157 lines
4.1 KiB
C
157 lines
4.1 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2002 by Daniel Stenberg
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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/*
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* Archos Jukebox Recorder button functions
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*/
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#include "config.h"
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#ifdef HAVE_RECORDER_KEYPAD
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#include "types.h"
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#include "sh7034.h"
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#include "button.h"
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/* AJBR buttons are connected to the CPU as follows:
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*
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* ON and OFF are connected to separate port B input pins.
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*
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* F1, F2, F3, and UP are connected to the AN4 analog input, each through
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* a separate voltage divider. The voltage on AN4 depends on which button
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* (or none, or a combination) is pressed.
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*
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* DOWN, PLAY, LEFT, and RIGHT are likewise connected to AN5. */
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/* Button voltage levels on AN4 and AN5 */
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#define LEVEL1 50
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#define LEVEL2 125
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#define LEVEL3 175
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#define LEVEL4 225
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/* Number of calls to get_button for a button to stop bouncing
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* and to be considered held down.
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* Should really use a hardware timer for this.
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*/
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#define BOUNCE_COUNT 200
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#define HOLD_COUNT 10000
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static int last; /* Last button pressed */
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static int count; /* Number of calls button has been down */
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/*
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*Initialize buttons
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*/
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void button_init()
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{
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#ifndef SIMULATOR
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/* Set PB4 and PB8 as input pins */
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PBCR1 &= 0xfffc; /* PB8MD = 00 */
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PBCR2 &= 0xfcff; /* PB4MD = 00 */
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PBIOR &= ~(PBDR_BTN_ON|PBDR_BTN_OFF); /* Inputs */
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/* Set A/D to scan AN4 and AN5.
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* This needs to be changed to scan other analog pins
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* for battery level, etc. */
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ADCSR = 0;
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ADCR = 0;
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ADCSR = ADCSR_ADST | ADCSR_SCAN | 0x5;
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#endif
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last = BUTTON_NONE;
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count = 0;
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}
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/*
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* Get button pressed from hardware
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*/
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static int get_raw_button (void)
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{
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/* Check port B pins for ON and OFF */
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int data = PBDR;
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if ((data & PBDR_BTN_ON) == 0)
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return BUTTON_ON;
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else if ((data & PBDR_BTN_OFF) == 0)
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return BUTTON_OFF;
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/* Check AN4 pin for F1-3 and UP */
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data = ADDRAH;
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if (data >= LEVEL4)
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return BUTTON_F3;
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else if (data >= LEVEL3)
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return BUTTON_UP;
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else if (data >= LEVEL2)
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return BUTTON_F2;
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else if (data >= LEVEL1)
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return BUTTON_F1;
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/* Check AN5 pin for DOWN, PLAY, LEFT, RIGHT */
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data = ADDRBH;
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if (data >= LEVEL4)
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return BUTTON_DOWN;
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else if (data >= LEVEL3)
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return BUTTON_PLAY;
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else if (data >= LEVEL2)
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return BUTTON_LEFT;
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else if (data >= LEVEL1)
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return BUTTON_RIGHT;
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return BUTTON_NONE;
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}
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/*
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* Get the currently pressed button.
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* Returns one of BUTTON_xxx codes, with possibly a modifier bit set.
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* No modifier bits are set when the button is first pressed.
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* BUTTON_HELD bit is while the button is being held.
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* BUTTON_REL bit is set when button has been released.
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*/
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int button_get(void)
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{
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int btn = get_raw_button();
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int ret;
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/* Last button pressed is still down */
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if (btn != BUTTON_NONE && btn == last) {
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count++;
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if (count == BOUNCE_COUNT)
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return btn;
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else if (count >= HOLD_COUNT)
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return btn | BUTTON_HELD;
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else
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return BUTTON_NONE;
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}
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/* Last button pressed now released */
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if (btn == BUTTON_NONE && last != BUTTON_NONE)
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ret = last | BUTTON_REL;
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else
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ret = BUTTON_NONE;
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last = btn;
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count = 0;
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return ret;
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}
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#endif /* HAVE_RECORDER_KEYPAD */
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/* -----------------------------------------------------------------
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* local variables:
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* eval: (load-file "rockbox-mode.el")
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* end:
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*/
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