/*******************************************************************************
* mvTwsiStopBitSet - Set stop bit on the bus
*
* DESCRIPTION:
* This routine set the stop bit on the TWSI bus.
* The function then wait for the stop bit to be cleared by the HW.
* Finally the function checks for status of 0xF8.
*
* INPUT:
* chanNum - TWSI channel
*
* OUTPUT:
* None.
*
* RETURN:
* MV_TRUE is stop bit was set successfuly on the bus.
*
*******************************************************************************/
MV_STATUS mvTwsiStopBitSet(MV_U8 chanNum)
{
MV_U32 timeout, temp;
/* Generate stop bit */
temp = MV_REG_READ(TWSI_CONTROL_REG(chanNum));
MV_REG_WRITE(TWSI_CONTROL_REG(chanNum), temp | TWSI_CONTROL_STOP_BIT);
twsiIntFlgClr(chanNum);
/* wait for stop bit to come down */
timeout = 0;
while( ((MV_REG_READ(TWSI_CONTROL_REG(chanNum)) & TWSI_CONTROL_STOP_BIT) != 0) && (timeout++ < TWSI_TIMEOUT_VALUE));
/* check for timeout */
if(MV_TRUE == twsiTimeoutChk(timeout,"TWSI: mvTwsiStopBitSet ERROR - Stop bit TimeOut .\n"))
return MV_TIMEOUT;
/* check that the stop bit went down */
if((MV_REG_READ(TWSI_CONTROL_REG(chanNum)) & TWSI_CONTROL_STOP_BIT) != 0)
{
mvOsPrintf("TWSI: mvTwsiStopBitSet ERROR - stop bit didn't went down. \n");
return MV_FAIL;
}
/* check the status */
temp = twsiStsGet(chanNum);
if( temp != TWSI_NO_REL_STS_INT_FLAG_IS_KEPT_0){
mvOsPrintf("TWSI: mvTwsiStopBitSet ERROR - status %x after Stop Bit. \n", temp);
return MV_FAIL;
}
return MV_OK;
}
/*******************************************************************************
* mvTwsiStopBitSet - Set stop bit on the bus
*
* DESCRIPTION:
* This routine set the stop bit on the TWSI bus.
* The function then wait for the stop bit to be cleared by the HW.
* Finally the function checks for status of 0xF8.
*
* INPUT:
* chanNum - TWSI channel.
*
* OUTPUT:
* None.
*
* RETURN:
* MV_TRUE is stop bit was set successfuly on the bus.
*
*******************************************************************************/
MV_STATUS mvTwsiStopBitSet(MV_U8 chanNum)
{
MV_U32 timeout, temp;
/* Generate stop bit */
temp = MV_REG_READ(TWSI_CONTROL_REG(chanNum));
MV_REG_WRITE(TWSI_CONTROL_REG(chanNum), temp | TWSI_CONTROL_STOP_BIT);
twsiIntFlgClr(chanNum);
/* wait for stop bit to come down */
timeout = 0;
while (((MV_REG_READ(TWSI_CONTROL_REG(chanNum)) & TWSI_CONTROL_STOP_BIT) != 0)
&& (timeout++ < TWSI_TIMEOUT_VALUE))
;
/* check for timeout */
if (MV_TRUE == twsiTimeoutChk(timeout, "TWSI: mvTwsiStopBitSet ERROR - Stop bit TimeOut .\n"))
return MV_TIMEOUT;
/* check that the stop bit went down */
if ((MV_REG_READ(TWSI_CONTROL_REG(chanNum)) & TWSI_CONTROL_STOP_BIT) != 0)
return MV_FAIL;
/* check the status */
temp = twsiStsGet(chanNum);
if ((TWSI_M_LOST_ARB_DUR_AD_OR_DATA_TRA == temp) ||
(TWSI_M_LOST_ARB_DUR_AD_TRA_GNL_CALL_AD_REC_ACK_TRA == temp))
return MV_TWSI_RETRY;
else if (temp != TWSI_NO_REL_STS_INT_FLAG_IS_KEPT_0)
return MV_FAIL;
return MV_OK;
}
/*******************************************************************************
* mvTwsiStartBitSet - Set start bit on the bus
*
* DESCRIPTION:
* This routine sets the start bit on the TWSI bus.
* The routine first checks for interrupt flag condition, then it sets
* the start bit in the TWSI Control register.
* If the interrupt flag condition check previously was set, the function
* will clear it.
* The function then wait for the start bit to be cleared by the HW.
* Then it waits for the interrupt flag to be set and eventually, the
* TWSI status is checked to be 0x8 or 0x10(repeated start bit).
*
* INPUT:
* chanNum - TWSI channel.
*
* OUTPUT:
* None.
*
* RETURN:
* MV_OK is start bit was set successfuly on the bus.
* MV_FAIL if interrupt flag was set before setting start bit.
