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

Howdy...
 

Is it possible to use a pin as a variable ?

Right now I have eight pins defined as following:


[code]
CanRX1 PIN RC.7 input 'CAN Receive to MCP2515 PIN 15 SO 
CanTX1 PIN RC.6 output 'CAN Transmit to MCP2515 PIN 14 SI 
PINcs1 PIN RC.5 output 'CAN Chip Select to MCP2515 PIN 16 CS 
PINclk1 PIN RC.4 output 'CAN Clock to MCP2515 PIN 13 SCK 
CanRX2 PIN RB.7 input 'CAN Receive to MCP2515 PIN 15 SO 
CanTX2 PIN RB.6 output 'CAN Transmit to MCP2515 PIN 14 SI 
PINcs2 PIN RB.5 output 'CAN Chip Select to MCP2515 PIN 16 CS 
PINclk2 PIN RB.4 output 'CAN Clock to MCP2515 PIN 13 SCK 

These pins represent chip 1 and chip 2 of the same type chip.

 


And then two subroutines using these pins.



[code]
resetCan1: 
LOW PINcs1 
SHIFTOUT CANTX1, PINclk1, MSBFIRST, $C0 'Send a RESET command 
HIGH PINcs1 
return 
resetCan2: 
LOW PINcs2 
SHIFTOUT CANTX2, PINclk2, MSBFIRST, $C0 'Send a RESET command 
HIGH PINcs2 
return 
[/code]
Now every time I add a subroutine, I have to add two of them, one for chip 1 and one for chip 2.
 

What I want to do is to to use one routine and pass a variable 1 or 2 depending on which chip I want to access.

For two chips it might be easier to just do an if statement and then select either SHIFTOUT command. However I probably want to add more chips and I wonder if it is possible to do something like this.

 



[code]
CanRX1 PIN RC.7 input 'CAN Receive to MCP2515 PIN 15 SO 
CanTX1 PIN RC.6 output 'CAN Transmit to MCP2515 PIN 14 SI 
PINcs1 PIN RC.5 output 'CAN Chip Select to MCP2515 PIN 16 CS 
PINclk1 PIN RC.4 output 'CAN Clock to MCP2515 PIN 13 SCK 
CanRX2 PIN RC.3 input 'CAN Receive to MCP2515 PIN 15 SO 
CanTX2 PIN RC.2 output 'CAN Transmit to MCP2515 PIN 14 SI 
PINcs2 PIN RC.1 output 'CAN Chip Select to MCP2515 PIN 16 CS 
PINclk2 PIN RC.0 output 'CAN Clock to MCP2515 PIN 13 SCK 
CanRX3 PIN RB.7 input 'CAN Receive to MCP2515 PIN 15 SO 
CanTX3 PIN RB.6 output 'CAN Transmit to MCP2515 PIN 14 SI 
PINcs3 PIN RB.5 output 'CAN Chip Select to MCP2515 PIN 16 CS 
PINclk3 PIN RB.4 output 'CAN Clock to MCP2515 PIN 13 SCK 
CanRX4 PIN RB.3 input 'CAN Receive to MCP2515 PIN 15 SO 
CanTX4 PIN RB.2 output 'CAN Transmit to MCP2515 PIN 14 SI 
PINcs4 PIN RB.1 output 'CAN Chip Select to MCP2515 PIN 16 CS 
PINclk4 PIN RB.0 output 'CAN Clock to MCP2515 PIN 13 SCK 

  

CanRX         PIN RB.3 input    'CAN Receive      to MCP2515 PIN 15  SO
CanTX         PIN RB.2 output   'CAN Transmit     to MCP2515 PIN 14  SI
PINcs         PIN RB.1 output   'CAN Chip Select  to MCP2515 PIN 16  CS
PINclk        PIN RB.0 output   'CAN Clock        to MCP2515 PIN 13  SCK
 

. 

. 

. 

resetCan:
 chip = __PARAM1
 if chip = 1 then
  PINcs = PINcs1
  CANTX = CANTX1
  PINclk = PINclk1
 elseif chip = 2 then
  PINcs = PINcs2
  CANTX = CANTX2
  PINclk = PINclk2
 elseif chip = 3 then
  PINcs = PINcs3
  CANTX = CANTX3
  PINclk = PINclk3
 elseif chip = 4 then
  PINcs = PINcs4
  CANTX = CANTX4
  PINclk = PINclk4
 endif 

  LOW PINcs
  SHIFTOUT CANTX, PINclk, MSBFIRST, $C0   'Send a RESET command
  HIGH PINcs
 return 
[/code]

I tried this and the defined pins will not chage.

 

Is this possible ???

Any other suggestions ???

---------- End of Message ----------


You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=142595

Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com

The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2006 (http://www.dotNetBB.com)