Here is a list of all documented struct and union fields with links to the struct/union documentation for each field:

- f -

f_bavail : statvfs
f_bfree : statvfs
f_blocks : statvfs
f_bsize : statvfs
f_favail : statvfs
f_ffree : statvfs
f_files : statvfs
f_flag : statvfs
f_frsize : statvfs
f_fsid : statvfs
f_namemax : statvfs
f_op : devfs, vfs_file_system_t, vfs_file_t
FADDR : flash_regs_t
fail() : riot::testing::test
family : _sock_tl_ep, clk_cfg_t, gnrc_tcp_ep_t, sock_ip_ep_t
fat_fs : fatfs_desc
fault : max31855_data_t
fault_q : lm75_params
FBAC : flash_regs_t
FBBUSY : flash_regs_t
FBFALLBACK : flash_regs_t
FBMODE : flash_regs_t
FBPRDY : flash_regs_t
FBPROT : flash_regs_t
FBRD : cc2538_uart_t, uart_regs_t
FBSE : flash_regs_t
FBSTROBES : flash_regs_t
fc : ieee802154_sec_aux_t
fcf_low : mrf24j40_t
FCFG1_REVISION : fcfg_regs_t
FCFG_B0_SSIZE0 : flash_regs_t
FCFG_B0_START : flash_regs_t
FCFG_B1_START : flash_regs_t
FCFG_B2_START : flash_regs_t
FCFG_B3_START : flash_regs_t
FCFG_B4_START : flash_regs_t
FCFG_B5_START : flash_regs_t
FCFG_B6_START : flash_regs_t
FCFG_B7_START : flash_regs_t
FCFG_BANK : flash_regs_t
FCFG_BNK_TYPE : flash_regs_t
FCFG_WRAPPER : flash_regs_t
fcnt : gnrc_lorawan_mcps_t, lorawan_hdr_t
fcnt_down : gnrc_lorawan_mcps_t
fcntl : vfs_file_ops
fctrl : lorawan_hdr_t
fd : async_read_t, spidev_linux_state, vcdiff_vfs_t
fd_space : spiffs_desc
FDS : LIS2DH12_CTRL_REG2_t
FEDACCTL1 : flash_regs_t
FEDACSTAT : flash_regs_t
FEFUSECTL : flash_regs_t
FEFUSEDATA : flash_regs_t
FEFUSESTAT : flash_regs_t
FEIM : cc2538_uart_t
FEMIS : cc2538_uart_t
FEN : cc2538_uart_t
FFSM_EXT_ADDR0 : cc2538_rfcore_t
FFSM_EXT_ADDR1 : cc2538_rfcore_t
FFSM_EXT_ADDR2 : cc2538_rfcore_t
FFSM_EXT_ADDR3 : cc2538_rfcore_t
FFSM_EXT_ADDR4 : cc2538_rfcore_t
FFSM_EXT_ADDR5 : cc2538_rfcore_t
FFSM_EXT_ADDR6 : cc2538_rfcore_t
FFSM_EXT_ADDR7 : cc2538_rfcore_t
FFSM_PAN_ID0 : cc2538_rfcore_t
FFSM_PAN_ID1 : cc2538_rfcore_t
FFSM_SHORT_ADDR0 : cc2538_rfcore_t
FFSM_SHORT_ADDR1 : cc2538_rfcore_t
FFSM_SRCEXTPENDEN0 : cc2538_rfcore_t
FFSM_SRCEXTPENDEN1 : cc2538_rfcore_t
FFSM_SRCEXTPENDEN2 : cc2538_rfcore_t
FFSM_SRCRESINDEX : cc2538_rfcore_t
FFSM_SRCRESMASK0 : cc2538_rfcore_t
FFSM_SRCRESMASK1 : cc2538_rfcore_t
FFSM_SRCRESMASK2 : cc2538_rfcore_t
FFSM_SRCSHORTPENDEN0 : cc2538_rfcore_t
FFSM_SRCSHORTPENDEN1 : cc2538_rfcore_t
FFSM_SRCSHORTPENDEN2 : cc2538_rfcore_t
fifo_empty : l3gxxxx_int_data_src_t
