main.cpp

00001 #include "mbed.h"
00002 
00003 Serial pc(USBTX, USBRX); // tx, rx
00004 Serial device(p9, p10);  // tx, rx
00005 DigitalOut myled1(LED1);
00006 DigitalOut myled2(LED2);
00007 //RF link demo using low-cost Sparkfun RF transmitter and receiver modules
00008 //LEDs indicate link activity
00009 //Characters typed in PC terminal windows will echo back using RF link
00010 int main() {
00011     char temp=0;
00012     device.baud(2400);
00013     while (1) {
00014     
00015         //RF Transmit Code
00016         if (pc.readable()==0) {
00017             myled1 = 1;
00018             //Send 10101010 pattern when idle to keep receiver in sync and locked to transmitter
00019             //When receiver loses the sync lock (Around 30MS with no data change seen) it starts sending out noise
00020             device.putc(0xAA);
00021             myled1 = 0;
00022         } else
00023             //Send out the real data whenever a key is typed 
00024             device.putc(pc.getc());
00025             
00026         //RF Receive Code
00027         if (device.readable()) {
00028             myled2 = 1;
00029             temp=device.getc();
00030             //Ignore Sync pattern and do not pass on to PC
00031             if (temp!=0xAA) pc.putc(temp);
00032             myled2 = 0;
00033         }
00034     }
00035 }