/*
LUFA Library
- Copyright (C) Dean Camera, 2013.
+ Copyright (C) Dean Camera, 2021.
dean [at] fourwalledcubicle [dot] com
www.lufa-lib.org
*/
/*
- Copyright 2013 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+ Copyright 2021 Dean Camera (dean [at] fourwalledcubicle [dot] com)
Permission to use, copy, modify, distribute, and sell this
software and its documentation for any purpose is hereby granted
/** \ingroup Group_Serial
* \defgroup Group_Serial_XMEGA Serial USART Peripheral Driver (XMEGA)
*
- * \section Sec_ModDescription Module Description
+ * \section Sec_Serial_XMEGA_ModDescription Module Description
* On-chip serial USART driver for the XMEGA AVR microcontrollers.
*
* \note This file should not be included directly. It is automatically included as needed by the USART driver
* dispatch header located in LUFA/Drivers/Peripheral/Serial.h.
*
- * \section Sec_ExampleUsage Example Usage
+ * \section Sec_Serial_XMEGA_ExampleUsage Example Usage
* The following snippet is an example of how this module may be used within a typical
* application.
*
* be used when the read data is processed byte-per-bye (via \c getc()) or when the user application will implement its own
* line buffering.
*
+ * \param[in,out] USART Pointer to the base of the USART peripheral within the device.
* \param[in,out] Stream Pointer to a FILE structure where the created stream should be placed, if \c NULL, \c stdout
* and \c stdin will be configured to use the USART.
*
* \pre The USART must first be configured via a call to \ref Serial_Init() before the stream is used.
*/
- void Serial_CreateStream(FILE* Stream);
+ void Serial_CreateStream(USART_t* USART, FILE* Stream);
- /** Identical to \ref Serial_CreateStream(), except that reads are blocking until the calling stream function terminates
+ /** Identical to \ref Serial_CreateStream(), except that reads are blocking until the calling stream function terminates
* the transfer.
*
+ * \param[in,out] USART Pointer to the base of the USART peripheral within the device.
* \param[in,out] Stream Pointer to a FILE structure where the created stream should be placed, if \c NULL, \c stdout
* and \c stdin will be configured to use the USART.
*
* \pre The USART must first be configured via a call to \ref Serial_Init() before the stream is used.
*/
- void Serial_CreateBlockingStream(FILE* Stream);
+ void Serial_CreateBlockingStream(USART_t* USART, FILE* Stream);
/* Inline Functions: */
/** Initializes the USART, ready for serial data transmission and reception. This initializes the interface to
* standard 8-bit, no parity, 1 stop bit settings suitable for most applications.
*
* \param[in,out] USART Pointer to the base of the USART peripheral within the device.
- * \param[in] BaudRate Serial baud rate, in bits per second.
+ * \param[in] BaudRate Serial baud rate, in bits per second. This should be the target baud rate regardless of
+ * the \c DoubleSpeed parameter's value.
* \param[in] DoubleSpeed Enables double speed mode when set, halving the sample time to double the baud rate.
*/
static inline void Serial_Init(USART_t* const USART,
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_TXCIF_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.
*/
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;
}
projects / pub / lufa.git / blobdiff