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Fix ata2501 serial reading

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18550 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Vitja Makarov 2008-09-19 05:55:11 +00:00
parent afe32ef15d
commit eab5498484
1 changed files with 14 additions and 27 deletions
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41
firmware/target/arm/tcc77x/iaudio7/ata2501.c
View file

@ -20,6 +20,7 @@
****************************************************************************/
#include "config.h"
#include "system.h"
#include "cpu.h"
#include "button.h"
@ -31,39 +32,27 @@
#define SIFMD (1<<7)
#define STB_DELAY 200
#define udelay _udelay
/* do we really need it? */
static void _udelay(int cycles)
static inline void ndelay(unsigned long nsecs)
{
cycles /= 8;
while (cycles--) {
asm("nop;nop;");
}
nsecs /= 8;
while (nsecs)
nsecs--;
}
/*
TODO: sensitivity using GPIOS
TODO: sensitivity
*/
void ata2501_init(void)
{
GPIOD_DIR |= (RESET | STB | SIFMD | (1 << 8) | (1 << 9));
GPIOD_DIR &= ~(SDATA);
GPIOD &= ~RESET;
udelay(1000);
GPIOD |= RESET;
GPIOD_DIR &= ~SDATA;
GPIOD &= ~STB;
GPIOD |= (1 << 8) | SIFMD | (1 << 9);
#if 1
GPIOD &= ~((1 << 9) | (1 << 8));
GPIOD |= ((1 << 8) | SIFMD) | (1 << 9);
#else
GPIOD |= ((1 << 9) | (1 << 8));
GPIOD &= ~(SIFMD);
#endif
GPIOD &= ~RESET;
ndelay(1000);
GPIOD |= RESET;
}
unsigned short ata2501_read(void)
@ -73,14 +62,12 @@ unsigned short ata2501_read(void)
for (i = 0; i < 12; i++) {
GPIOD |= STB;
udelay(50);
ndelay(100);
ret <<= 1;
if (GPIOD & SDATA)
ret |= 1;
udelay(50);
GPIOD &= ~STB;
udelay(100);
ndelay(100);
}
return ret;
@ -118,7 +105,7 @@ void ata2501_test(void)
lcd_puts(0, line++, buf);
lcd_update();
udelay(2000);
sleep(HZ/10);
}
}
#endif