SPICA Software - Needs Work

Data Storage:

Onboard W25Q64 nonvolatile flash memory chip (https://www.winbond.com/resource-files/w25q64jv%20revj%2003272018%20plus.pdf)
32768 256 byte pages to work with
Need software to manage how flight data is stored
- multiple flights, record keeping, way of pulling data off of SPICA afterwards
low level access implemented here → https://github.com/nimaltd/w25qxx (make sure to leave the license in)

When do we arm the board after starting up?
- do we wait for a button?
  - might need to enable GPIO interrupts https://stackoverflow.com/questions/40057581/stm32f3-discovery-implement-gpio-interrupt
    - this can also be done in STM32Cube
- do we wait until the rocket is tipped up?
Do we always record data as fast as possible?
- low power mode for on the pad and landed?
When do we calibrate sensors? (e.g. the IMU)
What do we do when we land?
Testing modes
- deployment testing
- full simulation
- heartbeat check

Calculate heading, acceleration vector relative to heading, altitude, latitude, longitude
- kalman filter w/ altimeter and accelerometer
- try and determine accurate lat. long.
  - dead reckoning w/ IMU
  - filter with GPS data?
What do we send to the ground?
- Everything?
- Just raw sensor data?
- Interpreted data too?
Look for flight events
- boost phase
- coast phase
- apogee
  - kalman filter z-velocity = 0
  - nose over
- landing
- unsafe events
  - tip over at high velocity
  - any way to correct?
    - blow all chutes?