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-rw-r--r--esp8266/modmachine.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/esp8266/modmachine.c b/esp8266/modmachine.c
index 4a73883b4b..afb7ba5d4d 100644
--- a/esp8266/modmachine.c
+++ b/esp8266/modmachine.c
@@ -75,6 +75,8 @@ STATIC mp_obj_t esp_timer_init_helper(esp_timer_obj_t *self, mp_uint_t n_args, c
mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
self->callback = args[2].u_obj;
+ // Be sure to disarm timer before making any changes
+ os_timer_disarm(&self->timer);
os_timer_setfn(&self->timer, esp_timer_cb, self);
os_timer_arm(&self->timer, args[0].u_int, args[1].u_int);