In module CC2420ControlP, I found this:
395 event void RssiResource.granted() {
396 uint16_t data;
397 call CSN.clr();
398 call RSSI.read(&data);
399 call CSN.set();
400
401 call RssiResource.release();
*402 data += 0x7f;*
403 data &= 0x00ff;
404 signal ReadRssi.readDone(SUCCESS, data);
405 }
And I want to know why plus 0x7f.
Thank you very much.
--
Best Regards,
SANG JUNJUN
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