Commit Graph

15 Commits

Author SHA1 Message Date
Damien George 8ed7155828 stmhal: Add "quiet timing" enter/exit functions.
They disable all interrupts except for SysTick and are useful for doing
certain low-level timing operations.
2017-06-22 16:18:42 +10:00
Damien George 080210ddc6 stmhal/irq: Shift IRQ priorities of TIM and EXTINT to be above PENDSV.
This way, Timer and ExtInt callbacks can interrupt the low-priority
pendsv handler (for example thread switching).
2017-03-22 12:39:32 +11:00
Damien George 4ebdb1f2b2 py: Be more specific with MP_DECLARE_CONST_FUN_OBJ macros.
In order to have more fine-grained control over how builtin functions are
constructed, the MP_DECLARE_CONST_FUN_OBJ macros are made more specific,
with suffix of _0, _1, _2, _3, _VAR, _VAR_BETEEN or _KW.  These names now
match the MP_DEFINE_CONST_FUN_OBJ macros.
2016-10-21 16:26:01 +11:00
Damien George d2d9dfcd40 stmhal: Remove obsolete code for special handling of TIM3 irq settings.
TIM3 is no longer special, or at least does not have special IRQ settings.
2016-08-22 12:24:49 +10:00
Damien George 401af50dc0 stmhal: Add pyb.irq_stats() to get statistics about IRQ calls.
Adds a lot of code, makes IRQs a bit less efficient, but is very useful
for debugging.  Usage: pyb.irq_stats() returns a memory view that can be
read and written, eg:

    list(pyb.irq_stats())
    pyb.irq_stats()[0]
    pyb.irq_stats()[0] = 0

The patch provides general IRQ_ENTER() and IRQ_EXIT() macros that can be
modified to provide further IRQ statistics if desired.
2015-12-22 21:00:20 +00:00
Damien George dd7d2e0810 stmhal: Only use BASEPRI irq stuff if Cortex is M3 or higher. 2015-12-04 12:13:12 +00:00
Damien George 95c9cc8114 stmhal: Add raise_irq_pri and restore_irq_pri functions.
These can be used to disable only certain interrupts, ones at or above
the given priority value.
2015-12-04 11:38:23 +00:00
Dave Hylands c8437f97ae stmhal: Increase the priority of UART IRQ.
The UARTs have no FIFOs, so if interrupts are disabled
for more than a character time (10 usec at 1 Mbit/sec)
then characters get dropped.

The overhead for handling a UART ISR is about 0.5 usec,
so even at baud rates of 1 Mbit/sec this only corresponds
to about 5% of the CPU. Lower baud rates will have less
of an impact.
2015-11-25 08:03:44 +00:00
Damien George 3cfb02f166 stmhal/irq: Set all IRQ subpriorities to 0, since they aren't used. 2015-11-24 15:56:33 +00:00
Damien George 18820471ae stmhal/irq: Add comment about SDIO priority being higher than DMA. 2015-11-24 15:51:07 +00:00
Dave Hylands 9f5486c7e2 stmhal: Put IRQs into priority order.
- added some comments to explain the priority/sub-priority.
- adds an entry for SDIO (to be used in a later patch)
- increases DMA priority above USB so that DMA can be used
  for sdcard I/O when using USB Mass Storage.
2015-11-24 09:37:25 +00:00
Dave Curtis 32b3549cce stmhal: Add symbolic #defines for interrupt levels in irq.h. 2015-11-01 23:23:39 +00:00
Damien George 1960475ed7 stmhal: Make pyb.[u]delay use systick with IRQs, busy loop otherwise.
pyb.delay and pyb.udelay now use systick if IRQs are enabled, otherwise
they use a busy loop.  Thus they work correctly when IRQs are disabled.
The busy loop is computed from the current CPU frequency, so works no
matter the CPU frequency.
2014-11-30 21:23:25 +00:00
Damien George e5cbb70328 stmhal: Make enable_irq and disable_irq inline functions.
These functions are generally 1 machine instruction, and are used in
critical code, so makes sense to have them inline.

Also leave these functions uninverted (ie 0 means enable, 1 means
disable) and provide macro constants if you really need to distinguish
the states.  This makes for smaller code as well (combined with
inlining).

Applied to teensy port as well.
2014-08-25 13:24:33 +01:00
Dave Hylands 9480138f0c Add save/restore_irq
Factored irq functions into a separate file.
2014-08-25 12:22:11 +01:00