usb to suspend and ESB cannot accept data

[summer]

Hi everyone, I use nrf52833 to make dongle. My test found that after suspend of usb, I tried to enable ESB rx mode, but I couldn't receive rf data. What is the problem?The functionality I want is to enable ESB TX when USB is in suspend mode and then receive rf data. How do I do this?

[Sigurd]

Hi,

Could it be that the HFXO was turned off when USB was suspended? Make sure that HFXO is running when you are sending/receiving ESB packets.

[summer]

Hi,I would like to ask how to keep HFXO in working state when usb are in suspend? Is there a code for reference?

[Sigurd]

Hi,

In the ESB examples, we only call clocks_start(), where this function is implemented as

void clocks_start( void )
{
    NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
    NRF_CLOCK->TASKS_HFCLKSTART = 1;

    while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0);
}

Instead, when you have a application that uses USB as well, you should use the clock driver, and call  the function nrf_drv_clock_hfclk_request()

https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/hardware_driver_clock.html?cp=8_1_2_0_0_1#hardware_driver_clock_hfclk

[summer]

hi，Thank you very much。 My tests found that when USB goes to suspend，if hfclk is running,when using this function (app_usbd_wakeup_req() ) to wake up the host, it was discovered that hfclk must be turned off first,Otherwise, USB cannot wake up the host.Do you have any problems? In short, hfclk must be turned off before the device wakes up the host

[Sigurd]

Hi,

No, that sounds strange. I have not seen such issue before.