Sansa AMS i2c : fix 2 problems identified by Jack Halpin & Bertrik Sikken

i2c clock frequency uses pclk as reference, not plla
i2c clock divider is only 10 bits, not 16

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20929 a1c6a512-1295-4272-9138-f99709370657

2 files changed, 3 insertions, 3 deletions

diff --git a/firmware/target/arm/as3525/ascodec-as3525.c b/firmware/target/arm/as3525/ascodec-as3525.c
index 4f13dd6300..43a982f454 100644
--- a/firmware/target/arm/as3525/ascodec-as3525.c
+++ b/firmware/target/arm/as3525/ascodec-as3525.c
@@ -72,8 +72,8 @@ void ascodec_init(void)
 
     /* prescaler for i2c clock */
     prescaler = CLK_DIV(AS3525_PCLK_FREQ, AS3525_I2C_FREQ);
-    I2C2_CPSR0 = prescaler & 0xFF;
-    I2C2_CPSR1 = (prescaler >> 8) & 0xFF;
+    I2C2_CPSR0 = prescaler & 0xFF;          /* 8 lsb */
+    I2C2_CPSR1 = (prescaler >> 8) & 0x3;    /* 2 msb */
     
     /* set i2c slave address of codec part */
     I2C2_SLAD0 = AS3514_I2C_ADDR << 1;
diff --git a/firmware/target/arm/as3525/clock-target.h b/firmware/target/arm/as3525/clock-target.h
index f4b223cdff..49308ce9ea 100644
--- a/firmware/target/arm/as3525/clock-target.h
+++ b/firmware/target/arm/as3525/clock-target.h
@@ -53,7 +53,7 @@
 #endif
 
 #define AS3525_I2C_FREQ         400000
-#if (CLK_DIV(AS3525_PLLA_FREQ, AS3525_I2C_FREQ)) >= (1<<16) /* 2*8 bits */
+#if (CLK_DIV(AS3525_PCLK_FREQ, AS3525_I2C_FREQ)) >= (1<<10) /* 2+8 bits */
 #error I2C frequency is too low : clock divider will not fit !
 #endif