First version

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@604 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 106 insertions, 0 deletions

diff --git a/firmware/drivers/dac.c b/firmware/drivers/dac.c
new file mode 100644
index 0000000000..0ea47dac89
--- /dev/null
+++ b/firmware/drivers/dac.c
@@ -0,0 +1,68 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Linus Nielsen Feltzing
+ *
+ * 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 "i2c.h"
+#include "debug.h"
+#include "dac.h"
+
+int dac_volume(unsigned int volume)
+{
+    int i;
+    unsigned char buf[16];
+
+    if(volume > 0x38)
+        volume = 0x38;
+
+    i=0;
+    buf[i++] = DAC_REG_WRITE | DAC_AVOL;
+    buf[i++] = (volume & 0x3f) | 0x40; /* Deemphasis ON */
+    buf[i++] = volume & 0x3f;
+
+    /* send read command */
+    if (i2c_write(DAC_DEV_WRITE,buf,i))
+    {
+        return -1;
+    }
+    return 0;
+}
+
+/***************************************************
+** Bit6:  0 = 3V, 1 = 5V
+** Bit5:  0 = normal, 1 = low power
+** Bit4:  0 = AUX2 off, 1 = AUX2 on
+** Bit3:  0 = AUX1 off, 1 = AUX2 on
+** Bit2:  0 = DAC off, 1 = DAC on
+** Bit1:  0 = stereo, 1 = mono
+** Bit0:  0 = normal right amp, 1 = inverted right amp
+***************************************************/
+int dac_config(int value)
+{
+    int i;
+    unsigned char buf[16];
+
+    i=0;
+    buf[i++] = DAC_REG_WRITE | DAC_GCFG;
+    buf[i++] = value;
+
+    /* send read command */
+    if (i2c_write(DAC_DEV_WRITE,buf,i))
+    {
+        return -1;
+    }
+    return 0;
+}
diff --git a/firmware/drivers/dac.h b/firmware/drivers/dac.h
new file mode 100644
index 0000000000..c860538a24
--- /dev/null
+++ b/firmware/drivers/dac.h
@@ -0,0 +1,38 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Linus Nielsen Feltzing
+ *
+ * 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.
+ *
+ ****************************************************************************/
+#ifndef _DAC_H_
+#define _DAC_H_
+
+/*
+        DAC I2C defs
+*/
+#define DAC_ADR         0x9a
+#define DAC_DEV_WRITE   (DAC_ADR | 0x00)
+
+#define DAC_REG_WRITE   0xc0
+
+/* registers..*/
+#define DAC_SR_REG      1
+#define DAC_AVOL        2
+#define DAC_GCFG        3
+
+extern int dac_volume(unsigned int volume);
+extern int dac_config(int value);
+
+#endif