Post by thread:[SX] SX/B Help - Passing string to a subroutine

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, johncouture wrote:I'm trying to display a string using a subroutine. Something like the following. Complete code in attachment. The problem is that I can't seem to be able to pass the string name as a parameter. When I hardcode the string name in the subroutine, it works ok. Thus, it must be some kind of syntax error that I'm introducing that is preventing the passing of the string address. There's something about that __PARAM1 and the @ symbol that I am not understanding. DISPLAY SUB 1 Msg1: Data "This is a string",0 Msg2: Data "Another string ",0 start:

DISPLAY Msg1 PAUSE 255 DISPLAY Msg2 PAUSE 255 goto start '------------------ ' page 1 subroutine section '------------------ DISPLAY: dpos = 0 goto disp6 disp5: dcol = 64 goto disp7 disp6: dcol = 0 disp7: POSCUR dcol read __PARAM1+dpos,dbyte if dbyte=0 then disp9 LCDOUT dbyte dcol = dcol + 1 dpos = dpos + 1 if dcol = 72 then disp6 if dcol = 8 then disp5 goto disp7 disp9: return ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=86956 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2005 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Jon Williams wrote:Have you downloaded the latest version of SX/B? If not, please do and then look in the examples for READ. One of the improvements made is the handling of strings and with 1.42 you can pass the name of a string (z-string stored in a DATA table) or pass as string directly.

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, johncouture wrote:Jon, Thank you! I'm working on it now. My apologies for not downloading the 1.42 version earlier. Good example in the attachment.

Now that's dedication! You answered the email at 3:44am! Are you on the East Coast or something? (grin) ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=86956#m87018 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2005 (http://www.dotNetBB.com)

In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Jon Williams wrote:Central Time Zone (Dallas, TX). Funny, I don't remember getting up that early, but yesteday was a big movie day (my other love), so I may have....

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, johncouture wrote:Jon, In the READ2.SXB listing above, the TX_STR subroutine: ------------------------------------------------------- 1) The comments above TX_STR show a usage of up to THREE parameters (one of them is an either or param), yet the subroutine assigns PARAM1 through PARAM4 to variables. What happened to the fourth parameter in the USE documentation? ------------------------------------------------------- 2) You use a "C" and a "Z" which seem to be aliases (ref online manual under "SX/B Aliases, SX Registers") C = Carry (Status.0) Z = Zero (Status.2) If one assumes that PARAM2 is the count (as in how many characters to send out), then I don't understand the adding of a bit to this variable. Can you explain this one further. (Ref: line 150 and line 160) ------------------------------------------------------- 3) It seems that if you are sending a string to a subroutine, the subroutine has to assign PARAM1 and PARAM2 to SOMETHING even if you want the subroutine to send the entire string. Am I correct? ------------------------------------------------------- 4) (grin) If you rewrite this example, would it be easier to read if you used stemp1=param1, stemp2=param2 etc instead of temp3=param1, temp4=param2, if it is a full moon temp5=Mickey Mantle, temp6=the catcher .... Who's on first base again? This SX sure is a fun chip! Thank you for all of the info that you make available to us.

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

1) Strings count as two parameters: base and offset (this is mentioned in the help file toward the end of READ; the section concerning strings) 2) __PARAM1 is the offset, __PARAM2 is the base -- the address is sent "Little Endian" (low byte, high byte) 3) Yes, again, strings take two parameters (which point to the starting location in memory of the string) 4) It works now ... why rewrite it? (other than simplifying to eliminate substrings) ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=86956#m87059 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2005 (http://www.dotNetBB.com)