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S5L8700: use wakeup_wait/wakeup_signal instead of polling for i2c communication

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21735 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Bertrik Sikken 2009-07-09 22:08:54 +00:00
parent 9ecde3d75c
commit 8866342b1f
1 changed files with 20 additions and 7 deletions
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27
firmware/target/arm/s5l8700/i2c-s5l8700.c
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@ -39,10 +39,20 @@
*/
static struct mutex i2c_mtx;
static struct wakeup i2c_wakeup;
void INT_IIC(void)
{
/* disable interrupt (but don't clear it yet) */
IICCON &= ~((1 << 4) | (1 << 5));
wakeup_signal(&i2c_wakeup);
}
void i2c_init(void)
{
mutex_init(&i2c_mtx);
wakeup_init(&i2c_wakeup);
/* enable I2C pins */
PCON10 = (2 << 2) |
@ -61,6 +71,9 @@ void i2c_init(void)
/* serial output on */
IICSTAT = (1 << 4);
/* enable interrupt */
INTMSK |= (1 << 27);
}
int i2c_write(unsigned char slave, int address, int len, const unsigned char *data)
@ -71,20 +84,20 @@ int i2c_write(unsigned char slave, int address, int len, const unsigned char *da
IICDS = slave & ~1;
IICSTAT = 0xF0;
IICCON = 0xF3;
while ((IICCON & (1 << 4)) == 0);
wakeup_wait(&i2c_wakeup, TIMEOUT_BLOCK);
if (address >= 0) {
/* write address */
IICDS = address;
IICCON = 0xF3;
while ((IICCON & (1 << 4)) == 0);
wakeup_wait(&i2c_wakeup, TIMEOUT_BLOCK);
}
/* write data */
while (len--) {
IICDS = *data++;
IICCON = 0xF3;
while ((IICCON & (1 << 4)) == 0);
wakeup_wait(&i2c_wakeup, TIMEOUT_BLOCK);
}
/* STOP */
@ -105,23 +118,23 @@ int i2c_read(unsigned char slave, int address, int len, unsigned char *data)
IICDS = slave & ~1;
IICSTAT = 0xF0;
IICCON = 0xF3;
while ((IICCON & (1 << 4)) == 0);
wakeup_wait(&i2c_wakeup, TIMEOUT_BLOCK);
/* write address */
IICDS = address;
IICCON = 0xF3;
while ((IICCON & (1 << 4)) == 0);
wakeup_wait(&i2c_wakeup, TIMEOUT_BLOCK);
}
/* (repeated) START */
IICDS = slave | 1;
IICSTAT = 0xB0;
IICCON = 0xF3;
while ((IICCON & (1 << 4)) == 0);
wakeup_wait(&i2c_wakeup, TIMEOUT_BLOCK);
while (len--) {
IICCON = (len == 0) ? 0x73 : 0xF3; /* NACK or ACK */
while ((IICCON & (1 << 4)) == 0);
wakeup_wait(&i2c_wakeup, TIMEOUT_BLOCK);
*data++ = IICDS;
}