From 295367686ec9855c4d90f68a6003e819fef8e7ab Mon Sep 17 00:00:00 2001
From: Marcoen Hirschberg <marcoen@gmail.com>
Date: Fri, 29 Dec 2006 02:49:12 +0000
Subject: merge a big part of the unofficial gigabeat cvs back. Includes
 working bootloader and rockbox with audio.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11850 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/target/arm/gigabeat/meg-fx/sc606-meg-fx.c | 23 ++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

(limited to 'firmware/target/arm/gigabeat/meg-fx/sc606-meg-fx.c')

diff --git a/firmware/target/arm/gigabeat/meg-fx/sc606-meg-fx.c b/firmware/target/arm/gigabeat/meg-fx/sc606-meg-fx.c
index b0554a8260..39718a4ec6 100644
--- a/firmware/target/arm/gigabeat/meg-fx/sc606-meg-fx.c
+++ b/firmware/target/arm/gigabeat/meg-fx/sc606-meg-fx.c
@@ -24,10 +24,11 @@
 
 #define SCL_SDA_HI    GPHDAT |= (3 << 9)
 
-/* arbitrary delay loop */
-#define DELAY   do { int _x; for(_x=0;_x<2000;_x++);} while (0)
+/* The SC606 can clock at 400KHz: 2.5uS period -> 1.25uS half period */
+/* At 300Mhz - if loop takes 6 cycles @ 3.3nS each -> 1.25uS / 20nS -> 63 */
+#define DELAY   do { volatile int _x; for(_x=0;_x<63;_x++);} while (0)
 
-void sc606_i2c_start(void)
+static void sc606_i2c_start(void)
 {
     SCL_SDA_HI;
     DELAY;
@@ -36,7 +37,7 @@ void sc606_i2c_start(void)
     SCL_LO;
 }
 
-void sc606_i2c_restart(void)
+static void sc606_i2c_restart(void)
 {
     SCL_SDA_HI;
     DELAY;
@@ -45,7 +46,7 @@ void sc606_i2c_restart(void)
     SCL_LO;
 }
 
-void sc606_i2c_stop(void)
+static void sc606_i2c_stop(void)
 {
     SDA_LO;
     DELAY;
@@ -55,7 +56,7 @@ void sc606_i2c_stop(void)
     DELAY;
 }
 
-void sc606_i2c_ack(void)
+static void sc606_i2c_ack(void)
 {
 
     SDA_LO;
@@ -64,11 +65,11 @@ void sc606_i2c_ack(void)
     SCL_LO;
 }
 
-int sc606_i2c_getack(void)
+static int sc606_i2c_getack(void)
 {
     int ret = 0;
 
-    /* Don't need a delay since this follows a data bit with a delay on the end */
+    /* Don't need a delay since follows a data bit with a delay on the end */
     SDA_INPUT;   /* And set to input */
     SCL_HI;
     DELAY;
@@ -83,7 +84,7 @@ int sc606_i2c_getack(void)
     return ret;
 }
 
-int sc606_i2c_outb(unsigned char byte)
+static int sc606_i2c_outb(unsigned char byte)
 {
     int i;
 
@@ -106,7 +107,7 @@ int sc606_i2c_outb(unsigned char byte)
     return sc606_i2c_getack();
 }
 
-unsigned char sc606_i2c_inb(void)
+static unsigned char sc606_i2c_inb(void)
 {
    int i;
    unsigned char byte = 0;
@@ -128,6 +129,8 @@ unsigned char sc606_i2c_inb(void)
    return byte;
 }
 
+
+
 int sc606_write(unsigned char reg, unsigned char data)
 {
     int x = 0;
-- 
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