ADC driver for iAudio X5

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8811 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 68 insertions, 0 deletions

diff --git a/firmware/target/coldfire/iaudio/x5/adc-x5.c b/firmware/target/coldfire/iaudio/x5/adc-x5.c
new file mode 100755
index 0000000000..c67b8b5c98
--- /dev/null
+++ b/firmware/target/coldfire/iaudio/x5/adc-x5.c
@@ -0,0 +1,68 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2006 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 "config.h"
+#include "cpu.h"
+#include "system.h"
+#include "kernel.h"
+#include "thread.h"
+#include "adc.h"
+#include "pcf50606.h"
+
+static unsigned char adcdata[NUM_ADC_CHANNELS];
+
+static int channelnum[] =
+{
+    5,   /* ADC_BUTTONS (ADCIN2) */
+    6,   /* ADC_REMOTE  (ADCIN3) */
+    0,   /* ADC_BATTERY (BATVOLT, resistive divider) */
+};
+
+unsigned char adc_scan(int channel)
+{
+    unsigned char data;
+    
+    pcf50606_write(0x2f, 0x80 | (channelnum[channel] << 1) | 1);
+    data = pcf50606_read(0x30);
+
+    adcdata[channel] = data;
+
+    return data;
+}
+
+unsigned short adc_read(int channel)
+{
+    return adcdata[channel];
+}
+
+static int adc_counter;
+
+static void adc_tick(void)
+{
+    if(++adc_counter == HZ)
+    {
+        adc_counter = 0;
+        adc_scan(ADC_BATTERY);
+    }
+}
+
+void adc_init(void)
+{
+    adc_scan(ADC_BATTERY);
+    tick_add_task(adc_tick);
+}