R42 MFi accessory firmware规格详解：iPod接口开发必备

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本资源为《MFi Accessory Firmware Specification R42》文档，由Apple Inc.于2010年1月30日发布，是针对iPod接口软件开发的重要参考资料。该文档详细阐述了iPod协议，覆盖了如何设计和制造符合苹果官方认证（Made for iPod, MFi）的附件产品的固件规格。MFi是Apple为确保外设兼容性和用户体验而设立的标准，开发者通过遵循这份规范，可以确保其配件能够无缝连接并工作在iPod设备上。文档的核心内容包括但不限于以下几个方面： 1. **版权和使用规定**：文档强调所有内容受Apple Inc.版权保护，未经书面许可禁止任何形式的复制、存储或传输，除非用于个人使用且保留版权声明。苹果对于其商标，如Apple logo，有严格的使用规范，商业用途需获得苹果书面同意，以避免商标侵权和不公平竞争。 2. **技术许可**：文档中提及的技术不授予任何明示或暗示的许可，意味着开发者在使用这些技术时必须遵守苹果的知识产权政策。 3. **技术细节**：文档详尽地描述了MFi附件固件的设计要求，涵盖了硬件接口、数据传输协议、安全措施以及与iPod设备的交互方式。这部分内容对于开发者来说是关键，他们需要遵循这些指南来确保产品与iPod系列的兼容性，并满足苹果的质量标准。 4. **质量保障**：文档强调了确保提供的信息准确无误的努力，这表明苹果重视与MFi合作伙伴的合作，共同维护用户对优质产品的期望。 5. **个人使用权限**：允许个人在一台计算机上存储文档供个人参考，并打印文档供个人使用，但必须保留版权声明。《MFi Accessory Firmware Specification R42》是一个极其重要的资源，它为想要开发兼容iPod的第三方配件制造商提供了明确的指导和规范，确保了产品的互操作性和安全性。对于任何从事iPod周边设备开发的工程师或公司来说，理解和遵循这份文档中的规则是至关重要的。

Table 2-16 ACK packet reporting dropped data 84

Table 2-17 RequestRemoteUIMode packet 85

Table 2-18 ReturnRemoteUIMode packet 86

Table 2-19 EnterRemoteUIMode packet 87

Table 2-20 ExitRemoteUIMode packet 87

Table 2-21 RequestiPodName packet 88

Table 2-22 ReturniPodName packet 88

Table 2-23 RequestiPodSoftwareVersion packet 89

Table 2-24 ReturniPodSoftwareVersion packet 89

Table 2-25 RequestiPodSerialNum packet 90

Table 2-26 ReturniPodSerialNum packet 90

Table 2-27 RequestiPodModelNum packet 91

Table 2-28 ReturniPodModelNum packet 92

Table 2-29 Apple device model number strings M8948-M9974 and P8948-P9830 92

Table 2-30 Apple device model number strings MA002/PA002 and higher 93

Table 2-31 RequestLingoProtocolVersion packet 98

Table 2-32 ReturnLingoProtocolVersion packet 98

Table 2-33 RequestTransportMaxPacketSize packet 99

Table 2-34 ReturnTransportMaxPacketSize packet 100

Table 2-35 IdentifyDeviceLingoes packet 101

Table 2-36 Device Lingoes Spoken bits 102

Table 2-37 IdentifyDeviceLingoes Options bits 102

Table 2-38 GetDevAuthenticationInfo packet 104

Table 2-39 RetDevAuthenticationInfo packet, Authentication 1.0 104

Table 2-40 RetDevAuthenticationInfo packet, Authentication 2.0 105

Table 2-41 AckDevAuthenticationInfo packet 106

Table 2-42 GetDevAuthenticationSignature packet 107

Table 2-43 RetDevAuthenticationSignature packet 108

Table 2-44 AckDevAuthenticationStatus packet 108

Table 2-45 GetiPodAuthenticationInfo packet 109

Table 2-46 RetiPodAuthenticationInfo packet 109

Table 2-47 AckiPodAuthenticationInfo packet 110

Table 2-48 GetiPodAuthenticationSignature packet 111

Table 2-49 RetiPodAuthenticationSignature packet 112

Table 2-50 AckiPodAuthenticationStatus packet 112

Table 2-51 NotifyiPodStateChange packet 113

Table 2-52 GetiPodOptions packet 114

Table 2-53 RetiPodOptions packet 114

Table 2-54 Accessory Info Type values 116

Table 2-55 GetAccessoryInfo packet with Accessory Info Type = 0x00-0x01, 0x04-0x09, or

0x0B 116

Table 2-56 GetAccessoryInfo packet with Accessory Info Type = 0x03 117

Table 2-57 Accessory Info Type values for RetAccessoryInfo 118

Table 2-58 RetAccessoryInfo packet with Accessory Info Type = 0x00 118

Table 2-59 Accessory info capabilities bit field 119

Table 2-60 RetAccessoryInfo packet with Accessory Info Type = 0x01/0x06/0x07/0x08 120

