Change the simulator to use the generic timer_irq.c and serial_irq.c
code for (dummy) timer and io handling. This is just to make the code
a better example for other developers (most micro-controllers will use
the timer_irq.c and serial_irq.c code).
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>
Export a new console_sendf() function from the board code instead of
console_get_output() and console_push_output(). This enables more
flexibility in how the board specific code produces output.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Move the command_task() code from the generic code to the board
specific code. This enables more flexibility in how the board
specific code processes input.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Avoid using linker magic to define the init, task, and shutdown
functions. Instead, use the compile_time_request system. This
simplifies the build and produces more efficient code.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Rename sched_timer_kick() to sched_timer_dispatch() and move its loop
into its callers in the board code. This eliminates the need to
export timer_try_set_next() from the board code.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Explicilty load the timer waketime variable into local variables in
sched_timer_kick(). Change the optimization level from Os to O2.
This helps gcc to avoid unnecessary reloads from memory in the common
stepper_event() case.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Move sched_is_before() from sched.c to timer_is_before() in the board
specific timer code. This allows the board code to provide its own
definition.
Also, remove the sched_from_us() and sched_read_time() wrapper
functions and change the callers to directly invoke timer_from_us() /
timer_read_time().
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
It's tricky to reschedule the timer irq correctly (due to race
conditions with the irq) and in practice it's very rarely needed.
Handle the special cases in the generic sched.c code so that the board
code doesn't have to handle it.
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>
Kevin O'Connor