--- /dev/null
+/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2012.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ Copyright 2012 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
+ without fee, provided that the above copyright notice appear in
+ all copies and that both that the copyright notice and this
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
+ software without specific, written prior permission.
+
+ The author disclaim 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
+ whatsoever resulting from loss of use, data or profits, whether
+ in an action of contract, negligence or other tortious action,
+ arising out of or in connection with the use or performance of
+ this software.
+*/
+
+/** \file
+ * \brief Serial USART Master SPI Mode Peripheral Driver (XMEGA)
+ *
+ * On-chip Master SPI mode USART driver for the XMEGA AVR microcontrollers.
+ *
+ * \note This file should not be included directly. It is automatically included as needed by the SPI Master
+ * Mode USART driver dispatch header located in LUFA/Drivers/Peripheral/Serial.h.
+ */
+
+/** \ingroup Group_SerialSPI
+ * \defgroup Group_SerialSPI_XMEGA Serial USART Peripheral Driver (XMEGA)
+ *
+ * \section Sec_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 ADC driver
+ * dispatch header located in LUFA/Drivers/Peripheral/SerialSPI.h.
+ *
+ * \section Sec_ExampleUsage Example Usage
+ * The following snippet is an example of how this module may be used within a typical
+ * application.
+ *
+ * \code
+ * // Initialize the Master SPI mode USART driver before first use, with 1Mbit baud
+ * SerialSPI_Init(&USARTD, (USART_SPI_SCK_LEAD_RISING | SPI_SAMPLE_LEADING | SPI_ORDER_MSB_FIRST), 1000000);
+ *
+ * // Send several bytes, ignoring the returned data
+ * SerialSPI_SendByte(&USARTD, 0x01);
+ * SerialSPI_SendByte(&USARTD, 0x02);
+ * SerialSPI_SendByte(&USARTD, 0x03);
+ *
+ * // Receive several bytes, sending a dummy 0x00 byte each time
+ * uint8_t Byte1 = SerialSPI_ReceiveByte(&USARTD);
+ * uint8_t Byte2 = SerialSPI_ReceiveByte(&USARTD);
+ * uint8_t Byte3 = SerialSPI_ReceiveByte(&USARTD);
+ *
+ * // Send a byte, and store the received byte from the same transaction
+ * uint8_t ResponseByte = SerialSPI_TransferByte(&USARTD, 0xDC);
+ * \endcode
+ *
+ * @{
+ */
+
+#ifndef __SERIAL_SPI_XMEGA_H__
+#define __SERIAL_SPI_XMEGA_H__
+
+ /* Includes: */
+ #include "../../../Common/Common.h"
+
+ #include <stdio.h>
+
+ /* Enable C linkage for C++ Compilers: */
+ #if defined(__cplusplus)
+ extern "C" {
+ #endif
+
+ /* Preprocessor Checks: */
+ #if !defined(__INCLUDE_FROM_SERIAL_SPI_H)
+ #error Do not include this file directly. Include LUFA/Drivers/Peripheral/Serial.h instead.
+ #endif
+
+ /* Private Interface - For use in library only: */
+ #if !defined(__DOXYGEN__)
+ #define SERIAL_SPI_UBBRVAL(Baud) ((Baud < (F_CPU / 2)) ? ((F_CPU / (2 * Baud)) - 1) : 0)
+ #endif
+
+ /* Public Interface - May be used in end-application: */
+ /* Macros: */
+ /** \name SPI SCK Polarity Configuration Masks */
+ //@{
+ /** SPI clock polarity mask for \c SerialSPI_Init(). Indicates that the SCK should lead on the rising edge. */
+ #define USART_SPI_SCK_LEAD_RISING 0
+ //@}
+
+ /** \name SPI Sample Edge Configuration Masks */
+ //@{
+ /** SPI data sample mode mask for \c SerialSPI_Init(). Indicates that the data should sampled on the leading edge. */
+ #define USART_SPI_SAMPLE_LEADING 0
+
+ /** SPI data sample mode mask for \c SerialSPI_Init(). Indicates that the data should be sampled on the trailing edge. */
+ #define USART_SPI_SAMPLE_TRAILING USART_UPCHA_bm
+ //@}
+
+ /** \name SPI Data Ordering Configuration Masks */
+ //@{
+ /** SPI data order mask for \c Serial_SPIInit(). Indicates that data should be shifted out MSB first. */
+ #define USART_SPI_ORDER_MSB_FIRST 0
+
+ /** SPI data order mask for \c Serial_SPIInit(). Indicates that data should be shifted out LSB first. */
+ #define USART_SPI_ORDER_LSB_FIRST USART_UDORD_bm
+ //@}
+
+ /* Inline Functions: */
+ /** Initialize the USART module in Master SPI mode.
