From 47ea030e2e68a51f91a2c2302b7ea4d3ee1a2a07 Mon Sep 17 00:00:00 2001
From: Rob Purchase <shotofadds@rockbox.org>
Date: Mon, 14 Jan 2008 22:04:48 +0000
Subject: Initial Cowon D2 commit: * bootloader test program (basic LCD &
 button drivers, reads touchscreen) * work-in-progress stubs for main build

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16090 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/target/arm/tcc780x/adc-tcc780x.c | 76 +++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 firmware/target/arm/tcc780x/adc-tcc780x.c

(limited to 'firmware/target/arm/tcc780x/adc-tcc780x.c')

diff --git a/firmware/target/arm/tcc780x/adc-tcc780x.c b/firmware/target/arm/tcc780x/adc-tcc780x.c
new file mode 100644
index 0000000000..871db2b61d
--- /dev/null
+++ b/firmware/target/arm/tcc780x/adc-tcc780x.c
@@ -0,0 +1,76 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2007 by Dave Chapman
+ *
+ * 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 "string.h"
+#include "adc.h"
+
+/* 
+  TODO: We probably want to do this on the timer interrupt once we get
+        interrupts going - see the sh-adc.c implementation for an example which
+        looks like it should work well with the TCC77x.
+
+  Also, this code is practically identical between 77x & 780x targets. 
+  Should probably find a common location to avoid the duplication.
+*/
+
+static unsigned short adcdata[8];
+
+static void adc_do_read(void)
+{
+    int i;
+    uint32_t adc_status;
+
+    PCLK_ADC |= PCK_EN;   /* Enable ADC clock */
+
+    /* Start converting the first 4 channels */
+    for (i = 0; i < 4; i++)
+        ADCCON = i;
+
+    /* Wait for data to become stable */
+    while ((ADCDATA & 0x1) == 0);
+
+    /* Now read the values back */
+    for (i=0;i < 4; i++) {
+        adc_status = ADCSTATUS;
+        adcdata[(adc_status >> 16) & 0x7] = adc_status & 0x3ff;
+    }
+
+    PCLK_ADC &= ~PCK_EN;   /* Disable ADC clock */
+}
+
+unsigned short adc_read(int channel)
+{
+    /* Either move this to an interrupt routine, or only perform the read if
+       the last call was X length of time ago. */
+    adc_do_read();
+
+    return adcdata[channel];
+}
+
+void adc_init(void)
+{
+    /* consider configuring PCK_ADC source here */
+    
+    ADCCON = (1<<4);         /* Leave standby mode */
+    ADCCFG |= 0x00000003;    /* Single-mode, auto power-down */
+}
-- 
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