MMA8452Q, 3-axis, 12-bit/8-bit digital accelerometer library. Developed by aconno dev team. For example program with the library, contact us.
Dependents: acd52832_BLE_VF_GeoBeacon
mma8452.cpp
- Committer:
- jurica238814
- Date:
- 2017-07-02
- Revision:
- 0:65b19bf1382a
File content as of revision 0:65b19bf1382a:
/* * Library for mma8452 3-Axis, 12-bit/8-bit, Digital Accelerometer * Made by Jurica Resetar * jurica_resetar@yahoo.com * * All rights reserved */ #include "mma8452.h" Acc_MMA8452::Acc_MMA8452(PinName sda, PinName scl, char address): i2c(sda, scl), acc_address(address){ } Acc_MMA8452::~Acc_MMA8452(){ } uint8_t Acc_MMA8452::set_register(char reg, char data){ char cmd[2] = {0, 0}; i2c.start(); cmd[0] = MODE_STATUS; cmd[1] = 0x00; // Standby Mode on i2c.write(acc_address, cmd, 2); cmd[0] = reg; cmd[1] = data; // New value of the register i2c.write(acc_address, cmd, 2); cmd[0] = MODE_STATUS; cmd[1] = 0x01; // Active Mode on i2c.write(acc_address, cmd, 2); i2c.stop(); return 0; // Success } uint8_t Acc_MMA8452::get_register(char reg, char *data){ char temp_read = 2; i2c.start(); if(i2c.write(acc_address & 0xFE) == 0){ // just good practice to force bit 1 to a '0' by ANDing with 0xFE return 1; // we failed to write the mcu address on the bus to initiate dialogue } if(i2c.write(reg) == 0){ return 1; // we failed to write 'who am i' to the chip } i2c.start(); if(i2c.write(acc_address | 0x01) == 0){ // this is asking to read the slave mcu address - even though it's a 'write' method!!! Crap API... return 1; // we failed to request a read from that mcu - this really is just writing the mcu vaule on the bus } temp_read = i2c.read(0); i2c.stop(); *data = temp_read; return 0; // Success } uint8_t Acc_MMA8452::get_x_acc(char *data){ get_register(OUT_X_MSB, data); return 0; } uint8_t Acc_MMA8452::get_y_acc(char *data){ get_register(OUT_Y_MSB, data); return 0; } uint8_t Acc_MMA8452::get_z_acc(char *data){ get_register(OUT_Z_MSB, data); return 0; }