CC2642R: How to parse HCI_ReadTransmitPowerLevelCmd response event HCI_READ_TRANSMIT_POWER

Mehul Dalal

Part Number: CC2642R

I have called HCI_ReadTransmitPowerLevelCmd(0, HCI_READ_CURRENT_TX_POWER_LEVEL) in my application. The BLE stack is responding back with anther event HCI_READ_TRANSMIT_POWER.

However, the user manual of HCI api on above does not specify how to parse the data i the event HCI_READ_TRANSMIT_POWER. I am getting below data:

Transmit Power Read pMsg->pReturnParam[0] = 0
Transmit Power Read pMsg->pReturnParam[1] = 0
Transmit Power Read pMsg->pReturnParam[2] = 0
Transmit Power Read pMsg->pReturnParam[3] = 24

Which index gives the transmit power read by the BLE stack?

over 3 years ago

0 Ammar N over 3 years ago

TI__Mastermind 25810 points

Hey Mehul,

Index 3 provides the transmit power.

Here's a quick how to with code: https://sunmaysky.blogspot.com/2019/09/how-to-read-tx-power-from-cc2640r2-ble.html

0 Mehul Dalal over 3 years ago in reply to Ammar N

Expert 2140 points

Thanks. So, what below values read signifies?

Transmit Power Read pMsg->pReturnParam[0] = 0
Transmit Power Read pMsg->pReturnParam[1] = 0
Transmit Power Read pMsg->pReturnParam[2] = 0
Transmit Power Read pMsg->pReturnParam[3] = 24

Index 3 gives 24. What does that actually mean?

+1 Ammar N over 3 years ago in reply to Mehul Dalal

TI__Mastermind 25810 points

I read this as the transmit power is 24 dBm.

0 Mehul Dalal over 2 years ago in reply to Ammar N

Expert 2140 points

Hi Ammar,

Is that even possible for CC2642? It cannot have more than 5 dBm transmit power set. How can the BLE stack read 24 dBm?

Mehul

0 Ammar N over 2 years ago in reply to Mehul Dalal

TI__Mastermind 25810 points

Hey Mehul,

What hardware are you running on? Depending on your hardware configuration, if you have a PA then you can read higher transmit power.

Can you try this on a launchpad and using a simple_peripheral example?

0 Mehul Dalal over 2 years ago in reply to Ammar N

Expert 2140 points

Hi Ammar,

I am running the firmware on the TI LP having CC2642 only.

Mehul

0 Ammar N over 2 years ago in reply to Mehul Dalal

TI__Mastermind 25810 points

Hey Mehul,

I tried running this command on the simple_peripheral example and saw the TX power was 0 dbm. This is the default setting in our example. Can you try to reproduce this on your LP?

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CC2642R: How to parse HCI_ReadTransmitPowerLevelCmd response event HCI_READ_TRANSMIT_POWER