You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
201 lines
7.0 KiB
201 lines
7.0 KiB
/*
|
|
LUFA Library
|
|
Copyright (C) Dean Camera, 2013.
|
|
|
|
dean [at] fourwalledcubicle [dot] com
|
|
www.lufa-lib.org
|
|
*/
|
|
|
|
/*
|
|
Copyright 2013 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 | SPI_SAMPLE_LEADING | 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)
|
|
#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 << UCPOL)
|
|
|
|
/** 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 << UCPOL)
|
|
//@}
|
|
|
|
/** \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 << UPCHA)
|
|
|
|
/** 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 << UPCHA)
|
|
//@}
|
|
|
|
/** \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 << UDORD)
|
|
|
|
/** SPI data order mask for \ref SerialSPI_Init(). Indicates that data should be shifted out LSB first. */
|
|
#define USART_SPI_ORDER_LSB_FIRST (1 << UDORD)
|
|
//@}
|
|
|
|
/* 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
|
|
|
|
/** @} */
|
|
|