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Serial Upper Half: Add watermarks to RX flow control logic

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This commit is contained in:
Gregory Nutt 2014-12-27 07:43:06 -06:00
parent 214183ff93
commit 405d72c1ad
1 changed files with 8 additions and 4 deletions
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12
arch/arm/src/stm32/stm32_serial.c
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@ -327,7 +327,8 @@ static void up_rxint(struct uart_dev_s *dev, bool enable);
static bool up_rxavailable(struct uart_dev_s *dev);
#endif
#ifdef CONFIG_SERIAL_IFLOWCONTROL
static bool up_rxflowcontrol(struct uart_dev_s *dev);
static bool up_rxflowcontrol(struct uart_dev_s *dev, unsigned int nbuffered,
bool upper);
#endif
static void up_send(struct uart_dev_s *dev, int ch);
static void up_txint(struct uart_dev_s *dev, bool enable);
@ -2134,13 +2135,16 @@ static bool up_rxavailable(struct uart_dev_s *dev)
* Name: up_rxflowcontrol
*
* Description:
* Called when Rx buffer is full. Return true if the Rx interrupt was
* disabled.
* 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
*
****************************************************************************/
#ifdef CONFIG_SERIAL_IFLOWCONTROL
static bool up_rxflowcontrol(struct uart_dev_s *dev)
static bool up_rxflowcontrol(struct uart_dev_s *dev,
unsigned int nbuffered, bool upper)
{
struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
uint16_t ie;