编译px4stm32f4discovery的单板
$ make px4-stm32f4discovery_default
统计静态变量的大小
我们通过统计静态变量的大小分析，静态内存的分配是多少
yangang@ubuntu:~/work/github_proj/Firmware$ arm-none-eabi-nm --size-sort --print-size --radix=dec ./build/nuttx_px4-stm32f4discovery_default/nuttx_px4-stm32f4discovery_default.elf |grep " [bBdD] "
536880584 00000001 b autosave_disabled
536880492 00000001 b autosave_scheduled
536879372 00000001 b g_binitialized
536876464 00000001 B g_os_initstate
536879436 00000001 b g_procfs_entrycount
536875764 00000001 B g_rtc_enabled
536871936 00000001 D g_syslog_mask
536878944 00000001 b initialized.6060
536880728 00000001 b once.5953
536879540 00000001 b _ZL13shutdown_args
536879508 00000001 b _ZL21shutdown_lock_counter
536874812 00000002 b g_bkp_writable_counter
536876452 00000002 B g_lastpid
536879288 00000002 b g_retchar
536879290 00000002 b g_retchar
536878932 00000002 B g_wdnfree
536879646 00000002 b latency_actual
536879644 00000002 b latency_baseline
536879510 00000002 b _ZL16shutdown_counter
536879284 00000004 B g_binfmts
536878960 00000004 b g_cdcacm
536875760 00000004 B g_current_regs
536879428 00000004 b g_devno
536876152 00000004 b g_irqerrno
536879368 00000004 b g_optptr
536879432 00000004 b g_procfs_entries
536875792 00000004 B g_root_inode
536871940 00000004 D g_syslog_channel
536877720 00000004 B g_system_timer
536879548 00000004 B idle_wastecounter
536879640 00000004 b last_count.7127
536879376 00000004 B optarg
536871960 00000004 D optind
536871956 00000004 D optopt
536879544 00000004 b orb_log_message_pub
536879300 00000004 b p5s
536880556 00000004 B param_changed_storage
536880548 00000004 b param_export_perf
536880464 00000004 b param_find_perf
536880496 00000004 b param_get_perf
536880488 00000004 b param_instance
536880500 00000004 b param_set_perf
536880504 00000004 b param_topic
536880552 00000004 b param_user_file
536880520 00000004 B param_values
536880580 00000004 b reader_lock_holders
536879296 00000004 b result.6270
536879292 00000004 b result_k.6271
536880544 00000004 B size_param_changed_storage_bytes
536879512 00000004 b _ZL14shutdown_hooks
536879500 00000004 b _ZL5g_dev
536879504 00000004 B _ZN4uORB7Manager9_InstanceE
536879632 00000008 b base_time.7126
536879584 00000008 b callout_queue
536877712 00000008 B g_basetime
536876164 00000008 B g_delayed_kufree
536879448 00000008 b g_desalloc
536879440 00000008 B g_desfree
536876468 00000008 b g_idleargv
536876484 00000008 B g_inactivetasks
536879456 00000008 B g_msgfree
536879464 00000008 B g_msgfreeirq
536876156 00000008 B g_pendingtasks
536876456 00000008 B g_readytorun
536877680 00000008 B g_sigfreeaction
536877688 00000008 B g_sigpendingaction
536877672 00000008 B g_sigpendingirqaction
536877704 00000008 B g_sigpendingirqsignal
536877696 00000008 B g_sigpendingsignal
536876172 00000008 B g_waitingformqnotempty
536876180 00000008 B g_waitingformqnotfull
536876188 00000008 B g_waitingforsemaphore
536876476 00000008 B g_waitingforsignal
536878936 00000008 B g_wdactivelist
536877724 00000008 B g_wdfreelist
536880512 00000008 b last_autosave_timestamp
536880732 00000008 b perf_counters
536871944 00000012 d g_builtin_binfmt
536878948 00000012 b g_cu
536876856 00000016 B g_hpwork
536876872 00000016 B g_lpwork
536871964 00000020 d g_devno_sem
536872184 00000020 d g_sem
536872116 00000020 D g_spawn_parmsem
536880524 00000020 b param_sem
536880468 00000020 b param_sem_save
536872164 00000020 D __px4_log_level_str
536880560 00000020 b reader_lock_holders_lock
536880440 00000024 b autosave_work
536875768 00000024 b g_inode_sem
536879516 00000024 b _ZL13shutdown_work
536879472 00000028 B g_spawn_parms
536872204 00000028 D perf_counters_mutex
536872136 00000028 d _ZL14shutdown_mutex
536874148 00000032 b g_usart2rxfifo
536874180 00000032 b g_usart6rxfifo
536879552 00000032 b serial_dma_call.7550
536879592 00000036 B latency_counters
536879380 00000048 b g_syslog_dev
536879304 00000064 b freelist
536871984 00000129 d g_bootcodeblob
536880588 00000140 b g_bbsram
536871136 00000224 d g_usart2priv
536870912 00000224 d g_usart6priv
536876196 00000256 B g_pidhash
536872448 00000300 b g_usart6rxbuffer
536872748 00000300 b g_usart6txbuffer
536878964 00000320 b g_otgfsdev
536875796 00000356 B g_mmheap
536876492 00000364 b g_idletcb
536871360 00000576 d g_dma
536874212 00000600 b g_usart2rxbuffer
536875008 00000752 B g_intstackalloc
536876888 00000784 B g_irqvector
536879648 00000792 B system_load
536873048 00001100 b g_usart2txbuffer
536877732 00001200 b g_wdpool
分析动态内存
通过free命令
$ free