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  • Case ID: 293804
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Application of FEM chip in ESB

mingjkl

My project uses ESB for communication. In our hardware design, nrf5340 + FEM is used. Nrf5340 uses two GPIO link FEM chips to switch between PA mode and LNA mode. May I ask where the switching signals of the two gpios should be added to the ESB driver?

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  • 0

    Hi again

    Possibly you already noticed this, but in later versions of the nRF Connect SDK we finally have native support for FEM devices in the ESB library Slight smile

    Best regards
    Torbjørn

  • 0 in reply to ovrebekk

    Hello. Hate to bother, but just to confirm the ESB part. That also applies to nrf5340?

  • 0 in reply to pauleffect

    Hi Paul

    If you mean FEM with ESB then this is also supported on the nRF5340, yes.

    Best regards
    Torbjørn

  • 0 in reply to ovrebekk

    Good Day,

    We build a custom board with nrf5340 & nrf21540, all looks OK for DTS & config and I see that the
    esb_fem_for_rx_set() is available and called.
    I have the GPIO-TX/RX/PDN + MODE & ANTSEL correct wired.

    The ESB is working on the 5340DK board, so I'm sure there is something incoming. But the custom-board not receive anything.
    The config for nmp1300 is OK, the 21540 and 5340 have 3v3 volt. I/O is 3v3.

    Net-core UART0 disabled in favor for SPI0.

    mpsl_fem_enable(); is called before the esb_start_rx()

    What do I miss?

    *** Booting nRF Connect SDK v2.7.99-cs2-d73b286ff6d9 ***
*** Using Zephyr OS v3.6.99-3d01dcc251bf ***
[00:00:00.002,105] <inf> esb_prx: Enhanced ShockBurst Receiver NetCore
[00:00:00.002,441] <dbg> esb_prx: clocks_start: HF clock started
[00:00:00.002,746] <dbg> esb_prx: esb_fem_init: Fem require receiver setup
[00:00:00.002,746] <dbg> esb_prx: esb_fem_init: Fem require sender setup
[00:00:00.002,838] <inf> esb_prx: ESB initialized
[00:00:00.002,929] <inf> esb_prx: IPC bound complete
[00:00:00.002,929] <inf> esb_prx: Setting up for packet receiption

    CONFIG_DT_HAS_NORDIC_NRF21540_FEM_ENABLED=y
CONFIG_DT_HAS_NORDIC_NRF21540_FEM_SPI_ENABLED=y
..
CONFIG_MPSL_FEM_ONLY=y
CONFIG_MPSL_FEM_ANY_SUPPORT=y
CONFIG_MPSL_FEM_NRF21540_GPIO_SUPPORT=y
CONFIG_MPSL_FEM_NRF21540_GPIO_SPI_SUPPORT=y
CONFIG_MPSL_FEM_NCS_SUPPORTED_FEM_USED=y
CONFIG_MPSL_FEM_API_AVAILABLE=y
CONFIG_MPSL_FEM=y
# CONFIG_MPSL_FEM_NRF21540_GPIO is not set
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_MPSL_FEM_NRF21540_RX_GAIN_DB=13
CONFIG_MPSL_FEM_NRF21540_RUNTIME_PA_GAIN_CONTROL=y
CONFIG_MPSL_FEM_POWER_MODEL=y
CONFIG_MPSL_FEM_POWER_MODEL_NRF21540_USE_BUILTIN=y
CONFIG_MPSL_FEM_BUILTIN_POWER_MODEL_UPDATE_PERIOD=2000
CONFIG_MPSL_FEM_DEVICE_CONFIG_254=y
CONFIG_MPSL_FEM_INIT_PRIORITY=50
# CONFIG_MPSL_FEM_LOG_LEVEL_OFF is not set
# CONFIG_MPSL_FEM_LOG_LEVEL_ERR is not set
# CONFIG_MPSL_FEM_LOG_LEVEL_WRN is not set
# CONFIG_MPSL_FEM_LOG_LEVEL_INF is not set
CONFIG_MPSL_FEM_LOG_LEVEL_DBG=y
# CONFIG_MPSL_FEM_LOG_LEVEL_DEFAULT is not set
CONFIG_MPSL_FEM_LOG_LEVEL=4
..
CONFIG_FEM_AL_LIB=y
CONFIG_FEM=y
CONFIG_NRF21540_FEM=y
..
CONFIG_ESB=y
CONFIG_ESB_MAX_PAYLOAD_LENGTH=32
CONFIG_ESB_TX_FIFO_SIZE=8
CONFIG_ESB_RX_FIFO_SIZE=8
CONFIG_ESB_PIPE_COUNT=8
CONFIG_ESB_RADIO_IRQ_PRIORITY=1
CONFIG_ESB_EVENT_IRQ_PRIORITY=2
..
CONFIG_ESB_SYS_TIMER2=y
CONFIG_ESB_SYS_TIMER_INSTANCE=2

    Can you help?

    I measure the pins at nrf21540 after esb_start_rx()
    RX = 3v
    TX = 0v
    PDN = 3v
    CSN = 3v  <--- that should be 0V as described in the product specs 4446_194 v1.0 / 2020-08-20

    Update: Product Spec 4446_194 v1.2 / 2022-01-28, download from the Web, show that the CSN is a non't care (striped out)


    so I add a loop in the netcore's main()

    bool rxon=false;
       for (;;) {
           if (rxon) {
             esb_stop_rx();
           }
           else {
             esb_start_rx();
           }
           rxon = !rxon;
           LOG_DBG("RX is %s", rxon?"on":"off" );
           k_sleep(K_MSEC(5000));
       }

    RTT-Viewer:
    [00:00:55.004,821] <dbg> esb_prx: main: RX is off      ----> and the CSN pin is 0V
    [00:01:00.004,974] <dbg> esb_prx: main: RX is on     -----> and the CSN pin is 3V

    This way never receive anything.

