Not all drivers use subdrivers. The only reason the subdriver field was
introduced was to accomodate the model of serial-dmm.
The sr_dev_driver struct is available to the frontend. Exposing the subdriver
field creates the problem of exposing knowledge of libsigrok's internal driver
layout, even though the drivers are designed to be a flat list to the frontend.
Store the subdriver in the dev_context struct of serial-dmm.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
The global *di alias was used to keep track of the driver context.
It caused issues with trying to use several subdrivers at once, so
its use was obsoleted.
The correct context is preserved through different mechanisms, either
the *sdi pointer, or wrappers which pass the correct context.
The *di alias is no longer used, so remove it.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Wrappers for hw_init, hw_cleanup, clear_instances, and hw_scan are needed for
each subdriver due to the nature of serial-dmm. These wrappers are implemented
as macros, in order to reduce the number of lines of code.
For each of those functions, we have a separate wrapper list, then we connect
them together in a first-class driver using a DRV macro, and yet another list
(the DRV list).
Instead of declaring those wrappers in separate lists, include them in the DRV
macro. This approach reduces the number of macro lists from five to just one.
From the perspective of adding a new subdriver, this also greatly reduces the
number of places needed to hook in a new device.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Store/use the receive_data() function and a pointer to the driver struct
in the dmms[] array. Use a ".subdriver" entry in the driver struct.
Use a macro to simplify hw_init() wrappers.
Declare dmm_info dmms as extern in protocol.h to prevent duplicate
symbol error from the linker.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
di was initialized as NULL. If no device covered by this driver
is used, di remains NULL. This causes a segmentation fault when
calling clear_instances().
Check for di being NULL.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Use the infrastructure of serial-dmm to handle the RadioShack 22-812,
and completely remove radioshack-dmm.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Move the parsing part of radioshack-dmm into a separate protocol
parser, following the model from hardware/common/dmm.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
During scan the serial port is opened with SERIAL_RDONLY | SERIAL_NONBLOCK,
which works fine, but when acquisition starts, it is opened only with
SERIAL_RDONLY. On Linux, if cdc_acm can make a claim to the USB to serial
converter, opening the port will fail.
Open port with SERIAL_RDONLY | SERIAL_NONBLOCK.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
We already have an event-based mechanism in place. Using a thread just
adds unneeded complexity, especially for a driver designed not for
performance, but for providing a testbed to frontends.
Generate the data in the event handler, not in a separate thread.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
strcmp(buf + 9, " mA") does not work because buf is CR-terminated,
while " mA" is NUL-terminated.
Drop ambiguities arising from the termination of the strings, and
only compare the characters we care about, using strncmp().
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
When the parser found a space, it treated it as an invalid digit
and discarded the whole packet. This behavior was incorrect on
2000 count devices, where the first digit can be sent as a space
rather than a '0'.
Convert spaces to '0' and parse them as usual.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Prepare the tekpower-dmm driver to be able to support various simple
serial port based DMMs.
Also, make a 'tekpower-tp4000zc' "first-class" driver which is currently
the only user of this generic driver.
The demo driver was using sr_session_source_add_channel() to add
a poll source, but was relying on sr_session_run_poll() to call
sr_session_source_remove(). This, coupled with the design of the
driver caused errors once the samples were collected.
The error stream was most likely related to failing to properly close
one of the channels.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
This is the first step in fixing the demo driver: figuring out what is
being called and what is not _and_ have it show up in the logs.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Options in addition to the usual "9600/8n1" syntax start with a
slash, and take the form of key=value, where different options are
also separated by slashes. For example:
"9600/8n1/rts=0/dtr=1"
This sets RTS low and DTR high.
The packet mode byte is akin to a signature. If that is invalid, there's
no point in calculating the checksum, so check the mode first.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Serial detection was using serial_readline, which stripped carriage
return from the packets. This made for a very unreliable detection
mechanism.
Switch to a timeout-based detection mechanism that parses the data
as it comes in. This also allows us to stop parsing once we found
our first valid packet.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
ols driver used to probe a series of available serial ports obtained
by regexp matching of common serial port names.
There are a number of problems with this approach:
1. It will probe all serial devices, including devices that do not
like to be probed, potentially causing them to act up.
2. It will try to probe serial ports which may already be opened in
other applications for other purposes.
3. It assumes the naming of the serial ports is set in stone, and
creates an unnecessary OS-specific list.
4. It produces unnecessary debug output even when an OLS device is
not connected.
5. etc...
Do not implicitly probe serial ports. Only probe the port specified
by the frontend, if any; otherwise, just quit.
Also get rid of all functionality in serial.c which was designed
specifically for random probing.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Alexandru Gagniuc
Uwe Hermann
Joel Holdsworth
Peter Stuge
Bert Vermeulen