Added BME280 driver

hardware/BME280.h

@@ -0,0 +1,113 @@
+#ifndef bme280_H
+#define bme280_H
+
+#include <avr/io.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include "device.h"
+#include "util/time.h"
+
+#define BME280_TEMPERATURE_ADJUSTMENT 0
+
+#define BME280_TEMP_UNDEFINED -274
+#define BME280_PRESSURE_UNDEFINED -1
+#define BME280_HUMIDITY_UNDEFINED -1
+
+#define BME280_REGISTER_DIG_T1 0x88
+#define BME280_REGISTER_DIG_T2 0x8A
+#define BME280_REGISTER_DIG_T3 0x8C
+#define BME280_REGISTER_DIG_P1 0x8E
+#define BME280_REGISTER_DIG_P2 0x90
+#define BME280_REGISTER_DIG_P3 0x92
+#define BME280_REGISTER_DIG_P4 0x94
+#define BME280_REGISTER_DIG_P5 0x96
+#define BME280_REGISTER_DIG_P6 0x98
+#define BME280_REGISTER_DIG_P7 0x9A
+#define BME280_REGISTER_DIG_P8 0x9C
+#define BME280_REGISTER_DIG_P9 0x9E
+#define BME280_REGISTER_DIG_H1 0xA1
+#define BME280_REGISTER_DIG_H2 0xE1
+#define BME280_REGISTER_DIG_H3 0xE3
+#define BME280_REGISTER_DIG_H4 0xE4
+#define BME280_REGISTER_DIG_H5 0xE5
+#define BME280_REGISTER_DIG_H6 0xE7
+#define BME280_REGISTER_CHIPID 0xD0
+#define BME280_REGISTER_VERSION 0xD1
+#define BME280_REGISTER_SOFTRESET 0xE0
+#define BME280_REGISTER_CAL26 0xE1 // R calibration stored in 0xE1-0xF0
+#define BME280_REGISTER_CONTROLHUMID 0xF2
+#define BME280_REGISTER_STATUS 0XF3
+#define BME280_REGISTER_CONTROL 0xF4
+#define BME280_REGISTER_CONFIG 0xF5
+#define BME280_REGISTER_PRESSUREDATA 0xF7
+#define BME280_REGISTER_TEMPDATA 0xFA
+#define BME280_REGISTER_HUMIDDATA 0xFD
+
+#define BME280_SAMPLING_NONE 0b000
+#define BME280_SAMPLING_X1 0b001
+#define BME280_SAMPLING_X2 0b010
+#define BME280_SAMPLING_X4 0b011
+#define BME280_SAMPLING_X8 0b100
+#define BME280_SAMPLING_X16 0b101
+
+#define BME280_MODE_SLEEP 0b00
+#define BME280_MODE_FORCED 0b01
+#define BME280_MODE_NORMAL 0b11
+
+#define BME280_FILTER_OFF 0b000
+#define BME280_FILTER_X2 0b001
+#define BME280_FILTER_X4 0b010
+#define BME280_FILTER_X8 0b011
+#define BME280_FILTER_X16 0b100
+
+#define BME280_STANDBY_MS_0_5 0b000
+#define BME280_STANDBY_MS_10 0b110
+#define BME280_STANDBY_MS_20 0b111
+#define BME280_STANDBY_MS_62_5 0b001
+#define BME280_STANDBY_MS_125 0b010
+#define BME280_STANDBY_MS_250 0b011
+#define BME280_STANDBY_MS_500 0b100
+#define BME280_STANDBY_MS_1000 0b101
+
+
+typedef struct {
+  uint16_t dig_T1; // temperature compensation value
+  int16_t dig_T2;  // temperature compensation value
+  int16_t dig_T3;  // temperature compensation value
+
+  uint16_t dig_P1; // pressure compensation value
+  int16_t dig_P2;  // pressure compensation value
+  int16_t dig_P3;  // pressure compensation value
+  int16_t dig_P4;  // pressure compensation value
+  int16_t dig_P5;  // pressure compensation value
+  int16_t dig_P6;  // pressure compensation value
+  int16_t dig_P7;  // pressure compensation value
+  int16_t dig_P8;  // pressure compensation value
+  int16_t dig_P9;  // pressure compensation value
+
+  uint8_t dig_H1;  // humidity compensation value
+  int16_t dig_H2;  // humidity compensation value
+  uint8_t dig_H3;  // humidity compensation value
+  int16_t dig_H4;  // humidity compensation value
+  int16_t dig_H5;  // humidity compensation value
+  int8_t dig_H6;   // humidity compensation value
+} bme280_calib_data;
+
+bool bme280_init(uint8_t cs_usrio_pin);
+bool bme280_poll(void);
+
+bool bme280_installed;
+bool bme280_ready;
+uint8_t bme280_cs_usrio_pin;
+
+int32_t bme280_temperature_fine_adjust;
+int32_t bme280_temperature_fine;
+
+float bme280_temperature;
+float bme280_pressure;
+float bme280_humidity;
+
+bme280_calib_data bme280_calibration;
+
+#endif