115 lines
5.1 KiB
C
115 lines
5.1 KiB
C
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/* ----------------------------------------------------------------------------
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* ATMEL Microcontroller Software Support
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* ----------------------------------------------------------------------------
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* Copyright (c) 2008, Atmel Corporation
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the disclaimer below.
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*
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* Atmel's name may not be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* ----------------------------------------------------------------------------
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*/
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//------------------------------------------------------------------------------
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/// \dir
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/// !Purpose
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///
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/// Definitions for SPI peripheral usage.
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///
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/// !Usage
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///
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/// -# Enable the SPI pins required by the application (see pio.h).
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/// -# Configure the SPI using the SPI_Configure function. This enables the
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/// peripheral clock. The mode register is loaded with the given value.
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/// -# Configure all the necessary chip selects with SPI_ConfigureNPCS.
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/// -# Enable the SPI by calling SPI_Enable.
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/// -# Send/receive data using SPI_Write and SPI_Read. Note that SPI_Read
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/// must be called after SPI_Write to retrieve the last value read.
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/// -# Send/receive data using the PDC with the SPI_WriteBuffer and
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/// SPI_ReadBuffer functions.
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/// -# Disable the SPI by calling SPI_Disable.
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//------------------------------------------------------------------------------
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#ifndef SPI_H
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#define SPI_H
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//------------------------------------------------------------------------------
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// Headers
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//------------------------------------------------------------------------------
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#include <board.h>
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//------------------------------------------------------------------------------
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// Definitions
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//------------------------------------------------------------------------------
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//------------------------------------------------------------------------------
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/// \page "SPI configuration macros"
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/// This page lists several macros which should be used when configuring a SPI
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/// peripheral.
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///
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/// !Macros
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/// - SPI_PCS
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/// - SPI_SCBR
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/// - SPI_DLYBS
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/// - SPI_DLYBCT
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/// Calculate the PCS field value given the chip select NPCS value
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#define SPI_PCS(npcs) ((~(1 << npcs) & 0xF) << 16)
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/// Calculates the value of the CSR SCBR field given the baudrate and MCK.
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#define SPI_SCBR(baudrate, masterClock) \
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((unsigned int) (masterClock / baudrate) << 8)
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/// Calculates the value of the CSR DLYBS field given the desired delay (in ns)
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#define SPI_DLYBS(delay, masterClock) \
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((unsigned int) (((masterClock / 1000000) * delay) / 1000) << 16)
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/// Calculates the value of the CSR DLYBCT field given the desired delay (in ns)
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#define SPI_DLYBCT(delay, masterClock) \
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((unsigned int) (((masterClock / 1000000) * delay) / 32000) << 16)
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//------------------------------------------------------------------------------
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//------------------------------------------------------------------------------
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// Exported functions
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//------------------------------------------------------------------------------
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extern void SPI_Enable(AT91S_SPI *spi);
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extern void SPI_Disable(AT91S_SPI *spi);
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extern void SPI_Configure(AT91S_SPI *spi,
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unsigned int id,
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unsigned int configuration);
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extern void SPI_ConfigureNPCS(AT91S_SPI *spi,
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unsigned int npcs,
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unsigned int configuration);
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extern void SPI_Write(AT91S_SPI *spi, unsigned int npcs, unsigned short data);
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extern unsigned char SPI_WriteBuffer(AT91S_SPI *spi,
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void *buffer,
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unsigned int length);
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extern unsigned char SPI_IsFinished(AT91S_SPI *pSpi);
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extern unsigned short SPI_Read(AT91S_SPI *spi);
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extern unsigned char SPI_ReadBuffer(AT91S_SPI *spi,
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void *buffer,
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unsigned int length);
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#endif //#ifndef SPI_H
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