84PCE:Ports:A000 - Revision history

Calc84maniac: /* Registers */ Document mask register

2024-09-21T18:02:40Z

‎Registers: Document mask register

2018-01-02T04:49:34Z

‎Registers

2015-04-30T05:41:31Z

‎Scanning the Keypad

2015-04-29T20:05:20Z

‎Scanning the Keypad

2015-04-29T20:03:04Z

‎Scanning the Keypad

2015-04-29T20:02:51Z

‎Scanning the Keypad

2015-04-02T15:28:30Z

‎Using the keypad

2015-04-02T15:24:47Z

‎Reset the Keypad

2015-04-02T15:24:25Z

‎Example

2015-04-02T06:58:34Z

‎Using the keypad: The ON key isn't part of the main keypad

@@ Line 13: / Line 13: @@
 ** Bits 0-1: Scan mode
 *** Mode 0: Idle.
-*** Mode 1: Indiscriminate key detection. Data registers are invalid, but whenever any key is pressed, interrupt bit 2 is set (and cannot be cleared until the key is released).
+*** Mode 1: Indiscriminate key detection. Data registers of all enabled rows are set to the bitwise OR of those rows, and whenever any key is pressed, interrupt bit 2 is set (and cannot be cleared until the key is released).
 *** Mode 2: Single scan. The keypad is scanned once, and then the mode returns to 0.
 *** Mode 3: Continuous scan. When scanning completes, it just starts over again after a delay.
@@ Line 22: / Line 22: @@
 ** Bits 0-7: Number of rows to read (later rows are not updated in F50010-F5002F, and just read as whatever they were before being disabled)
 ** Bits 8-15: Number of columns to read (later column bits in a row are set to 0 when it is updated)
 * F50008 (R/W): Keypad interrupt status/acknowledge (3-bit). Write "1" bits to acknowledge.
 ** Bit 0: Keypad scan complete

@@ Line 16: / Line 16: @@
 *** Mode 2: Single scan. The keypad is scanned once, and then the mode returns to 0.
 *** Mode 3: Continuous scan. When scanning completes, it just starts over again after a delay.
-** Bits 2-15: Number of APB cycles to wait before scanning each row (default value is 03C0h; bits 2-7 are 0 so the mode can be written directly to F50000)
+** Bits 2-15: Number of APB (6MHz) cycles to wait before scanning each row (default value is 03C0h; bits 2-7 are 0 so the mode can be written directly to F50000)
-** Bits 16-31: Number of APB cycles to wait between scans (default value is 0F00h)
+** Bits 16-31: Number of APB (6MHz) cycles to wait between scans (default value is 0F00h)
 * F50004 (R/W):

← Older revision		Revision as of 05:41, 30 April 2015
Line 155:		Line 155:
	; Read data registers here as needed		; Read data registers here as needed

−	~~ei ; Enable OS interrupts</nowiki>~~
−
−	~~Also, an easier way to scan the keypad is just to set it into continous reading mode and then read the registers from there:~~
−	~~<nowiki> di ; Disable OS interrupts~~
−	~~_loop:~~
−	~~ld hl,0F50000h~~
−	~~ld (hl),3 ; Set Continous Scan mode~~
−
−	~~; Read data registers here as needed~~
−
−	~~jr _loop~~
	ei ; Enable OS interrupts</nowiki>		ei ; Enable OS interrupts</nowiki>

@@ Line 159: / Line 159: @@
 Also, an easier way to scan the keypad is just to set it into continous reading mode and then read the registers from there:
   <nowiki> di             ; Disable OS interrupts
   ld hl,0F50000h
   ld (hl),3      ; Set Continous Scan mode
@@ Line 164: / Line 165: @@
   ; Read data registers here as needed
   ei             ; Enable OS interrupts</nowiki>

@@ Line 164: / Line 164: @@
   ; Read data registers here as needed
-  ei             ; Enable OS interrupts</nowiki
+  ei             ; Enable OS interrupts</nowiki>
 It is generally a good idea to reset the keypad controller back before exiting your program, in case you have modified timings and such.

@@ Line 156: / Line 156: @@
   ei             ; Enable OS interrupts</nowiki>
 It is generally a good idea to reset the keypad controller back before exiting your program, in case you have modified timings and such.
 === Reset the Keypad ===
   <nowiki>RestoreKeyboard:

@@ Line 127: / Line 127: @@
 | bgcolor=lightgray |
 |}
 The controller works by scanning multiple rows into data registers; rather than manually selecting rows like previous versions.

← Older revision		Revision as of 15:24, 2 April 2015
Line 154:		Line 154:

	ei ; Enable OS interrupts</nowiki>		ei ; Enable OS interrupts</nowiki>
		+
		+	It is generally a good idea to reset the keypad controller back before exiting your program, in case you have modified timings and such.
		+	=== Reset the Keypad ===
		+	<nowiki> RestoreKeyboard:
		+	ld hl,0F50000h
		+	xor a ; Mode 0
		+	ld (hl),a
		+	inc l ; 0F50001h
		+	ld (hl),15 ; Wait 15*256 APB cycles before scanning each row
		+	inc l ; 0F50002h
		+	xor a
		+	ld (hl),a
		+	inc l ; 0F50003h
		+	ld (hl),15 ; Wait 15 APB cycles before each scan
		+	inc l ; 0F50004h
		+	ld a,8 ; Number of rows to scan
		+	ld (hl),a
		+	inc l ; 0F50005h
		+	ld (hl),a ; Number of columns to scan
		+	ret</nowiki>

@@ Line 68: / Line 68: @@
 |-
 | F50014
-| on
+| bgcolor=lightgray |
 | sto
 | ln