BLE SENSORS TAG BMP180
Dependents: LinkNode_BMP180 LinkNode_BMP180_derron
Fork of BMP180 by
Diff: BMP180.cpp
- Revision:
- 0:b2219e6e444b
- Child:
- 1:068fdec73319
diff -r 000000000000 -r b2219e6e444b BMP180.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/BMP180.cpp Fri Apr 17 09:31:09 2015 -0500 @@ -0,0 +1,268 @@ +/******************************************************************************* + * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES + * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Except as contained in this notice, the name of Maxim Integrated + * Products, Inc. shall not be used except as stated in the Maxim Integrated + * Products, Inc. Branding Policy. + * + * The mere transfer of this software does not imply any licenses + * of trade secrets, proprietary technology, copyrights, patents, + * trademarks, maskwork rights, or any other form of intellectual + * property whatsoever. Maxim Integrated Products, Inc. retains all + * ownership rights. + ******************************************************************************* + */ + +#include "BMP180.h" + +/***** Definitions *****/ +#define I2C_ADDR (0xEE) // 1110111x + +#define REG_ADDR_RESET (0xE0) +#define REG_ADDR_ID (0xD0) +#define REG_ADDR_CTRL (0xF4) +#define REG_ADDR_DATA (0xF6) +#define REG_ADDR_AC1 (0xAA) + +#define CTRL_REG_TEMP (0x2E) +#define CTRL_REG_PRESS_0 (0x34) +#define CTRL_REG_PRESS_1 (0x74) +#define CTRL_REG_PRESS_2 (0xB4) +#define CTRL_REG_PRESS_3 (0xF4) + +//****************************************************************************** +BMP180::BMP180(PinName sda, PinName scl) +{ + i2c_ = new I2C(sda, scl); + i2c_owner = true; + + i2c_->frequency(400000); +} + +//****************************************************************************** +BMP180::BMP180(I2C *i2c) : + i2c_(i2c) +{ + i2c_owner = false; +} + +//****************************************************************************** +BMP180::~BMP180() +{ + if(i2c_owner) { + delete i2c_; + } +} + +//****************************************************************************** +int BMP180::init(void) +{ + char addr; + char data[22]; + int i; + + if (checkId() != 0) { + return -1; + } + + addr = REG_ADDR_AC1; + if (i2c_->write(I2C_ADDR, &addr, 1) != 0) { + return -1; + } + + if (i2c_->read(I2C_ADDR, data, 22) != 0) { + return -1; + } + + for (i = 0; i < 11; i++) { + calib.value[i] = (data[2*i] << 8) | data[(2*i)+1]; + } + + return 0; +} + +//****************************************************************************** +int BMP180::reset(void) +{ + char data; + + data = REG_ADDR_RESET; + if (i2c_->write(I2C_ADDR, &data, 1) != 0) { + return -1; + } + + data = 0xB6; + if (i2c_->write(I2C_ADDR, &data, 1) != 0) { + return -1; + } + + return 0; +} + +//****************************************************************************** +int BMP180::checkId(void) +{ + char addr; + char data; + + addr = REG_ADDR_ID; + if (i2c_->write(I2C_ADDR, &addr, 1) != 0) { + return -1; + } + + if (i2c_->read(I2C_ADDR, &data, 1) != 0) { + return -1; + } + + if (data != 0x55) { + return -1; + } + + return 0; +} + +//****************************************************************************** +int BMP180::startPressure(BMP180::oversampling_t oss) +{ + char data[2]; + + data[0] = REG_ADDR_CTRL; + data[1] = CTRL_REG_PRESS_0 | ((oss & 0x3) << 6); + oss_ = oss; + + if (i2c_->write(I2C_ADDR, data, 2) != 0) { + return -1; + } + + return 0; +} + +//****************************************************************************** +int BMP180::getPressure(int *pressure) +{ + char addr, byte[3]; + uint32_t up; + int32_t b6, x1, x2, x3, b3, p; + uint32_t b4, b7; + + addr = REG_ADDR_DATA; + if (i2c_->write(I2C_ADDR, &addr, 1) != 0) { + return -1; + } + + if (i2c_->read(I2C_ADDR, byte, 3) != 0) { + return -1; + } + + up = ((byte[0] << 16) | (byte[1] << 8) | byte[2]) >> (8 - oss_); + + b6 = b5 - 4000; + x1 = (b6 * b6) >> 12; + x1 *= calib.b2; + x1 >>= 11; + x2 = calib.ac2 * b6; + x2 >>= 11; + x3 = x1 + x2; + b3 = (((((int32_t)calib.ac1) * 4 + x3) << oss_) + 2); + b3 >>= 2; + + x1 = (calib.ac3 * b6) >> 13; + x2 = (calib.b1 * ((b6 * b6) >> 12)) >> 16; + x3 = (x1 + x2 + 2) >> 2; + b4 = (calib.ac4 * (uint32_t)(x3 + 32768)) >> 15; + b7 = ((uint32_t)up - b3) * (50000 >> oss_); + p = ((b7 < 0x80000000) ? ((b7 << 1) / b4) : ((b7 / b4) * 2)); + x1 = p >> 8; + x1 *= x1; + x1 = (x1 * 3038) >> 16; + x2 = (-7357 * p) >> 16; + p += (x1 + x2 + 3791) >> 4; + + *pressure = p; + + return 0; +} + +//****************************************************************************** +int BMP180::startTemperature(void) +{ + char data[2] = { REG_ADDR_CTRL, CTRL_REG_TEMP }; + + if (i2c_->write(I2C_ADDR, data, 2) != 0) { + return -1; + } + + return 0; +} + +//****************************************************************************** +int BMP180::getTemperature(float *tempC) +{ + char addr, byte[2]; + uint16_t ut; + int32_t x1, x2; + + addr = REG_ADDR_DATA; + if (i2c_->write(I2C_ADDR, &addr, 1) != 0) { + return -1; + } + + if (i2c_->read(I2C_ADDR, byte, 2) != 0) { + return -1; + } + + ut = (byte[0] << 8) | byte[1]; + + x1 = ((ut - calib.ac6) * calib.ac5) >> 15; + x2 = (calib.mc << 11) / (x1 + calib.md); + b5 = x1 + x2; + + *tempC = (float)(b5 + 8) / 160; + + return 0; +} + +//****************************************************************************** +int BMP180::getTemperature(int16_t *tempCx10) +{ + char addr, byte[2]; + uint16_t ut; + int32_t x1, x2; + + addr = REG_ADDR_DATA; + if (i2c_->write(I2C_ADDR, &addr, 1) != 0) { + return -1; + } + + if (i2c_->read(I2C_ADDR, byte, 2) != 0) { + return -1; + } + + ut = (byte[0] << 8) | byte[1]; + + x1 = ((ut - calib.ac6) * calib.ac5) >> 15; + x2 = (calib.mc << 11) / (x1 + calib.md); + b5 = x1 + x2; + + *tempCx10 = (b5 + 8) >> 4; + + return 0; +}