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Forum Index : Microcontroller and PC projects : COM on MMX 144 pin

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frederic
Newbie

Joined: 30/03/2018
Location: France
Posts: 15

Posted: 03:11pm 31 Mar 2018

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Hi everybody,
i am checking MMX144 on my own board....
i find problem with serial COM :
here is my little code :

debut:

open "COM2:4800" as #5
print #5,"hello"
close #5
pause 10

GoTo debut

nothing on TXpin except a little pulse (of course every 10mS)
i tried on COM1 and COM3, same problem, same little pulse,
i tried this code on another board MM+, and it is working well,
someone got this problem ?

fred

matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 10570

Posted: 03:27pm 31 Mar 2018

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The MMX uses different libraries to the MM+. You are closing the port before the transmit has happened and the MMX is doing exactly what you asked.

You can use the LOF function to test for transmit complete before you close the channel. This will return the size of the transmit buffer once it is empty

frederic
Newbie

Joined: 30/03/2018
Location: France
Posts: 15

Posted: 03:38pm 31 Mar 2018

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of course !!
a little head i have!!!
so quick
many thanks

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