PEAK-System Forum

Hello,

I'm trying to use CANTP_AddMapping function for target type functional.
According to my ECU specification :
CAN Broadcast id : 0x223
CAN tester id : 0x12B

First I wrote the following code :

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        TPUDSStatus resultMap = CANTP_AddMapping(PCANTP_USBBUS1, //CanChannel
                                                 0x223, //canID
                                                 CAN_ID_NO_MAPPING, //canIDResponse
                                                 PCANTP_ID_CAN_11BIT, // canIdType
                                                 PCANTP_FORMAT_NORMAL, //formatType
                                                 PCANTP_MESSAGE_DIAGNOSTIC, // msgType
                                                 PUDS_SERVER_ADDR_TEST_EQUIPMENT, //sourceAddr
                                                 0xF5, // targetAddr
                                                 PCANTP_ADDRESSING_FUNCTIONAL, //targetType
                                                 0x00 // remoteAddr
                                                 );
...
        resultMap = CANTP_AddMapping(PCANTP_USBBUS1, //CanChannel
                                     0x12B, //canID
                                     CAN_ID_NO_MAPPING, //canIDResponse
                                     PCANTP_ID_CAN_11BIT, // canIdType
                                     PCANTP_FORMAT_NORMAL, //formatType
                                     PCANTP_MESSAGE_DIAGNOSTIC, // msgType
                                     0xF5, //sourceAddr
                                     PUDS_SERVER_ADDR_TEST_EQUIPMENT, // targetAddr
                                     PCANTP_ADDRESSING_PHYSICAL, //targetType
                                     0x00 // remoteAddr
                                     );

To use it, I just wrote UDS_SvcReadDataByIdentifier and UDS_WaitForServiceFunctional with the parameter request.NETADDRINFO.TA = 0xF5;

I got the following CAN communication

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;   Message Number
;   |         Time Offset (ms)
;   |         |        Type
;   |         |        |        ID (hex)
;   |         |        |        |     Data Length
;   |         |        |        |     |   Data Bytes (hex) ...
;   |         |        |        |     |   |
;---+--   ----+----  --+--  ----+---  +  -+ -- -- -- -- -- -- --
     1)      1403.4  Rx         0111  8  00 00 00 5D 6E 00 00 00 //not relevant
     2)      1949.4  Rx     00000123  8  00 00 00 00 00 00 00 00 //not relevant
     3)      2177.4  Rx         0223  8  03 22 FD 02 FF FF FF FF 
     4)      2179.5  Rx         012B  8  07 62 FD 02 00 00 02 22 
     5)      3950.4  Rx     00000123  8  00 00 00 00 00 00 00 00 //not relevant
     6)      5951.3  Rx     00000123  8  00 00 00 00 00 00 00 00 //not relevant
     7)      6404.2  Rx         0111  8  00 00 00 5D 6E 00 00 00 //not relevant

As expected, the tester equipment sent on 0x223 and the ECU answered on 0x12B
But, my second mapping is wrong because I can get the answer from the ECU
After some modification, the best I can catch is the request from the tester itself

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"UDS REQUEST from 0xF1 (to 0xF5, with RA 0x0) - result: 0 - OK !\n"
"     -> Length: 3, Data= 22 FD 02"

So due to my wrong mapping the tester ignore the ECU answer.
Could you explain me how to fix this?
Thank you in advance.
Best regards
Alexis

Hello Alexis,

The ECU response is physically addressed to the tester present so you need to specify the "CAN ID response" of the internal ISO-TP communication: behind the scene there are more than a single request and a single response, the messages are fragmented in several CAN frames.

To sum up:
1. the tester present "speaks" with listening ECUs on CAN ID 0x223 (it is a one-way communication),
2. ECU #0xF5 "speaks" with the tester present on CAN ID 0x12B,
3. the tester responds to ECU #0xF5 with CAN ID ??? (telling stuff about how to transmit),
4. ECU #0xF5 continue to speaks with the tester present on CAN ID 0x12B
5. if the message is quite big and depending on parameters, go back to 3 until message is fully transmitted.

So when you define the mapping, you need to change the canIdResponse value "CAN_ID_NO_MAPPING" to a correct ID (check the specification of your ECU, it corresponds to the physical request from Tester Present to the ECU):

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  resultMap = CANTP_AddMapping(PCANTP_USBBUS1, //CanChannel
                                     0x12B, //canID
                                     ????????, //canIDResponse
                                     PCANTP_ID_CAN_11BIT, // canIdType
                                     PCANTP_FORMAT_NORMAL, //formatType
                                     PCANTP_MESSAGE_DIAGNOSTIC, // msgType
                                     0xF5, //sourceAddr
                                     PUDS_SERVER_ADDR_TEST_EQUIPMENT, // targetAddr
                                     PCANTP_ADDRESSING_PHYSICAL, //targetType
                                     0x00 // remoteAddr
                                     );

Also note that this will define an automatic response mapping: tester present will only be able to respond to requests. But if you later need to send a physical request from TesterPresent to ECU#0xF5, you have to define another mapping:

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  resultMap = CANTP_AddMapping(PCANTP_USBBUS1, //CanChannel
                                     ????????, //canID
                                     0x12B, //canIDResponse
                                     PCANTP_ID_CAN_11BIT, // canIdType
                                     PCANTP_FORMAT_NORMAL, //formatType
                                     PCANTP_MESSAGE_DIAGNOSTIC, // msgType
                                     PUDS_SERVER_ADDR_TEST_EQUIPMENT, //sourceAddr
                                     0xF5, // targetAddr
                                     PCANTP_ADDRESSING_PHYSICAL, //targetType
                                     0x00 // remoteAddr
                                     );

Ok thank you for the fast answer, I will try to find the missing CAN id.

Best regards
Alexis

EDIT : I got the information and it works. Thank you very much for the help

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