bperrybap reported on github that the ftdi timeouts can be excessive:
"the timeout period while waiting for read data to be 10x or even 100x
longer than it should be when there are read issues on the data cable
particularly when using Android and USB OTG cables. i.e. a 5 second
read timeout for not receiving data can be as long as 7 minutes"
and the reason is that the code at one point tried to use the regular
"gettimeofday()" to handle timeouts, but that doesn't exist in Windows.
We already have Windows-specific code to sleep for a number of
milliseconds in "ftdi_serial_sleep()", let's just extend that same
concept and add a "ftdi_serial_get_msec()" that returns the number of
msec's since some arbitrary point in time.
On Windows, that's just "GetTickCount()", and in sane environments it's
just a trivial wrapper around gettimeofday() to turn sec/usec into msec.
NOTE! The actual msec value doesn't have any meaning. Only the
difference between two calls to ftdi_serial_get_msec() is meaningful.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Windows doesn't have nanosleep() unless libwinpthread is used.
Since the nanosleep() usage in serial_ftdi_sleep():
- does not break in case of EINTR
- has input in milliseconds
the WINAPI Sleep() should be a good alternative.
Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
When I switched over from our own custom IO implementation to the new
upstream custom IO model in libdivecomputer, I completely missed the
fact that the libdivecomputer custom IO model also does a custom _sleep_
function.
I'm not entirely sure what the point was, and it broke things even in
libdivecopmputer itself when some of the new sleep functions were
broken.
Anyway, we didn't export any sleep functions at all for the bluetooth,
BLE and FTDI cases, the the libdivecomputer code didn't fall back to any
sane default sleep implementation either, so the end result was no
sleeping at all.
Which didn't matter for most divecomputers.
But it seems like at least some OSTC dive computers did care, at least
in certain situations, and both Miika and Anton had trouble downloading
with their OSTC Sport dive computers. Using the serial line protocol
and the legacy /dev/rfcomm model worked fine, because then it used the
sleeping functions in the POSIX serial code inside libdivecomputer.
This just adds trivial sleeping functions for the affected download
protocols. Maybe I should have just made libdivecomputer have a sane
default instead, but this wasn't hard either (the hard part was trying
to figure out why the downloads worked for some people and not for
others).
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This converts our old custom IO model to the new model that
libdivecomputer introduced. This is partly based on Jef's rough patch
to make things build, with further work by me.
The FTDI code is temporarily disabled here, because it will need to be
integrated with the new way of opening devices.
The ble_serial code goes away entirely, since now libdivecomputer knows
about BLE transport natively, and doesn't need to have any serial
wrapper around it.
Signed-off-by: Jef Driesen <jef@libdivecomputer.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
So because I merged with upstream libdivecomputer, and it no longer does
the "halfduplex emulation" thing in the IO layer, and instead does it in
the only Suunto backend that needed it, that also affected our custom IO
layer in subsurface.
Sure, I could have left a dummy interface and left subsurface with some
ugly dead code, but it's really better to just get rid of the code.
So when Dirk pulls in the libdivecomputer updates from
https://github.com/torvalds/libdc-for-dirk.git Subsurface-branch
this patch to remove the halfduplex code in subsurface is also needed.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Stefan Fuchs <sfuchs@gmx.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This gets us the first merge with the upstream iostream implementation.
This requires a small change for serial_ftdi.c to build.
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Setting break is required to wake up Cochran DCs (it doesn't make
sense to me, but it's needed).
Signed-off-by: John Van Ostrand <john@vanostrand.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
The USB reset flushes both buffers, but it also solves a problem
waking up a Cochran DCs.
Signed-off-by: John Van Ostrand <john@vanostrand.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Back off was exponential starting at 10ms, which for high baud
rate and no flow-control connections might cause buffer overrun.
This was causing problems when reading Cochran DCs, the hearbeat
byte was being missed.
Signed-off-by: John Van Ostrand <john@vanostrand.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
I hate changing the IO interfaces this often, but when I converted the
custom serial interface to the more generic custom IO interface, I
intentionally left the legacy serial operations alone, because I didn't
want to change something I didn't care about.
But it turns out that leaving them with the old calling convention
caused extra problems when converting the bluetooth serial code to have
the BLE GATT packet fall-back, which requires mixing two kinds of
operations.
Also, the packet_open() routine was passed a copy of the 'dc_context_t',
which makes it possible to update the 'dc_custom_io_t' field on the fly
at open time. That makes a lot of chaining operations much simpler,
since now you can chain the 'custom_io_t' at open time and then
libdivecomputer will automatically call the new routines instead of the
old ones.
That dc_context_t availability gets rid of all the
if (device && device->ops)
return device->ops->serial_xyz(..);
hackery inside the rfcomm routines - now we can just at open time do a simple
dc_context_set_custom_io(context, &ble_serial_ops);
to switch things over to the BLE version of the serial code instead.
Finally, SSRF_CUSTOM_IO v2 added an opaque "dc_user_device_t" pointer
argument to the custom_io descriptor, which gets filled in as the
custom_io is registered with the download context. Note that unlike
most opaque pointers, this one is opaque to *libdivecomputer*, and the
type is supposed to be supplied by the user.
We define the "dc_user_device_t" as our old "struct device_data_t",
making it "struct user_device_t" instead. That means that the IO
routines now get passed the device info showing what device they are
supposed to download for.
That, in turn, means that now our BLE GATT open code can take the device
type it opens for into account if it wants to. And it will want to,
since the rules for Shearwater are different from the rules for Suunto,
for example.
NOTE! Because of the interface change with libdivecomputer, this will
need a flag-day again where libdivecomputer and subsurface are updated
together. It may not be the last time, either.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Instead of being "custom serial", it's a IO model that allows serial or
packet modes, independently of each other (ie you can have a bluetooth
device that does serial over BT rfcomm and packet-based communication
over BLE GATT with the same serial operations that describe both cases).
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The set_halfduplex function takes a unsigned int, not a int.
Signed-off-by: Anton Lundin <glance@acc.umu.se>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This rewrites the custom serial code to use the new api which I
implemented in the Subsurface-branch of libdivecomputer.
This is a bit to big patch but I haven't had the time to break it down
into more sensible patches.
This rewrite enables us to support more ftdi based divecomputer
communication and is tested with both a OSTC3, OSTC2N and a Suunto
Vyper, all over the libftdi driver.
The bluetooth code paths are tested to, and should work as before.
Signed-off-by: Anton Lundin <glance@acc.umu.se>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Having subsurface-core as a directory name really messes with
autocomplete and is obviously redundant. Simmilarly, qt-mobile caused an
autocomplete conflict and also was inconsistent with the desktop-widget
name for the directory containing the "other" UI.
And while cleaning up the resulting change in the path name for include
files, I decided to clean up those even more to make them consistent
overall.
This could have been handled in more commits, but since this requires a
make clean before the build, it seemed more sensible to do it all in one.
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
2016-04-04 22:33:58 -07:00
Renamed from subsurface-core/serial_ftdi.c (Browse further)
