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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35 /// This module provides definitions and functions for using the AC'97
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36 /// controller (AC97C).
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40 /// -# Enable the AC'97 interface pins (see pio & board.h).
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41 /// -# Configure the AC'97 controller using AC97C_Configure
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42 /// -# Assign the input and output slots to channels, and the data size used to
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43 /// transfer AC97 data stream.
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44 /// - Three functions can be used:
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45 /// - AC97C_AssignInputSlots: set slots for AC'97 data in, recording.
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46 /// - AC97C_AssignOutputSlots: set slots for AC'97 data out, playing.
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47 /// - AC97C_SetChannelSize: set data sizes in bits for AC'97 data stream.
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48 /// - Three different channels can be configured:
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49 /// - AC97C_CHANNEL_CODEC: AC'97 register access channel, its size is
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50 /// fixed and #must not# change by AC97C_SetChannelSize
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51 /// - AC97C_CHANNEL_A: AC'97 stream channel, with PDC support.
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52 /// - AC97C_CHANNEL_B: AC'97 data channel, without PDC support.
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53 /// -# Configure the used AC97 channel with AC97C_ConfigureChannel, to enable
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55 /// -# Then you can operate the connected AC'97 codec:
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56 /// - AC97C_ReadCodec / AC97C_WriteCodec: Read / Write codec register.
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57 /// - AC97C_Transfer: Transfer through AC97C channels to setup codec register
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58 /// or transfer %audio data stream.
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59 /// - AC97C_CODEC_TRANSFER: access the codec register.
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60 /// - AC97C_CHANNEL_A_RECEIVE, AC97C_CHANNEL_B_RECEIVE: start reading.
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61 /// - AC97C_CHANNEL_A_TRANSMIT, AC97C_CHANNEL_B_TRANSMIT: start writing.
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62 /// Normally you can initialize a set of AC'97 codec registers to initialize
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63 /// the codec for %audio playing and recording.
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64 /// -# Example code for playing & recording:
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65 /// - General process:
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66 /// -# Configure the codec registers for the %audio settings and formats;
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67 /// -# Setup the channel size if necessery;
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68 /// -# Start %audio stream transfer.
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69 /// - Audio playing sample:
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71 /// // Configure sample rate of codec
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72 /// AC97C_WriteCodec(AD1981B_PMC_DAC, expectedSampleRate);
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73 /// // Set channel size
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74 /// AC97C_SetChannelSize(AC97C_CHANNEL_A, bitsPerSample);
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75 /// // Start channel A transfer
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76 /// AC97C_Transfer(AC97C_CHANNEL_A_TRANSMIT,
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77 /// (unsigned char *) (pointerToAudioDataBuffer),
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78 /// numberOfSamplesToSend,
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79 /// (Ac97Callback) PlayingFinished,
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82 /// - Audio recording sample:
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84 /// // Enable recording
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85 /// AC97C_WriteCodec(AD1981B_REC_SEL, 0);
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86 /// // Set sample rate
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87 /// AC97C_WriteCodec(AD1981B_PMC_ADC, 7000);
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88 /// // Always use 16-bits recording
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89 /// AC97C_SetChannelSize(AC97C_CHANNEL_A, 16);
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90 /// // Start recording
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91 /// AC97C_Transfer(AC97C_CHANNEL_A_RECEIVE,
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92 /// (unsigned char *) RECORD_ADDRESS,
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93 /// MAX_RECORD_SIZE,
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94 /// (Ac97Callback) RecordFinished,
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97 //------------------------------------------------------------------------------
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102 //------------------------------------------------------------------------------
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104 //------------------------------------------------------------------------------
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106 /// The channel is already busy with a transfer.
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107 #define AC97C_ERROR_BUSY 1
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108 /// The transfer has been stopped by the user.
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109 #define AC97C_ERROR_STOPPED 2
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111 /// Codec channel index.
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112 #define AC97C_CHANNEL_CODEC 0
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113 /// Channel A index.
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114 #define AC97C_CHANNEL_A 1
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115 /// Channel B index.
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116 #define AC97C_CHANNEL_B 2
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118 /// Codec transmit/receive transfer index.
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119 #define AC97C_CODEC_TRANSFER 0
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120 /// Channel A receive transfer index.
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121 #define AC97C_CHANNEL_A_RECEIVE 1
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122 /// Channel A transmit transfer index.
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123 #define AC97C_CHANNEL_A_TRANSMIT 2
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124 /// Channel B receive transfer index.
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125 #define AC97C_CHANNEL_B_RECEIVE 3
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126 /// Channel B transmit transfer index.
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127 #define AC97C_CHANNEL_B_TRANSMIT 4
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129 //------------------------------------------------------------------------------
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131 //------------------------------------------------------------------------------
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133 /// AC97C transfer callback function.
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134 typedef void (*Ac97Callback)(void *pArg,
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135 unsigned char status,
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136 unsigned int remaining);
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138 //------------------------------------------------------------------------------
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139 // Exported functions
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140 //------------------------------------------------------------------------------
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142 extern void AC97C_Configure();
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144 extern void AC97C_ConfigureChannel(unsigned char channel, unsigned int cfg);
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146 extern void AC97C_AssignInputSlots(unsigned char channel, unsigned int slots);
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148 extern void AC97C_AssignOutputSlots(unsigned char channel, unsigned int slots);
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150 extern unsigned char AC97C_Transfer(
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151 unsigned char channel,
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152 unsigned char *pBuffer,
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153 unsigned int numSamples,
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154 Ac97Callback callback,
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157 extern unsigned char AC97C_IsFinished(unsigned char channel);
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159 extern void AC97C_WriteCodec(unsigned char address, unsigned short data);
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161 extern unsigned short AC97C_ReadCodec(unsigned char address);
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163 extern void AC97C_SetChannelSize(unsigned char channel, unsigned char size);
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165 extern void AC97C_CancelTransfer(unsigned char channel);
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167 #endif //#ifndef AC97C_H
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