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Add Serial_IsSendReady() and Serial_IsSendComplete() serial driver API functions.

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This commit is contained in:
Dean Camera
2014-07-15 21:23:13 +10:00
parent 0c00c2aaa3
commit 3d818fbb86
3 changed files with 57 additions and 2 deletions
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LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h
+30 -1
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@@ -216,7 +216,36 @@
return ((USART->STATUS & USART_RXCIF_bm) ? true : false);
}
/** Indicates whether there is hardware buffer space for a new transmit on the USART. This
* function can be used to determine if a call to \ref Serial_SendByte() will block in advance.
*
* \param[in,out] USART Pointer to the base of the USART peripheral within the device.
*
* \return Boolean \c true if a character can be queued for transmission immediately, \c false otherwise.
*/
static inline bool Serial_IsSendReady(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
static inline bool Serial_IsSendReady(USART_t* const USART)
{
return (USART->STATUS & USART_DREIF_bm) ? true : false);
}
/** Indicates whether the hardware USART transmit buffer is completely empty, indicating all
* pending transmissions have completed.
*
* \param[in,out] USART Pointer to the base of the USART peripheral within the device.
*
* \return Boolean \c true if no characters are buffered for transmission, \c false otherwise.
*/
static inline bool Serial_IsSendComplete(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
static inline bool Serial_IsSendComplete(USART_t* const USART)
{
return (USART->STATUS & USART_TCXIF_bm) ? true : false);
}
/** Transmits a given byte through the USART.
*
* \note If no buffer space is available in the hardware USART, this function will block. To check if
* space is available before calling this function, see \ref Serial_IsSendReady().
*
* \param[in,out] USART Pointer to the base of the USART peripheral within the device.
* \param[in] DataByte Byte to transmit through the USART.
@@ -226,7 +255,7 @@
static inline void Serial_SendByte(USART_t* const USART,
const char DataByte)
{
while (!(USART->STATUS & USART_DREIF_bm));
while (!(Serial_IsSendReady(USART));
USART->DATA = DataByte;
}