Post by thread:[SX] Serial In/Out Timing

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Castrovinci wrote:

Hello, I am having issues with the timing of the serial in command. I am using visual basic to send a simple 1 or 2 depending on my outcome and the Sx chip needs to pick it up and go high. (nothing orginal here) but the problem I am having is that it works great for about 4 seconds and then it seems like it is timing out then works good again. Sometimes I have to send a serial command like 3 times for the stamp to pick it up. I am using an external osc. I am thinking that its resetting somehow? Watchdog timer or reset command? Here is the shabby program DEVICE SX28, OSCXT2, STACKX, OPTIONX,turbo FREQ 20_000_000 IRC_CAL IRC_FAST RX_BYTE FUNC 1, 0 sdata var byte sdata="0" 'pin Ra.3=INPUT SCHMITT PLP_A = %1111 plp_c=%11111111 ' pull up unused pins output rc PROGRAM Start start: goto main Main: 'TX_STR "Press a key: " sdata = RX_BYTE if sData = "1" then high rc.7 SEROUT RA.0, n2400, "A" endif if sdata= "2" then low rc.7 SEROUT RA.0, n2400, "B" endif GOTO Main '''''''''''''''''''''''''''''''''''''''''''''' FUNC RX_BYTE SERIN ra.3, n2400, __PARAM1 ' wait for byte ENDFUNC ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=371702 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2009 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:The problem may be in the VB code. Test your program with something generic like a terminal program -- you can do this with the bytes you're sending. Once you get the SX slave side happy and proved then you can move on to the VB stuff.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, PJ Allen wrote:

[ Just wanted to emphasize the 22K resistor on the SX/SERIN_pin. ] ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=371702#m371736 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2009 (http://www.dotNetBB.com)