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

### - f -

- fat_free_mass : bcs_meas_val_t
- fat_free_mass_present : bcs_meas_flag_t
- feature : bcs_init_t , cscs_init_t , gls_init_t , rscs_init_t
- feature_report : hids_init_t
- feature_report_sup : hids_init_t
- features : gap_peer_features_ind_t
- filter : gls_racp_req_t
- filter_pol : gap_adv_param_t , gap_ext_adv_param_t
- finish_transfers : hci_uart_call_t
- first_name_present : uds_chars_flag_t
- flag : ams_c_attr_info_t , wechat_pedo_meas_t , wechat_pedo_target_t
- flags : gls_meas_ctx_t , gls_meas_val_t , hids_hid_info_t
- flash_id : _exflash_handle
- flash_size : _exflash_handle
- flow_off : hci_uart_call_t
- flow_on : hci_uart_call_t
- force_clk : _cgc_init
- force_clk0 : _ll_cgc_init_t
- force_clk1 : _ll_cgc_init_t
- force_clk2 : _ll_cgc_init_t
- format : prf_char_pres_fmt_t
- fractions_256 : cts_c_exact_time_256_t , cts_exact_time_256_t
- freq : gdx_lcp_config_t , pwm_init_t
- fw_mode : _exflash_handle
- fw_rev_str : dis_init_t