+ *
+ * \param[in,out] USART Pointer to the base of the USART peripheral within the device.
+ * \param[in] SPIOptions USART SPI Options, a mask consisting of one of each of the \c USART_SPI_SCK_*,
+ * \c USART_SPI_SAMPLE_* and \c USART_SPI_ORDER_* masks.
+ * \param[in] BaudRate SPI baud rate, in bits per second.
+ */
+ static inline void SerialSPI_Init(USART_t* const USART,
+ const uint8_t SPIOptions,
+ const uint32_t BaudRate)
+ {
+ uint16_t BaudValue = SERIAL_SPI_UBBRVAL(BaudRate);
+
+ USART->BAUDCTRLB = (BaudValue >> 8);
+ USART->BAUDCTRLA = (BaudValue & 0xFF);
+
+ USART->CTRLC = (USART_CMODE_MSPI_gc | SPIOptions);
+ USART->CTRLB = (USART_RXEN_bm | USART_TXEN_bm);
+ }
+
+ /** Turns off the USART driver, disabling and returning used hardware to their default configuration.
+ *
+ * \param[in,out] USART Pointer to the base of the USART peripheral within the device.
+ */
+ static inline void SerialSPI_Disable(USART_t* const USART)
+ {
+ USART->CTRLA = 0;
+ USART->CTRLB = 0;
+ USART->CTRLC = 0;
+ }
+
+ /** Sends and receives a byte through the USART SPI interface, blocking until the transfer is complete.
+ *
+ * \param[in,out] USART Pointer to the base of the USART peripheral within the device.
+ * \param[in] DataByte Byte to send through the USART SPI interface.
+ *
+ * \return Response byte from the attached SPI device.
+ */
+ static inline uint8_t SerialSPI_TransferByte(USART_t* const USART,
+ const uint8_t DataByte)
+ {
+ USART->DATA = DataByte;
+ while (!(USART->STATUS & USART_TXCIF_bm));
+ USART->STATUS = USART_TXCIF_bm;
+ return USART->DATA;
+ }
+
+ /** Sends a byte through the USART SPI interface, blocking until the transfer is complete. The response
+ * byte sent to from the attached SPI device is ignored.
+ *
+ * \param[in,out] USART Pointer to the base of the USART peripheral within the device.
+ * \param[in] DataByte Byte to send through the USART SPI interface.
+ */
+ static inline void SerialSPI_SendByte(USART_t* const USART,
+ const uint8_t DataByte)
+ {
+ USART->DATA = DataByte;
+ while (!(USART->STATUS & USART_TXCIF_bm));
+ USART->STATUS = USART_TXCIF_bm;
+ }
+
+ /** Sends a dummy byte through the USART SPI interface, blocking until the transfer is complete. The response
+ * byte from the attached SPI device is returned.
+ *
+ * \param[in,out] USART Pointer to the base of the USART peripheral within the device.
+ *
+ * \return The response byte from the attached SPI device.
+ */
+ static inline uint8_t SerialSPI_ReceiveByte(USART_t* const USART)
+ {
+ USART->DATA = 0;
+ while (!(USART->STATUS & USART_TXCIF_bm));
+ USART->STATUS = USART_TXCIF_bm;
+ return USART->DATA;
+ }
+
+ /* Disable C linkage for C++ Compilers: */
+ #if defined(__cplusplus)
+ }
+ #endif
+
+#endif
+
+/** @} */
+
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