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authorDean Camera <dean@fourwalledcubicle.com>2014-07-15 21:23:13 +1000
committerDean Camera <dean@fourwalledcubicle.com>2014-07-15 21:23:13 +1000
commit3d818fbb86ddb648c6df4d9389dc025510a169b6 (patch)
tree1d807808fa9217039a7ae3619017441d2bbdafd8 /LUFA/Drivers
parent0c00c2aaa30421aea2e949443853971ec11a82bb (diff)
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Add Serial_IsSendReady() and Serial_IsSendComplete() serial driver API functions.
Diffstat (limited to 'LUFA/Drivers')
-rw-r--r--LUFA/Drivers/Peripheral/AVR8/Serial_AVR8.h27
-rw-r--r--LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h31
2 files changed, 56 insertions, 2 deletions
diff --git a/LUFA/Drivers/Peripheral/AVR8/Serial_AVR8.h b/LUFA/Drivers/Peripheral/AVR8/Serial_AVR8.h
index f951f6b74..e8860a511 100644
--- a/LUFA/Drivers/Peripheral/AVR8/Serial_AVR8.h
+++ b/LUFA/Drivers/Peripheral/AVR8/Serial_AVR8.h
@@ -210,14 +210,39 @@
return ((UCSR1A & (1 << RXC1)) ? 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.
+ *
+ * \return Boolean \c true if a character can be queued for transmission immediately, \c false otherwise.
+ */
+ static inline bool Serial_IsSendReady(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
+ static inline bool Serial_IsSendReady(void)
+ {
+ return ((UCSR1A & (1 << UDRE1)) ? true : false);
+ }
+
+ /** Indicates whether the hardware USART transmit buffer is completely empty, indicating all
+ * pending transmissions have completed.
+ *
+ * \return Boolean \c true if no characters are buffered for transmission, \c false otherwise.
+ */
+ static inline bool Serial_IsSendComplete(void) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
+ static inline bool Serial_IsSendComplete(void)
+ {
+ return ((UCSR1A & (1 << TXC1)) ? 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] DataByte Byte to transmit through the USART.
*/
static inline void Serial_SendByte(const char DataByte) ATTR_ALWAYS_INLINE;
static inline void Serial_SendByte(const char DataByte)
{
- while (!(UCSR1A & (1 << UDRE1)));
+ while (!(Serial_IsSendReady()));
UDR1 = DataByte;
}
diff --git a/LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h b/LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h
index 1161ef674..e7f9fee24 100644
--- a/LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h
+++ b/LUFA/Drivers/Peripheral/XMEGA/Serial_XMEGA.h
@@ -216,8 +216,37 @@
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;
}