proper setup of pull up/down for ulp

insighio · Feb 29, 2024 · 4d65ff3 · 4d65ff3
1 parent 33b18e0
commit 4d65ff3
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/ports/esp32/esp32_ulp.c b/ports/esp32/esp32_ulp.c
@@ -119,7 +119,9 @@ STATIC mp_obj_t esp32_ulp_init_gpio(mp_obj_t self_in, mp_obj_t gpio_num_in)
 
     rtc_gpio_init(gpio_num);
     rtc_gpio_set_direction(gpio_num, RTC_GPIO_MODE_INPUT_ONLY);
-    rtc_gpio_pulldown_en(gpio_num);
+
+    // no pull up/down is needed if shield is present with clear signal
+    rtc_gpio_pulldown_dis(gpio_num);
     rtc_gpio_pullup_dis(gpio_num);
     rtc_gpio_hold_en(gpio_num);