1 /* ----------------------------------------------------------------------------
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2 * ATMEL Microcontroller Software Support
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3 * ----------------------------------------------------------------------------
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4 * Copyright (c) 2008, Atmel Corporation
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6 * All rights reserved.
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions are met:
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11 * - Redistributions of source code must retain the above copyright notice,
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12 * this list of conditions and the disclaimer below.
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14 * Atmel's name may not be used to endorse or promote products derived from
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15 * this software without specific prior written permission.
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17 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
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18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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20 * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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23 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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24 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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25 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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26 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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27 * ----------------------------------------------------------------------------
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30 //------------------------------------------------------------------------------
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34 /// Set of functions and definition for using a SSC peripheral.
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38 /// -# Enable the SSC interface pins (see pio & board.h).
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39 /// -# Configure the SSC to operate at a specific frequency by calling
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40 /// SSC_Configure(). This function enables the peripheral clock of the SSC,
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41 /// but not its PIOs.
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42 /// -# Configure the transmitter and/or the receiver using the
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43 /// SSC_ConfigureTransmitter() and SSC_ConfigureEmitter() functions.
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44 /// -# Enable the PIOs or the transmitter and/or the received.
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45 /// -# Enable the transmitter and/or the receiver using SSC_EnableTransmitter()
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46 /// and SSC_EnableReceiver()
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47 /// -# Send data through the transmitter using SSC_Write() and SSC_WriteBuffer()
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48 /// -# Receive data from the receiver using SSC_Read() and SSC_ReadBuffer()
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49 /// -# Disable the transmitter and/or the receiver using SSC_DisableTransmitter()
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50 /// and SSC_DisableReceiver()
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51 //------------------------------------------------------------------------------
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56 //------------------------------------------------------------------------------
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58 //------------------------------------------------------------------------------
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62 //------------------------------------------------------------------------------
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64 //------------------------------------------------------------------------------
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66 //------------------------------------------------------------------------------
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67 /// \page "SSC configuration macros"
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68 /// This page lists several macros which are used when configuring a SSC
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78 /// Calculates the value of the STTDLY field given the number of clock cycles
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79 /// before the first bit of a new frame is transmitted.
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80 #define SSC_STTDLY(bits) (bits << 16)
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82 /// Calculates the value of the PERIOD field of the Transmit Clock Mode Register
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83 /// of an SSC interface, given the desired clock divider.
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84 #define SSC_PERIOD(divider) (((divider / 2) - 1) << 24)
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86 /// Calculates the value of the DATLEN field of the Transmit Frame Mode Register
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87 /// of an SSC interface, given the number of bits in one sample.
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88 #define SSC_DATLEN(bits) (bits - 1)
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90 /// Calculates the value of the DATNB field of the Transmit Frame Mode Register
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91 /// of an SSC interface, given the number of samples in one frame.
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92 #define SSC_DATNB(samples) ((samples -1) << 8)
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94 /// Calculates the value of the FSLEN field of the Transmit Frame Mode Register
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95 /// of an SSC interface, given the number of transmit clock periods that the
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96 /// frame sync signal should take.
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97 #define SSC_FSLEN(periods) ((periods - 1) << 16)
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98 //------------------------------------------------------------------------------
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100 //------------------------------------------------------------------------------
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101 // Exported functions
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102 //------------------------------------------------------------------------------
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103 extern void SSC_Configure(AT91S_SSC *ssc,
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105 unsigned int bitRate,
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106 unsigned int masterClock);
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107 extern void SSC_ConfigureTransmitter(AT91S_SSC *ssc,
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109 unsigned int tfmr);
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110 extern void SSC_ConfigureReceiver(AT91S_SSC *ssc,
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112 unsigned int rfmr);
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114 extern void SSC_EnableTransmitter(AT91S_SSC *ssc);
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115 extern void SSC_DisableTransmitter(AT91S_SSC *ssc);
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116 extern void SSC_EnableReceiver(AT91S_SSC *ssc);
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117 extern void SSC_DisableReceiver(AT91S_SSC *ssc);
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119 extern void SSC_EnableInterrupts(AT91S_SSC *ssc, unsigned int sources);
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120 extern void SSC_DisableInterrupts(AT91S_SSC *ssc, unsigned int sources);
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122 extern void SSC_Write(AT91S_SSC *ssc, unsigned int frame);
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123 extern unsigned char SSC_WriteBuffer(AT91S_SSC *ssc,
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125 unsigned int length);
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126 extern unsigned int SSC_Read(AT91S_SSC *ssc);
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127 extern unsigned char SSC_ReadBuffer(AT91S_SSC *ssc,
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129 unsigned int length);
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131 #endif //#ifndef SSC_H
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