The power AVR uses a finite state machine to decide when to charge and when the system is in a bad state. In standard operating mode, the system_state is given by three bits (eight states) Bit 2: BAT_OK Bit 1:Charge_OK Bit 0: Voltage_OK States 2, 6, or random bits in system state were used to indicate a logical error. When observed, another bit is set (FATAL_ERROR = Bit 3) and saved to non-volatile memory. The system will not operate normally until the AVR is reflashed. This condition was observed, possibly due to timing issues. States 2 & 6 now follow the semantics of states 3 & 7, which are non-fatal states. |
Hardware > The Critterbot Robot >