//------------------------------------------------------------------------------
// Function: SendAddr
// Description:
//------------------------------------------------------------------------------
static uint8_t I2CSendAddr(uint8_t addr, uint8_t read)
{
volatile uint8_t x = 0; //delay variable
//generate START condition
SET_SCL();
#if 0
if(GET_SCL)
TX_DEBUG_PRINT(("GET_SCL is high rightly \n"));
else
TX_DEBUG_PRINT(("GET_SCL is low wrong\n"));
#endif
x++; //short delay to keep setup times in spec
CLEAR_SDA();
#if 0
if(!GET_SDA)
TX_DEBUG_PRINT(("GET_SDA is low rightly\n"));
else
TX_DEBUG_PRINT(("GET_SDA is high wrong\n"));
#endif
x++;
x++;
x++;
CLEAR_SCL();
#if 0
if(!GET_SCL)
TX_DEBUG_PRINT(("GET_SCL is low rightly\n"));
else
TX_DEBUG_PRINT(("GET_SCL is high wrong\n"));
#endif
x++;
return (I2CSendByte(addr|read)); //send address uint8_t with read/write bit
}
//------------------------------------------------------------------------------
// Function: SetSCLHigh
// Description:
//------------------------------------------------------------------------------
static uint8_t SetSCLHigh(void)
{
volatile uint8_t x = 0; //delay variable
uint32_t timeout = 0;
// set SCL high, and wait for it to go high in case slave is clock stretching
SET_SCL();
x++;
x++;
x++;
x++;
while (!GET_SCL())
{
/* do nothing - just wait */
//udelay(2);
timeout++;
if( timeout > 100000 ) // about 1s is enough
{
printk("\n ************IIC SCL low timeout...\n");
return IIC_SCL_TIMEOUT;
}
}
return IIC_OK;
}
void WriteToAD5422(unsigned char count,unsigned char *buf)
{
unsigned char ValueToWrite = 0;
unsigned char i = 0;
unsigned char j = 0;
CLR_LATCH();
for ( i=count;i>0;i-- )
{
ValueToWrite = *(buf+i-1);
for (j=0; j<8; j++)
{
CLR_SCL();
if (0x80 == (ValueToWrite & 0x80))
{
SET_SDO(); /* Send one to SDIN pin of AD5422*/
}
else
{
CLR_SDO(); /* Send zero to SDIN pin of AD5422*/
}
delay(1);
SET_SCL();
delay(1);
ValueToWrite <<= 1; /* Rotate data*/
}
}
CLR_SCL();
delay(1);
SET_LATCH();
delay(20);
}
