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Use I2C2_DACNT register (number of pending i2c bytes to read/write) to determine if an ascodec i2c transfer is done. This should fix i2c problems with MMU enabled.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21150 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Bertrik Sikken 2009-05-31 17:48:19 +00:00
parent 29d7db4a46
commit 9067c915ad
1 changed files with 27 additions and 39 deletions
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66
firmware/target/arm/as3525/ascodec-as3525.c
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@ -97,39 +97,31 @@ static int i2c_busy(void)
return (I2C2_SR & 1);
}
/* returns 0 on success, <0 otherwise */
int ascodec_write(unsigned int index, unsigned int value)
{
int retval;
ascodec_lock();
/* check if still busy */
if (i2c_busy()) {
retval = -1;
}
else {
if (index == AS3514_CVDD_DCDC3) {
/* prevent setting of the LREG_CP_not bit */
value &= ~(1 << 5);
}
/* start transfer */
I2C2_SADDR = index;
I2C2_CNTRL &= ~(1 << 1);
I2C2_DATA = value;
I2C2_DACNT = 1;
/* wait for transfer*/
while (i2c_busy());
retval = 0;
/* wait if still busy */
while (i2c_busy());
if (index == AS3514_CVDD_DCDC3) {
/* prevent setting of the LREG_CP_not bit */
value &= ~(1 << 5);
}
/* start transfer */
I2C2_SADDR = index;
I2C2_CNTRL &= ~(1 << 1);
I2C2_DATA = value;
I2C2_DACNT = 1;
/* wait for transfer */
while (I2C2_DACNT != 0);
ascodec_unlock();
return retval;
return 0;
}
@ -140,21 +132,17 @@ int ascodec_read(unsigned int index)
ascodec_lock();
/* check if still busy */
if (i2c_busy()) {
data = -1;
}
else {
/* start transfer */
I2C2_SADDR = index;
I2C2_CNTRL |= (1 << 1);
I2C2_DACNT = 1;
/* wait for transfer*/
while (i2c_busy());
data = I2C2_DATA;
}
/* wait if still busy */
while (i2c_busy());
/* start transfer */
I2C2_SADDR = index;
I2C2_CNTRL |= (1 << 1);
I2C2_DACNT = 1;
/* wait for transfer*/
while (I2C2_DACNT != 0);
data = I2C2_DATA;
ascodec_unlock();