苹果MFi配件固件规范R42解读

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"MFi Accessory Firmware Specification R42.pdf" 苹果的MFi（Made for iPhone/iPod/iPad）配件固件规范是针对第三方开发者设计和制造与苹果设备兼容的配件时的重要指南。这份文档详细阐述了如何遵循ipod协议来开发接口软件，确保设备能够无缝集成到苹果的生态系统中。在MFi Accessory Firmware Specification R42中，开发者可以找到关于以下关键知识点的信息： 1. **协议标准**：文档详细描述了苹果设备与外部配件之间的通信协议，包括物理层（如接口引脚定义）、数据传输层（如USB协议的特定实现）以及应用层协议（如如何进行设备认证和权限管理）。 2. **安全与认证**：苹果对MFi配件有严格的认证流程，以确保产品的质量和用户数据的安全。开发者需要了解如何在硬件和固件层面实现这些安全措施，包括加密、数字签名和安全启动过程。 3. **硬件接口**：文档涵盖了苹果设备连接器的电气规格和机械尺寸，帮助开发者设计出符合苹果标准的物理接口。 4. **软件开发工具和流程**：为了与苹果设备通信，开发者需要使用特定的API和开发工具。此文档会提供这些工具的使用指南，以及固件开发、调试和测试的步骤。 5. **版权和法律事项**：苹果对商标和知识产权有严格的保护政策。开发者必须遵循规定，如仅限个人用途存储和打印文档，未经许可不得用于商业目的，以及如何正确使用苹果的商标等。 6. **错误处理和故障排查**：文档还会包含错误代码和故障排查指南，帮助开发者解决在开发过程中可能遇到的问题。 7. **兼容性**：确保配件与各种苹果设备（如不同型号的iPhone、iPad和iPod）的兼容性是关键。开发者需要理解如何进行设备检测和版本匹配，以确保其产品在各种环境下都能正常工作。 8. **更新机制**：随着苹果系统的升级，配件的固件也需要相应更新。文档将解释如何实现固件的远程更新和维护。 9. **用户体验**：苹果重视用户体验，因此配件的交互设计和功能实现都应遵循苹果的设计原则，以提供一致且优质的用户体验。 10. **技术支持和资源**：苹果通常会提供技术支持和开发社区资源，帮助开发者解决问题和获取最新信息。 MFi Accessory Firmware Specification R42是开发苹果配件的核心参考文档，它为开发者提供了全面的技术指导和法律框架，以确保配件与苹果设备的无缝集成和合规操作。

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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苹果MFi配件固件规范R42解读

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