cancel
Showing results for 
Search instead for 
Did you mean: 

PSoC 4 MCU

DhDa_2432241
Contributor II

Hello,

I am using CYBLE-212019 and am scanning i-beacons the least strength of the beacon I can detect is -79 dBm. I have never saw an RSSI level weaker than this. Is this the least it can detect?

Thank you

Dheeraj

0 Likes
1 Solution
DhDa_2432241
Contributor II

Hello e.pratt_1639216​,

I got to know from Cypress that BLE 4.1 which has old Silicon has issues reporting RSSI levels beyond -79 dBm. The firmware API limits it to -79 dBm and that can't be tweaked. Since CYBLE-212019 is 4.1 compliant, the lowest RSSI level it can report is -79 dBm. This documentation should be surely updated.

Thanks

Dheeraj

View solution in original post

3 Replies
Anonymous
Not applicable

From the documentation/code:

/******************************************************************************

* Function Name: CyBle_GetRssi

***************************************************************************//**

*

*  This function reads the recorded Received Signal Strength Indicator (RSSI)

*  value for the last successfully received packet from the BLE radio

*  sub-system. This is a blocking function. No event is generated on calling

*  this function.

*

* \return

*  int8: The RSSI value of the responding device.

*

*  Information    | Description

*  -----------    | -----------

Range          | -85 <= N <= 5

*  Note            | The value is in dBm.

*  

******************************************************************************/

0 Likes
DhDa_2432241
Contributor II

Hello e.pratt_1639216​,

I got to know from Cypress that BLE 4.1 which has old Silicon has issues reporting RSSI levels beyond -79 dBm. The firmware API limits it to -79 dBm and that can't be tweaked. Since CYBLE-212019 is 4.1 compliant, the lowest RSSI level it can report is -79 dBm. This documentation should be surely updated.

Thanks

Dheeraj

View solution in original post

Anonymous
Not applicable

Good to know; You should mark your comment as the answer so that it shows up at the top for others with similar questions

Yeah, there are versions of the documentation that need to be updated or expanded to reflect questions on the forums I think.