+ /*
+ * Compute the packet length as follows:
+ *
+ * 2000 bps (for a 1kHz tone)
+ * so, for 'ms' milliseconds, we need
+ * 2 * ms bits, or ms / 4 bytes
+ */
+ if (ms > (255 * 4))
+ ms = 255 * 4;
+ pkt_len = ms >> 2;
+ RF[RF_PKTLEN_OFF] = pkt_len;
+