Reply
  • 0 in reply to ovrebekk

    Good Day,

    We build a custom board with nrf5340 & nrf21540, all looks OK for DTS & config and I see that the
    esb_fem_for_rx_set() is available and called.
    I have the GPIO-TX/RX/PDN + MODE & ANTSEL correct wired.

    The ESB is working on the 5340DK board, so I'm sure there is something incoming. But the custom-board not receive anything.
    The config for nmp1300 is OK, the 21540 and 5340 have 3v3 volt. I/O is 3v3.

    Net-core UART0 disabled in favor for SPI0.

    mpsl_fem_enable(); is called before the esb_start_rx()

    What do I miss?

    *** Booting nRF Connect SDK v2.7.99-cs2-d73b286ff6d9 ***
*** Using Zephyr OS v3.6.99-3d01dcc251bf ***
[00:00:00.002,105] <inf> esb_prx: Enhanced ShockBurst Receiver NetCore
[00:00:00.002,441] <dbg> esb_prx: clocks_start: HF clock started
[00:00:00.002,746] <dbg> esb_prx: esb_fem_init: Fem require receiver setup
[00:00:00.002,746] <dbg> esb_prx: esb_fem_init: Fem require sender setup
[00:00:00.002,838] <inf> esb_prx: ESB initialized
[00:00:00.002,929] <inf> esb_prx: IPC bound complete
[00:00:00.002,929] <inf> esb_prx: Setting up for packet receiption

    CONFIG_DT_HAS_NORDIC_NRF21540_FEM_ENABLED=y
CONFIG_DT_HAS_NORDIC_NRF21540_FEM_SPI_ENABLED=y
..
CONFIG_MPSL_FEM_ONLY=y
CONFIG_MPSL_FEM_ANY_SUPPORT=y
CONFIG_MPSL_FEM_NRF21540_GPIO_SUPPORT=y
CONFIG_MPSL_FEM_NRF21540_GPIO_SPI_SUPPORT=y
CONFIG_MPSL_FEM_NCS_SUPPORTED_FEM_USED=y
CONFIG_MPSL_FEM_API_AVAILABLE=y
CONFIG_MPSL_FEM=y
# CONFIG_MPSL_FEM_NRF21540_GPIO is not set
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_MPSL_FEM_NRF21540_RX_GAIN_DB=13
CONFIG_MPSL_FEM_NRF21540_RUNTIME_PA_GAIN_CONTROL=y
CONFIG_MPSL_FEM_POWER_MODEL=y
CONFIG_MPSL_FEM_POWER_MODEL_NRF21540_USE_BUILTIN=y
CONFIG_MPSL_FEM_BUILTIN_POWER_MODEL_UPDATE_PERIOD=2000
CONFIG_MPSL_FEM_DEVICE_CONFIG_254=y
CONFIG_MPSL_FEM_INIT_PRIORITY=50
# CONFIG_MPSL_FEM_LOG_LEVEL_OFF is not set
# CONFIG_MPSL_FEM_LOG_LEVEL_ERR is not set
# CONFIG_MPSL_FEM_LOG_LEVEL_WRN is not set
# CONFIG_MPSL_FEM_LOG_LEVEL_INF is not set
CONFIG_MPSL_FEM_LOG_LEVEL_DBG=y
# CONFIG_MPSL_FEM_LOG_LEVEL_DEFAULT is not set
CONFIG_MPSL_FEM_LOG_LEVEL=4
..
CONFIG_FEM_AL_LIB=y
CONFIG_FEM=y
CONFIG_NRF21540_FEM=y
..
CONFIG_ESB=y
CONFIG_ESB_MAX_PAYLOAD_LENGTH=32
CONFIG_ESB_TX_FIFO_SIZE=8
CONFIG_ESB_RX_FIFO_SIZE=8
CONFIG_ESB_PIPE_COUNT=8
CONFIG_ESB_RADIO_IRQ_PRIORITY=1
CONFIG_ESB_EVENT_IRQ_PRIORITY=2
..
CONFIG_ESB_SYS_TIMER2=y
CONFIG_ESB_SYS_TIMER_INSTANCE=2

    Can you help?

    I measure the pins at nrf21540 after esb_start_rx()
    RX = 3v
    TX = 0v
    PDN = 3v
    CSN = 3v  <--- that should be 0V as described in the product specs 4446_194 v1.0 / 2020-08-20

    Update: Product Spec 4446_194 v1.2 / 2022-01-28, download from the Web, show that the CSN is a non't care (striped out)


    so I add a loop in the netcore's main()

    bool rxon=false;
       for (;;) {
           if (rxon) {
             esb_stop_rx();
           }
           else {
             esb_start_rx();
           }
           rxon = !rxon;
           LOG_DBG("RX is %s", rxon?"on":"off" );
           k_sleep(K_MSEC(5000));
       }

    RTT-Viewer:
    [00:00:55.004,821] <dbg> esb_prx: main: RX is off      ----> and the CSN pin is 0V
    [00:01:00.004,974] <dbg> esb_prx: main: RX is on     -----> and the CSN pin is 3V

    This way never receive anything.

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