FS#10048 : enable MMU and data cache on Sansa AMS to give a major speed up

- cache IRAM and DRAM
- map IRAM just next to DRAM to remove the need for -mlong-calls and reduce binsize
- tweak delays in Fuze button code
- tweak delays in Clip button code (down button sometimes doesn't respond anyway : an alternate driver is being worked on)

Before reporting any problem, please check your filesystem or format your player from the OF

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21228 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 4 insertions, 1 deletions

diff --git a/firmware/target/arm/as3525/sansa-clip/button-clip.c b/firmware/target/arm/as3525/sansa-clip/button-clip.c
index b6da130d2f..2d2a3a661e 100644
--- a/firmware/target/arm/as3525/sansa-clip/button-clip.c
+++ b/firmware/target/arm/as3525/sansa-clip/button-clip.c
@@ -46,8 +46,9 @@ int button_read_device(void)
 
     /* This is a keypad using C4-C6 as columns and B0-B2 as rows */
     GPIOC_PIN(4) = (1<<4);
+    asm volatile("nop\nnop\nnop\nnop\nnop\n"); /* small delay */
 
-    /* C4B0 is unused */
+    (void)GPIOB_PIN(0); /* C4B0 is unused */
 
     if (GPIOB_PIN(1))
         result |= BUTTON_VOL_UP;
@@ -58,6 +59,7 @@ int button_read_device(void)
     GPIOC_PIN(4) = 0x00;
 
     GPIOC_PIN(5) = (1<<5);
+    asm volatile("nop\nnop\nnop\nnop\nnop\n"); /* small delay */
 
     if (GPIOB_PIN(0))
         result |= BUTTON_LEFT;
@@ -71,6 +73,7 @@ int button_read_device(void)
     GPIOC_PIN(5) = 0x00;
 
     GPIOC_PIN(6) = (1<<6);
+    asm volatile("nop\nnop\nnop\nnop\nnop\n"); /* small delay */
 
     if (GPIOB_PIN(0))
         result |= BUTTON_DOWN;