SM6FBQ / HackRF clone - History

Remove message when rewinding input file.

For small input files this may be printed a very large number of times.

In repeat mode, rewind file as many times as needed to fill buffer.

Fixes #720.

Use some early returns to reduce deeply indented callbacks.

Merge pull request #1131 from martinling/hackrf-transfer-validation

Additional argument validation for hackrf_transfer

add parentheses to avoid compiler warning

avoids a warning from -Wparentheses

Merge pull request #1133 from martinling/hackrf-transfer-timing

Overhaul timing in hackrf_transfer

Merge pull request #1135 from martinling/clkin-detect

Add a simpler way to check CLKIN status.

Overhaul timing in hackrf_transfer.

Rather than using sleep() for 1s at a time, set up an interval timer
that will fire once per second, and wait in the main loop for either
this or some other event.

On POSIX, the timing is set up with setitimer(), which generates a
SIGALRM signal each time the timer fires. The main loop runs pause() to
wait for any signal.

On Windows, the timing is set up using CreateWaitableTimer, which
provides an event handle that is set each time the timer fires. The main
loop runs WaitForMultipleObjects() to wait on this and an interrupt
event.

The TX and RX callbacks can now stop the main loop immediately when they
stop streaming. This fixes #1019.