1. Madalina Vintila David Wilkinson Michelle Zhang Zac Greenawalt
Team 5 Software Design
Madalina Vintila
David Wilkinson
Michelle Zhang
Zac Greenawalt

2. Flowchart

3. Pseudo Code for the Pen
Initialization; While true { If pb flag set { Clear pb flag 2 channel conversion; Store sample in memory location Set data ready flag } else { if prev_press flag set { transmit end of character } } If data ready flag set { clear data ready flag Take sample from memory & add to buffer for transmitter Take battery count add to transmitter buffer Transmit (when buffer full) If CC > max value { add CC value to transmitter stack transmit

4. Subroutines Timer interrupt service subroutine (120Hz) {
If PB pressed { Set flag to do conversion
set previous press flag }
Else { clear previous press flag } }
CC interrupt {
Increment cc value++ }
Transmit subroutine {
Clear CC
Transmit buffer data

5. Flowchart

6. Pseudo Code for the Base
Initialization; While true { If receiver flag { clear receiver flag read from SPI; parse data check for end of character info – set flag if present else { store ATD into buffer } increment battery status variable with CC received } If end of character flag set { clear flag attempt character match with buffer data if match, display on LCD else display error mark (?) clear data stack

7. Subroutines CC interrupt { if discharging { Increment cc value++ }
else { Decrement cc value -- } }
Timer interrupt { update base & pen battery status on LCD }
Transceiver interrupt { set receiver flag }

8. Questions? Comments?