usb to suspend and ESB cannot accept data

RE: usb to suspend and ESB cannot accept data

Sigurd — Thu, 08 Dec 2022 14:20:46 GMT

Hi,

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

RE: usb to suspend and ESB cannot accept data

summer — Thu, 08 Dec 2022 00:12:25 GMT

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

RE: usb to suspend and ESB cannot accept data

Sigurd — Wed, 07 Dec 2022 15:27:13 GMT

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

RE: usb to suspend and ESB cannot accept data

summer — Wed, 07 Dec 2022 02:34:49 GMT

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

RE: usb to suspend and ESB cannot accept data

Sigurd — Tue, 06 Dec 2022 12:19:34 GMT

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.