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Reduce impact of lost interrupts on S5L8700 I2C

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22953 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sparmann 2009-10-05 12:29:14 +00:00
parent 385e821d04
commit 57b51830d6
1 changed files with 7 additions and 7 deletions
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14
firmware/target/arm/s5l8700/i2c-s5l8700.c
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@ -85,20 +85,20 @@ int i2c_write(unsigned char slave, int address, int len, const unsigned char *da
IICDS = slave & ~1;
IICSTAT = 0xF0;
IICCON = 0xF3;
wakeup_wait(&i2c_wakeup, TIMEOUT_BLOCK);
while ((IICCON & 0x10) == 0) wakeup_wait(&i2c_wakeup, 1);
if (address >= 0) {
/* write address */
IICDS = address;
IICCON = 0xF3;
wakeup_wait(&i2c_wakeup, TIMEOUT_BLOCK);
while ((IICCON & 0x10) == 0) wakeup_wait(&i2c_wakeup, 1);
}
/* write data */
while (len--) {
IICDS = *data++;
IICCON = 0xF3;
wakeup_wait(&i2c_wakeup, TIMEOUT_BLOCK);
while ((IICCON & 0x10) == 0) wakeup_wait(&i2c_wakeup, 1);
}
/* STOP */
@ -119,23 +119,23 @@ int i2c_read(unsigned char slave, int address, int len, unsigned char *data)
IICDS = slave & ~1;
IICSTAT = 0xF0;
IICCON = 0xF3;
wakeup_wait(&i2c_wakeup, TIMEOUT_BLOCK);
while ((IICCON & 0x10) == 0) wakeup_wait(&i2c_wakeup, 1);
/* write address */
IICDS = address;
IICCON = 0xF3;
wakeup_wait(&i2c_wakeup, TIMEOUT_BLOCK);
while ((IICCON & 0x10) == 0) wakeup_wait(&i2c_wakeup, 1);
}
/* (repeated) START */
IICDS = slave | 1;
IICSTAT = 0xB0;
IICCON = 0xF3;
wakeup_wait(&i2c_wakeup, TIMEOUT_BLOCK);
while ((IICCON & 0x10) == 0) wakeup_wait(&i2c_wakeup, 1);
while (len--) {
IICCON = (len == 0) ? 0x73 : 0xF3; /* NACK or ACK */
wakeup_wait(&i2c_wakeup, TIMEOUT_BLOCK);
while ((IICCON & 0x10) == 0) wakeup_wait(&i2c_wakeup, 1);
*data++ = IICDS;
}