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Add infrastructure to support RS-485 on the LPC43xx (logic still incomplete)

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4958 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2012-07-20 16:58:39 +00:00
parent 3c92ffa2f9
commit 7d79c38ac6
1 changed files with 60 additions and 0 deletions
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60
arch/arm/src/lpc43xx/lpc43_serial.c
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@ -857,6 +857,50 @@ static int up_interrupt(int irq, void *context)
return OK;
}
/****************************************************************************
* Name: up_set_rs485_mode
*
* Description:
* Handle LPC43xx USART0,2,3 RS485 mode set ioctl (TIOCSRS485) to enable
* and disable RS-485 mode. This is part of the serial ioctl logic.
*
****************************************************************************/
#ifdef CONFIG_USART_RS485MODE
static inline int up_set_rs485_mode(struct up_dev_s *priv,
const struct serial_rs485 *mode)
{
irqstate_t flags;
DEBUGASSERT(priv && mode);
flags = irqsave();
#warning "Missing logic"
irqrestore(flags);
}
#endif
/****************************************************************************
* Name: up_get_rs485_mode
*
* Description:
* Handle LPC43xx USART0,2,3 RS485 mode get ioctl (TIOCGRS485) to get the
* current RS-485 mode.
*
****************************************************************************/
#ifdef CONFIG_USART_RS485MODE
static inline int up_get_rs485_mode(struct up_dev_s *priv,
struct serial_rs485 *mode)
{
irqstate_t flags;
DEBUGASSERT(priv && mode);
flags = irqsave();
#warning "Missing logic"
irqrestore(flags);
}
#endif
/****************************************************************************
* Name: up_ioctl
*
@ -906,6 +950,22 @@ static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
}
break;
#ifdef CONFIG_USART_RS485MODE
case TIOCSRS485: /* Set RS485 mode, arg: pointer to struct serial_rs485 */
{
ret = up_set_rs485_mode(priv,
(const struct serial_rs485 *)((uintptr_t)arg));
}
break;
case TIOCGRS485: /* Get RS485 mode, arg: pointer to struct serial_rs485 */
{
ret = up_get_rs485_mode(priv,
(struct serial_rs485 *)((uintptr_t)arg));
}
break;
#endif
default:
*get_errno_ptr() = ENOTTY;
ret = ERROR;