FIFO_EN : LIS2DH12_CTRL_REG5_t
fifo_mode : l3gxxxx_params_t
FIFO_mode : lis2dh12_fifo_t
fifo_overrun : l3gxxxx_int_data_src_t
FIFO_set_INT2 : lis2dh12_fifo_t
fifo_watermark : l3gxxxx_int_data_src_t, l3gxxxx_params_t
FIFO_watermark : lis2dh12_fifo_t
file : dfplayer, dfplayer_file_t, fatfs_file_desc
file_buf : littlefs2_desc_t, littlefs_desc_t
FILE_FORMAT : csd_v1_t, csd_v2_t, sdmmc_csd_mmc_t, sdmmc_csd_v1_t, sdmmc_csd_v2_t
FILE_FORMAT_GRP : csd_v1_t, csd_v2_t, sdmmc_csd_mmc_t, sdmmc_csd_v1_t, sdmmc_csd_v2_t
files : constfs_t, suit_storage_vfs_t
filt : mma7660_params_t
filter : bme680_params_t, bmx280_params_t, conn_can_raw, l3gxxxx_int_event_cfg_t
filter_ids : candev_mcp2515
filter_mode : socket_zep_t
filter_policy : nimble_autoadv_cfg_t
filter_sel : l3gxxxx_params_t
filters : candev_linux
finish : suit_storage_driver
first : priority_queue_t, ztimer64_clock
first_filter : can_conf_t
first_interface : usb_descriptor_interface_association_t
first_rtt_sample : congure_quic_snd_t
first_update : nimble_scanlist_entry_t
firstblock_buf : riotboot_flashwrite_t
firstTry : dsme::DSMEMessage
fixed_len : usbus_descr_gen_funcs_t
fl_fo : ipv4_hdr_t
flag : hd44780_t, mtd_spi_nor_params_t, pthread_spinlock_t
flags : _nib_offl_entry_t, _thread, asymcute_topic, at86rf215, at86rf2xx_t, benchmark_msg_cmd_t, benchmark_msg_ping_t, client_ep_t, coap_link_encoder_ctx_t, conn_can_raw, ctap_auth_data_header_t, dfplayer, dns_hdr_t, dose_t, encx24j600_frame_hdr, esp_now_pkt_hdr_t, gnrc_netif_hdr_t, gnrc_netif_lorawan_t, gnrc_netif_t, gnrc_rpl_dio_t, gnrc_rpl_dis_t, gnrc_rpl_opt_target_t, gnrc_sock_recv_aux_t, i2c_conf_t, ieee802154_sec_ccm_block_t, isotp_options, kw41zrf_t, ltc4150_params_t, msc_cbw_buf_t, msc_cbw_rw10_pkt_t, msc_inquiry_pkt_t, msc_mode_parameter_pkt_t, mtd_desc, ndp_nbr_adv_t, ndp_opt_pi_t, ndp_opt_ri_t, ndp_rtr_adv_t, netdev_ble_pkt_t, netdev_eth_rx_info_t, netdev_ieee802154_rx_info, netdev_ieee802154_t, nimble_autoadv_cfg_t, nimble_netif_accept_cfg_t, nimble_scanner_cfg_t, openwsn_gen_sock, saul_gpio_params_t, saul_pwm_channel_t, sock_ip, sock_ip_aux_rx_t, sock_ip_aux_tx_t, sock_udp, sock_udp_aux_rx_t, sock_udp_aux_tx_t, soft_uart_conf_t, sx127x_lora_settings_t, tc32_conf_t, uart_conf_t, usbus_handler, usbus_urb, vfs_file_system_t, vfs_file_t
flags_a_pcs : gnrc_rpl_opt_dodag_conf_t
flags_id : gnrc_sixlowpan_ctx_t
flags_rev : gnrc_rpl_p2p_dro_t
