From dff293840e381444bcd843a325ab3dd7da685733 Mon Sep 17 00:00:00 2001 From: Damien George Date: Wed, 8 Nov 2023 23:34:08 +1100 Subject: [PATCH] extmod/machine_i2c: Do a fast poll during I2C.scan(). Fixes issue #12912. Signed-off-by: Damien George --- extmod/machine_i2c.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/extmod/machine_i2c.c b/extmod/machine_i2c.c index 44e6921309..6cc2aa5bbf 100644 --- a/extmod/machine_i2c.c +++ b/extmod/machine_i2c.c @@ -328,7 +328,12 @@ STATIC mp_obj_t machine_i2c_scan(mp_obj_t self_in) { if (ret == 0) { mp_obj_list_append(list, MP_OBJ_NEW_SMALL_INT(addr)); } - #ifdef MICROPY_EVENT_POLL_HOOK + // This scan loop may run for some time, so process any pending events/exceptions, + // or allow the port to run any necessary background tasks. But do it as fast as + // possible, in particular we are not waiting on any events. + #if defined(MICROPY_EVENT_POLL_HOOK_FAST) + MICROPY_EVENT_POLL_HOOK_FAST; + #elif defined(MICROPY_EVENT_POLL_HOOK) MICROPY_EVENT_POLL_HOOK #endif }