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as3525(v2): Add a somewhat inaccurate udelay (-0.5/+1.0µs). It should work good for some huge delays.

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Use it in fuzev2 to improve some big delays (correct the biggest one to actually wait for the fifo to empty), and use it in the sd drivers.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25734 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thomas Martitz 2010-04-27 09:34:29 +00:00
parent f2f34881ec
commit 845af676f8
5 changed files with 68 additions and 25 deletions
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15
firmware/target/arm/as3525/sansa-fuzev2/button-fuzev2.c
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@ -58,29 +58,26 @@ void get_scrollwheel(void)
int button_read_device(void)
{
int btn = 0;
volatile int delay;
static bool hold_button_old = false;
static long power_counter = 0;
unsigned gpiod6;
/* if we remove this delay, we see screen corruption (the higher the CPU
* frequency the higher the corruption) */
for(delay = 1000; delay; delay--)
nop;
/* if we don't wait for the fifo to empty, we'll see screen corruption
* (the higher the CPU frequency the higher the corruption) */
while ((DBOP_STAT & (1<<10)) == 0);
get_scrollwheel();
CCU_IO &= ~(1<<12);
GPIOB_PIN(0) = 1<<0;
for(delay = 500; delay; delay--)
nop;
udelay(1);
gpiod6 = GPIOD_PIN(6);
GPIOB_PIN(0) = 0;
for(delay = 240; delay; delay--)
nop;
udelay(1);
if (GPIOC_PIN(1) & 1<<1)
btn |= BUTTON_DOWN;