BlueNRG-MS - SPBTLE-RF Device sometimes gets stuck at hci_tl_lowlevel_isr function

[MCANT.2]

So I am trying to use BlueNRG-MS, SPBTLE-RF device on a custom board. To use this device i tried to use BLE cube expansion with SampleApp application. I am configuring SPI and GPIO pins correctly. Project builds and loads fine but after booting but code sometimes gets in to a loop at here (in while). hci_notify_asynch_evt return 0.

1. void hci_tl_lowlevel_isr(void)
2. {
3. /* Call hci_notify_asynch_evt() */
4. while(IsDataAvailable())
5. {
6. hci_notify_asynch_evt(NULL);
7. }
8.  
9. /* USER CODE BEGIN hci_tl_lowlevel_isr */
10.  
11. /* USER CODE END hci_tl_lowlevel_isr */
12. }
13.  

any suggestions and feedback are welcome.

Thanks in advance,

Marco

[Sebastien DENOUAL]

Hi @MCANT.2​ ,

I assume your development is based on X-CUBE-BLE1, do you know the version release ?

As soon as data is ready (event or ble data) , BlueNRG-MS raised the SPI IRQ, X-CUBE-BLE1 package flush data into an internal FIFO, then application will flush this FIFO.

If this FIFO is full (due to lots of comings events, data) , you can enter in a deadlock situation where only a reset is possible. This has been solved long time ago or maybe there are still some paths to investigate.

1. Could you check your X-CUBE-BLE1 package and potentially switch to latest one.

2. Could you make sure in hci_tl_lowlevel_isr you have the test conditions if host MCU FIFO is full

void hci_tl_lowlevel_isr(void)

{

 /* Call hci_notify_asynch_evt() */

 while(IsDataAvailable())

 {

   if (hci_notify_asynch_evt(NULL))

   {

     return;

   }

 }

Regards,

Sebastien.

[MCANT.2]

Hi Sebastien,

My X-cube-ble1 version is 6.2.0 and i verified the code in hci_tl_interface.c, the function hci_tl_lowerlevel_isr() is so done:

/**

 * @brief HCI Transport Layer Low Level Interrupt Service Routine

 *

 * @param None

 * @retval None

 */

void hci_tl_lowlevel_isr(void)

{

 /* Call hci_notify_asynch_evt() */

 while(IsDataAvailable())

 {

  if (hci_notify_asynch_evt(NULL))

  {

   return;

  }

 }

 /* USER CODE BEGIN hci_tl_lowlevel_isr */

 /* USER CODE END hci_tl_lowlevel_isr */

}

My application sends by BLE ,every 25 ms, 40 bytes (a sort of real time data) and the code works but after a long time the application goes to deadlock. I have to reset the device.

Only way to exit from this deadlock is to disable spi interrupt because IsDataAvailable() return true and hci_notify_asynch_evt(NULL) return 0.

The operations :

"Disable interrupt" and then "enable interrupt" in hci_user_evt_proc() are not correct for my application because interrupts the exchange "real time" data between device and smartphone.

Any suggestions