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Fuzev2: fix screen corruption

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Revive the delay removed by r25636 (and make it longer so it works when
boosted)
Also read GPIOA pins 7 & 6 in one load

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25722 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Rafaël Carré 2010-04-26 14:49:51 +00:00
parent 3925cfeede
commit 7e7b3c5ab3
1 changed files with 10 additions and 19 deletions
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29
firmware/target/arm/as3525/sansa-fuzev2/button-fuzev2.c
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@ -38,29 +38,15 @@ void button_init_device(void)
GPIOB_PIN(4) = 1<<4; /* activate the wheel */
}
unsigned read_GPIOA_67(void)
{
unsigned ret = 0;
volatile int i;
DBOP_CTRL |= 1<<19;
for(i = 20; i; i--) nop;
GPIOA_DIR &= ~0xc0;
for(i = 20; i; i--) nop;
if (GPIOA_PIN(6) != 0)
ret = 1<<0;
for(i = 20; i; i--) nop;
if (GPIOA_PIN(7) != 0)
ret |= 1<<1;
DBOP_CTRL &= ~(1<<19);
for(i = 20; i; i--) nop;
return ret;
}
void get_scrollwheel(void)
{
#if defined(HAVE_SCROLLWHEEL) && !defined(BOOTLOADER)
/* scroll wheel handling */
scrollwheel(read_GPIOA_67());
#define GPIOA_PIN76_offset ((1<<(6+2)) | (1<<(7+2)))
#define GPIOA_PIN76 (*(volatile unsigned char*)(GPIOA_BASE+GPIOA_PIN76_offset))
scrollwheel(GPIOA_PIN76 >> 6);
#endif
}
@ -77,6 +63,11 @@ int button_read_device(void)
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;
get_scrollwheel();
CCU_IO &= ~(1<<12);