SWEN 340 Final Exam Topics

• State Machine advantages and overall design
• Identifying events and states in a system description
• A state is a condition that persists for a meaningful time
• An event is an action that may cause a state change
• Elevator state example: moving between floors
• Elevator event example: doors completed closing
• Using interrupts versus doing polling
• The meaning and usage of the volatile keyword
• Converting 12 bit ADC readings to values
• C Language bitwise operations including an 8 bit hardware register using |, ~, << , >> , and & bitwise operators.
• How to mask one or a few bits on an 8 bit register (setting the selected bits to 0 without altering the other bits)
• Example of masking:
• to mask bit 2
• uint32_t mask = ~( 1 << 2 ) ; // create a mask with just one bit set to 0
• *reg_ptr &= mask ; // now clear that one bit
• How to set one or a few bits on an 8 bit register without altering any other bits in that register

L. Kiser Dec. 5, 2024

Revised L. Kiser Dec 4, 2025