The automatic selections of the measured quantity and equivalent circuit
model are more part of the configuration of the meter than attributes
of the measurement result. To reflect this, model them as config keys
instead of mqflags. This allows a driver that supports remote control to
implement 'set' method for them and has the additional benefit of saveing
two flag bits.
If the number and specs of the device's channels are not static, i.e.
need to be probed, this facility is needed.
Initially this will be used for the Philips PM2800 series, where only
the model returned by *IDN? is needed. However this could also be used
to do actual discovery with vendor-specific SCPI commands.
At least the Rigol DP800 series trigger the beeper when changing
channels remotely. Which gets rather annoying when doing acquisition
on three channels as fast as you can.
Add a driver for the DER EE DE-5000 LCR meter. This meter is based on
the Cyrustek ES51919/ES51920 chipset and communicates with the host
computer via an optional connectivity kit.
The kit uses an optoisolated unidirectional link to connect to the
meter and an USB cable on the host side. Internally the connection is
using the FTDI FT232R USB UART chip i.e. from the host computer point
of view the meter is connected into an RS-232 serial port.
This driver implements just a thin shim layer for registering the
driver and uses the es51919 module for all the actual work.
Add a protocol decoder for the Cyrustek ES51919 LCR meter chip.
This chipset (together with ES51920 front-end) is supposedly used
by multiple different portable LCR meters including at least
DER EE DE-5000, Yihua V&A VA520, Mastech MS5308, Uni-T UT612,
CEM DT-9935 and various OEM rebadges of them.
The communication protocol seems to be implemented on the Cyrustek
chip itself so all the different models are expected to use the
same protocol if they implement a host connection. Unfortunately
the protocol is not available in the public documentation of the
chipset, so this implementation is based on reverse engineering it
from traffic captures.
The actual connection between the meter and the host computer may be
different from meter to meter even when based on the same chip. This
module implements a decoder for the protocol and some common helper
functions for interfacing with the meter via an RS-232 serial port.
This calculates a proper timeout value for blocking writes on the
given serial port, for the given number of bytes. Timeout is based
on a fixed 10ms OS overhead, baud rate, data bits and stop bits.
Set this new parameter to 0 (no timeout) at every call site. This is
consistent with previous behaviour, so cannot cause any regressions.
Waiting forever for a serial operation is clearly always wrong. Without
specific knowledge of each device and driver however, I can't choose
appropriate timeouts for each call. The maintainers of these drivers
will need to do so, and also add appropriate handling of timeouts.
When this commit is merged, a bug should be entered for each driver
that is touched by it.
This cleans up some warnings generated by clang's static analyzer.
The function now also returns SR_ERR to signify the specified filename
does not point to a valid session file.
Other SR_ERR_* returns indicate a session file was found, but loading
failed.
This signifies to the module instance no more input will come. This
will cause the module to process any data it may have buffered. The
SR_DF_END packet will also typically be sent at this time.
When an input module instance has received enough input to fully
populate the struct sr_dev_inst, sdi_ready is set to TRUE and its
receive() method returns immediately. Any remaining received data
is buffered until the next time the function is called.
Previously, sdi->index was used to tell several identical fx2lafw-compatible
devices apart. This was a bit of a hack, so this patch makes it use physical
device connections instead. They're guaranteed to remain the same even if
the USB device reconnects.
These calls are executed from an event handler and were previously nonblocking,
but they have no partial read/write handling. The code is already marked TODO
for improvement.
This call is executed from an event handler and was previously nonblocking,
but has no partial write handling. It sends a short packet so should be OK
to block, most likely the output buffer will be empty anyway.
This call was already nonblocking since the driver opens the port with the
SERIAL_NONBLOCK flag. It only reads one byte, and a zero result is handled
appropriately.
This call was previously explicitly nonblocking, but has no partial write
handling. It sends a short packet so should be OK to block, most likely the
output buffer will be empty anyway.
This call was already nonblocking since the driver opens the port with the
SERIAL_NONBLOCK flag. It only reads one byte, and a zero result is handled
appropriately.
This call is executed from an event handler and was previously nonblocking,
but has no partial write handling. It sends a short packet so should be OK
to block, most likely the output buffer will be empty anyway.
These calls are executed from an event handler and were previously nonblocking,
but have no partial write handling. They send short packets so should be OK to
block, most likely the output buffer will be empty anyway.
Fix error handling for some: serial_write can return any negative error code.
This call was previously nonblocking, but there is no handling of partial
writes. It is called from config_set where it is free to block.
Also fix error handling: serial_write can return any negative error code,
not just -1.
These calls were already nonblocking since the driver opens the port with the
SERIAL_NONBLOCK flag. They only read one byte. A return value of zero is not
handled, but should not occur in theory due to the G_IO_IN check. It might be
good to add handling of a zero return anyway, since I'm not sure if this is
always accurate.
This call was already nonblocking since the driver opens the port with the
SERIAL_NONBLOCK flag. It only reads one byte, and a zero result is handled
appropriately.
These calls are executed from an event handler and were previously nonblocking,
but have no partial write handling. They send short packets so should be OK to
block, most likely the output buffer will be empty anyway.
Also fix error handling for these calls, which seems to have been retained from
previous direct usage of write() to a serial port fd.
These calls were previously nonblocking, but have no partial write handling.
They are made from scan and acquisition_start contexts where they are free
to block.
Remove the SERIAL_NONBLOCK at open, which only applied during scan, since all
calls in the scan are now explicitly blocking.
Also fix error handling for these calls, which appears to have been kept
from a previous direct usage of write() on a serial port fd.
This call was already nonblocking since the driver opens the port with the
SERIAL_NONBLOCK flag. Only one byte is read. The case of 0 being returned
is not handled, but the call is only made if G_IO_IN occurred so in theory,
there should be a byte available. It might be wise to add handling for a
return of 0 nonetheless, as I'm not sure if this is always accurate.
This is an odd one. These calls are made from a receive handler so should not
block, and appear to be setup correctly to handle partial reads or no data
available. However, the driver was not opening the port with SERIAL_NONBLOCK
so these calls would have been blocking. Make them nonblocking.
This call is executed from an event handler and was previously nonblocking,
but has no partial write handling. It sends a short packet so should be OK
to block, most likely the output buffer will be empty anyway.
These calls were already nonblocking since this driver opened the port with
the SERIAL_NONBLOCK flag. Having marked them as such, we can remove the flag.
Also remove an unnecessary reopen of the port to change its blocking status.
This call is executed from an event handler and was previously nonblocking,
but has no partial write handling. It sends a short packet so should be OK
to block, most likely the output buffer will be empty anyway.
This call is executed from an event handler and was previously nonblocking,
but has no partial write handling. It sends a short packet so should be OK
to block, most likely the output buffer will be empty anyway.
This is called at scan time so free to block. There is no partial write
handling and a response is expected afterwards. This should therefore be a
blocking call.
This call is executed from an event handler context was previously
nonblocking, however there is no handling for a partial write.
The output buffer is unlikely to be full and the commands to be sent
are short, so it should be OK to make this a blocking call.
This call is executed at scan time so is free to block. There is no
handling for a partial write and a response is expected immediately
afterwards. It should therefore be a blocking call.
This code implements its own waiting based on baudrate, so the read itself
should be nonblocking. In general it will have been already, since drivers
almost universally use the SERIAL_NONBLOCK flag.
Uffe Jakobsen
Bert Vermeulen
Uwe Hermann
Soeren Apel
Janne Huttunen
Jens Steinhauser
Martin Ling
Aurelien Jacobs