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我有2個Adafruit XBee 2模塊，每個模塊都通過一個USB集線器與1根FTDI電纜（ttyUSB0和ttyUSB1）連接到Raspberry Pi。我將兩個XBee模塊獨立配置在同一個PAN上，然後嘗試在一個while循環中讀一個，然後在另一個while循環中寫一個簡單的消息。出於某種原因，我從來沒有從第二個港口讀任何東西。RasBee Pi上的XBee Linux串行端口
這是我正在使用的測試代碼。
配置：
xbee::xbee(char* usbPort) {
/*
-> AT (check if xbee modem is responding)
<- OK
-> ATID (get current PAN)
<- 3332 (default, or something else)
-> ATID 3137 (set new id)
<- OK
-> ATID (check again)
<- 3137
-> ATWR (write the change to flash)
<- OK
*/
// Sleep for a little bit
QWaitCondition waitCondition;
QMutex mutex;
// Get a util object
Linuxutils util;
// Open a serial port
qDebug() << "Opening Serial Port:" << QString(usbPort);
char port[] = "ttyUSB1";
int fd = util.openSerialPort(port);
qDebug() << "Done opening Serial Port " << QString(usbPort) << ": " << fd;
int didConfigurePort = util.configureSerialPort(fd,9600);
qDebug() << "Did configure port successfully? " << didConfigurePort;
// Receive buffer
char rxBuffer[24];
/////////////////////////////////////////////////////////////////////////////
// Config Mode
memset(rxBuffer, 0, sizeof(rxBuffer));
char *msg = "+++";
qDebug() << "Writing config string to XBee (+++)";
util.writeToSerialPort(fd,msg);
qDebug() << "XBee written to, waiting for response of 'OK'";
while (true) {
int readNumberOfBytes = util.readFromSerialPort(fd,rxBuffer,4096);
printf("Received (%d bytes): %s\n", readNumberOfBytes,rxBuffer);
break;
}
/////////////////////////////////////////////////////////////////////////////
// AT (check if xbee modem is responding)
memset(rxBuffer, 0, sizeof(rxBuffer));
char *msg2 = "AT\n";
qDebug() << "Check if XBee is responding (AT)";
util.writeToSerialPort(fd,msg2);
qDebug() << "XBee written to, waiting for response of 'OK'";
while (true) {
int readNumberOfBytes = util.readFromSerialPort(fd,rxBuffer,4096);
printf("Received (%d bytes): %s\n", readNumberOfBytes,rxBuffer);
break;
}
/////////////////////////////////////////////////////////////////////////////
// AT (get current PAN ID)
memset(rxBuffer, 0, sizeof(rxBuffer));
char *msg3 = "ATID\n";
qDebug() << "Get XBee PAN ID (ATID)";
util.writeToSerialPort(fd,msg3);
qDebug() << "XBee written to, waiting for response which is integer of current PAN";
while (true) {
int readNumberOfBytes = util.readFromSerialPort(fd,rxBuffer,4096);
printf("Received (%d bytes): %s\n", readNumberOfBytes,rxBuffer);
break;
}
/////////////////////////////////////////////////////////////////////////////
// AT (get current PAN ID <VALUE>)
memset(rxBuffer, 0, sizeof(rxBuffer));
char *msg4 = "ATID 3137\n";
qDebug() << "Check if XBee is responding (ATID 3137)";
util.writeToSerialPort(fd,msg4);
qDebug() << "XBee written to, waiting for response after telling it to change to PAN 3137";
while (true) {
int readNumberOfBytes = util.readFromSerialPort(fd,rxBuffer,4096);
printf("Received (%d bytes): %s\n", readNumberOfBytes,rxBuffer);
break;
}
/////////////////////////////////////////////////////////////////////////////
// AT (get current PAN ID)
memset(rxBuffer, 0, sizeof(rxBuffer));
char *msg5 = "ATID\n";
qDebug() << "Get XBee PAN ID (ATID)";
util.writeToSerialPort(fd,msg5);
qDebug() << "XBee written to, waiting for response which is integer of current PAN";
while (true) {
int readNumberOfBytes = util.readFromSerialPort(fd,rxBuffer,4096);
printf("Received (%d bytes): %s\n", readNumberOfBytes,rxBuffer);
break;
}
/////////////////////////////////////////////////////////////////////////////
// AT (get current PAN ID <VALUE>)
memset(rxBuffer, 0, sizeof(rxBuffer));
char *msg6 = "ATWR\n";
qDebug() << "Write new settings to XBee Flash (ATWR)";
util.writeToSerialPort(fd,msg6);
qDebug() << "XBee written to, waiting for it to write to flash...";
while (true) {
int readNumberOfBytes = util.readFromSerialPort(fd,rxBuffer,4096);
printf("Received (%d bytes): %s\n", readNumberOfBytes,rxBuffer);
break;
}
// Close the file descriptor
close(fd);
}
閱讀：
void xbee::xbeeRead(char* usbPort) {
// Sleep
QWaitCondition waitCondition;
QMutex mutex;
waitCondition.wait(&mutex, 5000);
// Utils
Linuxutils util;
// File descriptor
int fd = util.openSerialPort(usbPort);
// Continually Read
char buffer[4096];
while (true) {
// Sleep
waitCondition.wait(&mutex, 1000);
qDebug() << "Waiting for data...";
int readNumberOfBytes = util.readFromSerialPort(fd,buffer,4096);
// Print results
printf("Read (%d bytes): %s\n", readNumberOfBytes,buffer);
}
// Close
close(fd);
}
寫：
void xbee::xbeeWrite(char *usbPort) {
// Sleep
QWaitCondition waitCondition;
QMutex mutex;
waitCondition.wait(&mutex, 5000);
// Utils
Linuxutils util;
// File descriptor
int fd = util.openSerialPort(usbPort);
// Continually Write
char *buffer = "Hello World!\n";
while (true) {
// Sleep
waitCondition.wait(&mutex, 1000);
int readNumberOfBytes = util.writeToSerialPort(fd,buffer);
// Print results
printf("Wrote (%d bytes): %s\n", readNumberOfBytes,buffer);
}
}
我可以肯定地配置每個模塊 - 這裏是輸出示例配置ttyUSB0：
Input test type: 4
Opening Serial Port: "/dev/ttyUSB0"
Done opening Serial Port "/dev/ttyUSB0" : 6
Did configure port successfully? 0
Writing config string to XBee (+++)
XBee written to, waiting for response of 'OK'
Received (3 bytes): OK
Check if XBee is responding (AT)
XBee written to, waiting for response of 'OK'
Received (3 bytes): OK
Get XBee PAN ID (ATID)
XBee written to, waiting for response which is integer of current PAN
Received (5 bytes): 3137
Check if XBee is responding (ATID 3137)
XBee written to, waiting for response after telling it to change to PAN 3137
Received (3 bytes): OK
Get XBee PAN ID (ATID)
XBee written to, waiting for response which is integer of current PAN
Received (5 bytes): 3137
Write new settings to XBee Flash (ATWR)
XBee written to, waiting for it to write to flash...
Received (3 bytes): OK
Waiting for data...
儘管我可以看到我在一個while循環中寫入ttyUSB1設備，但我在ttyUSB0上沒有收到任何東西。
任何想法，爲什麼發生這種情況？謝謝！
非常感謝！ – PhilBot