Linux 擷取 4G 訊號強度__Linux

找了好多資料還是沒找到 擷取4G訊號強度的應用代碼

最後沒辦法了， 只能自己寫了

首先要知道AT指令是什麼 這個可以參考下面的串連：

https://www.cnblogs.com/yuweifeng/p/5587473.html

如果4G裝置正常運行 在終端輸入下面命令會得到裝置當前的訊號

命令：cat /dev/ttyUSB2&

echo -e "AT+CSQ\r\n" > /dev/ttyUSB2

得到：

AT+CSQ
+CSQ: 28,99
OK
AAT+CSQ
+CSQ: 28,99

28 只是 rssi 轉換成訊號格 參考文章 http://velep.com/archives/1147.html

大概瞭解一下就行了 下面是代碼 是在qt寫的，共同探討 ，歡迎留言

void MainWindow::GetCurSignalStrenght(void){printf("============Geting CurSignalStrenght============\n");int SentATcount = 100;    if(ec20check==1)    {system("cat /dev/ttyUSB2 | grep \'CSQ\' > signalstrength&");while(SentATcount--){printf("============Launch AT command============\n");system("echo -e \"AT+CSQ\\r\\n\" > /dev/ttyUSB2");printf("echo -e \"AT+CSQ\\r\\n\" > /dev/ttyUSB2\n");usleep(1000);QFile tempFile("signalstrength");if (!tempFile.open(QIODevice::ReadOnly | QIODevice::Text)){qDebug()<<"open signalstrength fail";}else{QTextStream tempLineFile(&tempFile);QString templine ;templine = tempLineFile.readLine().simplified();tempFile.close();if(!templine.isEmpty()){printf("============Get data from temp file, say oh ho!!!!============\n");break;}else{printf("============Fuck , There no useful data yet============\n");//continue wile do nothine}}}system("grep \'+CSQ:\' signalstrength > tempfilesignal");QFile signalFile("tempfilesignal");if (!signalFile.open(QIODevice::ReadOnly | QIODevice::Text)){signalStrenght = 0; qDebug()<<"open tempfilesignal fail";}else{QTextStream infile(&signalFile);QString line ;line = infile.readLine().simplified();signalFile.close();if(!line.isEmpty()){//--------------------------QString linedate ;QString rssi;bool ok;  rssi = line.mid(6,2);qDebug() << " signal number is -tmpchr>="<<rssi;printf(" tmp.toInt(&ok,10) is ->%d\n",rssi.toInt(&ok,10));int signalTrans =-113 + (2 * rssi.toInt(&ok,10));printf(" signalTrans is ->%d\n",signalTrans);if(signalTrans >-91){signalStrenght = 5;}else if(signalTrans <= -91 && signalTrans>-101){signalStrenght = 4;}else if(signalTrans <= -101 && signalTrans>-103){signalStrenght = 3;}else if(signalTrans <= -103 && signalTrans>-107){signalStrenght = 2;}else if(signalTrans <= -107 && signalTrans>-113){signalStrenght = 1;}else{ //no signalsignalStrenght = 0;}printf("=======Get signalStrenght success.= signalStrenght is %d=======\n",signalStrenght);}else{printf("=======Get signalStrenght failed...==set signalStrenght zero=======\n");signalStrenght = 0;}}}system("rm tempfilesignal -rf");}