study:uds:250808-01:index
CAN Wake-Up Pattern (2025-080-08)
Local Backup
- PDF - WUP_wake_up_concept_Prague_2015.PDF
Notes
- 針對 Classical CAN 與 CAN-FD 所提出的可用 Wake-up Pattern：
| Frame 格式 | 簡稱 | WUP 序列 | 備註 |
|---|---|---|---|
| Classical CAN Base Frame | CBFF | 1. RTR, IDE, FDF 位元皆 Dominant 2. EOF（Recessive） 3. 再次 RTR, IDE, FDF Dominant | Dominant 脈衝 ≥ 5 µs； Recessive 脈衝 ≥ 5 µs WUP_wake_up_concept_Pra… |
| Classical CAN Ext. Frame | CEFF | 1. RTR, IDE, FDF, r0 位元 Dominant 2. EOF（Recessive） 3. 再次 RTR, IDE, FDF, r0 Dominant | 同上 |
| CAN-FD Base Frame | FBFF | 1. BRS + IDE 位元 Dominant 2. EOF（Recessive） 3. 再次 BRS + IDE Dominant | bit rate ≤ 400 kb/s； 需使用短濾波時間（tFilter_short） WUP_wake_up_concept_Pra… |
| CAN-FD Ext. Frame | FEFF | 1. RRS 或 res 位元 Dominant 2. EOF（Recessive） 3. 再次 RRS 或 res Dominant | bit rate ≤ 200 kb/s； 僅 RRS/res 可保證 Dominant |
- 註：
- Dominant／Recessive 條件判別均依 ISO 11898-2 (ed. 2016) 中的 CAN activity filter time (long: 0.5…5 µs, short: 0.15…1.8 µs)。
- CAN-FD 在高於上述速率時可透過設定 tFilter_short 與 tWake_long 參數來維持 WUP 機制穩定。
Refernece Code
- 下面範例示範了如何在 PCAN-Basic for C# 中，依序送出四種 Wake-Up Pattern：
- CBFF – Classical CAN Base Frame (Standard ID, no FD, no bitrate switch)
- CEFF – Classical CAN Extended Frame (Extended ID, no FD, no bitrate switch)
- FBFF – CAN-FD Base Frame (Standard ID, FD frame, bitrate switch)
- FEFF – CAN-FD Extended Frame (Extended ID, FD frame, bitrate switch)
- Code:
using System; using Peak.Can.Basic; using TPCANHandle = System.Byte; // or UInt16 depending on API wrapper using TPCANMsg = Peak.Can.Basic.TPCANMsg; using TPCANMsgFD = Peak.Can.Basic.TPCANMsgFD; using TPCANBaudrate = Peak.Can.Basic.TPCANBaudrate; using TPCANType = Peak.Can.Basic.TPCANType; using TPCANMessageType = Peak.Can.Basic.TPCANMessageType; class CanWakeupPatterns { const TPCANHandle Channel = TPCANHandle.PCAN_USBBUS1; static void Main() { // 1. 初始化 CAN 通道 var status = PCANBasic.Initialize(Channel, TPCANBaudrate.PCAN_BAUD_500K, TPCANType.PCAN_TYPE_ISA); if (status != TPCANStatus.PCAN_ERROR_OK) { Console.WriteLine("初始化失敗: " + status); return; } // 2. 送出 CBFF (Standard frame) var stdMsg = new TPCANMsg { ID = 0x100, // Example standard ID LEN = 0, // DLC = 0 MSGTYPE = TPCANMessageType.PCAN_MESSAGE_STANDARD // Standard, no RTR }; PCANBasic.Write(Channel, ref stdMsg); // 3. 送出 CEFF (Extended frame) var extMsg = new TPCANMsg { ID = 0x1ABCDEF0, // Example extended ID LEN = 0, MSGTYPE = TPCANMessageType.PCAN_MESSAGE_EXTENDED // Extended frame }; PCANBasic.Write(Channel, ref extMsg); // 4. 送出 FBFF (FD standard frame, with bitrate switch) var fdStd = new TPCANMsgFD { ID = 0x100, // Example standard ID DLC = 0, // Length = 0 MSGTYPE = TPCANMessageType.PCAN_MESSAGE_FD // FD frame | TPCANMessageType.PCAN_MESSAGE_STANDARD // Standard ID | TPCANMessageType.PCAN_MESSAGE_BITRATEFAST // Enable BRS }; PCANBasic.WriteFD(Channel, ref fdStd); // 5. 送出 FEFF (FD extended frame, with bitrate switch) var fdExt = new TPCANMsgFD { ID = 0x1ABCDEF0, // Example extended ID DLC = 0, MSGTYPE = TPCANMessageType.PCAN_MESSAGE_FD // FD frame | TPCANMessageType.PCAN_MESSAGE_EXTENDED // Extended ID | TPCANMessageType.PCAN_MESSAGE_BITRATEFAST // Enable BRS }; PCANBasic.WriteFD(Channel, ref fdExt); // 6. 最後記得釋放通道 PCANBasic.Uninitialize(Channel); } } - Classic CAN 用 TPCANMsg + PCANBasic.Write。
- PCAN_MESSAGE_STANDARD ⇒ CBFF
- PCAN_MESSAGE_EXTENDED ⇒ CEFF
- CAN-FD 用 TPCANMsgFD + PCANBasic.WriteFD，並在 MSGTYPE 中加上：
- PCAN_MESSAGE_FD
- PCAN_MESSAGE_BITRATEFAST (BRS)
- 加上 PCAN_MESSAGE_STANDARD 或 PCAN_MESSAGE_EXTENDED 以選擇 ID 格式 ⇒ 分別對應 FBFF/FEFF。
- 把範例中的 ID 換成真正要用的識別碼，就能發出對應的 Wake-Up Pattern 了。
Reference
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study/uds/250808-01/index.txt · Last modified: 2025/08/08 08:27 by jethro
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