flank : pcf857x_t
FLASH_C_E_P_R : fcfg_regs_t
FLASH_COORDINATE : fcfg_regs_t
FLASH_E_P : fcfg_regs_t
FLASH_EH_SEQ : fcfg_regs_t
FLASH_ERA_PW : fcfg_regs_t
FLASH_NUMBER : fcfg_regs_t
FLASH_OTP_DATA3 : fcfg_regs_t
FLASH_OTP_DATA4 : fcfg_regs_t
FLASH_P_R_PV : fcfg_regs_t
FLASH_PP : fcfg_regs_t
FLASH_PROG_EP : fcfg_regs_t
FLASH_SIZE : flash_regs_t
FLASH_V : fcfg_regs_t
FLASH_VHV : fcfg_regs_t
FLASH_VHV_E : fcfg_regs_t
FLASH_VHV_PV : fcfg_regs_t
flashpage : riotboot_flashwrite_t
flashpage_buf : riotboot_flashwrite_t
fletcher32 : hard_api_t
FLOCK : flash_regs_t
flush() : TwoWire, usbus_cdcacm_device
FM : LIS2DH12_FIFO_CTRL_REG_t
FMAC : flash_regs_t
FMC_REV_ID : flash_regs_t
FMSTAT : flash_regs_t
fmt_post_descriptor : usbus_descr_gen_funcs_t
fmt_pre_descriptor : usbus_descr_gen_funcs_t
fname : fatfs_file_desc, mtd_native_dev
fnwksintkey : gnrc_lorawan_key_ctx_t, gnrc_netif_lorawan_t
folder : dfplayer_file_t
font_size : aip31068_params_t
for_me : gnrc_rpl_p2p_ext_t
format : usb_req_cdcacm_coding_t, vfs_file_system_ops
forwarded : gnrc_sixlowpan_frag_sfr_stats_t
four_banks : fmc_sdram_bank_conf_t
FPAC1 : flash_regs_t
FPAC2 : flash_regs_t
FPSTROBES : flash_regs_t
FR : cc2538_uart_t
fr : congure_reno_snd_consts_t
FR : uart_regs_t
fr_cwnd_dec : congure_reno_snd_consts_t
frac : frac_t
frac_100 : pio_sm_clkdiv
fraction : ntp_timestamp_t
frag_full : gnrc_ipv6_ext_frag_stats_t, gnrc_sixlowpan_frag_stats_t
fragment_resends : gnrc_sixlowpan_frag_sfr_stats_t
fragments : gnrc_ipv6_ext_frag_stats_t, gnrc_sixlowpan_frag_stats_t
fragments_sent : gnrc_sixlowpan_frag_sfr_stats_t
frags_sent : gnrc_sixlowpan_frag_sfr_fb
fragsz : gnrc_sixlowpan_frag_hint_t
fragsz_uncomp : gnrc_sixlowpan_frag_hint_t
frame : can_pkt_t, candev_stm32_rx_fifo, debugpins_config
frame_counter : ieee802154_sec_ccm_nonce_t, ieee802154_sec_context
frame_len : encx24j600_frame_hdr
frame_sent : w5500
frame_size : w5500
frametype : ethos_t
FRDCTL : flash_regs_t
free : dsme::DSMEMessage, riot_pipe, tlsf_size_container_t
free_data : memarray_t
free_instances : lwm2m_obj_ipso_sensor_base
freq : i2c_conf_t, loramac_channel_t, pca9685_params_t, servo_pwm_params_t, uart_conf_t
freq_hop_period : sx127x_lora_settings_t
FREQ_OFFSET : ccfg_regs_t, fcfg_regs_t
frequency : semtech_loramac_channel_params_t
freshness : netstats_nb_t
frthresh : congure_reno_snd_consts_t
fruc : msc_request_sense_pkt_t
