Update CI action versions

Fix infinite loop on STM32F103

.github/workflows/githubci.yml

@@ -7,11 +7,11 @@ jobs:
     runs-on: ubuntu-latest
     
     steps:
-    - uses: actions/setup-python@v1
+    - uses: actions/setup-python@v4
       with:
         python-version: '3.x'
-    - uses: actions/checkout@v2
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
+    - uses: actions/checkout@v3
       with:
          repository: adafruit/ci-arduino
          path: ci

DHT.cpp

@@ -26,7 +26,9 @@
 #include "DHT.h"
 
 #define MIN_INTERVAL 2000 /**< min interval value */
-#define TIMEOUT -1        /**< timeout on */
+#define TIMEOUT                                                                \
+  UINT32_MAX /**< Used programmatically for timeout.                           \
+                   Not a timeout duration. Type: uint32_t. */
 
 /*!
  *  @brief  Instantiates a new DHT class
@@ -38,6 +40,7 @@
  *          number of sensors
  */
 DHT::DHT(uint8_t pin, uint8_t type, uint8_t count) {
+  (void)count; // Workaround to avoid compiler warning.
   _pin = pin;
   _type = type;
 #ifdef __AVR
@@ -357,7 +360,9 @@ bool DHT::read(bool force) {
 // in the very latest IDE versions):
 //   https://github.com/arduino/Arduino/blob/master/hardware/arduino/avr/cores/arduino/wiring_pulse.c
 uint32_t DHT::expectPulse(bool level) {
-#if (F_CPU > 16000000L)
+// F_CPU is not be known at compile time on platforms such as STM32F103.
+// The preprocessor seems to evaluate it to zero in that case.
+#if (F_CPU > 16000000L) || (F_CPU == 0L)
   uint32_t count = 0;
 #else
   uint16_t count = 0; // To work fast enough on slower AVR boards

DHT.h

@@ -41,11 +41,21 @@
 #endif
 
 /* Define types of sensors. */
-#define DHT11 11  /**< DHT TYPE 11 */
-#define DHT12 12  /**< DHY TYPE 12 */
-#define DHT22 22  /**< DHT TYPE 22 */
-#define DHT21 21  /**< DHT TYPE 21 */
-#define AM2301 21 /**< AM2301 */
+static const uint8_t DHT11{11};  /**< DHT TYPE 11 */
+static const uint8_t DHT12{12};  /**< DHY TYPE 12 */
+static const uint8_t DHT21{21};  /**< DHT TYPE 21 */
+static const uint8_t DHT22{22};  /**< DHT TYPE 22 */
+static const uint8_t AM2301{21}; /**< AM2301 */
+
+#if defined(TARGET_NAME) && (TARGET_NAME == ARDUINO_NANO33BLE)
+#ifndef microsecondsToClockCycles
+/*!
+ * As of 7 Sep 2020 the Arduino Nano 33 BLE boards do not have
+ * microsecondsToClockCycles defined.
+ */
+#define microsecondsToClockCycles(a) ((a) * (SystemCoreClock / 1000000L))
+#endif
+#endif
 
 /*!
  *  @brief  Class that stores state and functions for DHT

examples/DHTtester/DHTtester.ino

@@ -20,7 +20,8 @@
 // NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1
 // to 3.3V instead of 5V!
 // Connect pin 2 of the sensor to whatever your DHTPIN is
-// Connect pin 4 (on the right) of the sensor to GROUND
+// Connect pin 3 (on the right) of the sensor to GROUND (if your sensor has 3 pins)
+// Connect pin 4 (on the right) of the sensor to GROUND and leave the pin 3 EMPTY (if your sensor has 4 pins)
 // Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
 
 // Initialize DHT sensor.

library.properties

@@ -1,5 +1,5 @@
 name=DHT sensor library
-version=1.3.9
+version=1.4.4
 author=Adafruit
 maintainer=Adafruit <info@adafruit.com>
 sentence=Arduino library for DHT11, DHT22, etc Temp & Humidity Sensors