The RaspberryPi processor implements 'double to int32' conversions
much faster than 'double to int64' conversions. Rework the code so
that steps stored in the queue are always a small offset from the last
sent step time. (In the unlikely event that a step is far from the
last step time, then the queue is flushed to maintain this invariant.)
This simplifies the step compression code as well - it no longer needs
to check for integer overflows.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Create an insertion "cursor" for adding items to the step compression
queue. This makes the calling code simpler and it makes it easier to
update the queue memory management in the future.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
The homing operation can be cpu intensive for the host software. Add
a small (250ms) delay before homing so that the host has additional
time to process the command before it is due on the mcu. This is
intended to work around some reports of "timer too close" errors
during Z homing on RPi2 hosts and printers with high precision Z
positioning.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Adjust the configured homing speed so that it always results in a
speed that is an even number of mcu ticks per step. This ensures that
the code can always get good step compression during homing, which is
important as the entire homing operation must be able to fit within
the mcu's move queue. This fixes some "move queue empty" mcu shutdown
errors that could occur when the Z step distance was an unusual size.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Allow external code to obtain the mcu object that controls a pin setup
with setup_pin(). Also, don't bother defining print_to_mcu_time() and
system_to_mcu_time() on each pin object as they can be obtained via
the new get_mcu() method.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Commit 9d75c3b0 changed the order of allocation for mcu oid integer
ids. However, the stepper oids must always be allocated before
endstop oids so that corexy can register multiple steppers on a single
endstop.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Preface the internal functions to make it more clear which functions
are interfaces to external code.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
It's no longer necessary to use the TICKS() hack as the config
commands are now all generated after the mcu speed is known.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
It should no longer be necessary to configure "custom" commands during
mcu setup. The ad5206 and static_digital_output config sections
should provide similar functionality.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Support an "ad5206" config section so that one can configure the
digipots found on Reprap "RAMBo" boards.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Allow digital and PWM output pins to be setup via new config
sections. This makes it easier to setup pin configurations.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
The MCU() class needs to track the stepqueues so that it can
initialize the steppersync object. Track the stepqueues directly
instead of via the list of steppers.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Track the oid count separately from the configurable object count -
this way it is possible to have internal objects that don't require an
oid in the mcu.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
It's not necessary to register and execute "init callbacks" when
configuring the mcu. Instead, have each mcu object produce its init
messages in the build_config() callback.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Allow multiple chips to provide pin mappings (not just the main mcu
chip). Move the pin parsing from the mcu.py code to pins.py and
support mapping from pin descriptions to their corresponding chips and
parameters.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Store pertinent information from the software startup in a dictionary
that the various printer components can access instead of in
individual variables in the Printer() class. This makes it easier to
add future command-line options.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Store the underlying temperature and resistance values instead of the
Steinhart-Hart coefficents obtained from them. This makes it easier
to add new thermistors.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Compile the PRU binary with -Os optimization, but request that the
timer dispatch code be compiled with -O2 optimization. This improves
the performance of timers slightly.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
The gcc -Os option significantly reduces the size of the PRU binary
and it has little impact on performance.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
The command_encodef() can read the max_size parameter directly from
the 'struct command_encoder' passed into it. Also, there is no need
to check that a message will fit in a buffer if the buffer is declared
to be MESSAGE_MAX in size.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Go back to scheduling the unstep time instead of busy waiting in the
timer dispatch. With the unstep time increased to 2us, it no longer
makes sense to spin while waiting for the unstep.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Allow timer_dispatch_many() to run for extended periods if there are
no tasks pending. This reduces the amount of lost cpu time spent
entering and exiting the irq handler.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Now that tasks are only run when needed it's common for there to be a
larger variation in task execution time. When graphing load, consider
a 99-percentile task duration of 2.5ms to be 100% loaded (up from
1ms).
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Send a "startup" message after completing the mcu init functions.
This may help detect mcu reboots during debugging.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Allow the timer dispatch irq handler to run for extended periods if
there are no tasks pending. This reduces the amount of lost cpu time
spent entering and exiting the irq handler.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Track when tasks are pending and spin in irq_wait() when no tasks are
pending. This improves the mechanism for sleeping the processor -
it's simpler for the board specific code and it reduces the
possibility of the processor sleeping when tasks are busy.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Add function to indicate when tasks need to be run. This will allow
the scheduler code to know if there are any tasks that need to be
processed.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Don't rely on the generic scheduler code to always have a timer no
more than 1ms in the future. Instead, create an avr specific timer
that will be called every 0x8000 ticks. This simplifies the generic
code and it reduces the amount of code that needs to be run every
millisecond.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
If sched_add_timer() is called on a timer that would make it the new
head of the list, then add it and signal the board code that the timer
should be rescheduled.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
It's not necessary to keep a millisecond counter. Replace the two
users of sched_check_periodic() with explicit task wakeup flags.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
The simulavr simulator will warn when writing to the watchdog
registers, but running code closer to what real hardware runs is worth
a few extra warnings.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Kevin O'Connor