From 466fa6f5a9390c4250baceecb50c7c471d8a4c2a Mon Sep 17 00:00:00 2001
From: Me No Dev <me-no-dev@vdnsbg.com>
Date: Sun, 29 Nov 2015 18:15:07 +0200
Subject: [PATCH] Get pin levels at time of interrupt, rather than the time of
 calling the handler

current implementation can cause false readings if previous handlers
take more time than the pin holds the level
---
 cores/esp8266/core_esp8266_wiring_digital.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/cores/esp8266/core_esp8266_wiring_digital.c b/cores/esp8266/core_esp8266_wiring_digital.c
index c64961f03..1581bce8f 100644
--- a/cores/esp8266/core_esp8266_wiring_digital.c
+++ b/cores/esp8266/core_esp8266_wiring_digital.c
@@ -111,6 +111,7 @@ static uint32_t interrupt_reg = 0;
 
 void interrupt_handler(void *arg) {
   uint32_t status = GPIE;
+  uint32_t levels = GPI;
   GPIEC = status;//clear them interrupts
   if(status == 0 || interrupt_reg == 0) return;
   ETS_GPIO_INTR_DISABLE();
@@ -122,7 +123,7 @@ void interrupt_handler(void *arg) {
     interrupt_handler_t *handler = &interrupt_handlers[i];
     if (handler->fn && 
         (handler->mode == CHANGE || 
-         (handler->mode & 1) == digitalRead(i))) {
+         (handler->mode & 1) == !!(levels & (1 << i)))) {
       // to make ISR compatible to Arduino AVR model where interrupts are disabled
       // we disable them before we call the client ISR
       uint32_t savedPS = xt_rsil(15); // stop other interrupts