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Diffstat (limited to 'LUFA/Drivers/Peripheral/AVR8/SerialSPI_AVR8.h')
| -rw-r--r-- | LUFA/Drivers/Peripheral/AVR8/SerialSPI_AVR8.h | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/LUFA/Drivers/Peripheral/AVR8/SerialSPI_AVR8.h b/LUFA/Drivers/Peripheral/AVR8/SerialSPI_AVR8.h new file mode 100644 index 0000000000..052780e733 --- /dev/null +++ b/LUFA/Drivers/Peripheral/AVR8/SerialSPI_AVR8.h @@ -0,0 +1,208 @@ +/* + 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_AVR8 Master SPI Mode Serial USART Peripheral Driver (AVR8) + * + * \section Sec_SerialSPI_AVR8_ModDescription Module Description + * On-chip serial USART driver for the 8-bit AVR8 microcontrollers. + * + * \note This file should not be included directly. It is automatically included as needed by the SPI Master + * driver dispatch header located in LUFA/Drivers/Peripheral/SerialSPI.h. + * + * \section Sec_SerialSPI_AVR8_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((USART_SPI_SCK_LEAD_RISING | USART_SPI_SAMPLE_LEADING | USART_SPI_ORDER_MSB_FIRST), 1000000); + * + * // Send several bytes, ignoring the returned data + * SerialSPI_SendByte(0x01); + * SerialSPI_SendByte(0x02); + * SerialSPI_SendByte(0x03); + * + * // Receive several bytes, sending a dummy 0x00 byte each time + * uint8_t Byte1 = SerialSPI_ReceiveByte(); + * uint8_t Byte2 = SerialSPI_ReceiveByte(); + * uint8_t Byte3 = SerialSPI_ReceiveByte(); + * + * // Send a byte, and store the received byte from the same transaction + * uint8_t ResponseByte = SerialSPI_TransferByte(0xDC); + * \endcode + * + * @{ + */ + +#ifndef __SERIAL_SPI_AVR8_H__ +#define __SERIAL_SPI_AVR8_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) + + /* Master USART SPI mode flag definitions missing in the AVR8 toolchain */ + #if !defined(UCPHA1) + #define UCPHA1 1 + #endif + #if !defined(UDORD1) + #define UDORD1 2 + #endif + #endif + + /* Public Interface - May be used in end-application: */ + /* Macros: */ + /** \name SPI SCK Polarity Configuration Masks */ + //@{ + /** SPI clock polarity mask for \ref SPI_Init(). Indicates that the SCK should lead on the rising edge. */ + #define USART_SPI_SCK_LEAD_RISING (0 << UCPOL1) + + /** SPI clock polarity mask for \ref SPI_Init(). Indicates that the SCK should lead on the falling edge. */ + #define USART_SPI_SCK_LEAD_FALLING (1 << UCPOL1) + //@} + + /** \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 << UCPHA1) + + /** 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 << UCPHA1) + //@} + + /** \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 << UDORD1) + + /** SPI data order mask for \ref SerialSPI_Init(). Indicates that data should be shifted out LSB first. */ + #define USART_SPI_ORDER_LSB_FIRST (1 << UDORD1) + //@} + + /* Inline Functions: */ + /** Initialize the USART module in Master SPI mode. + * + * \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(const uint8_t SPIOptions, + const uint32_t BaudRate) + { + DDRD |= ((1 << 3) | (1 << 5)); + PORTD |= (1 << 2); + + UCSR1C = ((1 << UMSEL11) | (1 << UMSEL10) | SPIOptions); + UCSR1B = ((1 << TXEN1) | (1 << RXEN1)); + + UBRR1 = SERIAL_SPI_UBBRVAL(BaudRate); + } + + /** Turns off the USART driver, disabling and returning used hardware to their default configuration. */ + static inline void SerialSPI_Disable(void) + { + UCSR1B = 0; + UCSR1A = 0; + UCSR1C = 0; + + UBRR1 = 0; + + DDRD &= ~((1 << 3) | (1 << 5)); + PORTD &= ~(1 << 2); + } + + /** Sends and receives a byte through the USART SPI interface, blocking until the transfer is complete. + * + * \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(const uint8_t DataByte) + { + UDR1 = DataByte; + while (!(UCSR1A & (1 << TXC1))); + UCSR1A = (1 << TXC1); + return UDR1; + } + + /** 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] DataByte Byte to send through the USART SPI interface. + */ + static inline void SerialSPI_SendByte(const uint8_t DataByte) + { + SerialSPI_TransferByte(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. + * + * \return The response byte from the attached SPI device. + */ + static inline uint8_t SerialSPI_ReceiveByte(void) + { + return SerialSPI_TransferByte(0); + } + + /* Disable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + } + #endif + +#endif + +/** @} */ + |