PEAK-System Forum

Hello,
When I send the service（UDSApi.SvcRequestDownload_2013） and get the response message（flow control frame)：

18DA33F1 -  8    10 0B 34 00 44 00 01 00
18DAF133 -  8    30 00 00 00 00 00 00 00

but the service send the first frame only and it can not send consecutive frame：

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18DA33F1 -  8    21 00 00 04 00 00 CC CC

What's the problem, please? thanks.

Hello,

could you please post your code when sending the service? Also it is good to know:

API version
If you are communicating with an ECU or if you are simulating it

Please check my code, thanks. ( PCAN-UDS 2.x API)
I am communicating with an ECU.

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  	    // Define TimeOuts
            dw_buffer = CanTpApi.PCANTP_ISO_TIMEOUTS_15765_4;
            status = UDSApi.SetValue_2013(client_handle, uds_parameter.PUDS_PARAMETER_ISO_TIMEOUTS, ref dw_buffer, sizeof(UInt32));
            Console.WriteLine("=========Set ISO 15765-4 timeouts values: {0}", (int)status);
            
           // Define Network Address Information used for all the tests
            config.can_id = (UInt32)0xFFFFFFFF;
            config.can_msgtype = cantp_can_msgtype.PCANTP_CAN_MSGTYPE_EXTENDED;
            config.nai.protocol = uds_msgprotocol.PUDS_MSGPROTOCOL_ISO_15765_2_29B_FIXED_NORMAL;
            config.nai.target_type = cantp_isotp_addressing.PCANTP_ISOTP_ADDRESSING_PHYSICAL;
            config.type = uds_msgtype.PUDS_MSGTYPE_USDT;
            config.nai.source_addr = (UInt16)uds_address.PUDS_ADDRESS_ISO_15765_4_ADDR_TEST_EQUIPMENT; //0xF1
            config.nai.target_addr = (UInt16)uds_address.PUDS_ADDRESS_ISO_15765_4_ADDR_ECU_1; //0x33
            int MemoryStartAddress = 0x00010000;      
            int MemorySize = 0x00040000;       
            
           //******************************************
           
            uds_msg request = new uds_msg();
            uds_msg response = new uds_msg();
            uds_msg confirmation = new uds_msg();

            byte[] lBufferMemAddr = BitConverter.GetBytes(startAddress).Reverse().ToArray();
            byte[] lBufferMemSize = BitConverter.GetBytes(dataLength).Reverse().ToArray();         
           
            log.Info("*** UDS Service: RequestDownload ***");

            byte compressionMethod = 0x00; // No Compression
            byte encryptionMethod = 0x00; // No Encryption

            Console.WriteLine(); Console.WriteLine(); Console.WriteLine("*** UDS Service: RequestDownload ***");

            status = UDSApi.SvcRequestDownload_2013(channel, config, out request, 0x00, 0x00, lBufferMemAddr, (byte)lBufferMemAddr.Length, lBufferMemSize, (byte)lBufferMemSize.Length);

Hello,

Here are changes made to your code so that we were able to successfully complete the UDS request:

In the following, the target address was 0x01 instead of 0x33:

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            config.nai.target_addr = 0x33;  // uds_address.PUDS_ADDRESS_ISO_15765_4_ADDR_ECU_1 is actually 0x01

In the following, a variable "channel" was used instead of "client_handle":

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            status = UDSApi.SvcRequestDownload_2013(client_handle, config, out request, 0x00, 0x00, lBufferMemAddr, (byte)lBufferMemAddr.Length, lBufferMemSize, (byte)lBufferMemSize.Length);

If the Consecutive frame is not sent by the API, this means that a network error may have occured. Please check:
1. the return status of the function SvcRequestDownload_2013,
2. the return status of the "wait for service" function (and in case of an error the network result of the request_confirmation):

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            status = UDSApi.WaitForService_2013(client_handle, ref request, out response, out request_confirmation);

Also note that since you are configuring the API to check against OBD2 timeouts, be careful that the ECU must reply its FC frame before 75ms.

Hello, thank you for your help!

1） <the target address was 0x01 instead of 0x33”>
I've changed the content here ：“PUDS_ADDRESS_ISO_15765_4_ADDR_ECU_1 = 0x33 ”

2） <a variable "channel" was used instead of "client_handle">
You are right. This is an error in the code I posted

3) I added the function code of of the function SvcRequestDownload_2013:

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 status = UDSApi.SvcRequestDownload_2013(channel, config, out request, 0x00, 0x00, lBufferMemAddr, (byte)lBufferMemAddr.Length, lBufferMemSize, (byte)lBufferMemSize.Length);               

            if (UDSApi.StatusIsOk_2013(status))
                status = UDSApi.WaitForService_2013(channel, ref request, out response, out confirmation);
            Console.WriteLine(" UDS_SvcRequestDownload_2013: {0}", (int)status);
            if (UDSApi.StatusIsOk_2013(status))
                display_uds_msg(ref confirmation, ref response, false);
            else
                display_uds_msg_request(ref request, false);

            // Free messages
            status = UDSApi.MsgFree_2013(ref request);
            Console.WriteLine(" Free request message: {0}", (int)status);
            status = UDSApi.MsgFree_2013(ref response);
            Console.WriteLine(" Free response message: {0}", (int)status);
            status = UDSApi.MsgFree_2013(ref confirmation);
            Console.WriteLine(" Free confirmation message: {0}", (int)status);

Program run result and he Consecutive frame is not sent by the API.
As shown below message:

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11:01:09:0640 Rx 1 0x18DA33F1 x 8 10 0B 34 00 44 00 01 00 
11:01:09:0644 Rx 1 0x18DAF133 x 8 30 10 05 FF 00 00 B2 00 
11:01:09:0658 Rx 1 0x18DAF133 x 8 30 00 00 55 55 55 55 55

Console:

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*** UDS Service: RequestDownload ***
 UDS_SvcRequestDownload_2013: 654311424

UDS request from 0x00F1 (to 0x0033, with extension address 0x00) - result: 0 - OK !
-> Length: 11, Data= 34 00 44 00 01 00 00 00 04 00 00

 /!\ ERROR: NO UDS RESPONSE !!
 Free request message: 0
 Free response message: 0
 Free confirmation message: 0

4) If I add code of "PCANBasic.Write(PCANBasic.PCAN_USBBUS1, ref CANMsg)" to send Consecutive frame, then the ECU can give positive feedback.

Please check you are using the latest version of PCAN-ISO-TP: v3.4.0 or later.
Your ECU sends a Flow Control frame with a non constant padding value which was considered as an invalid ISOTP FC frame prior v3.3 (see https://www.peak-system.com/PCAN-ISO-TP ... .html?&L=1).
This feature is disabled by default on v3.3+.

You can see that the returned status is 654311424 => 0x27000000 which is PUDS_STATUS_SERVICE_TX_ERROR: an error occured during the transmission of the ISOTP message.
You could get more information by checking the ISOTP network result in "request_confirmation.msg.Msgdata_any_Copy.netstatus".

You are right. It's OK now! Thanks!

Topic closed

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