Filippos Tragas

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12 years, 1 month ago.

Turn remote LED on/off + xbee

Hi guys, i am trying to send commands from the FRDM KL25Z board where i have attached a xbee coordinator in API mode to a remote Xbee router configured in AT mode in order to turn on/off a remote LED on pin DI/O 3. I don't know how to get response from the Xbee router so that i know that it actually works.The code i have written is this:

#include "mbed.h"
 
Serial pc(USBTX, USBRX); // tx, rx
Serial xbee(PTD3, PTD2); // tx, rx
DigitalOut myled(LED1);
DigitalOut mypins(PTD0);
int main()
{
int value;
     pc.baud(9600);
    xbee.baud(9600);
   char mychar1;
   char mychar2;
   value= 0x05;
   while (1) {
                if (value == 0x05)
                {      value = 0x04;
                       myled = 0;
                }   
                else 
                {
                         value = 0x05;
                         myled = 1;
                }
                 xbee.putc(0x7E);         //start byte of API frame
                 xbee.putc(0x0);          //high part of length.It always zero
                 xbee.putc(0x10);         //low part of length.The number of bytes that follow,not including checksum
                 xbee.putc(0x17);         // frame type.In this case 0x17 is a remote AT command
                 xbee.putc(0x0);         //Frame ID.No acknowledgment is needed.The remote xbee will receive what we send 
                 xbee.putc(0x0);
                 xbee.putc(0x0);
                 xbee.putc(0x0);              
                 xbee.putc(0x0);
                 xbee.putc(0x0);
                 xbee.putc(0xFF);  // 0xFF for broadcast
                 xbee.putc(0xFF);  // 0xFF for broadcast
                 xbee.putc(0xFF);   // Destination Network Adress. 16 bit of recipient or 0xFFFE
                 xbee.putc(0xFE);   // Destination Network Adress 0xFE-broadcast
                 xbee.putc(0x02);   // 0x02 to apply changes immediately or remote        
                 xbee.putc('D');    // command name in ASCII characters
                 xbee.putc('3');             
                 mychar1 = xbee.putc(value); // turn LED on/off.Command data in as many bytes as needed
                 pc.printf("%x",mychar1);
                 long sum = (0x17 + 0xFF + 0xFF + 0xFF + 0xFE + 0x02 + 'D' + '3' + value); //checksum is all bytes after length bytes
                 mychar2 = xbee.putc( 0xFF- sum & 0xFF); //calculate the proper checksum
                 pc.printf("%x",mychar2);
                 wait(5);
            }
 }
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