/*
LUFA Library
- Copyright (C) Dean Camera, 2012.
+ Copyright (C) Dean Camera, 2021.
dean [at] fourwalledcubicle [dot] com
www.lufa-lib.org
*/
/*
- Copyright 2012 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
advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
- The author disclaim all warranties with regard to this
+ The author disclaims all warranties with regard to this
software, including all implied warranties of merchantability
and fitness. In no event shall the author be liable for any
special, indirect or consequential damages or any damages
/** \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.
*
* \param[in] Length Length of the data to send, in bytes.
*/
void Serial_SendData(USART_t* const USART,
- const uint8_t* Buffer, uint16_t Length) ATTR_NON_NULL_PTR_ARG(1);
+ const void* Buffer,
+ uint16_t Length) ATTR_NON_NULL_PTR_ARG(1);
/** Creates a standard character stream from the USART so that it can be used with all the regular functions
* in the avr-libc \c <stdio.h> library that accept a \c FILE stream as a destination (e.g. \c fprintf). The created
* 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);
-
- /** Identical to \ref Serial_CreateStream(), except that reads are blocking until the calling stream function terminates
+ void Serial_CreateStream(USART_t* USART, FILE* Stream);
+
+ /** 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,
const uint32_t BaudRate,
+ const bool DoubleSpeed) ATTR_NON_NULL_PTR_ARG(1);
+ static inline void Serial_Init(USART_t* const USART,
+ const uint32_t BaudRate,
const bool DoubleSpeed)
{
uint16_t BaudValue = (DoubleSpeed ? SERIAL_2X_UBBRVAL(BaudRate) : SERIAL_UBBRVAL(BaudRate));
USART->BAUDCTRLB = (BaudValue >> 8);
USART->BAUDCTRLA = (BaudValue & 0xFF);
-
+
USART->CTRLC = (USART_CMODE_ASYNCHRONOUS_gc | USART_PMODE_DISABLED_gc | USART_CHSIZE_8BIT_gc);
USART->CTRLB = (USART_RXEN_bm | USART_TXEN_bm | (DoubleSpeed ? USART_CLK2X_bm : 0));
}
*
* \param[in,out] USART Pointer to the base of the USART peripheral within the device.
*/
+ static inline void Serial_Disable(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1);
static inline void Serial_Disable(USART_t* const USART)
{
USART->CTRLA = 0;
USART->CTRLB = 0;
USART->CTRLC = 0;
}
-
+
/** Indicates whether a character has been received through the USART.
*
* \param[in,out] USART Pointer to the base of the USART peripheral within the device.
*
* \return Boolean \c true if a character has been received, \c false otherwise.
*/
- static inline bool Serial_IsCharReceived(USART_t* const USART) ATTR_WARN_UNUSED_RESULT ATTR_ALWAYS_INLINE;
+ static inline bool Serial_IsCharReceived(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1);
static inline bool Serial_IsCharReceived(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) ATTR_ALWAYS_INLINE;
+ const char DataByte) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1);
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;
}
*
* \return Next byte received from the USART, or a negative value if no byte has been received.
*/
- static inline int16_t Serial_ReceiveByte(USART_t* const USART) ATTR_ALWAYS_INLINE;
+ static inline int16_t Serial_ReceiveByte(USART_t* const USART) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1);
static inline int16_t Serial_ReceiveByte(USART_t* const USART)
{
if (!(Serial_IsCharReceived(USART)))
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