/*
* Signal a start to the TWSI Bus.
*
* A start is signaled when data goes to low in a high clock cycle.
*
* Ends with Clock Low.
*
* Status: not tested
*/
void SkI2cStart(
SK_IOC IoC) /* I/O Context */
{
/* Init data and Clock to output lines */
/* Set Data high */
I2C_DATA_OUT(IoC);
I2C_DATA_HIGH(IoC);
/* Set Clock high */
I2C_CLK_HIGH(IoC);
SkDgWaitTime(IoC, NS2BCLK(T_START_SETUP));
/* Set Data Low */
I2C_DATA_LOW(IoC);
SkDgWaitTime(IoC, NS2BCLK(T_START_HOLD));
/* Clock low without Data to Input */
I2C_START_COND(IoC);
SkDgWaitTime(IoC, NS2BCLK(T_CLK_LOW));
} /* SkI2cStart */
/*
* Receive just one bit via the I2C bus.
*
* Note: Clock must be set to LOW before calling this function.
*
* Returns The received bit.
*/
int SkI2cRcvBit(
SK_IOC IoC) /* I/O Context */
{
int Bit;
SK_U8 I2cSwCtrl;
/* Init data as input line */
I2C_DATA_IN(IoC);
SkDgWaitTime(IoC, NS2BCLK(T_CLK_2_DATA_OUT));
I2C_CLK_HIGH(IoC);
SkDgWaitTime(IoC, NS2BCLK(T_CLK_HIGH));
SK_I2C_GET_SW(IoC, &I2cSwCtrl);
Bit = (I2cSwCtrl & I2C_DATA) ? 1 : 0;
I2C_CLK_LOW(IoC);
SkDgWaitTime(IoC, NS2BCLK(T_CLK_LOW-T_CLK_2_DATA_OUT));
return(Bit);
} /* SkI2cRcvBit */
