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Integrating SHDC

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1828 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2009-05-27 20:45:39 +00:00
parent 869d6b8d57
commit 19cdfc42a4
1 changed files with 12 additions and 3 deletions
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15
arch/arm/src/lm3s/lm3s_ssi.c
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@ -426,7 +426,7 @@ static void ssi_semtake(sem_t *sem)
static void ssi_txnull(struct lm32_ssidev_s *priv)
{
ssivdbg("TX: ones\n");
ssivdbg("TX: ->0xffff\n");
ssi_putreg(priv, LM3S_SSI_DR_OFFSET, 0xffff);
}
@ -545,7 +545,9 @@ static inline boolean ssi_rxfifoempty(struct lm32_ssidev_s *priv)
static int ssi_performtx(struct lm32_ssidev_s *priv)
{
#ifndef CONFIG_SSI_POLLWAIT
uint32 regval;
#endif
int ntxd = 0; /* Number of words written to Tx FIFO */
/* Check if the Tx FIFO is full */
@ -559,8 +561,15 @@ static int ssi_performtx(struct lm32_ssidev_s *priv)
/* No.. Transfer more words until either the Tx FIFO is full or
* until all of the user provided data has been sent.
*/
#if 1
/* Further limit the number of words that we put into the Tx
* FIFO to half the half the FIFO depth. Otherwise, we could
* overrun the Rx FIFO on a very fast SSI bus.
*/
for (; ntxd < priv->ntxwords && ntxd < LM3S_TXFIFO_WORDS/2 && !ssi_txfifofull(priv); ntxd++)
#else
for (; ntxd < priv->ntxwords && !ssi_txfifofull(priv); ntxd++)
#endif
{
priv->txword(priv);
}
@ -809,7 +818,7 @@ static int ssi_transfer(struct lm32_ssidev_s *priv, const void *txbuffer,
*
* Returned Value:
* On success, a reference to the private data structgure for this IRQ.
* NULL on failrue.
* NULL on failure.
*
****************************************************************************/