CC2430+SimpliciTI: Typical RSSI and LQI values

FordFairlane

Other Parts Discussed in Thread: CC2430, SIMPLICITI, Z-STACK, CC2530

Hello

I have 2 custom boards on the table, I get RSSI=-46 and LQI=108, are these values too bad?, the distance between the 2 boards is 20cm.

I think I should get a lower LQI value. The boards send and receive packets every second and I have never found a lost packet.

Is this source code OK?

ioctlRadioSiginfo_t r;
r.lid=1;
SMPL_Ioctl(IOCTL_OBJ_RADIO,IOCTL_ACT_RADIO_SIGINFO,&r);
Display(0,0,r.sigInfo.lqi);
Display(0,1,r.sigInfo.rssi);

Thank you

over 16 years ago

0 FordFairlane over 16 years ago

Expert 1505 points

Any help?

I've tested my boards further, the communication is ok at the same floor, but some packets are lost when I have one board at the first floor and the other one at the second floor.

LQI=107, RSSI=-56, it does not depend on the distance between the boards, why?, I think I'm doing something wrong.

Thanks in advance

0 FordFairlane over 16 years ago in reply to FordFairlane

Expert 1505 points

Hello, I've read the CC2430 datasheet, LQI in SimpliciTI is not LQI, it is correlation. The best value is 110, therefore 107 is very good. I've read in this forum that lower SimpliciTI LQI is better, but it is not true. I've also read the Z-Stack, LQI is computed using RSSI, the correlation is discarded.

How to compute LQI using correlation and RSSI?

Thanks in advance

0 Elian Lima over 15 years ago in reply to FordFairlane

Expert 1895 points

I'm really interestewith the answer of this question because I´m having the same problem. Does someone knows the answer?

Eliã Lima

0 emr spl over 12 years ago in reply to Elian Lima

Intellectual 405 points

ALso I have a problem about reading LQI? I have used CC2530 and Is there a way to get LQI values? I have searched on hal_rf and basic_rf libraries, but I have not found anything about it? could you help about it? I want to use LQI with hal_rf and basic_rf , is it possible?

Regards,

0 sumit chouhan over 11 years ago in reply to FordFairlane

Intellectual 475 points

Hi,

Can you please share the code that how to you extract the RSSI value from the received packet in SampleApp.c/ message call back function.

I am having problems here. Please if you could clear my doubts in this post:
http://e2e.ti.com/support/wireless_connectivity/f/158/p/355391/1248853.aspx#1248853

Thanks

Sub-1 GHz

Sub-1 GHz forum

CC2430+SimpliciTI: Typical RSSI and LQI values