R32V2020 Pushbutton Switches

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Revision as of 12:48, 10 April 2022 by Blwikiadmin (talk | contribs) (Created page with "=== Sample Code === * d0-d2 are the pushbutton switches (inverted) ** Pushbutton switches are debounced * d3-10 are the DIP switches (not inverted and not debounced) <pre> ;...")
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Sample Code

  • d0-d2 are the pushbutton switches (inverted)
    • Pushbutton switches are debounced
  • d3-10 are the DIP switches (not inverted and not debounced)
;
; readSws
; switches value returned in r8
; switches are high when pressed
; Switches d0-d2 are the pushbutton switches (inverted)
; 	Pushbutton switches are debounced
; Switches d3-10 are the DIP switches (not inverted and not debounced)
;

readSws:
	push	PAR
	push	r9
	lix		r9,0x7
	lix		PAR,0x2000	; Switches address
	lpl		r8			; Read switches into r9
	xor		r8,r8,r9
	pull	r9
	pull	PAR
	pull	PC
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