Gary's code for reading the Recorder's keyboard. This can't yet be used in

the simulator as we need to tweak how it reads raw input when we simulate
this.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@101 a1c6a512-1295-4272-9138-f99709370657

firmware/button.c

@@ -0,0 +1,151 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Daniel Stenberg
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+/*
+ * Archos Jukebox Recorder button functions
+ */
+
+#include "config.h"
+
+#ifdef HAVE_RECORDER_KEYPAD
+
+#include "types.h"
+#include "sh7034.h"
+#include "button.h"
+
+/* AJBR buttons are connected to the CPU as follows:
+ *
+ * ON and OFF are connected to separate port B input pins.
+ *
+ * F1, F2, F3, and UP are connected to the AN4 analog input, each through
+ * a separate voltage divider.  The voltage on AN4 depends on which button
+ * (or none, or a combination) is pressed.
+ *
+ * DOWN, PLAY, LEFT, and RIGHT are likewise connected to AN5. */
+ 
+/* Button voltage levels on AN4 and AN5 */
+#define	LEVEL1		50
+#define	LEVEL2		125
+#define	LEVEL3		175
+#define	LEVEL4		225
+
+/* Number of calls to get_button for a button to stop bouncing
+ * and to be considered held down.
+ * Should really use a hardware timer for this.
+ */
+#define BOUNCE_COUNT	200
+#define HOLD_COUNT		10000
+
+static int last;	/* Last button pressed */
+static int count;	/* Number of calls button has been down */
+
+
+/*
+ *Initialize buttons
+ */
+void button_init()
+{
+#ifndef SIMULATOR
+  /* Set PB4 and PB8 as input pins */
+  PBCR1 &= 0xfffc; /* PB8MD = 00 */
+  PBCR2 &= 0xfcff; /* PB4MD = 00 */
+  PBIOR &= ~(PBDR_BTN_ON|PBDR_BTN_OFF); /* Inputs */
+  
+  /* Set A/D to scan AN4 and AN5.
+   * This needs to be changed to scan other analog pins
+   * for battery level, etc. */
+  ADCSR = 0;
+  ADCR  = 0;
+  ADCSR = ADCSR_ADST | ADCSR_SCAN | 0x5;
+#endif
+  last = BUTTON_NONE;
+  count = 0;
+}
+
+/*
+ * Get button pressed from hardware
+ */
+static int get_raw_button (void)
+{
+  /* Check port B pins for ON and OFF */
+  int data = PBDR;
+  if ((data & PBDR_BTN_ON) == 0)
+    return BUTTON_ON;
+  else if ((data & PBDR_BTN_OFF) == 0)
+    return BUTTON_OFF;
+
+  /* Check AN4 pin for F1-3 and UP */
+  data = ADDRAH;
+  if (data >= LEVEL4)
+    return BUTTON_F3;
+  else if (data >= LEVEL3)
+    return BUTTON_UP;
+  else if (data >= LEVEL2)
+    return BUTTON_F2;
+  else if (data >= LEVEL1)
+    return BUTTON_F1;
+
+  /* Check AN5 pin for DOWN, PLAY, LEFT, RIGHT */
+  data = ADDRBH;
+  if (data >= LEVEL4)
+    return BUTTON_DOWN;
+  else if (data >= LEVEL3)
+    return BUTTON_PLAY;
+  else if (data >= LEVEL2)
+    return BUTTON_LEFT;
+  else if (data >= LEVEL1)
+    return BUTTON_RIGHT;
+  
+  return BUTTON_NONE;
+}
+
+/*
+ * Get the currently pressed button.
+ * Returns one of BUTTON_xxx codes, with possibly a modifier bit set.
+ * No modifier bits are set when the button is first pressed.
+ * BUTTON_HELD bit is while the button is being held.
+ * BUTTON_REL bit is set when button has been released.
+ */
+int button_get(void)
+{
+  int btn = get_raw_button();
+  int ret;
+
+  /* Last button pressed is still down */
+  if (btn != BUTTON_NONE && btn == last) {
+    count++;
+    if (count == BOUNCE_COUNT)
+      return btn;
+    else if (count >= HOLD_COUNT)
+      return btn | BUTTON_HELD;
+    else
+      return BUTTON_NONE;
+  }
+
+  /* Last button pressed now released */
+  if (btn == BUTTON_NONE && last != BUTTON_NONE)
+    ret = last | BUTTON_REL;
+  else
+    ret = BUTTON_NONE;
+  
+  last = btn;
+  count = 0;
+  return ret;
+}
+
+#endif /* HAVE_RECORDER_KEYPAD */