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example is_key_pressed #185

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example is_key_pressed #185

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23 changes: 23 additions & 0 deletions cpctelera/src/keyboard/cpct_isKeyPressed.s
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Original file line number Diff line number Diff line change
Expand Up @@ -73,6 +73,29 @@
;; -------------------------------------------
;; Any | 17 | 68
;; -------------------------------------------
;;
;; Example of use of cpct_isKeyPressed_asm
;;
;; We want that the player pushes the [Space Key]. So,
;; let's make a routine that waits until this key is pressed
;;wait_until_space_key_is_pressed::
;; scan all the keyboard reading every key and notates
;; call cpct_scanKeyboard_asm
;; load the desired key in the register HL
;; ld hl,#Key_Space
;; call the routine to check if the key is pressed
;;
;; return in flag Z the result of the check.
;; 1 if key is NOT pressed, 0 if pressed
;; call cpct_isKeyPressed_asm
;;
;; check against Zero in flag Z
;;
;; flag is 1, so key is not pressed
;; jr nz,wait_until_space_key_is_pressed
;; key was pressed, flag was 0.end of routine
;; ret
;;
;; (end code)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

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