发送+++命令后,您必须从串行读取权限,因为这是xbee写入'OK'的地方。尊重守卫时间的更好方法是等待答复,然后测试以确定它是否“正常”。
这是我的代码,我不记得它是否在最后一次检查时工作,但我只是将它粘贴到此处,并且可以随意修改它。它所做的全部是广播A1,B2,C3等。
有很多评论我在试验的地方,但常规评论是信息性的。确保你一步一步地完成它,这很简单。如果您想广播,请不要忘记将目标地址更改为0xFFFF。
最后你会得到同样的认识,AT模式不适合通过编写程序来配置xbee。
例如,我有一个xbee在不停地发送数字'2',并且当另一个xbee使用此代码进入命令模式时,它应该收到'OK'消息时从远程xbee收到数字2来自本地的xbee,因此程序没有承认它处于命令模式并断开。当进入命令模式时,你会认为xbee会将它的接收器关闭,但事实并非如此,所以你很容易陷入困境。
如果您想以正确的方式进行操作,请查看API模式。我有系列1 xbee,所以我正在实施Digimesh协议,到目前为止,我还没有在网上看到任何人,但它几乎与Zigbee完全相同,所以很容易。如果你想我可以给你我的代码,可以作为一个简单的例子。
/*
unicast_configure
Configure an XBee for unicast transmission and transmit
some characters to test
*/
#include <SoftwareSerial.h>
// Pins on Bees Shield:
SoftwareSerial xbee(2, 3); // TX, RX
boolean configured;
char c = 'A';
boolean configureRadio() {
// Set the data rate for the SoftwareSerial port:
xbee.begin(9600);
// Put the radio in command mode:
Serial.write("Entering command mode\r");
delay(1000);
while(xbee.available()>0) {xbee.read();}
xbee.write("+++");
while(xbee.available()>0) {xbee.read();}
//delay(1000);
//while(xbee.available() > 0) {Serial.write(xbee.read());}
String ok_response = "OK\r"; // The response we expect
// Read the text of the response into the response variable
// This satisfies the guard time by waiting for the OK message
String response = String("");
while (response.length() < ok_response.length()) {
if (xbee.available() > 0) {
response += (char) xbee.read();
}
}
Serial.println("response1: " + response);
// If we got received OK, configure the XBee and return true:
if (response.equals(ok_response)) {
Serial.println("Enter command mode successful");
// Restore to default values:
Serial.println("Restoring default values before making changes");
xbee.write("ATRE\r");
Serial.println("Setting addr high");
xbee.write("ATDH0\r"); // Destination high
//while(xbee.available() > 0) {Serial.write(xbee.read());}
Serial.println("Setting addr low");
xbee.write("ATDL1\r"); // Destination low-REPLACE THIS
//while(xbee.available() > 0) {Serial.write(xbee.read());}
Serial.println("Setting MY address");
xbee.write("ATMYFFFF\r");
// Apply changes:
Serial.println("Applying changes");
xbee.write("ATAC\r");
/*
///////////////////////////////////////////////
// Write to non-volatile memory:
// Use similar technique as above to satisfy guard time
Serial.write("Saving\r");
xbee.write("ATWR\r");
String response2 = String("");
//while (xbee.available() > 0) {Serial.write(xbee.read());}
while (response2.length() < ok_response.length()) {
if (xbee.available() > 0) {
response2 += (char) xbee.read();
}
}
Serial.println("response2: " + response2);
if (response2.equals(ok_response)) {
Serial.println("Save successful");
}
else { Serial.println("Save not successful");
return false;
}
// And reset module:
Serial.println("Resetting");
xbee.write("ATFR\r");
///////////////////////////////////////////////
*/
Serial.write("Exit command mode\r");
xbee.write("ATCN\r"); // Exit command mode
//while(xbee.available() > 0) {Serial.write(xbee.read());}
Serial.write("Finished\r");
return true;
} else {
return false; // This indicates the response was incorrect
}
}
void setup() {
Serial.begin(9600); // Begin serial
configured = configureRadio();
}
void loop() {
// Test transmission:
if (configured) {
xbee.print(c);
Serial.print(c);
c = c + 1;
if (c > 'Z') { c = 'A'; }
}
else {
Serial.println("Not configured (in loop)");
delay(5000);
Serial.println("Retrying configuration");
configured = configureRadio();
}
delay(1500);
}