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

Mike,

As you figured out, your code is redundant (always sending four bytes) so you could create a subroutine like this:

Update_Display:
  temp1 = __PARAM1
  temp2 = __PARAM2
  temp3 = __PARAM3
  temp4 = __PARAM4

  I2CSTART SDA, TopSlave
  I2CSEND SDA, $60
  I2CSEND SDA, temp1
  I2CSEND SDA, temp2
  I2CSEND SDA, temp3
  I2CSEND SDA, temp4
  I2CSTOP
  RETURN

Of course, you'd have to define this at the top of the program like this:

Update_Display    SUB     4

... and then -- here's the cool part -- you can call it from your program like this:

  Update_Display $00, $01, $00, $01

This will be easier to code, and save a lot of space as you're expanding fewer I2CSEND instructions.

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