This is the documentation for the latest (main) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

nordic,nrf21540-fem¶

Vendor: Nordic Semiconductor

Description¶

This is a representation of the nRF21540 Radio Front-End module

Properties¶

Properties not inherited from the base binding file.

Name	Type	Details
`tx-en-gpios`	`phandle-array`	GPIO of the SOC controlling TX_EN pin of the nRF21540
`rx-en-gpios`	`phandle-array`	GPIO of the SOC controlling RX_EN pin of the nRF21540
`pdn-gpios`	`phandle-array`	GPIO of the SOC controlling PDN pin of the nRF21540
`ant-sel-gpios`	`phandle-array`	GPIO of the SOC controlling ANT-SEL pin of the nRF21540
`mode-gpios`	`phandle-array`	GPIO of the SOC controlling MODE pin of the nRF21540
`spi-if`	`phandle`	Reference to the nordic,nrf21540-fem-spi SPI bus interface. This must be present to support SPI control of the FEM.
`tx-en-settle-time-us`	`int`	Settling time in microseconds from state PG to TX. Default value is based on Table 6 of the nRF21540 Product Specification (v1.0), and can be overridden for tuned configurations. Default value: `11`
`rx-en-settle-time-us`	`int`	Settling time in microseconds from state PG to RX. Default value is based on Table 6 of the nRF21540 Product Specification (v1.0), and can be overridden for tuned configurations. Default value: `11`
`pdn-settle-time-us`	`int`	Settling time in microseconds from state PD to PG. Default value is based on Table 6 of the nRF21540 Product Specification (v1.0), and can be overridden for tuned configurations. Default value: `18`
`trx-hold-time-us`	`int`	Power-off time in microseconds when changing from RX or TX to PG. Default value is based on Table 6 of the nRF21540 Product Specification (v1.0), and can be overridden for tuned configurations. Default value: `3`

Properties inherited from the base binding file, which defines common properties that may be set on many nodes. Not all of these may apply to the “nordic,nrf21540-fem” compatible.

Name	Type	Details
`status`	`string`	indicates the operational status of a device Legal values: `'ok'`, `'okay'`, `'disabled'`, `'reserved'`, `'fail'`, `'fail-sss'` See Important properties for more information.
`compatible`	`string-array`	compatible strings This property is required. See Important properties for more information.
`reg`	`array`	register space See Important properties for more information.
`reg-names`	`string-array`	name of each register space
`interrupts`	`array`	interrupts for device See Important properties for more information.
`interrupts-extended`	`compound`	extended interrupt specifier for device
`interrupt-names`	`string-array`	name of each interrupt
`interrupt-parent`	`phandle`	phandle to interrupt controller node
`label`	`string`	Human readable string describing the device (used as device_get_binding() argument) See Important properties for more information.
`clocks`	`phandle-array`	Clock gate information
`clock-names`	`string-array`	name of each clock
`#address-cells`	`int`	number of address cells in reg property
`#size-cells`	`int`	number of size cells in reg property
`dmas`	`phandle-array`	DMA channels specifiers
`dma-names`	`string-array`	Provided names of DMA channel specifiers
`io-channels`	`phandle-array`	IO channels specifiers
`io-channel-names`	`string-array`	Provided names of IO channel specifiers
`wakeup-source`	`boolean`	Property to identify that a device can be used as wake up source. When this property is provided a specific flag is set into the device that tells the system that the device is capable of wake up the system. Wake up capable devices are disabled (interruptions will not wake up the system) by default but they can be enabled at runtime if necessary.