CC2640R2L: Read the RSSI for a Tx Tone.

Hi Clement

Will this work with Tx tone on Device 1 and Rx tone on device 2 and then I will call HCI_ReadRssi() ?

According to me this event only gets raised when a beacon is received. Correct me if I am wrong.

Regards

Sudhanshu

Hi Sudhanshu,

Could you specify what you mean by "tone"? Is it a BLE packet exchanged by devices in a connection?

Regards,

Hi Clement

I use HCI_EXT_ModemTestTxCmd( HCI_EXT_TX_MODULATED_CARRIER, 1 ) api to generate tone on the specific channel. 

Meanwhile on the same channel I start ModemTestRxCmd on the other device.

At this point I need to fetch the RSSI.

Regards

Sudhanshu

Hi,

I guess you are looking for HCI_EXT_ModemTestRxCmd().

Best regards,

Hi

I guess you mis understood my scenario.

On device 1 I initiate  HCI_EXT_ModemTestTxCmd() on a specific channel i.e. channel 1. Meanwhile I call HCI_EXT_ModemTestRxCmd() on device 2 on the same channel i.e. channel 1.

Now I want to read the RSSI of received signal on device 2. So I call HCI_ReadRSSI(). But it always returns 0.

Regards

Sudhanshu

Hi Sudhanshu,

As mentioned in the documentation I linked you to, the function HCI_ReadRssiCmd should be used to read the RSSI. The HCI_GAP_EVENT_EVENT is from the stack with the status HCI_COMMAND_COMPLETE_EVENT_CODE and the opCode HCI_READ_RSSI. There you get the value of the RSSI.

Regards,

Hi

Under HCI_GAP_EVENT_EVENT  do i need to access the rssis by ( pEvent->deviceInfo.rssi ) ?

Also how do I use opcode HCI_READ_RSSI to fetch the value?

case HCI_GAP_EVENT_EVENT:
    {
      switch( pMsg->status )
      {
        case HCI_BLE_HARDWARE_ERROR_EVENT_CODE:
        {
          AssertHandler( HAL_ASSERT_CAUSE_HARDWARE_ERROR,
                         0u );
        }
        break;
      case HCI_COMMAND_COMPLETE_EVENT_CODE:
        /* Fetch the rssi with opcode HCI_READ_RSSI */
        
       // HCI_READ_RSSI;
        
        break;
        default:
        {
          ; /* Do Nothing */
        }
        break;

Regards 

Sudhanshu

Hi

int8 rssi = (int8)pMsg->pReturnParam[3];

What does the index 3 signify?

The above code always returns the value 0, before calling HCI_ReadRssi() I call  HCI_EXT_ModemTestRxCmd() .

Regards

Sudhanshu

Hi,

Just to be sure, since the beginning you have been mentioning the function "HCI_ReadRssi()". The proper function to use should rather be "HCI_ReadRssiCmd".

Regards,

Hi

Apologies for mis typing.

I am calling HCI_ReadRssiCmd() only and at opcode HCI_READ_RSSI breakpoint is also getting hit . But the value which I am getting is always 0.

Regards

Sudhanshu

Hi,

Thank you for the clarification.

When you hit the breakpoint for the HCI_READ_RSSI, could you verify if other value are inside the buffer pointed by pMsg->pReturnParam. It would also be nice to verify if the status returned is correct (it should be in pMsg->pReturnParam[0]). 

Regards,

Hi

The returned status that i am getting is 0x02 and the RSSI value is 0.

02 00 00 00 24 00 00 00 - This is what I am getting in pMsg->pReturnParameters.

Am I commiting any mistake?

Regards 

Sudhanshu

Hi,

It looks like the stack returns an error code corresponding to HCI_ERROR_CODE_UNKNOWN_CONN_ID.

Could you provide a code snippet showing how you are calling HCI_ReadRssiCmd()? In addition, are there some connections established? Is the device in test mode? Do you grant some time to the stack to "enable"  the HCI_EXT_ModemTestRxCmd() before starting the HCI_ReadRssiCmd() ?

Regards,

Hi

There are no connection established while reading the RSSI, however my device is in continuous scanning mode. No my device is not in test mode.

Yes I provide some delay between HCI_EXT_ModemTestRxCmd() and HCI_ReadRssiCmd().

static eMfgErrType RxToneEnbl( StructData * pMsg )
{
  eMfgErrType Status = eInvalidCmd;
  hciStatus_t TestStatus = FALSE;
  tUI8 ChnlNo = pMsg->pData[ 3 ];
  if( ChnlNo <= 39u )
  {
    TestStatus = HCI_EXT_ModemTestRxCmd( ChnlNo );/* Channel 0 - to be a part of command */
    if( TestStatus == HCI_SUCCESS )
    {
      memcpy( pMsg->pData, TstPass, cSizeOfRsp );
      pMsg->Len = ( cSizeOfRsp - cDataOffset );
      Status = eSuccess;
    }
    else
    {
      Status = eFailure;
    }
  }
  else
  {
     /* Invalid command */
  }
  return Status; 
}
/* ------------------------------------------------------------------------ */
static eMfgErrType ReadRssi( StructData * pMsg )
{
  eMfgErrType Status = eInvalidCmd; 
  tUI8 RssiVal = 0;
  HCI_ReadRssiCmd( 0 );
  RssiVal = FetchRSSI_g( );

  memcpy( pMsg->pData, &RspnsBuff, cSizeOfRstCntBuff );
  pMsg->Len = cSizeOfRssi + cSizeOfStatus;
  Status = eSuccess;
  return Status;  

}

PFA code snippet.

My fetch RSSI function fetches the RSSI value from my SimpleCentral.c.

Regards

Sudhanshu 

Hi Sudhanshu,

The HCI_EXT_ModemTestRxCmd() command should only be used while in test mode.

In addition the parameter passed to the function HCI_ReadRssiCmd() is supposed to be a connection handle. These two elements are probably explaining your issue.

Maybe we can find together a better way to achieve what you need. Do you want to give us some details on your use case?

Best regards,

Hi Clement

Can you share some documents regarding test mode i.e. how to use it.

My use case is as follows

My device will be working in central mode. So during production manufacturing I need to test my Tx and Rx of my BLE module.

The method which I planned is My device 1 will start with HCI_EXT_ModemTestTxCmd() on a fixed channel say channel 20.

Simultaneously my device 2( configured as simple central only ) will call HCI_EXT_ModemTestRxCmd() and after some delay, I'll call HCI_ReadRssiCmd() .

If the Rssi comes in desired range, I'll pass the test or else the test will get failed.

The same process will get repeated after interchanging the funtions of device 1 and device 2 . This way I can check my Tx and Rx are working fine or not.

Since my device can't advertise so I planned this method.

Can you suggest some other method to test my Tx and Rx of RF during production of my device configured as simple central.

Regards 

Sudhanshu