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Fix some hanlding of TIE and RIE interrupt

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1224 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2008-11-13 20:16:07 +00:00
parent d55a8c56a1
commit 27f2657f12
1 changed files with 37 additions and 30 deletions
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45
arch/sh/src/sh1/sh1_serial.c
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@ -562,8 +562,6 @@ static int up_interrupt(int irq, void *context)
{
struct uart_dev_s *dev = NULL;
struct up_dev_s *priv;
int passes;
boolean handled;
#ifdef CONFIG_SH1_SCI0
if ((irq >= g_sci0priv.irq) &&
@ -586,18 +584,18 @@ static int up_interrupt(int irq, void *context)
}
priv = (struct up_dev_s*)dev->priv;
/* Loop until there are no characters to be transferred or,
* until we have been looping for a long time.
*/
for (passes = 0, handled = TRUE; passes < 256 && handled; passes++)
{
handled = FALSE;
/* Get the current SCI status */
priv->ssr = up_serialin(priv, SH1_SCI_SSR_OFFSET);
/* Handle receive-related events with RIE is enabled. RIE is enabled at
* times that driver is open EXCEPT when the driver is actively copying
* data from the circular buffer. In that case, the read events must
* pend until RIE is set
*/
if ((priv->scr & SH1_SCISCR_RIE) != 0)
{
/* Handle incoming, receive bytes (RDRF: Receive Data Register Full) */
if ((priv->ssr & SH1_SCISSR_RDRF) != 0)
@ -605,29 +603,38 @@ static int up_interrupt(int irq, void *context)
/* Rx data register not empty ... process incoming bytes */
uart_recvchars(dev);
handled = TRUE;
}
/* Handle outgoing, transmit bytes (TDRE: Transmit Data Register Empty) */
/* Clear all read related events (probably already done in up_receive)) */
if ((priv->ssr & SH1_SCISSR_TDRE) != 0)
priv->ssr &= ~(SH1_SCISSR_RDRF|SH1_SCISSR_ORER|SH1_SCISSR_FER|SH1_SCISSR_PER);
}
/* Handle outgoing, transmit bytes (TDRE: Transmit Data Register Empty)
* when TIE is enabled. TIE is only enabled when the driver is waiting with
* buffered data. Since TDRE is usually true,
*/
if ((priv->ssr & SH1_SCISSR_TDRE) != 0 && (priv->scr & SH1_SCISCR_TIE) != 0)
{
/* Tx data register empty ... process outgoing bytes */
uart_xmitchars(dev);
handled = TRUE;
/* Clear the TDR empty flag (Possibly done in up_send, will have not
* effect if the TDR is still empty)
*/
priv->ssr &= ~SH1_SCISSR_TDRE;
}
/* Clear all (clear-able) status flags. Note that that SH-1 requires
* that you read the bit in the "1" then write "0" to the bit in order
* to clear it. Any bits in the SSR that transitioned from 0->1 will
* not be effected by the following:
* to clear it. Any bits in the SSR that transitioned from 0->1 after
* we read the SR will not be effected by the following:
*/
priv->ssr &= ~(SH1_SCISSR_TDRE|SH1_SCISSR_RDRF|SH1_SCISSR_ORER|\
SH1_SCISSR_FER|SH1_SCISSR_PER|SH1_SCISSR_TEND);
up_serialout(priv, SH1_SCI_SSR_OFFSET, priv->ssr);
}
return OK;
}