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Diffstat (limited to 'tool/mbed/mbed-sdk/libraries/tests/peripherals/MMA8451Q/MMA8451Q.cpp')
-rw-r--r-- | tool/mbed/mbed-sdk/libraries/tests/peripherals/MMA8451Q/MMA8451Q.cpp | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/tool/mbed/mbed-sdk/libraries/tests/peripherals/MMA8451Q/MMA8451Q.cpp b/tool/mbed/mbed-sdk/libraries/tests/peripherals/MMA8451Q/MMA8451Q.cpp new file mode 100644 index 0000000000..9bdf87af51 --- /dev/null +++ b/tool/mbed/mbed-sdk/libraries/tests/peripherals/MMA8451Q/MMA8451Q.cpp @@ -0,0 +1,81 @@ +/* Copyright (c) 2010-2011 mbed.org, MIT License +* +* 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 THE AUTHORS OR COPYRIGHT HOLDERS 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. +*/ + +#include "MMA8451Q.h" + +#define REG_WHO_AM_I 0x0D +#define REG_CTRL_REG_1 0x2A +#define REG_OUT_X_MSB 0x01 +#define REG_OUT_Y_MSB 0x03 +#define REG_OUT_Z_MSB 0x05 + +#define UINT14_MAX 16383 + +MMA8451Q::MMA8451Q(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) { + // activate the peripheral + uint8_t data[2] = {REG_CTRL_REG_1, 0x01}; + writeRegs(data, 2); +} + +MMA8451Q::~MMA8451Q() { } + +uint8_t MMA8451Q::getWhoAmI() { + uint8_t who_am_i = 0; + readRegs(REG_WHO_AM_I, &who_am_i, 1); + return who_am_i; +} + +int16_t MMA8451Q::getAccX() { + return getAccAxis(REG_OUT_X_MSB); +} + +int16_t MMA8451Q::getAccY() { + return getAccAxis(REG_OUT_Y_MSB); +} + +int16_t MMA8451Q::getAccZ() { + return getAccAxis(REG_OUT_Z_MSB); +} + +void MMA8451Q::getAccAllAxis(int16_t * res) { + res[0] = getAccX(); + res[1] = getAccY(); + res[2] = getAccZ(); +} + +int16_t MMA8451Q::getAccAxis(uint8_t addr) { + int16_t acc; + uint8_t res[2]; + readRegs(addr, res, 2); + + acc = (res[0] << 6) | (res[1] >> 2); + if (acc > UINT14_MAX/2) + acc -= UINT14_MAX; + + return acc; +} + +void MMA8451Q::readRegs(int addr, uint8_t * data, int len) { + char t[1] = {addr}; + m_i2c.write(m_addr, t, 1, true); + m_i2c.read(m_addr, (char *)data, len); +} + +void MMA8451Q::writeRegs(uint8_t * data, int len) { + m_i2c.write(m_addr, (char *)data, len); +} |