From 7caffb47d6fc9426b2f65ad6bdd6197b324fb68a Mon Sep 17 00:00:00 2001 From: Bernhard Tittelbach Date: Sun, 12 Jun 2016 06:59:34 +0200 Subject: basic bmp280 lib (mostly adafruit reimplementation) and example --- lib/bmp280.h | 107 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 107 insertions(+) create mode 100644 lib/bmp280.h (limited to 'lib/bmp280.h') diff --git a/lib/bmp280.h b/lib/bmp280.h new file mode 100644 index 0000000..22472e3 --- /dev/null +++ b/lib/bmp280.h @@ -0,0 +1,107 @@ +/* + * spreadspace avr utils + * + * + * Copyright (C) 2016 Bernhard Tittelbach + * appreciative nod to Adafruit for writing a great example, go buy their stuff + * + * This file is part of spreadspace avr utils. + * + * spreadspace avr utils 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 + * any later version. + * + * spreadspace avr utils 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 spreadspace avr utils. If not, see . + */ + +#ifndef SPREADAVR_bmp280_h_INCLUDED +#define SPREADAVR_bmp280_h_INCLUDED + +#ifdef __cplusplus +extern "C" { +#endif + +#define BMP280_AVERAGE_SEA_LEVEL_PRESSURE 1013.25 +#define BMP280_LUFA_SPIO_OPTIONS SPI_SPEED_FCPU_DIV_16 | SPI_MODE_MASTER | SPI_ORDER_MSB_FIRST | SPI_SCK_LEAD_RISING | SPI_SAMPLE_LEADING + +/*========================================================================= + REGISTERS + -----------------------------------------------------------------------*/ + enum + { + BMP280_REGISTER_DIG_T1 = 0x88, + BMP280_REGISTER_DIG_T2 = 0x8A, + BMP280_REGISTER_DIG_T3 = 0x8C, + + BMP280_REGISTER_DIG_P1 = 0x8E, + BMP280_REGISTER_DIG_P2 = 0x90, + BMP280_REGISTER_DIG_P3 = 0x92, + BMP280_REGISTER_DIG_P4 = 0x94, + BMP280_REGISTER_DIG_P5 = 0x96, + BMP280_REGISTER_DIG_P6 = 0x98, + BMP280_REGISTER_DIG_P7 = 0x9A, + BMP280_REGISTER_DIG_P8 = 0x9C, + BMP280_REGISTER_DIG_P9 = 0x9E, + + BMP280_REGISTER_CHIPID = 0xD0, + BMP280_REGISTER_VERSION = 0xD1, + BMP280_REGISTER_SOFTRESET = 0xE0, + + BMP280_REGISTER_CAL26 = 0xE1, // R calibration stored in 0xE1-0xF0 + + BMP280_REGISTER_CONTROL = 0xF4, + BMP280_REGISTER_CONFIG = 0xF5, + BMP280_REGISTER_PRESSUREDATA = 0xF7, + BMP280_REGISTER_TEMPDATA = 0xFA, + }; + +/*=========================================================================*/ + + +/*========================================================================= + CALIBRATION DATA + -----------------------------------------------------------------------*/ + typedef struct + { + volatile uint8_t *cs_port; + uint8_t cs_pin; + uint16_t dig_T1; + int16_t dig_T2; + int16_t dig_T3; + + uint16_t dig_P1; + int16_t dig_P2; + int16_t dig_P3; + int16_t dig_P4; + int16_t dig_P5; + int16_t dig_P6; + int16_t dig_P7; + int16_t dig_P8; + int16_t dig_P9; + + uint8_t dig_H1; + int16_t dig_H2; + uint8_t dig_H3; + int16_t dig_H4; + int16_t dig_H5; + int8_t dig_H6; + } bmp280_sensor; +/*=========================================================================*/ + + +//make sure to configure the cs_pin as OUTPUT beforehand +//make sure to configure SPI beforehand +void bmp280_init(bmp280_sensor *sensor, volatile uint8_t *cs_port, uint8_t cs_pin); +float bmp280_readTemp(bmp280_sensor *sensor); +float bmp280_readPressure(bmp280_sensor *sensor); +float bmp280_readAltitude(bmp280_sensor *sensor, float sealevelp); + + +#endif \ No newline at end of file -- cgit v1.2.3