I am changing the TX power setting of my CC2540 and read the RSSI to see the differences.
From 4 DBM up to minus 23 DBM at distances from "proximity" up to 8 meters, reading the RSSI.
I can see changes from proximity to 8 meters but these changes are equal independently of the HCI_EXT_TX_POWER DBM settings.
What stack are you using?
If you are using an old one, there were some issues regarding the transmit power.
Could you check the forum and come back if you do not find the answer in those threads?
We will be waiting for you.
Please click the Verify Answer button on a post if it answers your question! :)
Using 1.2 stack.
I can see issue for the RSSI but nothing to do with the problem or effect I encounter.
What I do not understand is:
I measure different value at different distances which so far is correct.
But when I change the TX power the value measured at different distance are still the same.
Any automatic gain correcting the return signal?
I am encountering this exact same issue, running the 1.2 BLE stack on both a 2540 and 2541. Any help would be greatly appreciated. Thanks. -Chris
Still not resolve from my part neither.
I built a small interface and use the same commands that the one sent by BTool.
I have more details:
If I move away the keyfob from the dongle, the minimum value 7F is reached earlier if I use the HCIExt_RxGain_STD and HCIExt_SetTxPower_minus_27_DBM.
I can move further with a HCIExt_RxGain_HIGH and HCIExt_SetPower_4_DBM, but not that much.
This sounds logical. But the sensibility is not progressive. Or I receive or I loose the signal.
Mean RSSI give a high value C0, C6, D7 etc... as an example and drop to 7F when the signal is too weak.
These value are measured the same independently of the RxGain or TxPower but drop to 7F earlier if set to low power and moved the keyfob away.
Does this make sense for those that build this nice Kit?
Thank you for someone that could investigate more.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.