209 lines
7.2 KiB
C
209 lines
7.2 KiB
C
/*
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LUFA Library
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Copyright (C) Dean Camera, 2017.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaims all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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* \brief Master SPI Mode Serial USART Peripheral Driver (XMEGA)
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*
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* On-chip Master SPI mode USART driver for the XMEGA AVR microcontrollers.
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*
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* \note This file should not be included directly. It is automatically included as needed by the SPI Master
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* Mode USART driver dispatch header located in LUFA/Drivers/Peripheral/Serial.h.
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*/
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/** \ingroup Group_SerialSPI
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* \defgroup Group_SerialSPI_AVR8 Master SPI Mode Serial USART Peripheral Driver (AVR8)
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*
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* \section Sec_SerialSPI_AVR8_ModDescription Module Description
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* On-chip serial USART driver for the 8-bit AVR8 microcontrollers.
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*
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* \note This file should not be included directly. It is automatically included as needed by the SPI Master
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* driver dispatch header located in LUFA/Drivers/Peripheral/SerialSPI.h.
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*
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* \section Sec_SerialSPI_AVR8_ExampleUsage Example Usage
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* The following snippet is an example of how this module may be used within a typical
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* application.
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*
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* \code
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* // Initialize the Master SPI mode USART driver before first use, with 1Mbit baud
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* SerialSPI_Init((USART_SPI_SCK_LEAD_RISING | USART_SPI_SAMPLE_LEADING | USART_SPI_ORDER_MSB_FIRST), 1000000);
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*
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* // Send several bytes, ignoring the returned data
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* SerialSPI_SendByte(0x01);
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* SerialSPI_SendByte(0x02);
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* SerialSPI_SendByte(0x03);
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*
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* // Receive several bytes, sending a dummy 0x00 byte each time
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* uint8_t Byte1 = SerialSPI_ReceiveByte();
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* uint8_t Byte2 = SerialSPI_ReceiveByte();
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* uint8_t Byte3 = SerialSPI_ReceiveByte();
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*
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* // Send a byte, and store the received byte from the same transaction
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* uint8_t ResponseByte = SerialSPI_TransferByte(0xDC);
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* \endcode
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*
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* @{
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*/
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#ifndef __SERIAL_SPI_AVR8_H__
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#define __SERIAL_SPI_AVR8_H__
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/* Includes: */
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#include "../../../Common/Common.h"
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#include <stdio.h>
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/* Enable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* Preprocessor Checks: */
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#if !defined(__INCLUDE_FROM_SERIAL_SPI_H)
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#error Do not include this file directly. Include LUFA/Drivers/Peripheral/Serial.h instead.
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#endif
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/* Private Interface - For use in library only: */
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#if !defined(__DOXYGEN__)
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#define SERIAL_SPI_UBBRVAL(Baud) ((Baud < (F_CPU / 2)) ? ((F_CPU / (2 * Baud)) - 1) : 0)
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/* Master USART SPI mode flag definitions missing in the AVR8 toolchain */
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#if !defined(UCPHA1)
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#define UCPHA1 1
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#endif
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#if !defined(UDORD1)
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#define UDORD1 2
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#endif
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#endif
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/* Public Interface - May be used in end-application: */
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/* Macros: */
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/** \name SPI SCK Polarity Configuration Masks */
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//@{
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/** SPI clock polarity mask for \ref SPI_Init(). Indicates that the SCK should lead on the rising edge. */
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#define USART_SPI_SCK_LEAD_RISING (0 << UCPOL1)
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/** SPI clock polarity mask for \ref SPI_Init(). Indicates that the SCK should lead on the falling edge. */
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#define USART_SPI_SCK_LEAD_FALLING (1 << UCPOL1)
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//@}
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/** \name SPI Sample Edge Configuration Masks */
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//@{
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/** SPI data sample mode mask for \ref SerialSPI_Init(). Indicates that the data should sampled on the leading edge. */
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#define USART_SPI_SAMPLE_LEADING (0 << UCPHA1)
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/** SPI data sample mode mask for \ref SerialSPI_Init(). Indicates that the data should be sampled on the trailing edge. */
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#define USART_SPI_SAMPLE_TRAILING (1 << UCPHA1)
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//@}
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/** \name SPI Data Ordering Configuration Masks */
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//@{
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/** SPI data order mask for \ref SerialSPI_Init(). Indicates that data should be shifted out MSB first. */
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#define USART_SPI_ORDER_MSB_FIRST (0 << UDORD1)
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/** SPI data order mask for \ref SerialSPI_Init(). Indicates that data should be shifted out LSB first. */
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#define USART_SPI_ORDER_LSB_FIRST (1 << UDORD1)
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//@}
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/* Inline Functions: */
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/** Initialize the USART module in Master SPI mode.
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*
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* \param[in] SPIOptions USART SPI Options, a mask consisting of one of each of the \c USART_SPI_SCK_*,
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* \c USART_SPI_SAMPLE_* and \c USART_SPI_ORDER_* masks.
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* \param[in] BaudRate SPI baud rate, in bits per second.
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*/
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static inline void SerialSPI_Init(const uint8_t SPIOptions,
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const uint32_t BaudRate)
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{
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DDRD |= ((1 << 3) | (1 << 5));
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PORTD |= (1 << 2);
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UCSR1C = ((1 << UMSEL11) | (1 << UMSEL10) | SPIOptions);
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UCSR1B = ((1 << TXEN1) | (1 << RXEN1));
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UBRR1 = SERIAL_SPI_UBBRVAL(BaudRate);
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}
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/** Turns off the USART driver, disabling and returning used hardware to their default configuration. */
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static inline void SerialSPI_Disable(void)
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{
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UCSR1B = 0;
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UCSR1A = 0;
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UCSR1C = 0;
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UBRR1 = 0;
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DDRD &= ~((1 << 3) | (1 << 5));
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PORTD &= ~(1 << 2);
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}
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/** Sends and receives a byte through the USART SPI interface, blocking until the transfer is complete.
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*
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* \param[in] DataByte Byte to send through the USART SPI interface.
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*
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* \return Response byte from the attached SPI device.
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*/
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static inline uint8_t SerialSPI_TransferByte(const uint8_t DataByte)
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{
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UDR1 = DataByte;
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while (!(UCSR1A & (1 << TXC1)));
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UCSR1A = (1 << TXC1);
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return UDR1;
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}
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/** Sends a byte through the USART SPI interface, blocking until the transfer is complete. The response
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* byte sent to from the attached SPI device is ignored.
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*
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* \param[in] DataByte Byte to send through the USART SPI interface.
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*/
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static inline void SerialSPI_SendByte(const uint8_t DataByte)
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{
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SerialSPI_TransferByte(DataByte);
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}
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/** Sends a dummy byte through the USART SPI interface, blocking until the transfer is complete. The response
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* byte from the attached SPI device is returned.
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*
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* \return The response byte from the attached SPI device.
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*/
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static inline uint8_t SerialSPI_ReceiveByte(void)
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{
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return SerialSPI_TransferByte(0);
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}
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/* Disable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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}
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#endif
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#endif
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/** @} */
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