Antenna Control#

RAIL_ConfigAntenna#

RAIL_Status_t RAIL_ConfigAntenna (RAIL_Handle_t railHandle, const RAIL_AntennaConfig_t *config)

Configure antenna path and pin locations.

Warnings

• This API must be called before any TX or RX occurs. Otherwise, the antenna configurations for those functions will not take effect.

Returns

• Status code indicating success of the function call.

This function informs RAIL how to select each antenna, but not when. Antenna selection for receive is controlled by the RAIL_RxOptions_t::RAIL_RX_OPTION_ANTENNA0 and RAIL_RxOptions_t::RAIL_RX_OPTION_ANTENNA1 options (and the RAIL_RxOptions_t::RAIL_RX_OPTION_ANTENNA_AUTO combination). Antenna selection for transmit is controlled by the RAIL_TxOptions_t::RAIL_TX_OPTION_ANTENNA0 and RAIL_TxOptions_t::RAIL_TX_OPTION_ANTENNA1 options.

Although a RAIL handle is included for potential future expansion of this function, it is currently not used. That is, only one antenna configuration can be active on a chip, regardless of the number of protocols (unless the application updates the configuration upon a protocol switch), and the configuration is not saved in the RAIL instance. For optimal future compatibility, pass in a chip-specific handle, such as RAIL_EFR32_HANDLE.

RAIL_GetRfPath#

RAIL_Status_t RAIL_GetRfPath (RAIL_Handle_t railHandle, RAIL_AntennaSel_t *rfPath)

Get the default RF path.

Returns

• A status code indicating success of the function call.

If multiple protocols are used, this function returns RAIL_STATUS_INVALID_STATE if it is called and the given railHandle is not active. In that case, the caller must attempt to re-call this function later, for example when RAIL_EVENT_CONFIG_SCHEDULED trigger.