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

I am learning about Interrupt on SX/B.  So I want a simple program. 
I have two LEDs.  The main program will blink one LED on & off.

When SX senses a keypress (on a RB pin), then I want the ISR to run (toggle a different LED).

 

I wrote the below code, but I must be missing some code (e.g. setting up RB port for interrupt, for setting high to low transition) etc.

 

Can someone please modify this program?  The purpose section has more details of what I want.

 

I also attach the file.  

 

' =========================================================================
'
'   File...... TEMPLATE.SXB
'   Purpose... to learn about external interrupt
'   Author....  
'   E-mail....  
'   Started...  5 Sept. 2008
'   Updated...
'
' =========================================================================


' -------------------------------------------------------------------------
' Program Description
' -------------------------------------------------------------------------

' there are two LEDs, a green LED on RB.5 and a red LED on RB.6
' and there is 1 input switch connected to RB.6
' the main program will blink green LED 1 sec. on and 1 sec. off continuously
' when user presses the input switch (falling edge), go into ISR
' in ISR, toggle the red LED and exit ISR


' -------------------------------------------------------------------------
' Device Settings
' -------------------------------------------------------------------------

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


' -------------------------------------------------------------------------
' IO Pins
' -------------------------------------------------------------------------

IntSource RB.4  INPUT
LED_Main RB.5 OUTPUT
LED_ISR RB.6 OUTPUT

' -------------------------------------------------------------------------
' Constants
' -------------------------------------------------------------------------


' -------------------------------------------------------------------------
' Variables
' -------------------------------------------------------------------------


' -------------------------------------------------------------------------
  INTERRUPT
' -------------------------------------------------------------------------

ISR_Start:
  ' ISR code here
    TOGGLE LED_ISR
ISR_Exit:
  RETURNINT ' {cycles}                                 


' =========================================================================
  PROGRAM Start
' =========================================================================

Pgm_ID:
  

' -------------------------------------------------------------------------
' Subroutines / Functions Declaration
' -------------------------------------------------------------------------


' -------------------------------------------------------------------------
' Program Code
' -------------------------------------------------------------------------

Start:
  ' initialization code here

Main:
  ' main code here
  HIGH LED_Main
  PAUSE 1000
  LOW LED_Main
  PAUSE 1000
  
  GOTO Main

 

' -------------------------------------------------------------------------
' Subroutines / Functions Listing
' -------------------------------------------------------------------------


' -------------------------------------------------------------------------
' User Data
' -------------------------------------------------------------------------

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


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