*
*******************************************************************************/
MV_STATUS mvTwsiStartBitSet(MV_U8 chanNum)
{
MV_BOOL isIntFlag = MV_FALSE;
MV_U32 timeout, temp;
DB(mvOsPrintf("TWSI: mvTwsiStartBitSet \n"));
/* check Int flag */
if (twsiMainIntGet(chanNum))
isIntFlag = MV_TRUE;
/* set start Bit */
temp = MV_REG_READ(TWSI_CONTROL_REG(chanNum));
MV_REG_WRITE(TWSI_CONTROL_REG(chanNum), temp | TWSI_CONTROL_START_BIT);
/* in case that the int flag was set before i.e. repeated start bit */
if (isIntFlag) {
DB(mvOsPrintf("TWSI: mvTwsiStartBitSet repeated start Bit\n"));
twsiIntFlgClr(chanNum);
}
/* wait for interrupt */
timeout = 0;
while (!twsiMainIntGet(chanNum) && (timeout++ < TWSI_TIMEOUT_VALUE))
;
/* check for timeout */
if (MV_TRUE == twsiTimeoutChk(timeout,
(const MV_8 *)"TWSI: mvTwsiStartBitSet ERROR - Start Clear bit TimeOut .\n"))
return MV_TIMEOUT;
/* check that start bit went down */
if ((MV_REG_READ(TWSI_CONTROL_REG(chanNum)) & TWSI_CONTROL_START_BIT) != 0) {
mvOsPrintf("TWSI: mvTwsiStartBitSet ERROR - start bit didn't went down\n");
return MV_FAIL;
}
/* check the status */
temp = twsiStsGet(chanNum);
if ((TWSI_M_LOST_ARB_DUR_AD_OR_DATA_TRA == temp) || (TWSI_M_LOST_ARB_DUR_AD_TRA_GNL_CALL_AD_REC_ACK_TRA == temp)) {
DB(mvOsPrintf("TWSI: Lost Arb, status %x \n", temp));
return MV_RETRY;
} else if ((temp != TWSI_START_CON_TRA) && (temp != TWSI_REPEATED_START_CON_TRA)) {
mvOsPrintf("TWSI: mvTwsiStartBitSet ERROR - status %x after Set Start Bit. \n", temp);
return MV_FAIL;
}
return MV_OK;
}
/*******************************************************************************
* mvTwsiStartBitSet - Set start bit on the bus
*
* DESCRIPTION:
* This routine sets the start bit on the TWSI bus.
* The routine first checks for interrupt flag condition, then it sets
* the start bit in the TWSI Control register.
* If the interrupt flag condition check previously was set, the function
* will clear it.
* The function then wait for the start bit to be cleared by the HW.
* Then it waits for the interrupt flag to be set and eventually, the
* TWSI status is checked to be 0x8 or 0x10(repeated start bit).
*
* INPUT:
* None.
*
* OUTPUT:
* None.
*
* RETURN:
* MV_OK is start bit was set successfuly on the bus.
* MV_FAIL if interrupt flag was set before setting start bit.
*
*******************************************************************************/
MV_STATUS mvTwsiStartBitSet(MV_VOID)
{
MV_BOOL isIntFlag = MV_FALSE;
MV_U32 timeout, temp;
DB(mvOsPrintf("TWSI: mvTwsiStartBitSet \n"));
/* check Int flag */
if(twsiMainIntGet())
isIntFlag = MV_TRUE;
/* set start Bit */
temp = MV_REG_READ(TWSI_CONTROL_REG);
MV_REG_WRITE(TWSI_CONTROL_REG, temp | TWSI_CONTROL_START_BIT);
/* in case that the int flag was set before i.e. repeated start bit */
if(isIntFlag){
DB(mvOsPrintf("TWSI: mvTwsiStartBitSet repeated start Bit\n"));
twsiIntFlgClr();
}
/* wait for interrupt */
timeout = 0;
while(!twsiMainIntGet() && (timeout++ < TWSI_TIMEOUT_VALUE));
/* check for timeout */
if(MV_TRUE == twsiTimeoutChk(timeout,"TWSI: mvTwsiStartBitSet ERROR - Start Clear bit TimeOut .\n"))
return MV_TIMEOUT;
/* check that start bit went down */
if((MV_REG_READ(TWSI_CONTROL_REG) & TWSI_CONTROL_START_BIT) != 0)
{
mvOsPrintf("TWSI: mvTwsiStartBitSet ERROR - start bit didn't went down\n");
return MV_FAIL;
}
/* check the status */
temp = twsiStsGet();
if(( temp != TWSI_START_CON_TRA ) && ( temp != TWSI_REPEATED_START_CON_TRA ))
{
mvOsPrintf("TWSI: mvTwsiStartBitSet ERROR - status %x after Set Start Bit. \n",temp);
return MV_FAIL;
}
return MV_OK;
}
