/***************************************************************************
  This is a library for the BME280 humidity, temperature & pressure sensor

  Designed specifically to work with the Adafruit BME280 Breakout
  ----> http://www.adafruit.com/products/2650

  These sensors use I2C or SPI to communicate, 2 or 4 pins are required
  to interface. The device's I2C address is either 0x76 or 0x77.

  Adafruit invests time and resources providing this open source code,
  please support Adafruit andopen-source hardware by purchasing products
  from Adafruit!

  Written by Limor Fried & Kevin Townsend for Adafruit Industries.
  BSD license, all text above must be included in any redistribution
  See the LICENSE file for details.
 ***************************************************************************/

/*
Adapted by Starbeamrainbowlabs <https://starbeamrainbowlabs.com/>
GitHub: @sbrl | Twitter: @SBRLabs | Reddit: u/Starbeamrainbowlabs

# PROTOCOL SPEC
## INPUT
4 character commands. Whitespace and non-printable characters are ignored.

### COMMANDS
Command	| Meaning
--------|-----------------------------------------------------------
read	| Read the sensor values and write the result to stdout

*/

#include <Wire.h>
#include <SPI.h>
// These libraries need installing in the Arduino IDE Library Manager (if you install the BME280 one it should prompt for the unified sensor library automatically)
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>

#define BME_SCK 13
#define BME_MISO 12
#define BME_MOSI 11
#define BME_CS 10


#define SEALEVELPRESSURE_HPA (1013.25)

Adafruit_BME280 bme; // I2C
//Adafruit_BME280 bme(BME_CS); // hardware SPI
//Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI


// Read buffer
#define BUFFER_SIZE 4

int bufferIndex = 0;
char buffer[BUFFER_SIZE];

void setup() {
    Serial.begin(9600);
    while(!Serial);    // time to get serial running
    Serial.println(F("BME280 test"));

    unsigned status;
    
    // default settings
    status = bme.begin(0x76);  
    // You can also pass in a Wire library object like &Wire2
    // status = bme.begin(0x76, &Wire2)
    if (!status) {
        Serial.println("Could not find a valid BME280 sensor, check wiring, address, sensor ID!");
        Serial.print("SensorID was: 0x"); Serial.println(bme.sensorID(),16);
        Serial.print("        ID of 0xFF probably means a bad address, a BMP 180 or BMP 085\n");
        Serial.print("   ID of 0x56-0x58 represents a BMP 280,\n");
        Serial.print("        ID of 0x60 represents a BME 280.\n");
        Serial.print("        ID of 0x61 represents a BME 680.\n");
        while (1) delay(10);
    }
    
    Serial.println("-- Default Test --");

    Serial.println();
}


void loop() {
    while(Serial.available() > 0) {
        buffer[bufferIndex] = Serial.read();
        
        // Serial.print("Reading char, index: ");
        // Serial.print(bufferIndex, DEC);
        // Serial.print(", is greater: ");
        // Serial.print(bufferIndex >= BUFFER_SIZE);
        // Serial.print(", char: ");
        // Serial.print(buffer[bufferIndex]);
        // Serial.print(", hex: ");
        // Serial.println(buffer[bufferIndex], HEX);
        
        // If it's a newline character, overwrite it
        if(buffer[bufferIndex] < 48 || buffer[bufferIndex] > 122) {
            // Serial.println("Skipping unrecognised char");
            continue;
        }
        
        if(bufferIndex >= BUFFER_SIZE - 1) {
            // Serial.println("Handling command");
            handle_command();
            // Serial.print("Resetting index, is now: ");
            bufferIndex = 0;
            // Serial.println(bufferIndex, DEC);
            continue;
        }
        
        // Serial.println("Incrementing counter");
        bufferIndex += 1;
    }
}

void handle_command() {
    // Serial.print("strcmp: ");
    // Serial.println(strncmp(buffer, "read", BUFFER_SIZE), DEC);
    
    if(strncmp(buffer, "read", BUFFER_SIZE) == 0) { // 0 = They are the same
        printValues();
    }
    else {
        Serial.print("Error: Unknown command ");
        Serial.println(buffer);
    }
}


void printValues() {
    Serial.print("Temperature ");
    Serial.println(bme.readTemperature());
    // Serial.println(" *C");

    Serial.print("Pressure ");

    Serial.println(bme.readPressure() / 100.0F);
    // Serial.println(" hPa");

    Serial.print("ApproxAltitude ");
    Serial.println(bme.readAltitude(SEALEVELPRESSURE_HPA));
    // Serial.println(" m");

    Serial.print("Humidity ");
    Serial.println(bme.readHumidity());
    // Serial.println(" %");

    // Serial.println();
}