[Gambas-user] Serial Port issues and events.

[Alexie]

Do you have a better/working example? Using multiple serialport works fine
in Gambas (we use it in DomotiGa). You can read byte for byte, or read it
into an array (latter one i recommend). Then you just loop through the
array until you find STX/ETX characters ;-)

2016-06-30 12:17 GMT+02:00 zxMarce <d4t4full at ...626...>:

> Hi there. Using Gambas 3.8.4 from PPA on Ubuntu 14.04 x64.
>
> I'm having issues with serial ports. I have a USB to 4 RS232C hub adapter.
> It is working on a virtual Windows machine, reading and writing as it is
> supposed to do. The connected device (using one port only) is a Magnetic
> Card Encoder that uses binary data (i.e: not always printable ASCII) to be
> told what to do. Using the mobo's built-in RS232 port as well as a PCIe
> 4xRS232 card yield the same results, so the ports do not seem to be at
> fault
> here.
>
> My program tries to guess if the encoder is present at the specified port
> by
> sending the byte sequence 0x02-0xF8-0x31-0x03, which is an invalid command
> for the device. The device should respond with 0x02-0x15-0x03.
>
> All data comm blocks are surrounded by STX (0x02) and ETX (0x03) bytes.
>
> The problems I am having are two:
>
> 1- I can't have Gambas trigger the READ event for the port, thus I call it
> by hand.
> 2- I can't figure out how to get the data from the encoder into a string
> without missing bytes.
>
> My code is encapsulated in a class. Declarations:
>
>
>
> Instancing and setting the port up:
>
>
>
> Then, I send TEST_TX and expect for either TEST_RX or a timeout:
>
>
>
> Finally, this next is the problem code. It does not fire as expected when
> data arrives, and when I call it by hand in the IF above, if I try to READ
> #m_tty As String it chops off the leading 0x02 byte, and I could not figure
> out how to READ #m_tty As Byte[] or As Object (I get a null error; nothing
> on the message.error text, and no OK button on it either):
>
>
>
> A breakpoint in the "sgmnt = Read #m_tty As Object" line show that the
> value
> of "dLen" is three, which is OK. But when I try to READ As String, the
> leading 0x02 is missing from the string, leaving only 0x15-0x03. When this
> is later compared to TEST_RX in Test(), the comparison obviously fails.
>
> Hope someone can help me out. I guess my heavy VB6 background is
> interfering
> but can't really see how.
>
> TIA,
> zxMarce.
>
>
>
> --
> View this message in context:
> http://gambas.8142.n7.nabble.com/Serial-Port-issues-and-events-tp56614.html
> Sent from the gambas-user mailing list archive at Nabble.com.
>
>
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