Brzo I2C support.

examples/BME_280_BRZO_I2C_Test/BME_280_BRZO_I2C_Test.ino

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+/*
+BME280 BRZO I2C Test.ino
+This code shows how to record data from the BME280 environmental sensor
+using I2C interface and https://github.com/pasko-zh/brzo_i2c library
+on ESP8266.
+This file is an example file, part of the Arduino BME280 library.
+
+Copyright (C) 2016 Tyler Glenn
+Forked by Alex Shavlovsky
+to support https://github.com/pasko-zh/brzo_i2c library on ESP8266.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http:https://www.gnu.org/licenses/>.
+
+Written: Dec 30 2015.
+Last Updated: Sep 19 2016.
+
+Connecting the BME280 Sensor:
+Sensor -> Board
+-----------------------------
+Vin (Voltage In) -> 3.3V
+Gnd (Ground) -> Gnd
+SDA (Serial Data) -> D2 on ESP8266
+SCK (Serial Clock) -> D1 on ESP8266
+
+ */
+
+/* ==== Includes ==== */
+#include <BME280BRZO_I2C.h>
+/* ==== END Includes ==== */
+
+/* ==== Defines ==== */
+#define SERIAL_BAUD 115200
+/* ==== END Defines ==== */
+
+/* ==== Global Variables ==== */
+BME280BRZO_I2C bme; // Default : forced mode, standby time = 1000 ms
+ // Oversampling = pressure ×1, temperature ×1, humidity ×1, filter off,
+bool metric = true;
+/* ==== END Global Variables ==== */
+
+
+/* ==== Prototypes ==== */
+/* === Print a message to stream with the temp, humidity and pressure. === */
+void printBME280Data(Stream * client);
+/* === Print a message to stream with the altitude, and dew point. === */
+void printBME280CalculatedData(Stream* client);
+/* ==== END Prototypes ==== */
+
+/* ==== Setup ==== */
+void setup() {
+ Serial.begin(SERIAL_BAUD);
+ while(!Serial) {} // Wait
+ while(!bme.begin()){
+ Serial.println("Could not find BME280 sensor!");
+ delay(1000);
+ }
+}
+/* ==== END Setup ==== */
+
+/* ==== Loop ==== */
+void loop() {
+ printBME280Data(&Serial);
+ printBME280CalculatedData(&Serial);
+ delay(500);
+}
+/* ==== End Loop ==== */
+
+/* ==== Functions ==== */
+void printBME280Data(Stream* client){
+ float temp(NAN), hum(NAN), pres(NAN);
+ uint8_t pressureUnit(3); // unit: B000 = Pa, B001 = hPa, B010 = Hg, B011 = atm, B100 = bar, B101 = torr, B110 = N/m^2, B111 = psi
+ bme.read(pres, temp, hum, metric, pressureUnit); // Parameters: (float& pressure, float& temp, float& humidity, bool celsius = false, uint8_t pressureUnit = 0x0)
+ /* Alternatives to ReadData():
+ float temp(bool celsius = false);
+ float pres(uint8_t unit = 0);
+ float hum();
+
+ Keep in mind the temperature is used for humidity and
+ pressure calculations. So it is more effcient to read
+ temperature, humidity and pressure all together.
+ */
+ client->print("Temp: ");
+ client->print(temp);
+ client->print("°"+ String(metric ? 'C' :'F'));
+ client->print("\t\tHumidity: ");
+ client->print(hum);
+ client->print("% RH");
+ client->print("\t\tPressure: ");
+ client->print(pres);
+ client->print(" atm");
+}
+void printBME280CalculatedData(Stream* client){
+ float altitude = bme.alt(metric);
+ float dewPoint = bme.dew(metric);
+ client->print("\t\tAltitude: ");
+ client->print(altitude);
+ client->print((metric ? "m" : "ft"));
+ client->print("\t\tDew point: ");
+ client->print(dewPoint);
+ client->println("°"+ String(metric ? 'C' :'F'));
+
+}
+/* ==== END Functions ==== */