FIGURES, TABLES, AND LISTINGS

Table 2-61 RetAccessoryInfo packet with Accessory Info Type = 0x03 120

Table 2-62 RetAccessoryInfo packet with Accessory Info Type = 0x04/0x05 121

Table 2-63 RetAccessoryInfo packet with Accessory Info Type = 0x09 121

Table 2-64 RetAccessoryInfo packet with Accessory Info Type = 0x0B 122

Table 2-65 Accessory status values 122

Table 2-66 GetiPodPreferences packet 123

Table 2-67 Apple device preference class and setting IDs 123

Table 2-68 RetiPodPreferences packet 128

Table 2-69 SetiPodPreferences packet 129

Table 2-70 GetUIMode packet 129

Table 2-71 RetUIMode packet 130

Table 2-72 User interface mode values 130

Table 2-73 SetUIMode packet 131

Table 2-74 StartIDPS packet 132

Table 2-75 SetFIDTokenValues packet 133

Table 2-76 FIDTokenValues field format 133

Table 2-77 FIDTokenValues tokens 134

Table 2-78 IdentifyToken format 135

Table 2-79 DeviceOptions bits in IdentifyToken 135

Table 2-80 AccCapsToken format 136

Table 2-81 Accessory capabilities bit values 136

Table 2-82 AccInfoToken format 137

Table 2-83 Accessory Info Type values 137

Table 2-84 Accessory RF certifications 138

Table 2-85 iPodPreferenceToken format 138

Table 2-86 EAProtocolToken format 139

Table 2-87 BundleSeedIDPrefToken format 139

Table 2-88 EAProtocolMetadataToken format 139

Table 2-89 MetadataType values 140

Table 2-90 ScreenInfoToken format 140

Table 2-91 Accessory screen features 141

Table 2-92 RetFIDTokenValueACKs packet 141

Table 2-93 Acknowledgment format for IdentifyToken 142

Table 2-94 Acknowledgment status codes 142

Table 2-95 Acknowledgment format for AccCapsToken 143

Table 2-96 Acknowledgment format for AccInfoToken 143

Table 2-97 Acknowledgment format for IpodPreferenceToken 143

Table 2-98 Acknowledgment format for EAProtocolToken 143

Table 2-99 Acknowledgment format for BundleSeedIDPrefToken 144

Table 2-100 Acknowledgment format for EAProtocolMetadataToken 144

Table 2-101 Acknowledgment format for MicCapsToken 144

Table 2-102 Acknowledgment format for ScreenInfoToken 144

Table 2-103 Acknowledgment status codes 145

Table 2-104 EndIDPS packet 145

Table 2-105 accEndIDPSStatus values 146

Table 2-106 IDPSStatus packet 147

FIGURES, TABLES, AND LISTINGS

Table 2-107 Apple device actions in response to accEndIDPSStatus and IDPS status 147

Table 2-108 OpenDataSessionForProtocol packet 148

Table 2-109 CloseDataSession packet 149

Table 2-110 DevACK packet 150

Table 2-111 DevDataTransfer small packet 151

Table 2-112 DevDataTransfer large packet 152

Table 2-113 iPodDataTransfer small packet 153

Table 2-114 iPodDataTransfer large packet 154

Table 2-115 SetAccStatusNotification packet 155

Table 2-116 RetAccStatusNotification packet 156

Table 2-117 AccessoryStatusNotification packet 157

Table 2-118 Accessory status types 157

Table 2-119 Accessory status parameters (fault) 157

Table 2-120 Accessory fault types 157

Table 2-121 Accessory fault conditions 158

Table 2-122 Sample IDPS process and accessory status notification commands 158

Table 2-123 SetEventNotification packet 160

Table 2-124 Notification bitmask bits 161

Table 2-125 iPodNotification packet for Flow Control Notifications 162

Table 2-126 iPodNotification packet for Radio Tagging Notifications 163

Table 2-127 iPodNotification payload for Radio Tagging notifications 164

Table 2-128 iPodNotification packet for Camera notifications 164

Table 2-129 iPodNotification payload for Camera Notifications 164

Table 2-130 iPodNotification packet for NowPlayingFocusApp notifications 165

Table 2-131 iPodNotification packet for Session Space Available notifications 165

Table 2-132 iPodNotification packet for Database Available notifications 166

Table 2-133 iPodNotification packet for Command Complete notifications 166

Table 2-134 iPodNotification packet for USB Host mode charging notifications 167

Table 2-135 InfoType values for USB Host mode charging notifications 167

Table 2-136 Charging Info values for iPodNotification 168

Table 2-137 GetiPodOptionsForLingo packet 168

Table 2-138 RetiPodOptionsForLingo packet 169

Table 2-139 RetiPodOptionsForLingo option bits 169

Table 2-140 Sample GetiPodOptionsForLingo and RetiPodOptionsForLingo commands 173

