The mcp251x uses half of the external OSC rate as CAN clock. In real world
applications external OSC with a clock of 16MHz or 20MHz are used. Adjust the
example ref clocks accordingly.
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
It makes no sense to print the mscan bit timing register values using the
sja1000 printf function.
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
although it looks like a false positive:
/home/travis/build/linux-can/can-utils/can-calc-bit-timing.c: In function ‘print_bit_timing.isra.6’:
/home/travis/build/linux-can/can-utils/can-calc-bit-timing.c:447:42: warning: ‘tseg2’ may be used uninitialized in this function [-Wmaybe-uninitialized]
unsigned int brp, tsegall, tseg, tseg1, tseg2;
^
/home/travis/build/linux-can/can-utils/can-calc-bit-timing.c:447:35: warning: ‘tseg1’ may be used uninitialized in this function [-Wmaybe-uninitialized]
unsigned int brp, tsegall, tseg, tseg1, tseg2;
^
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
The basename() function needs libgen.h to be included as otherwise this
will fail to compile in some environments.
Reported-by: Robert Schwebel <r.schwebel@pengutronix.de>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
This way all licenses in the project will be homogenised.
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Acked-by: Sven Schmitt <sven.schmitt@gmx.net>
Acked-by: Oleksij Rempel <ore@pengutronix.de>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Brennan Ashton <bashton@brennanashton.com>
Acked-By: IOhannes m zmölnig <zmoelnig@iem.at>
Acked-by: Frank Theile <ftheile@grundfos.com>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Acked-by: Jeremiah Mahler <jmmahler@gmail.com>
Acked-by: Jonathan Challinger <mr.challinger@gmail.com>
Acked-by: Cheng-Lung Lee <chenglung@gmail.com>
Acked-by: Ramesh Shanmugasundaram <rashanmu@gmail.com>
Acked-by: Mans Rullgard <mans@mansr.com>
Acked-by: Søren Holm <sgh@sgh.dk>
Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
This patch tries to optimize the calculation of the sample point. To
understand what it does have a look at the original implementation.
If there is a combination of timing parameters where both the bitrate
and sample point error are 0 the current implementation will find it.
However if the reference clock doesn't allow an optimal bitrate (this
means the bitrate error is always != 0) there might be several timing
parameter combinations having the same bitrate error. The original
implementation will allways choose the one with the highest brp. The
actual sample point error isn't taken into account.
This patch changes the algorithm to minimize the sample point error,
too. Now a brp/tseg combination is accepted as better if one of these
condition are fulfilled:
1) the bit rate error must be smaller, or
2) the bit rate error must be equal and
the sample point error must be equal or smaller
If a smaller bit rate error is found the sample point error is reset.
This ensures that we first optimize for small bit rate error and then
for small sample point errors.
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This patch adds the missing -1 to "bt->brp", as correctly used in the kernel
driver.
Signed-off-by: Brennan Ashton <bashton@brennanashton.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
When testing or improving the bit timing algorithm, you're probably
interested in the values of all can controllers. Further you might not
know the all reference clocks of the controllers.
This patch add a "ref_clock" member to the "struct can_bittiming_const"
that holds the reference clock of the controller in Hz.
By default now the bit timing is calculated for all known can
controllers with the default ref_clock defined in "can_bittiming_const".
It's still possible to overwrite the ref clock with the command line
option "-c".
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Marc Kleine-Budde
Kurt Van Dijck
Kristian Sloth Lauszus
Rosen Penev
Oliver Hartkopp
Alexander GQ Gerasiov
Alexander Gerasiov
Yegor Yefremov
Ramesh Shanmugasundaram
Wolfgang Grandegger
Brennan Ashton
Uwe Kleine-König