest_get, pm_set_policy, \
pm_get_status, pm_show_stats, pm_start_logging, pm_stop_logging, \
version, commands, set_vll_dir, set_backlight, set_logging, \
get_lcd_info, arbiter, cache_flush, otp_dump, test_result, \
codec_enabled, get_camera, get_mem, measure_clock, measure_volts, \
scaling_kernel, scaling_sharpness, get_hvs_asserts,  \
get_throttled, \
measure_temp, get_config,