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

Okay I'm missing something vital here... I thought that if a task took longer than 1 tick the interrupt would keep track of that and adjust the next task.
 

Why won't something like this work ? I don't see what all the "context switching" is doing...

 



[code]
  

DEVICE SX28, OSC4MHZ, TURBO, OPTIONX, STACKX
FREQ 4_000_000 

LED1    PIN RC.0 OUTPUT
LED2    PIN RC.1 OUTPUT
LED3    PIN RC.2 OUTPUT
LED4    PIN RC.3 OUTPUT 


cnt           VAR Byte
task_ID       VAR BYTE (4)
task_Interval VAR BYTE (4)
task_Count    VAR BYTE (4) 

  

INTERRUPT 100
  GOTO HandleInt 

  

TASK1   SUB 0
TASK2   SUB 0
TASK3   SUB 0
TASK4   SUB 0 

  

HandleInt:
  FOR cnt = 0 TO 3
    DEC task_Count(cnt)
    IF task_Count(cnt) = 0 THEN
      ON cnt GOSUB TASK1, TASK2, TASK3, TASK4
      task_Count(cnt) = task_Interval(cnt)
    ENDIF
  NEXT
RETURNINT 


  

  

PROGRAM Start 


  

  

Start:
  PUT TASK_ID, 0, 1, 2, 3
  PUT TASK_INTERVAL, 10, 50, 75, 100
  PUT TASK_COUNT, 1, 1, 1, 1 

  ' Main code here, do whatever...
END 


Task1:
  LED1 = ~LED1
  RETURN 


Task2:
  LED2 = ~LED2
  RETURN 


Task3:
  LED3 = ~LED3
  RETURN 


Task4:
  LED4 = ~LED4
  RETURN 


  
[/code]

 

Bean

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