LSM6DS33 Library
Dependents: teensyIMU LSM6DS33 ALTIMU_v6
Fork of LSM6DS3 by
LSM6DS33.cpp
- Committer:
- bclaus
- Date:
- 2016-10-06
- Revision:
- 4:4e7d663e26bd
- Parent:
- 3:b1d064895178
File content as of revision 4:4e7d663e26bd:
#include "LSM6DS33.h" LSM6DS33::LSM6DS33(PinName sda, PinName scl, uint8_t xgAddr) : i2c(sda, scl) { // xgAddress will store the 7-bit I2C address, if using I2C. xgAddress = xgAddr; } uint16_t LSM6DS33::begin(gyro_scale gScl, accel_scale aScl, gyro_odr gODR, accel_odr aODR) { // Store the given scales in class variables. These scale variables // are used throughout to calculate the actual g's, DPS,and Gs's. gScale = gScl; aScale = aScl; // Once we have the scale values, we can calculate the resolution // of each sensor. That's what these functions are for. One for each sensor calcgRes(); // Calculate DPS / ADC tick, stored in gRes variable calcaRes(); // Calculate g / ADC tick, stored in aRes variable // To verify communication, we can read from the WHO_AM_I register of // each device. Store those in a variable so we can return them. // The start of the addresses we want to read from char cmd[2] = { WHO_AM_I_REG, 0 }; // Write the address we are going to read from and don't end the transaction i2c.write(xgAddress, cmd, 1, true); // Read in all the 8 bits of data i2c.read(xgAddress, cmd+1, 1); uint8_t xgTest = cmd[1]; // Read the accel/gyro WHO_AM_I // Gyro initialization stuff: initGyro(); // This will "turn on" the gyro. Setting up interrupts, etc. setGyroODR(gODR); // Set the gyro output data rate and bandwidth. setGyroScale(gScale); // Set the gyro range // Accelerometer initialization stuff: initAccel(); // "Turn on" all axes of the accel. Set up interrupts, etc. setAccelODR(aODR); // Set the accel data rate. setAccelScale(aScale); // Set the accel range. //set high res timestamp where LSB is 25us cmd[0] = WAKE_UP_DUR; cmd[1] = 0x10; i2c.write(xgAddress, cmd, 2); // Once everything is initialized, return the WHO_AM_I registers we read: return xgTest; } void LSM6DS33::initGyro() { char cmd[2] = { CTRL2_G, gScale | G_ODR_104 }; // Write the data to the gyro control registers i2c.write(xgAddress, cmd, 2); } void LSM6DS33::initAccel() { char cmd[4] = { CTRL1_XL, 0x30}; // Write the data to the accel control registers i2c.write(xgAddress, cmd, 2); } void LSM6DS33::initIntr() { } void LSM6DS33::readAll(){ // The data we are going to read from the temp/gyr/acc/timestamp //char data[14];//from 0x20 to 0x42 char data[14]; char tsdata[3]; i2c.start(); i2c.write(xgAddress); i2c.write(OUT_TEMP_L); i2c.start(); i2c.write(xgAddress | 0x1); for(int i =0;i<13;i++){ data[i]=i2c.read(1); } data[13]=i2c.read(0); i2c.stop(); // Temperature is a 12-bit signed integer temperature_raw = data[0] | (data[1] << 8); gx_raw = data[2] | (data[3] << 8); gy_raw = data[4] | (data[5] << 8); gz_raw = data[6] | (data[7] << 8); ax_raw = data[8] | (data[9] << 8); ay_raw = data[10] | (data[11] << 8); az_raw = data[12] | (data[13] << 8); i2c.start(); i2c.write(xgAddress); i2c.write(TIMESTAMP0_REG); i2c.start(); i2c.write(xgAddress | 0x1); for(int i =0;i<3;i++){ tsdata[i]=i2c.read(1); } tsdata[3]=i2c.read(0); i2c.stop(); time_raw = tsdata[0] | (tsdata[1] << 8) | (tsdata[2] << 16); temperature_c = (float)temperature_raw / 16.0 + 25.0; gx = gx_raw * gRes; gy = gy_raw * gRes; gz = gz_raw * gRes; ax = ax_raw * aRes; ay = ay_raw * aRes; az = az_raw * aRes; time = time_raw*(0.000025); } void LSM6DS33::readAccel() { // The data we are going to read from the accel char data[6]; // Set addresses char subAddressXL = OUTX_L_XL; char subAddressXH = OUTX_H_XL; char subAddressYL = OUTY_L_XL; char subAddressYH = OUTY_H_XL; char subAddressZL = OUTZ_L_XL; char subAddressZH = OUTZ_H_XL; // Write the address we are going to read from and don't end the transaction i2c.write(xgAddress, &subAddressXL, 1, true); // Read in register containing the axes data and alocated to the correct index i2c.read(xgAddress, data, 1); i2c.write(xgAddress, &subAddressXH, 1, true); i2c.read(xgAddress, (data + 1), 1); i2c.write(xgAddress, &subAddressYL, 1, true); i2c.read(xgAddress, (data + 2), 1); i2c.write(xgAddress, &subAddressYH, 1, true); i2c.read(xgAddress, (data + 3), 1); i2c.write(xgAddress, &subAddressZL, 1, true); i2c.read(xgAddress, (data + 4), 1); i2c.write(xgAddress, &subAddressZH, 1, true); i2c.read(xgAddress, (data + 5), 1); // Reassemble the data and convert to g ax_raw = data[0] | (data[1] << 8); ay_raw = data[2] | (data[3] << 8); az_raw = data[4] | (data[5] << 8); ax = ax_raw * aRes; ay = ay_raw * aRes; az = az_raw * aRes; } void LSM6DS33::readIntr() { char data[1]; char subAddress = TAP_SRC; i2c.write(xgAddress, &subAddress, 1, true); i2c.read(xgAddress, data, 1); intr = (float)data[0]; } void LSM6DS33::readTemp() { // The data we are going to read from the temp char data[2]; // Set addresses char subAddressL = OUT_TEMP_L; char subAddressH = OUT_TEMP_H; // Write the address we are going to read from and don't end the transaction i2c.write(xgAddress, &subAddressL, 1, true); // Read in register containing the temperature data and alocated to the correct index i2c.read(xgAddress, data, 1); i2c.write(xgAddress, &subAddressH, 1, true); i2c.read(xgAddress, (data + 1), 1); // Temperature is a 12-bit signed integer temperature_raw = data[0] | (data[1] << 8); temperature_c = (float)temperature_raw / 16.0 + 25.0; temperature_f = temperature_c * 1.8 + 32.0; } void LSM6DS33::readGyro() { // The data we are going to read from the gyro char data[6]; // Set addresses char subAddressXL = OUTX_L_G; char subAddressXH = OUTX_H_G; char subAddressYL = OUTY_L_G; char subAddressYH = OUTY_H_G; char subAddressZL = OUTZ_L_G; char subAddressZH = OUTZ_H_G; // Write the address we are going to read from and don't end the transaction i2c.write(xgAddress, &subAddressXL, 1, true); // Read in register containing the axes data and alocated to the correct index i2c.read(xgAddress, data, 1); i2c.write(xgAddress, &subAddressXH, 1, true); i2c.read(xgAddress, (data + 1), 1); i2c.write(xgAddress, &subAddressYL, 1, true); i2c.read(xgAddress, (data + 2), 1); i2c.write(xgAddress, &subAddressYH, 1, true); i2c.read(xgAddress, (data + 3), 1); i2c.write(xgAddress, &subAddressZL, 1, true); i2c.read(xgAddress, (data + 4), 1); i2c.write(xgAddress, &subAddressZH, 1, true); i2c.read(xgAddress, (data + 5), 1); // Reassemble the data and convert to degrees/sec gx_raw = data[0] | (data[1] << 8); gy_raw = data[2] | (data[3] << 8); gz_raw = data[4] | (data[5] << 8); gx = gx_raw * gRes; gy = gy_raw * gRes; gz = gz_raw * gRes; } void LSM6DS33::setGyroScale(gyro_scale gScl) { // The start of the addresses we want to read from char cmd[2] = { CTRL2_G, 0 }; // Write the address we are going to read from and don't end the transaction i2c.write(xgAddress, cmd, 