Rear Power Distribution Firmware

Quick Links:

• Hardware Project

Architecture:

• In terms of outputs, this board should also be pretty simple (slave, you tell it to turn on a specific board, instead of going to some fault mode, which implies a whole set of boards.)
• It can find out faults! DCDC, and AUX can be sources of faults. 

GPIO Outputs:

Expander 0x20:

• PB13_interrupt
• Solar Telemetry DSEL
• Cam Charger DSEL
• Spare DSEL
• Spare DSEL
• Rear Turn Light DSEL
• Rear Brake Light DSEL
• Strobe CTR BRK DSEL

Expander 0x21:

• PB14_interrupt
• solar_sense_en
• telemetry_en
• charger_en
• rear_camera_en
• bms_carrier_en
• motor_interface_en 

Expander 0x21:

• PB4_interrupt
• rear_light_turn
• rear_left_turn
• rear_light_brake
• rear_left_brake
• strobe_light
• centre_brake

Modules:

• rear_power_distribution_can
  • Receives can messages and raises events.
  • Receives events and sends can messages
• aux_dcdc_monitor
  
  • repeatedly reads the voltage and temp from aux and broadcasts the data, as well as fault if there's a fault.
• current_measurement
  • probably doesn't work  
  • uses 4 instances of the bts7200 to read currents
  • broadcasts the currents in a periodic loop
• output_driver
  • accepts REAR_POWER_OUTPUT_DRIVER_EVENT's 
  • drives the GPIO outputs using the bts 7200 chip.

Libraries

• MCP23008 Driver
  • initialize
  • set_gpio_states