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Add hooks to CDC/ACM driver to support RX flow control

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This commit is contained in:
Gregory Nutt 2015-04-16 08:22:07 -06:00
parent 1f193dd515
commit 7bf9be7c33
1 changed files with 58 additions and 21 deletions
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79
drivers/usbdev/cdcacm.c
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@ -203,6 +203,11 @@ static int cdcuart_attach(FAR struct uart_dev_s *dev);
static void cdcuart_detach(FAR struct uart_dev_s *dev);
static int cdcuart_ioctl(FAR struct file *filep,int cmd,unsigned long arg);
static void cdcuart_rxint(FAR struct uart_dev_s *dev, bool enable);
#ifdef CONFIG_SERIAL_IFLOWCONTROL
static bool cdcuart_rxflowcontrol(FAR struct uart_dev_s *dev,
unsigned int nbuffered, bool upper);
#endif
static void cdcuart_txint(FAR struct uart_dev_s *dev, bool enable);
static bool cdcuart_txempty(FAR struct uart_dev_s *dev);
@ -213,16 +218,16 @@ static bool cdcuart_txempty(FAR struct uart_dev_s *dev);
static const struct usbdevclass_driverops_s g_driverops =
{
cdcacm_bind, /* bind */
cdcacm_unbind, /* unbind */
cdcacm_setup, /* setup */
cdcacm_disconnect, /* disconnect */
cdcacm_bind, /* bind */
cdcacm_unbind, /* unbind */
cdcacm_setup, /* setup */
cdcacm_disconnect, /* disconnect */
#ifdef CONFIG_SERIAL_REMOVABLE
cdcacm_suspend, /* suspend */
cdcacm_resume, /* resume */
cdcacm_suspend, /* suspend */
cdcacm_resume, /* resume */
#else
NULL, /* suspend */
NULL, /* resume */
NULL, /* suspend */
NULL, /* resume */
#endif
};
@ -230,21 +235,21 @@ static const struct usbdevclass_driverops_s g_driverops =
static const struct uart_ops_s g_uartops =
{
cdcuart_setup, /* setup */
cdcuart_shutdown, /* shutdown */
cdcuart_attach, /* attach */
cdcuart_detach, /* detach */
cdcuart_ioctl, /* ioctl */
NULL, /* receive */
cdcuart_rxint, /* rxinit */
NULL, /* rxavailable */
cdcuart_setup, /* setup */
cdcuart_shutdown, /* shutdown */
cdcuart_attach, /* attach */
cdcuart_detach, /* detach */
cdcuart_ioctl, /* ioctl */
NULL, /* receive */
cdcuart_rxint, /* rxinit */
NULL, /* rxavailable */
#ifdef CONFIG_SERIAL_IFLOWCONTROL
NULL, /* rxflowcontrol */
cdcuart_rxflowcontrol, /* rxflowcontrol */
#endif
NULL, /* send */
cdcuart_txint, /* txinit */
NULL, /* txready */
cdcuart_txempty /* txempty */
NULL, /* send */
cdcuart_txint, /* txinit */
NULL, /* txready */
cdcuart_txempty /* txempty */
};
/****************************************************************************
@ -2117,6 +2122,38 @@ static void cdcuart_rxint(FAR struct uart_dev_s *dev, bool enable)
irqrestore(flags);
}
/****************************************************************************
* Name: cdcuart_rxflowcontrol
*
* Description:
* Called when Rx buffer is full (or exceeds configured watermark levels
* if CONFIG_SERIAL_IFLOWCONTROL_WATERMARKS is defined).
* Return true if UART activated RX flow control to block more incoming
* data
*
* Input parameters:
* dev - UART device instance
* nbuffered - the number of characters currently buffered
* (if CONFIG_SERIAL_IFLOWCONTROL_WATERMARKS is
* not defined the value will be 0 for an empty buffer or the
* defined buffer size for a full buffer)
* upper - true indicates the upper watermark was crossed where
* false indicates the lower watermark has been crossed
*
* Returned Value:
* true if RX flow control activated.
*
****************************************************************************/
#ifdef CONFIG_SERIAL_IFLOWCONTROL
static bool cdcuart_rxflowcontrol(FAR struct uart_dev_s *dev,
unsigned int nbuffered, bool upper)
{
#warning Missing logic
return false;
}
#endif
/****************************************************************************
* Name: cdcuart_txint
*