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

- u -

• uart : uart_isr_ctx
• unhandled_nack_timeout : dif_i2c_controller_halt_events
• unlock_key : owner_block
• unlock_mode : boot_svc_ownership_unlock_req
• update_mode : owner_block
• upload : dif_spi_device_flash_command
• usage_constraint : owner_application_key
• usbdev : usbdev_isr_ctx
• use_tx_d_se0 : dif_usbdev_config