/***************************************************************************
Function: sWriteTxPrioByte
Purpose: Write a byte of priority transmit data to a channel
Call: sWriteTxPrioByte(ChP,Data)
CHANNEL_T *ChP; Ptr to channel structure
Byte_t Data; The transmit data byte
Return: int: 1 if the bytes is successfully written, otherwise 0.
Comments: The priority byte is transmitted before any data in the Tx FIFO.
Warnings: No context switches are allowed while executing this function.
*/
int sWriteTxPrioByte(CHANNEL_T *ChP, Byte_t Data)
{
Byte_t DWBuf[4]; /* buffer for double word writes */
if(sGetTxCnt(ChP) > 1) /* write it to Tx priority buffer */
{
rp_writech2(ChP,_INDX_ADDR,ChP->TxPrioCnt); /* get priority buffer status */
if(rp_readch1(ChP,_INDX_DATA) & PRI_PEND) /* priority buffer busy */
return(0); /* nothing sent */
le16enc(DWBuf,ChP->TxPrioBuf); /* data byte address */
DWBuf[2] = Data; /* data byte value */
DWBuf[3] = 0; /* priority buffer pointer */
rp_writech4(ChP,_INDX_ADDR,le32dec(DWBuf)); /* write it out */
le16enc(DWBuf,ChP->TxPrioCnt); /* Tx priority count address */
DWBuf[2] = PRI_PEND + 1; /* indicate 1 byte pending */
DWBuf[3] = 0; /* priority buffer pointer */
rp_writech4(ChP,_INDX_ADDR,le32dec(DWBuf)); /* write it out */
}
else /* write it to Tx FIFO */
{
sWriteTxByte(ChP,sGetTxRxDataIO(ChP),Data);
}
return(1); /* 1 byte sent */
}
/***************************************************************************
Function: sWriteTxPrioByte
Purpose: Write a byte of priority transmit data to a channel
Call: sWriteTxPrioByte(ChP,Data)
CHANNEL_T *ChP; Ptr to channel structure
Byte_t Data; The transmit data byte
Return: int: 1 if the bytes is successfully written, otherwise 0.
Comments: The priority byte is transmitted before any data in the Tx FIFO.
Warnings: No context switches are allowed while executing this function.
*/
int sWriteTxPrioByte(CHANNEL_T *ChP, Byte_t Data)
{
Byte_t DWBuf[4]; /* buffer for double word writes */
Word_t *WordPtr; /* must be far because Win SS != DS */
crit_enter();
if(sGetTxCnt(ChP) > 1) /* write it to Tx priority buffer */
{
rp_writech2(ChP,_INDX_ADDR,ChP->TxPrioCnt); /* get priority buffer status */
if(rp_readch1(ChP,_INDX_DATA) & PRI_PEND) {/* priority buffer busy */
crit_exit();
return(0); /* nothing sent */
}
WordPtr = (Word_t *)(&DWBuf[0]);
*WordPtr = ChP->TxPrioBuf; /* data byte address */
DWBuf[2] = Data; /* data byte value */
rp_writech4(ChP,_INDX_ADDR,*((DWord_t *)(&DWBuf[0]))); /* write it out */
*WordPtr = ChP->TxPrioCnt; /* Tx priority count address */
DWBuf[2] = PRI_PEND + 1; /* indicate 1 byte pending */
DWBuf[3] = 0; /* priority buffer pointer */
rp_writech4(ChP,_INDX_ADDR,*((DWord_t *)(&DWBuf[0]))); /* write it out */
}
else /* write it to Tx FIFO */
{
sWriteTxByte(ChP,sGetTxRxDataIO(ChP),Data);
}
crit_exit();
return(1); /* 1 byte sent */
}
