Minor changes to the MMA8451Q library.
Fork of MMA8451Q by
MMA8451Q.cpp
- Committer:
- emilmont
- Date:
- 2012-10-11
- Revision:
- 0:6149091f755d
- Child:
- 1:d2630136d51e
File content as of revision 0:6149091f755d:
#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}; write_regs(data, 2); } MMA8451Q::~MMA8451Q() { } uint8_t MMA8451Q::getWhoAmI() { uint8_t who_am_i = 0; read_regs(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]; read_regs(addr, res, 2); acc = (res[0] << 6) | (res[1] >> 2); if (acc > UINT14_MAX/2) acc -= UINT14_MAX; return acc; } void MMA8451Q::read_regs(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::write_regs(uint8_t * data, int len) { m_i2c.write(m_addr, (char *)data, len); }