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LQI值不會改變?

zhung mao-jen
Prodigy 110 points

想提取LQI值判斷距離
afIncomingMSGPacket_t *pkt;
uint8 msgLqi = pkt->LinkQuality;

輸入以上程式後能動作，但LQI值似乎固定不變，改變距離但LED動作不變

warning  : variable "pkt" is used before its value is set

想請問是不是因為這句話寫的問題，如果是想請問該怎麼解決?