Table 2-141 GetEventNotification packet 178

Table 2-142 RetEventNotification packet 179

Table 2-143 GetSupportedEventNotification packet 180

Table 2-144 CancelCommand packet 180

Table 2-145 RetSupportedEventNotification packet 181

Table 2-146 SetAvailableCurrent packet 182

Table 2-147 RequestApplicationLaunch packet 183

Table 2-148 GetNowPlayingFocusApp packet 184

Table 2-149 RetNowPlayingFocusApp packet 184

FIGURES, TABLES, AND LISTINGS

Chapter 3

Accessory Lingoes 187

Figure 3-1 Typical digital audio transactions between an Apple device and an accessory 354

Figure 3-2 A USB host recovers from a CRC16 error 357

Table 3-1 iPod accessory lingoes 187

Table 3-2 Select Apple device command timings 188

Table 3-3 Simple remote lingo command summary 189

Table 3-4 Simple remote lingo support versions 191

Table 3-5 Simple Remote lingo command history 191

Table 3-6 5G nano camera modes and transitions 194

Table 3-7 Suggested accessory feedback indications 195

Table 3-8 iPod camera interface commands 196

Table 3-9 Sample video control commands, accessory on and off 197

Table 3-10 Sample video control commands, iPod on and accessory off 200

Table 3-11 USB HID commands 201

Table 3-12 USB HID Consumer Page controls supported by iOS 201

Table 3-13 Simple Remote lingo accessibility commands 202

Table 3-14 ContextButtonStatus packet 202

Table 3-15 Button states 203

Table 3-16 ACK packet 204

Table 3-17 Command status codes 205

Table 3-18 VideoButtonStatus packet 206

Table 3-19 Video-specific button values 206

Table 3-20 AudioButtonStatus packet 207

Table 3-21 Audio-specific button values 208

Table 3-22 iPodOutButtonStatus packet 209

Table 3-23 iPod Out control locations 210

Table 3-24 iPod Out button status values 210

Table 3-25 RotationInputStatus packet 211

Table 3-26 Wheel types 212

Table 3-27 Rotation directions 212

Table 3-28 Rotation actions 212

Table 3-29 Rotation types 212

Table 3-30 RadioButtonStatus packet 215

Table 3-31 CameraButtonStatus packet 216

Table 3-32 RegisterDescriptor packet 216

Table 3-33 Country codes 217

Table 3-34 SendHIDReportToiPod packet 219

Table 3-35 SendHIDReportToAcc packet 220

Table 3-36 UnregisterDescriptor packet 220

Table 3-37 AccessibilityEvent packet 221

Table 3-38 AccessibilityEvent events and data 221

Table 3-39 GetAccessibilityParameter packet 223

Table 3-40 RetAccessibilityParameter packet 224

Table 3-41 Accessibility parameter types and values 224

Table 3-42 SetAccessibilityParameter packet 225

FIGURES, TABLES, AND LISTINGS

Table 3-43 GetCurrentItemProperty packet 226

Table 3-44 RetCurrentItemProperty packet 226

Table 3-45 Currently selected item property types and values 227

Table 3-46 SetContext packet 228

Table 3-47 User interface contexts 228

Table 3-48 DevACK packet 228

Table 3-49 Display Remote lingo command summary 230

Table 3-50 Display Remote lingo command history 231

Table 3-51 ACK packet 233

Table 3-52 Command result values 233

Table 3-53 GetCurrentEQProfileIndex packet 234

Table 3-54 RetCurrentEQProfileIndex packet 234

Table 3-55 SetCurrentEQProfileIndex packet 235

Table 3-56 GetNumEQProfiles packet 236

Table 3-57 RetNumEQProfiles packet 236

Table 3-58 GetIndexedEQProfileName packet 237

Table 3-59 RetIndexedEQProfileName packet 238

Table 3-60 SetRemoteEventNotification packet 238

Table 3-61 Apple device events 239

Table 3-62 RemoteEventNotification packet 240

Table 3-63 Event notification data 241

Table 3-64 Play status values 245

Table 3-65 Shuffle state 245

Table 3-66 Repeat state 245

Table 3-67 Power and battery state 246

Table 3-68 Audiobook playback speeds 246

Table 3-69 GetRemoteEventStatus packet 247

Table 3-70 RetRemoteEventStatus packet 247

Table 3-71 GetiPodStateInfo packet 248

Table 3-72 infoType values 248

Table 3-73 GetiPodStateInfo packet to retrieve the Apple device Equalizer Setting 249

Table 3-74 RetiPodStateInfo packet 250

Table 3-75 RetiPodStateInfo packet for requesting chapter information 250

Table 3-76 SetiPodStateInfo packet 251

Table 3-77 Apple device state data 252

Table 3-78 Restore-on-exit values 255

Table 3-79 SetiPodStateInfo packet for setting the current track 255

Table 3-80 GetPlayStatus packet 256

Table 3-81 RetPlayStatus packet 257

Table 3-82 SetCurrentPlayingTrack packet 258

Table 3-83 GetIndexedPlayingTrackInfo packet 258

Table 3-84 RetIndexedPlayingTrackInfo packet 259

Table 3-85 Track information data 260

Table 3-86 GetNumPlayingTracks packet 262

Table 3-87 RetNumPlayingTracks packet 262

Table 3-88 GetArtworkFormats packet 263

FIGURES, TABLES, AND LISTINGS

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