i am writing candata on kvaser canking the canwrite method can write.

Question

i am writing candata on kvaser canking the canwrite method can write only 1 hex value but i need to write 3 hex values. is there any other methgod for that.

Canlib.canWrite(int handle,int id,byte[] msg ,int dlc,int flag) this is my method.now i want to give 3 hex deciamls instead of id but it is not accepting.isd there any way?

Thanks!

Naveen

Naveen · Answer

Hi sachin , please go through my code, can you tell me where i did wrong ? i am getting id as 7,1F801,02 INSTEAD OF 2,1F801,7F. i am thinking there is wrong in left shift operator. // This tutorial walks you through how to open a channel and send a CAN message on it. using System; using canlibCLSNET; using System.Threading; namespace CanData05 { class Program { private static int HexConvert(string z) { int m = Convert.ToInt32(z, 2); return m; } private static void DumpMessageLoop(int handle) { Canlib.canStatus status; bool finished = false; byte[] data = new byte[8]; int id; int dlc; int flags; long timestamp; Console.WriteLine("Channel opened. Press Escape to close. "); Console.WriteLine("ID DLC DATA Timestamp"); while (!finished) { status = Canlib.canReadWait(handle, out id, data, out dlc, out flags, out timestamp, 100); Console.WriteLine(id); string idBinary = Convert.ToString(id, 2); if(idBinary.Length != 29) { idBinary = "0" + idBinary; } //Console.WriteLine(idBinary); string hex1 = idBinary.Substring(0, 3); string hex2 = idBinary.Substring(3, 18); string hex3 = idBinary.Substring(21, 8); Console.WriteLine(hex1); int h1 = HexConvert(hex1); int h2 = HexConvert(hex2); int h3 = HexConvert(hex3); Console.WriteLine("{0} {1} {2}",h1,h2,h3); int combinedID = (h1) | (h2 //Console.WriteLine(combinedID); status = Canlib.canWrite(handle, combinedID, data, data.Length, 0); CheckStatus(status, "canWrite"); Thread.Sleep(10); } } static void Main(string[] args) { // Holds a handle to the CAN channel int handle; // Status returned by the Canlib calls Canlib.canStatus status; // The CANlib channel number we would like to use int channelNumber = 3; Console.WriteLine("Initializing Canlib"); // Initialize the Canlib library with a call to // Canlib.initializeLibrary(). This always needs to be done before // doing anything with the library. Canlib.canInitializeLibrary(); handle = Canlib.canOpenChannel(channelNumber, Canlib.canOPEN_ACCEPT_VIRTUAL); CheckStatus((Canlib.canStatus)handle, "canOpenChannel"); // Once we have successfully opened a channel, we need to set its bitrate. We // do this using canSetBusParams. CANlib provides a set of predefined bus parameter // settings in the form of canBITRATE_XXX constants. For other desired bus speeds // bus paramters have to be set manually. // See CANlib documentation for more information on parameter settings. status = Canlib.canSetBusParams(handle, Canlib.canBITRATE_250K, 0, 0, 0, 0, 0); CheckStatus(status, "canSetBusParams"); // Next, take the channel on bus using the canBusOn method. This // needs to be done before we can send a message. status = Canlib.canBusOn(handle); CheckStatus(status, "canBusOn"); DumpMessageLoop(handle); } // The check method takes a canStatus (which is an enumerable) and the method // name as a string argument. If the status is an error code, it will print it. // Most Canlib method return a status, and checking it with a method like this // is a useful practice to avoid code duplication. private static void CheckStatus(Canlib.canStatus status, string method) { if (status { string errorText; Canlib.canGetErrorText(status, out errorText); Console.WriteLine(method + " failed: " + errorText); } } } }

Naimish Makwana · Answer

Try below int handle = ...; // your handle int id = ...; // your id byte[] msg = new byte[4]; msg[0] = (byte)0x04; // your first hex value msg[1] = (byte)(0x1F801 >> 16); // upper byte of your second hex value msg[2] = (byte)(0x1F801 & 0xFF); // lower byte of your second hex value msg[3] = (byte)0x7F; // your third hex value int dlc = msg.length; // length of your message int flag = ...; // your flag Canlib.canWrite(handle, id, msg, dlc, flag); Thanks

Sachin Singh · Answer

Then you will have to combine them, cause The Canlib.canWrite method in Kvaser CANlib expects a single integer ID value for the CAN message identifier. int combinedId = (hexValue1

Naveen · Answer

I tried all random cases the major near answer is 7,1F801,7F BUT I WANT IS 2,1F801,7F. its coming as FFF80102 i need to convert this to 2FF8017F.

Naveen · Answer

int combinedID = (h1) | (h2 int combinedID = (h1) | (h2 Thanks!

Sachin Singh · Answer

Then there are two options either call canWrite for each message or Concatenate them int handle = ...; // Your handle int flag = ...; // Your flag int dlc = ...; // Your data length code // Hex values int hexValue1 = 0x04; int hexValue2 = 0x1F801; int hexValue3 = 0x7F; // Convert hex values to byte arrays byte[] msg1 = BitConverter.GetBytes(hexValue1); byte[] msg2 = BitConverter.GetBytes(hexValue2); byte[] msg3 = BitConverter.GetBytes(hexValue3); // Call canWrite for each message Canlib.canWrite(handle, hexValue1, msg1, dlc, flag); Canlib.canWrite(handle, hexValue2, msg2, dlc, flag); Canlib.canWrite(handle, hexValue3, msg3, dlc, flag); OR int handle = ...; // Your handle int flag = ...; // Your flag int dlc = ...; // Your data length code // Hex values int hexValue1 = 0x04; int hexValue2 = 0x1F801; int hexValue3 = 0x7F; // Convert hex values to byte arrays byte[] msg1 = BitConverter.GetBytes(hexValue1); byte[] msg2 = BitConverter.GetBytes(hexValue2); byte[] msg3 = BitConverter.GetBytes(hexValue3); // Concatenate byte arrays byte[] concatenatedMsg = msg1.Concat(msg2).Concat(msg3).ToArray(); // Call canWrite with the concatenated message Canlib.canWrite(handle, hexValue1, concatenatedMsg, dlc, flag);

Naveen · Answer

Hi sachin, your answer is responding but not per my requirement. my hexvalue1 is 4 and hexvalue 2 is 1F801 and hexvalue 3 is 7F. please make changes for above.

Naveen · Answer

Hi sachin, int combinedID = (h1 combinedID &= 0x7FFFFFFF; i have tried this but output coimg as 000000 ,any other way? i think we need to use & operator for combininedID? Thanks!

Sachin Singh · Answer

have you tried this int combinedID = (h1

Sachin Singh · Answer

Not sure int combinedID = (h1

Sachin Singh · Answer

Maybe this should resolve your issue int combinedID = (h1) | (h2