Complex SERIN instructions
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If I do a lot of math in inputData arguments, will SerIn miss any data
that was being sent to the stamp while the math was being carried out?
Say for example that I have this line in my program..
serin 0, 6, [noparse][[/noparse]wait ("Hi"), skip sin(10/5+2-b9*w1), b0, wait ("Bye")]
or something similar... i'm not doing that but it IS a legal
instruction...
basicly, doing too much math inside of serin would block the serin
instruction from continuing to parse any input... am I correct?
btw, this is not a problem that im having and an stuck on.. but rather a
question that i find intriguing
-John
that was being sent to the stamp while the math was being carried out?
Say for example that I have this line in my program..
serin 0, 6, [noparse][[/noparse]wait ("Hi"), skip sin(10/5+2-b9*w1), b0, wait ("Bye")]
or something similar... i'm not doing that but it IS a legal
instruction...
basicly, doing too much math inside of serin would block the serin
instruction from continuing to parse any input... am I correct?
btw, this is not a problem that im having and an stuck on.. but rather a
question that i find intriguing
-John
Comments
>that was being sent to the stamp while the math was being carried out?
>
>Say for example that I have this line in my program..
>
>serin 0, 6, [noparse][[/noparse]wait ("Hi"), skip sin(10/5+2-b9*w1), b0, wait ("Bye")]
>
>or something similar... i'm not doing that but it IS a legal
>instruction...
>basicly, doing too much math inside of serin would block the serin
>instruction from continuing to parse any input... am I correct?
>
>btw, this is not a problem that im having and an stuck on.. but rather a
>question that i find intriguing
>
>-John
Hi John,
Yes, the calculation would add nearly a millisecond before the Stamp
figures out how many characters to skip. If the next character's
start bit arrives before that, it will be missed and the whole string
will get out of sync. The same thing is true of some of the modifiers
like DEC and STR. There is a setup time that is around 0.5
millisecond to set it up before the Stamp is ready to receive the
start bit. (The '2sx and '2p are faster)
If the other device paces the characters it sends, say, by 1
millisecond each, then there is not a problem even at high baud
rates. In general the BS2 has trouble receiving head to heal
characters at 9600 baud and above. At 300 baud though, there is over
3 milliseconds for each stop bit, so, no problem.
More timing info at <http://www.emesys.com/BS2rs232.htm#sertime>
-- Tracy