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

Folks -
 

I'm a hardware person who is attempting to code on the 48SX.  I'm struggling with syntax here, if someone could help me out, that would be great.  I'm trying to copy a subroutine that would transmit a byte on my serial port, and I'm getting compile errors on the use of _PARAM1.  This is taken from an example code that Jon Williams wrote to read an A/D, the LTC1298. (Here is his code:  [url=http://forums.parallax.com/forums/attach.aspx?a=4270]http://forums.parallax.com/forums/attach.aspx?a=4270[/url]

 

(I'm trying to read an A/D as well, the LTC1864.  They are very similiar chips.)

 

Here is the sample code I'm copying right into my program:

'************************
' Use: TX_BYTE aByte
' -- transmits one byte to serial port

TX_BYTE:
  temp1 = __PARAM1                              ' copy outgoing byte
  SEROUT TX, Baud, temp1
  RETURN

'************************


 

I can see that the _PARAM1 is under the HELP files as a SX/B variable.  Why does my compiler freak out on my use of this seemingly straightforward subroutine?  It says "INVALID PARAMETER "_PARAM1".  I copied the definition of the subroutine:

TX_BYTE   SUB   1

 

I'm assuming that I will send it the byte that I want to have transmitted.  So what Jon calls "abyte" above is the what I want to have output from my circuit board to my PC's hyperterminal.  I'm calling the subroutine as follows:

TX_BYTE "H"

 

Sorry if this is super basic.  

 

~  Laura

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