Finally commit FS#5111 - piezo clicker for ipods!

Origional implementation by Robert Keevil with contributions from Frederik Vestre,  Stoyan Stratev, Craig Elliott, Michael Sparmann,  Thomas Schott, Rosso Maltese, and syncs from a bunch of other people!

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30995 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 119 insertions, 0 deletions

diff --git a/firmware/target/arm/s5l8700/ipodnano2g/piezo-nano2g.c b/firmware/target/arm/s5l8700/ipodnano2g/piezo-nano2g.c
new file mode 100644
index 0000000000..d555b7232f
--- /dev/null
+++ b/firmware/target/arm/s5l8700/ipodnano2g/piezo-nano2g.c
@@ -0,0 +1,95 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006-2007 Robert Keevil
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+#include "system.h"
+#include "kernel.h"
+#include "piezo.h"
+
+static unsigned int duration;
+static bool beeping;
+
+void INT_TIMERD(void)
+{
+    /* clear interrupt */
+    TDCON = TDCON;
+    if (!(--duration))
+    {
+        beeping = 0;
+        TDCMD = (1 << 1);   /* TD_CLR */
+    }
+}
+
+void piezo_start(unsigned short cycles, unsigned short periods)
+{
+#ifndef SIMULATOR
+    duration = periods;
+    beeping = 1;
+    /* configure timer for 100 kHz */
+    TDCMD = (1 << 1);   /* TD_CLR */
+    TDPRE = 30 - 1;    /* prescaler */
+    TDCON = (1 << 13) | /* TD_INT1_EN */
+            (0 << 12) | /* TD_INT0_EN */
+            (0 << 11) | /* TD_START */
+            (2 << 8) |  /* TD_CS = PCLK / 16 */
+            (1 << 4);   /* TD_MODE_SEL = PWM mode */
+    TDDATA0 = cycles;   /* set interval period */
+    TDDATA1 = cycles << 1; /* set interval period */
+    TDCMD = (1 << 0);   /* TD_EN */
+
+    /* enable timer interrupt */
+    INTMSK |= INTMSK_TIMERD;
+#endif
+}
+
+void piezo_stop(void)
+{
+#ifndef SIMULATOR
+    TDCMD = (1 << 1);   /* TD_CLR */
+#endif
+}
+
+void piezo_clear(void)
+{
+    piezo_stop();
+}
+
+bool piezo_busy(void)
+{
+    return beeping;
+}
+
+void piezo_init(void)
+{
+    beeping = 0;
+}
+
+void piezo_button_beep(bool beep, bool force)
+{
+    if (force)
+        while (beeping)
+            yield();
+
+    if (!beeping)
+    {
+        if (beep)
+            piezo_start(22, 457);
+        else
+            piezo_start(40, 4);
+    }
+}
diff --git a/firmware/target/arm/s5l8700/ipodnano2g/piezo.h b/firmware/target/arm/s5l8700/ipodnano2g/piezo.h
new file mode 100644
index 0000000000..b8eae0943d
--- /dev/null
+++ b/firmware/target/arm/s5l8700/ipodnano2g/piezo.h
@@ -0,0 +1,24 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006-2007 Robert Keevil
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+void piezo_init(void);
+void piezo_stop(void);
+void piezo_clear(void);
+bool piezo_busy(void);
+void piezo_button_beep(bool beep, bool force);