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Diffstat (limited to 'firmware/target/arm/tatung/tpj1022/adc-tpj1022.c')
-rw-r--r--firmware/target/arm/tatung/tpj1022/adc-tpj1022.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/firmware/target/arm/tatung/tpj1022/adc-tpj1022.c b/firmware/target/arm/tatung/tpj1022/adc-tpj1022.c
new file mode 100644
index 0000000000..134b90b587
--- /dev/null
+++ b/firmware/target/arm/tatung/tpj1022/adc-tpj1022.c
@@ -0,0 +1,101 @@
+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ * $Id$
+ *
+ * Copyright (C) 2006 by Barry Wardell
+ *
+ * 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"
+
+static unsigned short adcdata[NUM_ADC_CHANNELS];
+
+/* Scan ADC so that adcdata[channel] gets updated */
+unsigned short adc_scan(int channel)
+{
+ unsigned int adc_data_1;
+ unsigned int adc_data_2;
+
+ /* Initialise */
+ ADC_ADDR=0x130;
+ ADC_STATUS=0; /* 4 bytes, 1 per channel. Each byte is 0 if the channel is
+ off, 0x40 if the channel is on */
+
+ /* Enable Channel */
+ ADC_ADDR |= (0x1000000<<channel);
+
+ /* Start? */
+ ADC_ADDR |= 0x20000000;
+ ADC_ADDR |= 0x80000000;
+
+ /* ADC_DATA_1 and ADC_DATA_2 are both four bytes, one byte per channel.
+ For each channel, ADC_DATA_1 stores the 8-bit msb, ADC_DATA_2 stores the
+ 2-bit lsb (in bits 0 and 1). Each channel is 10 bits total. */
+ adc_data_1 = ((ADC_DATA_1 >> (8*channel)) & 0xff);
+ adc_data_2 = ((ADC_DATA_2 >> (8*channel+6)) & 0x3);
+
+ adcdata[channel] = (adc_data_1<<2 | adc_data_2);
+
+ return adcdata[channel];
+}
+
+/* Read 10-bit channel 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);
+ adc_scan(ADC_UNKNOWN_1);
+ adc_scan(ADC_UNKNOWN_2);
+ adc_scan(ADC_SCROLLPAD);
+ }
+}
+
+void adc_init(void)
+{
+ /* Enable ADC */
+ ADC_ENABLE_ADDR |= ADC_ENABLE;
+
+ /* Initialise */
+ ADC_INIT=0;
+ ADC_ADDR=0x130;
+ ADC_STATUS=0;
+
+ /* Enable Channels 1-4 */
+ ADC_ADDR |= 0x1000000;
+ ADC_ADDR |= 0x2000000;
+ ADC_ADDR |= 0x4000000;
+ ADC_ADDR |= 0x8000000;
+
+ /* Start? */
+ ADC_ADDR |= 0x20000000;
+ ADC_ADDR |= 0x80000000;
+
+ /* Wait 50ms for things to settle */
+ sleep(HZ/20);
+
+ tick_add_task(adc_tick);
+}