1, true); // Read in all the 8 bits of data i2c.read(xgAddress, cmd+1, 1); // Then mask out the gyro scale bits: cmd[1] &= 0xFF^(0x3 << 3); // Then shift in our new scale bits: cmd[1] |= gScl << 3; // Write the gyroscale out to the gyro i2c.write(xgAddress, cmd, 2); // We've updated the sensor, but we also need to update our class variables // First update gScale: gScale = gScl; // Then calculate a new gRes, which relies on gScale being set correctly: calcgRes(); } void LSM6DS33::setAccelScale(accel_scale aScl) { // The start of the addresses we want to read from char cmd[2] = { CTRL1_XL, 0 }; // Write the address we are going to read from and don't end the transaction i2c.write(xgAddress, cmd, 1, true); // Read in all the 8 bits of data i2c.read(xgAddress, cmd+1, 1); // Then mask out the accel scale bits: cmd[1] &= 0xFF^(0x3 << 3); // Then shift in our new scale bits: cmd[1] |= aScl << 3; // Write the accelscale out to the accel i2c.write(xgAddress, cmd, 2); // We've updated the sensor, but we also need to update our class variables // First update aScale: aScale = aScl; // Then calculate a new aRes, which relies on aScale being set correctly: calcaRes(); } void LSM6DS33::setGyroODR(gyro_odr gRate) { // The start of the addresses we want to read from char cmd[2] = { CTRL2_G, 0 }; // Set low power based on ODR, else keep sensor on high performance if(gRate == G_ODR_13_BW_0 | gRate == G_ODR_26_BW_2 | gRate == G_ODR_52_BW_16) { char cmdLow[2] ={ CTRL7_G, 1 }; i2c.write(xgAddress, cmdLow, 2); } else { char cmdLow[2] ={ CTRL7_G, 0 }; i2c.write(xgAddress, cmdLow, 2); } // Write the address we are going to read from and don't end the transaction i2c.write(xgAddress, cmd, 1, true); // Read in all the 8 bits of data i2c.read(xgAddress, cmd+1, 1); // Then mask out the gyro odr bits: cmd[1] &= (0x3 << 3); // Then shift in our new odr bits: cmd[1] |= gRate; // Write the gyroodr out to the gyro i2c.write(xgAddress, cmd, 2); } void LSM6DS33::setAccelODR(accel_odr aRate) { // The start of the addresses we want to read from char cmd[2] = { CTRL1_XL, 0 }; // Set low power based on ODR, else keep sensor on high performance if(aRate == A_ODR_13 | aRate == A_ODR_26 | aRate == A_ODR_52) { char cmdLow[2] ={ CTRL6_C, 1 }; i2c.write(xgAddress, cmdLow, 2); } else { char cmdLow[2] ={ CTRL6_C, 0 }; i2c.write(xgAddress, cmdLow, 2); } // Write the address we are going to read from and don't end the transaction i2c.write(xgAddress, cmd, 1, true); // Read in all the 8 bits of data i2c.read(xgAddress, cmd+1, 1); // Then mask out the accel odr bits: cmd[1] &= 0xFF^(0x7 << 5); // Then shift in our new odr bits: cmd[1] |= aRate << 5; // Write the accelodr out to the accel i2c.write(xgAddress, cmd, 2); } void LSM6DS33::calcgRes() { // Possible gyro scales (and their register bit settings) are: // 245 DPS (00), 500 DPS (01), 2000 DPS (10). switch (gScale) { case G_SCALE_245DPS: gRes = 245.0 / 32768.0; break; case G_SCALE_500DPS: gRes = 500.0 / 32768.0; break; case G_SCALE_2000DPS: gRes = 2000.0 / 32768.0; break; } } void LSM6DS33::calcaRes() { // Possible accelerometer scales (and their register bit settings) are: // 2 g (000), 4g (001), 6g (010) 8g (011), 16g (100). switch (aScale) { case A_SCALE_2G: aRes = 2.0 / 32768.0; break; case A_SCALE_4G: aRes = 4.0 / 32768.0; break; case A_SCALE_8G: aRes = 8.0 / 32768.0; break; case A_SCALE_16G: aRes = 16.0 / 32768.0; break; } }