summaryrefslogtreecommitdiffstats
path: root/firmware/target/coldfire/iaudio/x5/adc-x5.c
diff options
context:
space:
mode:
Diffstat (limited to 'firmware/target/coldfire/iaudio/x5/adc-x5.c')
-rwxr-xr-xfirmware/target/coldfire/iaudio/x5/adc-x5.c68
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);
+}