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

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