diff options
Diffstat (limited to 'LUFA/Drivers/Peripheral/XMEGA/SerialSPI_XMEGA.h')
| -rw-r--r-- | LUFA/Drivers/Peripheral/XMEGA/SerialSPI_XMEGA.h | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/LUFA/Drivers/Peripheral/XMEGA/SerialSPI_XMEGA.h b/LUFA/Drivers/Peripheral/XMEGA/SerialSPI_XMEGA.h new file mode 100644 index 0000000000..ca3235083c --- /dev/null +++ b/LUFA/Drivers/Peripheral/XMEGA/SerialSPI_XMEGA.h @@ -0,0 +1,212 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2017. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2017 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 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 + 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 Master SPI Mode Serial USART 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 Master SPI Mode Serial USART Peripheral Driver (XMEGA) + * + * \section Sec_SerialSPI_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 ADC driver + * dispatch header located in LUFA/Drivers/Peripheral/SerialSPI.h. + * + * \section Sec_SerialSPI_XMEGA_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(&USARTD0, (USART_SPI_SCK_LEAD_RISING | USART_SPI_SAMPLE_LEADING | USART_SPI_ORDER_MSB_FIRST), 1000000); + * + * // Send several bytes, ignoring the returned data + * SerialSPI_SendByte(&USARTD0, 0x01); + * SerialSPI_SendByte(&USARTD0, 0x02); + * SerialSPI_SendByte(&USARTD0, 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(&USARTD0, 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 \ref 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 \ref SerialSPI_Init(). Indicates that the data should sampled on the leading edge. */ + #define USART_SPI_SAMPLE_LEADING 0 + + /** SPI data sample mode mask for \ref SerialSPI_Init(). Indicates that the data should be sampled on the trailing edge. */ + #define USART_SPI_SAMPLE_TRAILING (1 << 1) + //@} + + /** \name SPI Data Ordering Configuration Masks */ + //@{ + /** SPI data order mask for \ref SerialSPI_Init(). Indicates that data should be shifted out MSB first. */ + #define USART_SPI_ORDER_MSB_FIRST 0 + + /** SPI data order mask for \ref SerialSPI_Init(). Indicates that data should be shifted out LSB first. */ + #define USART_SPI_ORDER_LSB_FIRST (1 << 2) + //@} + + /* 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) ATTR_NON_NULL_PTR_ARG(1); + 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) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1); + 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) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1); + 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) ATTR_ALWAYS_INLINE ATTR_NON_NULL_PTR_ARG(1); + static inline void SerialSPI_SendByte(USART_t* const USART, + const uint8_t DataByte) + { + SerialSPI_TransferByte(USART, DataByte); + } + + /** 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) ATTR_ALWAYS_INLINE ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(1); + static inline uint8_t SerialSPI_ReceiveByte(USART_t* const USART) + { + return SerialSPI_TransferByte(USART, 0); + } + + /* Disable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + } + #endif + +#endif + +/** @} */ + |