Tracking Elapsed Time

[Joe Ross]

Originally Posted by kaszeta

We've found using loop counters to be very inaccurate in the past.

We've found that loop counters are accurate enough for almost all applications. One way to make them better is to account for lost radio packets.

unsigned int loop_counter;

void timer(void) {

	static unsigned char prev_packet;
	unsigned char packets;

	if (rxdata.packet_num > prev_packet)
	{
		packets = rxdata.packet_num - prev_packet;
	}
	else
	{
		packets = 256 - prev_packet + rxdata.packet_num;
	}
  loop_counter += packets;
}

note: code not guaranteed to compile, done off the top of my head.