src/BME280BRZO_I2C.cpp

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+/*
+BME280BRZO_I2C.cpp
+This code records data from the BME280 sensor and provides an API.
+This file is part of the Arduino BME280 library.
+
+Copyright (C) 2016 Tyler Glenn
+Forked by Alex Shavlovsky
+to support https://github.com/pasko-zh/brzo_i2c library on ESP8266.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http:https://www.gnu.org/licenses/>.
+
+Written: Dec 30 2015.
+Last Updated: Jan 1 2016. - Happy New year!
+
+This header must be included in any derived code or copies of the code.
+
+Based on the data sheet provided by Bosch for the BME280BRZO_I2C environmental sensor,
+calibration code based on algorithms providedBosch, some unit conversations courtesy
+of www.endmemo.com, altitude equation courtesy of NOAA, and dew point equation
+courtesy of Brian McNoldy at http:https://andrew.rsmas.miami.edu.
+ */
+
+#include "brzo_i2c.h"
+#include "BME280BRZO_I2C.h"
+
+/****************************************************************/
+BME280BRZO_I2C::BME280BRZO_I2C
+(
+ uint8_t tosr,
+ uint8_t hosr,
+ uint8_t posr,
+ uint8_t mode,
+ uint8_t st,
+ uint8_t filter,
+ bool spiEnable, 
+ uint8_t bme_280_addr
+):BME280(tosr, hosr, posr, mode, st, filter, spiEnable), 
+ bme_280_addr(bme_280_addr)
+{
+}
+
+
+/****************************************************************/
+bool BME280BRZO_I2C::WriteRegister
+(
+ uint8_t addr,
+ uint8_t data
+)
+{
+ uint8_t bf[2];
+ bf[0] = addr;
+ bf[1] = data;
+ brzo_i2c_start_transaction(bme_280_addr, I2C_CLOCK_RATE);
+ brzo_i2c_write(bf, 2, false);
+ return (brzo_i2c_end_transaction()==0);
+}
+
+/****************************************************************/
+bool BME280BRZO_I2C::ReadRegister
+(
+ uint8_t addr,
+ uint8_t data[],
+ uint8_t length
+)
+{
+ brzo_i2c_start_transaction(bme_280_addr, I2C_CLOCK_RATE);
+ brzo_i2c_write(&addr, 1, true);
+ brzo_i2c_read(data, length, false);
+ brzo_i2c_end_transaction();
+ return (brzo_i2c_end_transaction()==0);
+}
+
+
+/****************************************************************/
+#if defined(ARDUINO_ARCH_ESP8266)
+bool BME280BRZO_I2C::begin
+(
+ int SDA,
+ int SCL
+)
+{
+ // allow config of pins
+ brzo_i2c_setup(SDA,SCL,I2C_ACK_TIMEOUT);
+ return BME280::Initialize();
+}
+
+
+/****************************************************************/
+bool BME280BRZO_I2C::begin()
+{
+ return Initialize();
+}
+#endif
+
+
+/****************************************************************/
+bool BME280BRZO_I2C::Initialize()
+{
+ brzo_i2c_setup(D2,D1,I2C_ACK_TIMEOUT);
+ return BME280::Initialize();
+}

src/BME280BRZO_I2C.h

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+/*
+BME280BRZO_I2C.h
+This code records data from the BME280 sensor and provides an API.
+This file is part of the Arduino BME280 library.
+
+Copyright (C) 2016 Tyler Glenn
+Forked by Alex Shavlovsky
+to support https://github.com/pasko-zh/brzo_i2c library on ESP8266.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http:https://www.gnu.org/licenses/>.
+
+Written: Sep 19 2016.
+Last Updated: Sep 19 2016. - Happy Fall! <5
+This code is licensed under the GNU LGPL and is open for ditrbution
+and copying in accordance with the license.
+This header must be included in any derived code or copies of the code.
+
+Based on the data sheet provided by Bosch for the Bme280 environmental sensor.
+ */
+
+#ifndef BME280BRZO_I2C_H
+#define BME280BRZO_I2C_H
+
+#ifndef I2C_CLOCK_RATE
+#define I2C_CLOCK_RATE 400
+#endif
+
+#ifndef I2C_ACK_TIMEOUT
+#define I2C_ACK_TIMEOUT 2000
+#endif
+
+#include "BME280.h"
+
+//////////////////////////////////////////////////////////////////
+/// BME280BRZO_I2C - I2C Implementation of BME280.
+class BME280BRZO_I2C: public BME280
+{
+
+public:
+
+ ///////////////////////////////////////////////////////////////
+ /// Constructor used to create the class. All parameters have 
+ /// default values.
+ BME280BRZO_I2C(
+ uint8_t tosr = 0x1,
+ uint8_t hosr = 0x1,
+ uint8_t posr = 0x1,
+ uint8_t mode = 0x1,
+ uint8_t st = 0x5,
+ uint8_t filter = 0x0,
+ bool spiEnable = false,
+ uint8_t bme_280_addr = 0x76
+ ); // Oversampling = 1, mode = forced, standby time = 1000ms, filter = none.
+
+#if defined(ARDUINO_ARCH_ESP8266)
+ ///////////////////////////////////////////////////////////////
+ /// On esp8266 it is possible to define I2C pins
+ virtual bool begin(
+ int SDA, 
+ int SCL);
+
+ virtual bool begin();
+#endif
+
+protected:
+
+ ///////////////////////////////////////////////////////////////
+ /// Method used at start up to initialize the class. Starts the 
+ /// I2C interface.
+ virtual bool Initialize();
+
+private:
+
+ uint8_t bme_280_addr;
+
+ //////////////////////////////////////////////////////////////////
+ /// Write values to BME280 registers.
+ virtual bool WriteRegister(
+ uint8_t addr, 
+ uint8_t data);
+
+ /////////////////////////////////////////////////////////////////
+ /// Read values from BME280 registers.
+ virtual bool ReadRegister(
+ uint8_t addr,
+ uint8_t data[],
+ uint8_t length);
+
+};
+#endif // BME280BRZO_I2C_H