Hello All,
I have taken usbd_ble_uart_freertos example and modified it for USB MIDI example (taken from Github) for nRF5 SDK and modified it to use nRF52833 SoC.
I am using Segger Embedded Studio on Windows 10 PC and EVK of ublox having NINA-B406 MCU.
USB MIDI is working fine until I press any button on the EVK. Code executes for button event and MIDI message is sent to PC Music application over USB and I can see the change accordingly in PC Music application. But after that the code resets - I can see in device manager is refreshed whenever I press any of the two buttons configured in the code.
Below is the part of code for UBS thread:
// Enter main loop.
for (;;)
{
/* Waiting for event */
UNUSED_RETURN_VALUE(ulTaskNotifyTake(pdTRUE, USB_THREAD_MAX_BLOCK_TIME));
while (app_usbd_event_queue_process())
{
/* Nothing to do */
NRF_LOG_INFO ("USB event processed");
}
}
I debugged the code and found that app_usbd_event_queue_process () is completed successfully when button is pressed, but after that when it goes to execute
UNUSED_RETURN_VALUE(ulTaskNotifyTake(pdTRUE, USB_THREAD_MAX_BLOCK_TIME));
line. In this function when
taskEXIT_CRITICAL();
instruction is executed after that the debug shows "Unknown function at 0x00000A06".
After that it shows Hardfault error.
for Button, I have used below code:
ret = bsp_init(BSP_INIT_BUTTONS, bsp_event_handler);
UNUSED_RETURN_VALUE(bsp_event_to_button_action_assign(BSP_BOARD_BUTTON_0,
BSP_BUTTON_ACTION_RELEASE,
BTN_MIDI_KEY_0_RELEASE));
Button press event is detected and it goes to execute bsp_event_handler.
Any help / guide to resolve this crash?
Or is there any example of button with FreeRTOS? it will also be helpful as a starting point.
Regards.
