How can I send hid data with TIMER1_IRQHandler strict every 8ms?

[gootoomoon]

I find it unstable to send hid data, even if I set timer 1 every 8ms to send hid data.

I can catch data bag from wireshark it seems that interval of two data even close to 1ms.

How can this happen?

but if I set timer every 15ms, it become more stable.

But I need send it every 8ms, can you help?

It is very stable in lenovo N700 mouse (nrf51822)

test soft is in attachments

Best regards

MouseMovementRecorder.zip

[Håkon Alseth]

Hi,

You should send mouse-movement each connection interval, not hard code it. I suspect that your link is not getting a optimal connection interval, which makes the mouse seem sloppy.

Try:

1. Check your connection interval, you should have < 15 ms.
2. Send mouse data on the radio notification event (setup to happen x us before connection interval occurs) using the ble_radio_notification library

Best regards Håkon

[gootoomoon]

You mean this?

#define MIN_CONN_INTERVAL               MSEC_TO_UNITS(7.5, UNIT_1_25_MS)            /**< Minimum connection interval (7.5 ms). */
#define MAX_CONN_INTERVAL               MSEC_TO_UNITS(15, UNIT_1_25_MS)             /**< Maximum connection interval (15 ms). */

And I can find "ble_radio_notification" be used in nrf51_sdk_v4_4_2_33551\nrf51822\Board\nrf6310\ble\ble_app_hids_mouse but not in nrf51_sdk_v5_1_0_36092

where can I receive the radio notification event?

[Håkon Alseth]

The library is located here: C:\Nordic Semiconductor\nRF51 SDK_v5.1.0.36092\Nordic\nrf51822\Source\ble

Just add it to your project and initialize it, and the handler will then be executed x us before the connection interval occurs.

-H

[gootoomoon]

just like nrf51_sdk_v4_4_2_33551 ?

init like this

static void radio_notification_init(void)
{
    uint32_t err_code;

    err_code = ble_radio_notification_init(NRF_APP_PRIORITY_HIGH,
                                           NRF_RADIO_NOTIFICATION_DISTANCE_4560US,
                                           ble_flash_on_radio_active_evt);

  	APP_ERROR_CHECK(err_code);
}

and send data in ble_flash_on_radio_active_evt() ?

Does ble_flash_on_radio_active_evt() will be executed before the connection interval occurs

what does

void ble_flash_on_radio_active_evt(bool radio_active)
{
    m_radio_active = radio_active;
}

do?

[gootoomoon]

I try this code

void mouse_send_on_radio_active_evt(bool radio_active)
{
          m_radio_active = radio_active;
	  mouse_sensor_send();
}

/**@brief Function for initializing the Radio Notification event.
 */
static void radio_notification_init(void)
{
    uint32_t err_code;


    err_code = ble_radio_notification_init(NRF_APP_PRIORITY_HIGH,
                                           NRF_RADIO_NOTIFICATION_DISTANCE_4560US,
                                           mouse_send_on_radio_active_evt);

  	APP_ERROR_CHECK(err_code);
}

and try to executed mouse_sensor_send(); before the connection interval occurs but it's not work as I expected.