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edwin marcellin
edwin marcellin
Associate II
April 17, 2018
Question

RS232 Communication

  • April 17, 2018
  • 1 reply
  • 2607 views
Posted on April 17, 2018 at 16:53

Hello,

I have a STEVAL-FKI868V1 based on a Nucleo L152RE board and i would like to connect a RS232 to my RX pin to get the information and then send it when i click on the button.

So my main problem is about the code to developp to get the information from the RX.

Is someone could help me, please.

Thx

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    1 reply

    Tesla DeLorean
    Tesla DeLorean
    Guru
    April 17, 2018
    Posted on April 17, 2018 at 17:25

    RS232 specifically, using a level converter like a MAX3232? Or serial communications using a USART more generally?

    The Nucleo board provides for a VCP (Virtual Serial Port) connection to the PC via the ST-LINK, one can open this up in a Terminal application in Windows/Linux

    The Cube L1 libraries should have assorted examples for USART connectivity.

    http://www.st.com/en/embedded-software/stm32cubel1.html

     

    >>So my main problem is about the code to develop to get the information from the RX. Is someone could help me, please.

    Sounds like a school or work assignment, generally you're expect to do that work yourself.

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    edwin marcellin
    edwin marcellinAuthor
    Associate II
    April 17, 2018
    Posted on April 17, 2018 at 17:44

    Thank you.

    No i have a module from Precla Molen that communicate in RS232. So i will do in USART. 

    >>Sounds like a school or work assignment, generally you're expect to do that work yourself.

    Yes usually but i have to do a quick proof of concept without spending that much time just to get information from sensors... I wanted to test this technology that i do not know.

    I also have a pb IAR. I can only connect my device once. After that i have to delete everything and install it again, because i cannot rebuilt all.

    Tesla DeLorean
    Tesla DeLorean
    Guru
    April 18, 2018
    Posted on April 18, 2018 at 22:56

    The micro-controller will not accept RS232 level directly, you will need to interface to one of the available USART using a MAX3232 type device to convert the levels.

    http://www.ti.com/lit/ds/symlink/max3232.pdf

     
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