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

I don't have access to my setup at the moment--I'd rather double check to give a better diagnosis of what works and what doesn't before I post the code (it's really, really long). 

 

However, I did notice something interesting going on in the assembly listing.

[code]
  1378  =00000019       LCD_TempStr   EQU  0x19          ;LCD_TempStr   Var     Word
  1379  =00000019       LCD_TempStr_LSB  EQU  LCD_TempStr
  1380  =0000001A       LCD_TempStr_MSB  EQU  LCD_TempStr+1
  1381                  
  1382  =0000002C       LCDVars       EQU  0x2C          ;LCDVars               Var     Byte(5)
  1383                  
  1384  =0000002C       LCD_Temp1     EQU  LCDVars+0     ;LCD_Temp1     Var     LCDVars(0)
  1385                  
  1386  =0000002D       LCD_TempHex   EQU  LCDVars+1     ;LCD_TempHex   Var     LCDVars(1)
  1387                  
  1388  =0000002E       LCD_TempHexChar  EQU  LCDVars+2  ;LCD_TempHexChar       Var     LCDVars(2)
  1389                  
  1390  =00000030       LCD_TempCharCnt  EQU  LCDVars+4  ;LCD_TempCharCnt       Var     LCDVars(4)
  1391                  
  1392  =0000002F       LCD_TempChar  EQU  LCDVars+3     ;LCD_TempChar  Var     LCDVars(3)
  1393                  
[/code]

The variable that was causing problems, LCD_TempCharCnt, happens to overflow to the next bank in the array. I'm not really sure how that'd mess up with indirect addressing, but it's something interesting to note. 

 

By the way, I'm running on an SX48.

 

 

here's the actual code that appears to be causing the problem. The problem that occurs is too consistent to describe without all of the code. It might have to do with the I2C bus commands somewhere, as putting pauses in certain places in the main code magically made everything work again (a whole lot slower, of course). Again, changing LCD_TempCharCnt to a global variable fixed everything in the code. Unfortunately, my SX-Key is a bit defective and won't debug anything (I'm doing an RMA after this project is done), so that makes things a bit more difficult to figure out. A lot of the functions require an actual I2C device to be connected, so I can't really do this in SXSim

 

[code]

' parameters: character (Byte), # of characters (Byte)

' LCD_I2Cxxxx commands are elsewhere in the code
LCD_DispChar:
 LCD_TempChar = __Param1
 If __ParamCnt = 1 then
  LCD_TempCharCnt = 1
 else
  LCD_TempCharCnt = __Param2
 endif
 LCD_I2CStart LCD_DataMode
 Do
  LCD_I2CSend LCD_TempChar
  LCD_TempCharCnt = LCD_TempCharCnt - 1
  if LCD_TempCharCnt = 0 then exit
 Loop
 LCD_I2CStop
 Return

[/code]

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