我用MK24F12。我调整了 Flexcan 模块以使用车队管理系统接口从设备收集消息。我打开了 RxFIFO 并将 ID 接受模式设置为格式 A。然后我用 ID 填充过滤表（它从第 7 个邮箱开始），并根据 RXIMR 寄存器用掩码填充。我用 0x40000000 填充其余过滤器，用 0x5FFFFFFF 填充其余掩码寄存器。当我开始收听设备时，我得到了一些帧，但问题是我没有收到设备发送的所有消息，尽管它们匹配过滤器。我知道，因为如果我将任何掩码寄存器设置为零，我会在总线上收到所有消息。我注意到命中过滤器（RXFIR 寄存器）是（0,1,4,5,...），所以换句话说，我得到的消息与存储在 MailBox 的寄存器 CSn 和 IDn 中的过滤器匹配。
下面是日志，在这里我添加了 7 个过滤器，我只收到了 4 种类型的消息。然后我删除了所有过滤器，如您所见，我跳过了很多应该被捕获的消息。
[1.003] Filter added (Type: Ext, ID: 0x00FEE900, Mask: 0x00FFFF00)
[1.004] Filter added (Type: Ext, ID: 0x00FEFC00, Mask: 0x00FFFF00)
[1.005] Filter added (Type: Ext, ID: 0x00FEEE00, Mask: 0x00FFFF00)
[1.006] Filter added (Type: Ext, ID: 0x00FEC100, Mask: 0x00FFFF00)
[1.007] Filter added (Type: Ext, ID: 0x00F00400, Mask: 0x00FFFF00)
[1.008] Filter added (Type: Ext, ID: 0x00FEE500, Mask: 0x00FFFF00)
[1.008] Filter added (Type: Ext, ID: 0x00FEEA00, Mask: 0x00FFFF00)
[1.935] CAN.Got frame (Type: Ext, ID: 0x18F00420, Data: FF FF FF 80 0C FF FF FF, Filter: 4)
[2.436] CAN.Got frame (Type: Ext, ID: 0x18FEE520, Data: 58 1C 00 00 FF FF FF FF, Filter: 5)
[2.938] CAN.Got frame (Type: Ext, ID: 0x18FEE920, Data: FF FF FF FF 59 1C 00 00, Filter: 0)
[3.439] CAN.Got frame (Type: Ext, ID: 0x18FEFC20, Data: FF 48 FF FF FF FF FF FF, Filter: 1)
[4.944] CAN.Got frame (Type: Ext, ID: 0x18F00420, Data: FF FF FF C0 12 FF FF FF, Filter: 4)
[5.445] CAN.Got frame (Type: Ext, ID: 0x18FEE520, Data: 59 1C 00 00 FF FF FF FF, Filter: 5)
[6.950] CAN.Got frame (Type: Ext, ID: 0x18FEE920, Data: FF FF FF FF 5A 1C 00 00, Filter: 0)
[7.452] CAN.Got frame (Type: Ext, ID: 0x18FEFC20, Data: FF 46 FF FF FF FF FF FF, Filter: 1)
[8.957] CAN.Got frame (Type: Ext, ID: 0x18F00420, Data: FF FF FF 00 19 FF FF FF, Filter: 4)
[9.458] CAN.Got frame (Type: Ext, ID: 0x18FEE520, Data: 5A 1C 00 00 FF FF FF FF, Filter: 5)
at this point i removed all filters
[34.186] CAN.Got frame (Type: Ext, ID: 0x18F00420, Data: FF FF FF 00 4B FF FF FF, Filter: 0)
[34.688] CAN.Got frame (Type: Ext, ID: 0x18FEE520, Data: 62 1C 00 00 FF FF FF FF, Filter: 0)
[35.190] CAN.Got frame (Type: Ext, ID: 0x18FEE920, Data: FF FF FF FF 63 1C 00 00, Filter: 0)
[35.691] CAN.Got frame (Type: Ext, ID: 0x18FEFC20, Data: FF 34 FF FF FF FF FF FF, Filter: 0)
[36.193] CAN.Got frame (Type: Ext, ID: 0x18FEEE20, Data: 56 FF FF FF FF FF FF FF, Filter: 0)
[36.694] CAN.Got frame (Type: Ext, ID: 0x18FEC120, Data: AD 05 00 00 FF FF FF FF, Filter: 0)
[37.196] CAN.Got frame (Type: Ext, ID: 0x18F00420, Data: FF FF FF 40 51 FF FF FF, Filter: 0)
[37.698] CAN.Got frame (Type: Ext, ID: 0x18FEE520, Data: 63 1C 00 00 FF FF FF FF, Filter: 0)
[39.203] CAN.Got frame (Type: Ext, ID: 0x18FEE920, Data: FF FF FF FF 64 1C 00 00, Filter: 0)
[39.704] CAN.Got frame (Type: Ext, ID: 0x18FEFC20, Data: FF 32 FF FF FF FF FF FF, Filter: 0)
[40.206] CAN.Got frame (Type: Ext, ID: 0x18FEEE20, Data: 58 FF FF FF FF FF FF FF, Filter: 0)
[40.707] CAN.Got frame (Type: Ext, ID: 0x18FEC120, Data: AD 05 00 00 FF FF FF FF, Filter: 0)
