===== Zephyr Basic Data Logging =====

[[hacks:zephyrproject|Zephyr Project @ VHS]]

==== Objective ====
Log data from all sensors on the board to csv file.

==== Steps ====

  - Setup Build Environment
  - Port sensor code to Zephyr
  - Write/modify code for data logging to file
  - Build code
  - Flash code to board
  - Test


==== Notes ====

=== HTS221: Capacitive digital sensor for relative humidity and temperature ===
  * Temperature (SENSOR_CHAN_TEMP, C)
  * Humidity (SENSOR_CHAN_HUMIDITY, mili-percent)
I2C
  * Read=10111111 (BFh)
  * Write=10111110 (BEh)

=== LIS3MDL: High-performance 3-axis magnetometer ===
  * Magnetometer  (SENSOR_CHAN_MAGN_X, SENSOR_CHAN_MAGN_Y, SENSOR_CHAN_MAGN_Z, SENSOR_CHAN_MAGN_XYZ)
I2C
  * Read= 00111101 (3Dh)
  * Write=00111100 (3Ch)

=== LSM6DSL: 3D accelerometer and 3D gyroscope ===
  * accelerometer (SENSOR_CHAN_ACCEL_X, SENSOR_CHAN_ACCEL_Y, SENSOR_CHAN_ACCEL_Z, SENSOR_CHAN_ACCEL_XYZ)
  * gyroscope (SENSOR_CHAN_GYRO_X, SENSOR_CHAN_GYRO_Y, SENSOR_CHAN_GYRO_Z, SENSOR_CHAN_GYRO_XYZ)
  * temperature (SENSOR_CHAN_TEMP - C)
I2C
  * Read= 11010101 (D5h)
  * Write=11010100 (D4h)

=== LPS22HB: 260-1260 hPa absolute digital output barometer ===
  * pressure(SENSOR_CHAN_PRESS - kPA)
  * temperature(SENSOR_CHAN_TEMP - C)
I2C
  * Read= 10111011 (BBh)
  * Write=10111010 (BAh)

=== VL53L0X: Time-of-Flight and gesture-detection sensor ===
  * Needs to be implemented
  * Datasheet: http://www.st.com/content/ccc/resource/technical/document/datasheet/group3/b2/1e/33/77/c6/92/47/6b/DM00279086/files/DM00279086.pdf/jcr:content/translations/en.DM00279086.pdf
  * VL53L0X Class for mbed OS: https://os.mbed.com/teams/ST/code/X_NUCLEO_53L0A1/docs/8d27ebb4e1eb/classVL53L0X.html
  * C++ for mbedOS: https://github.com/dbaba/vl53l0x-mbedos
  * ST Provided API: http://www.st.com/content/st_com/en/products/embedded-software/proximity-sensors-software/stsw-img005.html

I2C
  * Read=01010011(53h)
  * Write=01010010(52h)


====I2C ====
Table 3. I2C addresses for each module
|Modules Description |SAD[6:0] + R/W | I2C write address| I2C read address|
|HTS221 Capacitive digital sensor for relative humidity and temperature| 1011111x |0xBE| 0xBF|
|LIS3MDL 3-axis magnetometer | 0011110x | 0x3C |0x3D|
|LPS22HB MEMS nano pressure sensor| 1011101x |0xBA |0xBB|
|LSM6DSL 3D accelerometer and 3D gyroscope |1101010x |0xD4 |0xD5|
|VL53L0X Time-of-Flight ranging and gesture detection sensor| 0101001x| 0x52| 0x53|
|M24SR64-Y Dynamic NFC/RFID tag IC |1010110x |0xAC |0xAD|
|STSAFE-A100 -| 0100000x |0x40| 0x41|