feat: 全量同步 254 个常用的 Arduino 扩展库文件

arduino-libs/arduino-cli/libraries/Adafruit_HTU21DF/Adafruit_HTU21DF.cpp

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+/*!
+ * @file Adafruit_HTU21DF.cpp
+ *
+ * @mainpage Adafruit HTU21DF Sensor
+ *
+ * @section intro_sec Introduction
+ *
+ * This is a library for the HTU21DF Humidity & Temp Sensor
+ *
+ * Designed specifically to work with the HTU21DF sensor from Adafruit
+ * ----> https://www.adafruit.com/products/1899
+ *
+ * These displays use I2C to communicate, 2 pins are required to
+ * interface
+ * Adafruit invests time and resources providing this open source code,
+ * please support Adafruit and open-source hardware by purchasing
+ * products from Adafruit!
+ *
+ * @section author Author
+ *
+ * Written by Limor Fried/Ladyada for Adafruit Industries.
+ *
+ * @section license License
+ *
+ * BSD license, all text above must be included in any redistribution
+ */
+
+#include "Adafruit_HTU21DF.h"
+
+#if defined(__AVR__)
+#include <util/delay.h>
+#endif
+
+/**
+ * Constructor for the HTU21DF driver.
+ */
+Adafruit_HTU21DF::Adafruit_HTU21DF() {
+  /* Assign default values to internal tracking variables. */
+  _last_humidity = 0.0f;
+  _last_temp = 0.0f;
+}
+
+/**
+ * Initialises the I2C transport, and configures the IC for normal operation.
+ *
+ * @return true (1) if the device was successfully initialised, otherwise
+ *         false (0).
+ */
+boolean Adafruit_HTU21DF::begin(void) {
+  Wire.begin();
+
+  reset();
+
+  Wire.beginTransmission(HTU21DF_I2CADDR);
+  Wire.write(HTU21DF_READREG);
+  Wire.endTransmission();
+  Wire.requestFrom(HTU21DF_I2CADDR, 1);
+  return (Wire.read() == 0x2); // after reset should be 0x2
+}
+
+/**
+ * Sends a 'reset' request to the HTU21DF, followed by a 15ms delay.
+ */
+void Adafruit_HTU21DF::reset(void) {
+  Wire.beginTransmission(HTU21DF_I2CADDR);
+  Wire.write(HTU21DF_RESET);
+  Wire.endTransmission();
+  delay(15);
+}
+
+/**
+ * Performs a single temperature conversion in degrees Celsius.
+ *
+ * @return a single-precision (32-bit) float value indicating the measured
+ *         temperature in degrees Celsius.
+ */
+float Adafruit_HTU21DF::readTemperature(void) {
+  // OK lets ready!
+  Wire.beginTransmission(HTU21DF_I2CADDR);
+  Wire.write(HTU21DF_READTEMP);
+  Wire.endTransmission();
+
+  delay(50); // add delay between request and actual read!
+
+  uint8_t count = Wire.requestFrom(HTU21DF_I2CADDR, 3);
+
+  /* Make sure we got 3 bytes back. */
+  if (count != 3) {
+    return 0.0f;
+  }
+
+  /* Read 16 bits of data, dropping the last two status bits. */
+  uint16_t t = Wire.read();
+  t <<= 8;
+  t |= Wire.read() & 0b11111100;
+
+  uint8_t crc = Wire.read();
+  (void)crc;
+
+  float temp = t;
+  temp *= 175.72f;
+  temp /= 65536.0f;
+  temp -= 46.85f;
+
+  /* Track the value internally in case we need to access it later. */
+  _last_temp = temp;
+
+  return temp;
+}
+
+/**
+ * Performs a single relative humidity conversion.
+ *
+ * @return A single-precision (32-bit) float value indicating the relative
+ *         humidity in percent (0..100.0%).
+ */
+float Adafruit_HTU21DF::readHumidity(void) {
+  /* Prepare the I2C request. */
+  Wire.beginTransmission(HTU21DF_I2CADDR);
+  Wire.write(HTU21DF_READHUM);
+  Wire.endTransmission();
+
+  /* Wait a bit for the conversion to complete. */
+  delay(50);
+
+  /* Read the conversion results. */
+  uint8_t count = Wire.requestFrom(HTU21DF_I2CADDR, 3);
+
+  /* Make sure we got 3 bytes back. */
+  if (count != 3) {
+    return 0.0f;
+  }
+
+  /* Read 16 bits of data, dropping the last two status bits. */
+  uint16_t h = Wire.read();
+  h <<= 8;
+  h |= Wire.read() & 0b11111100;
+
+  uint8_t crc = Wire.read();
+  (void)crc;
+
+  float hum = h;
+  hum *= 125.0f;
+  hum /= 65536.0f;
+  hum -= 6.0f;
+
+  /* Track the value internally in case we need to access it later. */
+  _last_humidity = hum;
+
+  return hum;
+}