The irq handling in sam3x8e isn't specific to the sam3x8e proccessor -
it's generic for all armcm type machines. So, move the definitions
into a new file generic/armcm-irq.c
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
It's possible for sched_del_timer() to be called on a timer that fires
just after sched_del_timer disables irqs but before the next timer is
scheduled. In this case be sure to clear the irq pending status flag
after scheduling the next timer so that a delayed irq doesn't cause
the wrong timer to be run. For the same reason, make sure to check
the irq pending status flag at the start of the timer irq.
Also, as a safety check, make sure timer_set_next() isn't called from
within the timer irq dispatch loop.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
There is a small possibility that a shutdown could occur between
clearing transmit_max and clearing transmit_pos - so make sure to
handle the case where transmit_pos > transmit_max.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
As long as the code is careful when writing the in_sendf variable it
should be safe to update it without having to disable irqs.
Also, make sure in_sendf is cleared on shutdown.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Allow sendf() to be called from irq and timer context - check for the
case where sendf() is called while already in sendf() and simply
discard those messages. This makes it safe to use output() debugging
calls even in irq and timer context.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Use a base of 256 instead of 65536 when calculating the sum of the
square of the clock differences in the stats. This makes the
calculation more accurate. Export the new base via DECL_CONSTANT for
the host to access. Use DIV_ROUND_UP() when adjusting for the base to
ensure no lost ticks. Do the division after multiplication in the
common case where the time between stats_task() invocations is less
than 64K ticks.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Don't assume the hardware ADC has 10bit resultion - instead have the
firmware define a constant and read that constant in the host.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Add a DECL_CONSTANT macro to allow the firmware to define constants
that are to be exported to the host during the "identify" phase. This
replaces the existing hardcoded mechanism of scanning the Kconfig
header file for certain constants.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Automatically reset the next step time to zero on a stepper_stop()
call. This makes the host code simpler as it no longer needs to
schedule an explicit reset_step_clock command on the step after a
homing operation.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Invert the default meaning of the stepper direction pin. Instead of
treating a low value as position motion, treat a high value as
positive motion. This matches what other firmwares do, and it matches
what common stepper motor drivers document.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Return the number of clock ticks to wait directly from
gpio_adc_sample(). This simplifies the ADC interface.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Rework the timer prioritization code so that is compares against the
current time instead of the number of repeat timers in a given
interrupt. This makes the code slightly faster and it should provide
better protection against task starvation.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Tweak the AVR register pressure optimization in reschedule_timer() to
optimize it further. This improves the performance of AVR timers when
there are several pending timers.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Rework the timer prioritization code so that is compares against the
current time instead of the number of repeat timers in a given
interrupt. This makes the code slightly faster and it should provide
better protection against task starvation.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Increase the size of the serial receive buffer. With transmit rates
of 250000 baud, it only takes a little over a millisecond to overflow
the existing buffer.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
It's possible for a "count=1" stepper move immediately after a
set_next_step_dir or reset_step_clock command to be valid and have an
interval less than min_stop_interval. Make sure this case does not
result in a shutdown.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Commit da305e6b changed the objcopy command to use the --dump-section
flag. However, the 2.24 version of avr-objcopy (which is common on
raspbian installs) does not support this flag. Avoid using
--dump-section and continue to use the -j option instead.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This adds basic support for running on the Atmel SAM3x8e
micro-controllers that are found in the Arudino Due boards.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
On faster MCUs the step and unstep events may be too close for the
stepper motor driver. Add a CONFIG_NO_UNSTEP_DELAY build option and
support the case where it is not set. This allows faster MCUs to
schedule two events for each step (one for the step and one for the
unstep).
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Introduce enable_tx_irq() for manipulating the AVR hardware. This
keeps the low-level hardware code together.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Default to O2 and set Os in the AVR makefile. Platforms besides AVR
are likely to produce better code with O2 so make that the default.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Some architectures are faster passing regular integers than 8bit
integers. Use uint_fast8_t so that the architecture chooses the
appropriate type.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
The AVR wants a uint8_t return type for irq_save(), but other
architectures will generally prefer int. Allow the board to configure
the size of the flag by introducing an irqstatus_t typedef.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Task and command handlers always run with irqs enabled, so it is not
necessary to save/restore the irq state when disabling irqs in these
handlers.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Some boards may not support hardware based PWM. Update the build so
that those commands do not need to be compiled if they are not
available.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Some boards may not support SPI transfers. Update the build so that
those commands do not need to be compiled if they are not available.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Some boards may not support the ADC hardware. Update the build so
that those commands do not need to be compiled if they are not
available.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Move the definitions of the readb() style functions to a new header
generic/io.h. This eliminates the dependency of stdint.h on
compiler.h.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Instead of creating a misc.h file in each board directory, create a
generic board directory and declare misc.h there.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Some AVR chips ship with a 1/8th clock divisor set. Add a compile
time option to manually clear this field at startup.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
The gpio_adc_info only contains a single uint8_t field - it's simpler
to use an array of uint8_t instead.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Kevin O'Connor