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Fixed busy timeout handling; better comments

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5240 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2004-10-09 22:48:10 +00:00
parent dd937dcfaf
commit 0660105af2
1 changed files with 6 additions and 4 deletions
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8
firmware/drivers/ata_mmc.c
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@ -246,7 +246,8 @@ static void read_transfer(unsigned char *buf, int len)
*buf = fliptable[(signed char)(RDR1)]; /* read & bitswap */
}
static unsigned char poll_byte(int timeout) /* timeout is in bytes */
/* returns 0xFF on timeout, timeout is in bytes */
static unsigned char poll_byte(int timeout)
{
int i;
unsigned char data = 0; /* stop the compiler complaining */
@ -264,7 +265,8 @@ static unsigned char poll_byte(int timeout) /* timeout is in bytes */
return fliptable[(signed char)data];
}
static unsigned char poll_busy(int timeout) /* timeout is in bytes */
/* returns 0 on timeout, timeout is in bytes */
static unsigned char poll_busy(int timeout)
{
int i;
unsigned char data, dummy;
@ -285,7 +287,7 @@ static unsigned char poll_busy(int timeout) /* timeout is in bytes */
dummy = RDR1; /* read byte */
} while ((dummy != 0xFF) && (++i < timeout));
return data;
return (dummy == 0xFF) ? data : 0;
}
/* Send MMC command and get response */