Darley Gonzalez / Mbed 2 deprecated I2C_Slave

Programa

Dependencies:   mbed

MMA8451Q.cpp@0:782b008e3b3a, 2021-03-02 (annotated)

Committer:
darley_gonzalez
Date:
Tue Mar 02 22:37:23 2021 +0000
Revision:
0:782b008e3b3a
I2c Slave

Who changed what in which revision?

UserRevisionLine numberNew contents of line
darley_gonzalez 0:782b008e3b3a 1 #include "MMA8451Q.h"
darley_gonzalez 0:782b008e3b3a 2
darley_gonzalez 0:782b008e3b3a 3 #define REG_WHO_AM_I 0x0D
darley_gonzalez 0:782b008e3b3a 4 #define REG_CTRL_REG_1 0x2A
darley_gonzalez 0:782b008e3b3a 5 #define REG_OUT_X_MSB 0x01
darley_gonzalez 0:782b008e3b3a 6 #define REG_OUT_Y_MSB 0x03
darley_gonzalez 0:782b008e3b3a 7 #define REG_OUT_Z_MSB 0x05
darley_gonzalez 0:782b008e3b3a 8
darley_gonzalez 0:782b008e3b3a 9 #define UINT14_MAX 16383
darley_gonzalez 0:782b008e3b3a 10
darley_gonzalez 0:782b008e3b3a 11 MMA8451Q::MMA8451Q(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr) {
darley_gonzalez 0:782b008e3b3a 12 // activate the peripheral
darley_gonzalez 0:782b008e3b3a 13 uint8_t data[2] = {REG_CTRL_REG_1, 0x01};
darley_gonzalez 0:782b008e3b3a 14 writeRegs(data, 2);
darley_gonzalez 0:782b008e3b3a 15 }
darley_gonzalez 0:782b008e3b3a 16
darley_gonzalez 0:782b008e3b3a 17 MMA8451Q::~MMA8451Q() { }
darley_gonzalez 0:782b008e3b3a 18
darley_gonzalez 0:782b008e3b3a 19 uint8_t MMA8451Q::getWhoAmI() {
darley_gonzalez 0:782b008e3b3a 20 uint8_t who_am_i = 0;
darley_gonzalez 0:782b008e3b3a 21 readRegs(REG_WHO_AM_I, &who_am_i, 1);
darley_gonzalez 0:782b008e3b3a 22 return who_am_i;
darley_gonzalez 0:782b008e3b3a 23 }
darley_gonzalez 0:782b008e3b3a 24
darley_gonzalez 0:782b008e3b3a 25 float MMA8451Q::getAccX() {
darley_gonzalez 0:782b008e3b3a 26 return (float(getAccAxis(REG_OUT_X_MSB))/4096.0);
darley_gonzalez 0:782b008e3b3a 27 }
darley_gonzalez 0:782b008e3b3a 28
darley_gonzalez 0:782b008e3b3a 29 float MMA8451Q::getAccY() {
darley_gonzalez 0:782b008e3b3a 30 return (float(getAccAxis(REG_OUT_Y_MSB))/4096.0);
darley_gonzalez 0:782b008e3b3a 31 }
darley_gonzalez 0:782b008e3b3a 32
darley_gonzalez 0:782b008e3b3a 33 float MMA8451Q::getAccZ() {
darley_gonzalez 0:782b008e3b3a 34 return (float(getAccAxis(REG_OUT_Z_MSB))/4096.0);
darley_gonzalez 0:782b008e3b3a 35 }
darley_gonzalez 0:782b008e3b3a 36
darley_gonzalez 0:782b008e3b3a 37 void MMA8451Q::getAccAllAxis(float * res) {
darley_gonzalez 0:782b008e3b3a 38 res[0] = getAccX();
darley_gonzalez 0:782b008e3b3a 39 res[1] = getAccY();
darley_gonzalez 0:782b008e3b3a 40 res[2] = getAccZ();
darley_gonzalez 0:782b008e3b3a 41 }
darley_gonzalez 0:782b008e3b3a 42
darley_gonzalez 0:782b008e3b3a 43 int16_t MMA8451Q::getAccAxis(uint8_t addr) {
darley_gonzalez 0:782b008e3b3a 44 int16_t acc;
darley_gonzalez 0:782b008e3b3a 45 uint8_t res[2];
darley_gonzalez 0:782b008e3b3a 46 readRegs(addr, res, 2);
darley_gonzalez 0:782b008e3b3a 47
darley_gonzalez 0:782b008e3b3a 48 acc = (res[0] << 6) | (res[1] >> 2);
darley_gonzalez 0:782b008e3b3a 49 if (acc > UINT14_MAX/2)
darley_gonzalez 0:782b008e3b3a 50 acc -= UINT14_MAX;
darley_gonzalez 0:782b008e3b3a 51
darley_gonzalez 0:782b008e3b3a 52 return acc;
darley_gonzalez 0:782b008e3b3a 53 }
darley_gonzalez 0:782b008e3b3a 54
darley_gonzalez 0:782b008e3b3a 55 void MMA8451Q::readRegs(int addr, uint8_t * data, int len) {
darley_gonzalez 0:782b008e3b3a 56 char t[1] = {0};
darley_gonzalez 0:782b008e3b3a 57 t[1] =addr;
darley_gonzalez 0:782b008e3b3a 58 m_i2c.write(m_addr, t, 1, true);
darley_gonzalez 0:782b008e3b3a 59 m_i2c.read(m_addr, (char *)data, len);
darley_gonzalez 0:782b008e3b3a 60 }
darley_gonzalez 0:782b008e3b3a 61
darley_gonzalez 0:782b008e3b3a 62 void MMA8451Q::writeRegs(uint8_t * data, int len) {
darley_gonzalez 0:782b008e3b3a 63 m_i2c.write(m_addr, (char *)data, len);
darley_gonzalez 0:782b008e3b3a 64 }