6.3 6.4. timing issues: first micro-frame heard

Because the receiver periodically samples the channel, the micro-frame of a preamble it hears first can be any of the 50. You will now visualize which micro-frame isheard first. To this end:

• move line print_counter(packet.frame[9]); up two lines (right after MRFI_Receive(&packet); ), so that the counter value gets printed for every microframe received;
• after reprogramming a board, connect it to the host computer and read its COMx port with PuTTY;
• press on the second boards button, you should now read a series of decrementing numbers such as: 30 29 28 25 24 23 20 19 18 15 14 13 10 09 08 05 04 03 The sequence may not be continuous because the board spends some time writing on its serial port, and thus misses a few micro-frames. The first number you read is the first micro-frame received (here 30), which is not necessarily the first one sent (here 50).