FS : LIS2DH12_CTRL_REG4_t
fs : littlefs2_desc_t, littlefs_desc_t, spiffs_desc, vfs_mount_struct
fs_op : vfs_file_system_t
fscal : cc110x_t
fscal1 : cc110x_fs_calibration_t
fscal2 : cc110x_fs_calibration_t
fscal3 : cc110x_fs_calibration_t
fsctrl1 : cc110x_config_t
FSEQPMP : flash_regs_t
fsm : debugpins_config
FSM_ACC_EP : flash_regs_t
FSM_ACC_PP : flash_regs_t
FSM_ADDR : flash_regs_t
FSM_BSLE0 : flash_regs_t
FSM_BSLE1 : flash_regs_t
FSM_BSLP0 : flash_regs_t
FSM_BSLP1 : flash_regs_t
FSM_CMD : flash_regs_t
FSM_CMP_VSU : flash_regs_t
FSM_EC_STEP_HEIGHT : flash_regs_t
FSM_ERA : flash_regs_t
FSM_ERA_OH : flash_regs_t
FSM_ERA_PUL : flash_regs_t
FSM_ERA_PW : flash_regs_t
FSM_ERR_ADDR : flash_regs_t
FSM_EX_VAL : flash_regs_t
FSM_EXECUTE : flash_regs_t
FSM_FLES : flash_regs_t
FSM_GLBCTL : flash_regs_t
fsm_lock : sock_tcp
FSM_MODE : flash_regs_t
FSM_P_OH : flash_regs_t
FSM_PE_OSU : flash_regs_t
FSM_PE_VH : flash_regs_t
FSM_PE_VSU : flash_regs_t
FSM_PGM : flash_regs_t
FSM_PGM_128 : flash_regs_t
FSM_PGM_MAXPUL : flash_regs_t
FSM_PRG_PUL : flash_regs_t
FSM_PRG_PW : flash_regs_t
FSM_PUL_CNTR : flash_regs_t
FSM_RD_H : flash_regs_t
FSM_SAV_ERA_PUL : flash_regs_t
FSM_SAV_PPUL : flash_regs_t
FSM_SECTOR : flash_regs_t
FSM_SECTOR1 : flash_regs_t
FSM_SECTOR2 : flash_regs_t
FSM_ST_MACHINE : flash_regs_t
FSM_STAT : flash_regs_t
FSM_STATE : flash_regs_t
fsm_state : ieee802154_submac
FSM_STEP_SIZE : flash_regs_t
FSM_TIMER : flash_regs_t
FSM_VSTAT : flash_regs_t
FSM_WR_ENA : flash_regs_t
FSPRD : flash_regs_t
FSS : LIS2DH12_FIFO_SRC_REG_t
fss : spi_conf_t
fstat : vfs_file_ops
FSWSTAT : flash_regs_t
fsync : vfs_file_ops
FTCR : flash_regs_t
FTCTL : flash_regs_t
FTH : LIS2DH12_FIFO_CTRL_REG_t
ftm_chan : pwm_conf_t
full : gnrc_sixlowpan_frag_sfr_stats_t
full_res : adxl345_params_t
func : entropy_source_mbedtls_riot_t, trickle_callback_t
funcs : usbus_descr_gen
function_lock : sock_tcp
function_select : gpio_io_ctrl_t
FVHVCT1 : flash_regs_t
FVHVCT2 : flash_regs_t
FVHVCT3 : flash_regs_t
FVNVCT : flash_regs_t
FVREADCT : flash_regs_t
FVSLP : flash_regs_t
FVWLCT : flash_regs_t
FWFLAG : flash_regs_t
FWLOCK : flash_regs_t
FWPWRITE0 : flash_regs_t
FWPWRITE1 : flash_regs_t
FWPWRITE2 : flash_regs_t
FWPWRITE3 : flash_regs_t
FWPWRITE4 : flash_regs_t
FWPWRITE5 : flash_regs_t
FWPWRITE6 : flash_regs_t
FWPWRITE7 : flash_regs_t
FWPWRITE_ECC : flash_regs_t
FX_EVENT : sdmmc_card_status_t