
Detailed Flowcharts
Appendix D
D14
Figure D.15
TXALLOC
Subroutine
TXALLOC
UART
in Use
?
Set IN-USE
Flag
RETURN
SLEEP
Wait at TXALWT
Until UART Is Free
Indivisible Zone
Common
• IN-USE Flag
•
TXAL
WT
: A Sleep V
ariable
No
Yes
11667
Figure D.16
TXFREE
Subroutine
TXFREE
Reset IN-USE
Flag
WAKEUP
Continue
Any
Process at
TXALWT
RETURN
Common
• IN-USE Flag
• TXALWT
: A Sleep V
ariable
11668
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