134 lines
6.0 KiB
C
134 lines
6.0 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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/// Set of functions and definition for using a SSC
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/// peripheral.
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///
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/// !Usage
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///
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/// -# Configure the SSC to operate at a specific frequency by calling
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/// SSC_Configure(). This function enables the peripheral clock of the SSC,
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/// but not its PIOs.
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/// -# Configure the transmitter and/or the receiver using the
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/// SSC_ConfigureTransmitter() and SSC_ConfigureEmitter() functions.
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/// -# Enable the PIOs or the transmitter and/or the received using
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/// CHIP_EnableSSCTransmitter() and CHIP_EnableSSCReceiver().
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/// -# Enable the transmitter and/or the receiver using SSC_EnableTransmitter()
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/// and SSC_EnableReceiver()
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/// -# Send data through the transmitter using SSC_Write() and SSC_WriteBuffer()
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/// -# Receive data from the receiver using SSC_Read() and SSC_ReadBuffer()
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/// -# Disable the transmitter and/or the receiver using SSC_DisableTransmitter()
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/// and SSC_DisableReceiver()
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//------------------------------------------------------------------------------
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#ifndef SSC_H
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#define SSC_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 "SSC configuration macros"
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/// This page lists several macros which are used when configuring a SSC
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/// peripheral.
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///
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/// !Macros
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/// - SSC_STTDLY
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/// - SSC_PERIOD
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/// - SSC_DATLEN
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/// - SSC_DATNB
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/// - SSC_FSLEN
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/// Calculates the value of the STTDLY field given the number of clock cycles
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/// before the first bit of a new frame is transmitted.
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#define SSC_STTDLY(bits) (bits << 16)
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/// Calculates the value of the PERIOD field of the Transmit Clock Mode Register
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/// of an SSC interface, given the desired clock divider.
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#define SSC_PERIOD(divider) (((divider / 2) - 1) << 24)
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/// Calculates the value of the DATLEN field of the Transmit Frame Mode Register
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/// of an SSC interface, given the number of bits in one sample.
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#define SSC_DATLEN(bits) (bits - 1)
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/// Calculates the value of the DATNB field of the Transmit Frame Mode Register
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/// of an SSC interface, given the number of samples in one frame.
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#define SSC_DATNB(samples) ((samples -1) << 8)
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/// Calculates the value of the FSLEN field of the Transmit Frame Mode Register
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/// of an SSC interface, given the number of transmit clock periods that the
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/// frame sync signal should take.
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#define SSC_FSLEN(periods) ((periods - 1) << 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 SSC_Configure(AT91S_SSC *ssc,
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unsigned int id,
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unsigned int bitRate,
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unsigned int masterClock);
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extern void SSC_ConfigureTransmitter(AT91S_SSC *ssc,
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unsigned int tcmr,
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unsigned int tfmr);
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extern void SSC_ConfigureReceiver(AT91S_SSC *ssc,
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unsigned int rcmr,
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unsigned int rfmr);
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extern void SSC_EnableTransmitter(AT91S_SSC *ssc);
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extern void SSC_DisableTransmitter(AT91S_SSC *ssc);
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extern void SSC_EnableReceiver(AT91S_SSC *ssc);
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extern void SSC_DisableReceiver(AT91S_SSC *ssc);
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extern void SSC_EnableInterrupts(AT91S_SSC *ssc, unsigned int sources);
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extern void SSC_DisableInterrupts(AT91S_SSC *ssc, unsigned int sources);
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extern void SSC_Write(AT91S_SSC *ssc, unsigned int frame);
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extern unsigned char SSC_WriteBuffer(AT91S_SSC *ssc,
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void *buffer,
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unsigned int length);
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extern unsigned int SSC_Read(AT91S_SSC *ssc);
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extern unsigned char SSC_ReadBuffer(AT91S_SSC *ssc,
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void *buffer,
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unsigned int length);
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#endif //#ifndef SSC_H
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