Merge pull request #1496 from particle-iot/fix/wkp-pin-after-deep-sleep

[Photon/Electron] WKP pin needs to be disabled as a wakeup source on boot to allow its normal operation

hal/src/stm32f2xx/core_hal_stm32f2xx.c

@@ -333,6 +333,8 @@ void HAL_Core_Config(void)
 
     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_BKPSRAM, ENABLE);
 
+    /* Disable WKP pin */
+    PWR_WakeUpPinCmd(DISABLE);
 
     //Wiring pins default to inputs
 #if !defined(USE_SWD_JTAG) && !defined(USE_SWD)

user/tests/wiring/sleep/sleep.cpp

@@ -20,6 +20,22 @@ test(sleep_0_device_wakes_from_deep_sleep_with_short_sleep_time)
         magick = 0;
         // We should have woken up from deep sleep
         assertEqual(System.resetReason(), (int)RESET_REASON_POWER_MANAGEMENT);
+
+        /**
+         * Issue #1447 "WKP/A7 ignores pinMode after waking from deep sleep"
+         * A7/WKP pin must be jumpered to D7 because
+         * digitalWrite(A7) will be equal to digitalRead(A7) despite this issue.
+         */
+        Serial.println("SETUP: Make sure to jumper A7/WKP pin to D7 pin.");
+        pinMode(A7, OUTPUT);
+        pinMode(D7, INPUT);
+        digitalWrite(A7, HIGH);
+        delay(1);
+        assertEqual((int)digitalRead(D7), (int)HIGH);
+        digitalWrite(A7, LOW);
+        delay(1);
+        assertEqual((int)digitalRead(D7), (int)LOW);
+        // Issue #1447
     } else {
         Serial.println("Publishing 10 messages, see them at 'particle subscribe mine'");
         // Set magic key in retained memory to indicate that we just went into deep sleep