R42 MFi Accessory固件规范：IAP协议开发指南

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MFi Accessory Firmware Specification R42 是由 Apple Inc. 在 2010 年发布的一份技术文档，主要针对开发和管理与 Apple MFi 认证兼容附件（如耳机、键盘、游戏控制器等）的固件。这份规格提供了详细的指导，旨在确保第三方开发者遵循苹果的硬件和软件兼容性标准，以确保产品能够无缝融入 Apple 生态系统。该文档的核心内容包括但不限于： 1. **版本更新** - R42 版本可能包含了对先前版本的改进和新功能的添加，以适应不断变化的技术环境和用户需求。 2. **版权和使用条款** - 用户必须遵守严格的版权规定，不得复制或传输文档内容，除非获得 Apple 的书面许可，且仅限于个人使用。此外，使用特定的 Apple 商标（如 Apple logo 和 "keyboard" logo）进行商业用途需经 Apple 预先同意，以避免商标侵权和不公平竞争。 3. **许可限制** - 文档中描述的技术并未授予任何许可证，所有知识产权仍归 Apple 所有。这意味着开发者只能在遵守苹果授权的前提下使用这些技术。 4. **准确性与完整性** - Apple 已尽力确保文档中的信息准确无误，但用户在实施时仍需自行验证，并可能需要配合官方技术支持和更新。 5. **技术细节** - 此文档详细列出了 MFi 认证附件固件设计的规范，涵盖了硬件接口、通信协议（如 IAP，即 In-App Purchase，应用内购）以及安全和认证流程。开发者需要遵循这些规范来实现与 Apple 设备的兼容性和互操作性。 6. **适配性和兼容性** - MFi Accessory Firmware Specification R42 旨在确保附件产品能够与 iOS、iPadOS、macOS 等 Apple 操作系统的最新版本兼容，从而提供一致的用户体验。 MFi Accessory Firmware Specification R42 是一项关键资源，对于希望进入 Apple 生态系统并生产高质量配件的开发者来说，它是必不可少的参考和技术指南。通过遵循此规范，开发者能够确保他们的产品不仅符合苹果的质量标准，还能为用户提供无缝的使用体验，同时保护了苹果的品牌和知识产权。

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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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