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extmod/machine_timer: Support hard IRQ soft timer callbacks.

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machine.Timer() has inconsistent behaviour between ports: some run
callbacks in hard IRQ context whereas others schedule them like soft IRQs.

As on the rp2 port, add support to the generic software timer for a hard=
argument to explicitly choose between these, setting the default to False
to match the existing behaviour. This enables hard timer callbacks for
the alif, mimxrt and samd ports.

Signed-off-by: Chris Webb <chris@arachsys.com>
This commit is contained in:
Chris Webb
2025-08-25 14:02:32 +01:00
committed by Damien George
parent ad11df7f7a
commit 955b6a907c
1 changed files with 8 additions and 1 deletions
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9
extmod/machine_timer.c
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@@ -42,13 +42,14 @@ static void machine_timer_print(const mp_print_t *print, mp_obj_t self_in, mp_pr
}
static mp_obj_t machine_timer_init_helper(machine_timer_obj_t *self, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum { ARG_mode, ARG_callback, ARG_period, ARG_tick_hz, ARG_freq, };
enum { ARG_mode, ARG_callback, ARG_period, ARG_tick_hz, ARG_freq, ARG_hard, };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_mode, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = SOFT_TIMER_MODE_PERIODIC} },
{ MP_QSTR_callback, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ MP_QSTR_period, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0xffffffff} },
{ MP_QSTR_tick_hz, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1000} },
{ MP_QSTR_freq, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_rom_obj = MP_ROM_NONE} },
{ MP_QSTR_hard, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
};
// Parse args
@@ -81,6 +82,12 @@ static mp_obj_t machine_timer_init_helper(machine_timer_obj_t *self, size_t n_ar
self->py_callback = args[ARG_callback].u_obj;
}
if (args[ARG_hard].u_bool) {
self->flags |= SOFT_TIMER_FLAG_HARD_CALLBACK;
} else {
self->flags &= ~SOFT_TIMER_FLAG_HARD_CALLBACK;
}
if (self->py_callback != mp_const_none) {
soft_timer_insert(self, self->delta_ms);
}