NCS 3.0.1
nrf52840
nrf21540
I have read several tickets regarding antenna diversity and BLE. It does not seem to be supported for BLE. What about Thread?
I have read https://nrfconnectdocs.nordicsemi.com/ncs/3.0.1/nrfxlib/nrf_802154/doc/antenna_diversity.html , which describes the antenna diversity module.
It sounds like antenna diversity is handled by the radio driver.. Is that correct?
Do I need to select an antenna in the application? or will the driver choose the best one?
dts
nrf_radio_fem: nrf21540_fem {
compatible = "nordic,nrf21540-fem";
tx-en-gpios = <&gpio0 22 GPIO_ACTIVE_HIGH>;
rx-en-gpios = <&gpio0 19 GPIO_ACTIVE_HIGH>;
pdn-gpios = <&gpio0 23 GPIO_ACTIVE_HIGH>;
ant-sel-gpios = <&gpio0 20 GPIO_ACTIVE_HIGH>;
mode-gpios = <&gpio1 7 GPIO_ACTIVE_HIGH>;
spi-if = <&nrf_radio_fem_spi>;
supply-voltage-mv = <3000>;
};
fem_spi: &spi3 {
status = "okay";
pinctrl-0 = <&spi3_default_alt>;
pinctrl-1 = <&spi3_sleep_alt>;
pinctrl-names = "default", "sleep";
cs-gpios = <&gpio0 21 GPIO_ACTIVE_LOW>;
nrf_radio_fem_spi: nrf21540_fem_spi@0 {
compatible = "nordic,nrf21540-fem-spi";
status = "okay";
reg = <0>;
spi-max-frequency = <8000000>;
};
};
snippet: fem.conf
CONFIG_MPSL=y CONFIG_MPSL_FEM=y CONFIG_MPSL_FEM_NRF21540_GPIO=y CONFIG_MPSL_FEM_NRF21540_GPIO_SPI=y CONFIG_MPSL_FEM_NRF21540_TX_GAIN_DB=10 CONFIG_MPSL_FEM_NRF21540_TX_GAIN_DB_POUTA=20 CONFIG_MPSL_FEM_NRF21540_TX_GAIN_DB_POUTB=10 CONFIG_BT_CTLR_TX_PWR_ANTENNA=22 CONFIG_MPSL_FEM_NRF21540_RUNTIME_PA_GAIN_CONTROL=y
According to the ai answer to this, antenna diversity is supported for Thread. It suggested that there KConfig options for enabling it, but I can't find any. The documentation doesn't mention anyu. Is it enough to enable ant-sel in the dts? or do I need a KConfig setting?
Mary