This lib was build for reading the 3 IMU unit sensors of Altimu10v4 board (https://www.pololu.com/product/2470).
Diff: ALTIMU.cpp
- Revision:
- 1:8cc36ccb8d58
- Parent:
- 0:08c9e51e6fd6
- Child:
- 2:3e874281c0f0
--- a/ALTIMU.cpp Mon Oct 15 02:14:19 2018 +0000 +++ b/ALTIMU.cpp Mon Oct 15 05:26:28 2018 +0000 @@ -27,30 +27,28 @@ write_reg(LSM303_ADDR, 0x24, 0x78); write_reg(LSM303_ADDR, 0x26, 0x00); // End LSM303 configuration. + // LPS25H configuration - write_reg(LPS25H_ADDR, 0x10, 0x05); - write_reg(LPS25H_ADDR, 0x2e, 0xdf); - write_reg(LPS25H_ADDR, 0x21, 0x40); + + //write_reg(LPS25H_ADDR, 0x10, 0x05); + //write_reg(LPS25H_ADDR, 0x2e, 0xdf); + //write_reg(LPS25H_ADDR, 0x21, 0x40); write_reg(LPS25H_ADDR, 0x20, 0x90); } // L3GD30 read data function, -bool Altimu::read_L3GD20(float *gx, float *gy, float *gz) { +void Altimu::read_L3GD20(float *gx, float *gy, float *gz) { char gyr[6]; - if (recv(L3GD20_ADDR, 0x28, gyr, 6)) { + recv(L3GD20_ADDR, 0x28, gyr, 6); //scale is 8.75 mdps/digit *gx = float(short(gyr[1] << 8 | gyr[0]))*0.00875; *gy = float(short(gyr[3] << 8 | gyr[2]))*0.00875; *gz = float(short(gyr[5] << 8 | gyr[4]))*0.00875; - return true; - } - return false; } // LSM303D read data function. -bool Altimu::read_LSM303D(float *ax, float *ay, float *az, float *mx, float *my, float *mz) { - char acc[6], mag[6]; - - if (recv(LSM303_ADDR, 0x28, acc, 6) && recv(LSM303_ADDR, 0x08, mag, 6)) { +void Altimu::read_LSM303D(float *ax, float *ay, float *az, float *mx, float *my, float *mz) { + char acc[6], mag[6]; + recv(LSM303_ADDR, 0x28, acc, 6) && recv(LSM303_ADDR, 0x08, mag, 6); *ax = float(short(acc[1] << 8 | acc[0]))*0.061; //32768/4=8192 *ay = float(short(acc[3] << 8 | acc[2]))*0.061; *az = float(short(acc[5] << 8 | acc[4]))*0.061; @@ -58,37 +56,43 @@ *mx = float(short(mag[0] << 8 | mag[1]))*0.16; *mz = float(short(mag[2] << 8 | mag[3]))*0.16; *my = float(short(mag[4] << 8 | mag[5]))*0.16; - - return true; - } - - return false; } // LPS25H read data function. void Altimu::read_LPS25H(float *press, float *alt) { - char dt[3]; - dt[0] = 0x28 | 0x80; - _ALTIMU.write(LPS25H_ADDR, dt, 1, true); - _ALTIMU.read(LPS25H_ADDR, dt, 3, false); - *press = dt[2] << 16 | dt[1] << 8 | dt[0]; - *press /= 4096; - *alt = (1-pow(*press / 1013.25, 0.190263))*44330.8; + char dt[3]; // 3 bytes for reading i2c data(Press_X_L Press_L Press_H, Temp_L Temp_H). + float t; // Store internal temperature sensor, for compesate altitude calculation. + + // Reading 3 bytes from pressure sensor. + recv(LPS25H_ADDR, 0x28, dt, 3); + // Put togheter three bytes of pressure and make a calculation to present it on hPa values. + *press = (double)((dt[2] << 16) | (dt[1] << 8) | dt[0])/4096.0; + // Reading 2 bytes of internal temperature sensor. + recv(LPS25H_ADDR, 0x2B, dt, 2); + // Put the two temperature data togheter. + t = dt[1] << 8 | dt[0]; + // Calculate temperature in celcius. + t = (t/480 + 42.5)/10; + // Calculate altitude value from pressure and temperature. + *alt = (1-pow((*press/1013.25), 0.190262525))*((t+273.15)/0.0065); } // I2C functions + + // Write a byte in a register address. bool Altimu::write_reg(int addr_i2c,int addr_reg, char v) { - char data[2] = {addr_reg, v}; + char data[2] = {addr_reg, v}; // + // return boolean value of write operation, if fails return 0, else 1. return Altimu::_ALTIMU.write(addr_i2c, data, 2) == 0; } - + // Read a byte from register bool Altimu::read_reg(int addr_i2c,int addr_reg, char *v) { char data = addr_reg; bool result = false; - + __disable_irq(); if ((_ALTIMU.write(addr_i2c, &data, 1) == 0) && (_ALTIMU.read(addr_i2c, &data, 1) == 0)){ *v = data;