CAN_ReceiveMessage function problem - Shieldbuddy TC375

shadowmaker
New Member

Posts: 2

CAN_ReceiveMessage function problem - Shieldbuddy TC375 Jul 15, 2021 22:26:27 GMT

Quote

Post by shadowmaker on Jul 15, 2021 22:26:27 GMT

Hi,
Based on user manual from web, I have created very basic listning to check how CAN bus works. At first I have checked how to send data - and this works fine. Next I was checked how to receive data and here I have an issue. The function returns status not equal to IfxCan_Status_receiveEmpty but it does not rewrite received data into CANMessagePayload variable.

CANMessagePayloadType CANMessagePayload;



void setup() {

    // put your setup code here, to run once:



    SerialASC.begin(115200);



    CAN_Init(100000);

    CAN_RxInit(0x100, 0x1FFFFFFFUL, 8, 11, 0);

 



    SerialASC.print("Multican is Initialized\n\r");



}



void loop()

{



    volatile static IfxCan_Status status;







    status = CAN_ReceiveMessage(0x100, &CANMessagePayload, 8);



    if (IfxCan_Status_receiveEmpty != status) {



        SerialASC.print("New data.");

        SerialASC.print((uint8)CANMessagePayload.bytes[0]);



    }



}

I'm sure that data are received. I have checked that. In map file I have found something interesting variable that came from MultiCAN.o, its name is g_AppCan, and I have looked at the address from map file in the debugger, and I have confirmed that data comes.

Yes, I'm sending text LUCY1989. And it is delivered, it comes into RAM, but it is not copied into CANMessagePayload. Has someone had similar issue?

Last Edit: Jul 16, 2021 12:24:10 GMT by shadowmaker

shadowmaker
New Member

Posts: 2

CAN_ReceiveMessage function problem - Shieldbuddy TC375 Jul 16, 2021 18:23:55 GMT

Quote

Post by shadowmaker on Jul 16, 2021 18:23:55 GMT

I'm still not able to resolve my issue. I'm debugging, and looking at the memory and what I know: CAN, default without numbers is mapped into CAN1. I do not have datasheet but when I look at the variables available in the debugger I have found IfxCan_RX10C_P23_0_IN variable that is related to my input pin - which pin is input i know from User manual. This variable shows that this input is mapped into CAN1

I see that in this address range there are my messages 'LUCY1989':

I also see that my message comes here as well:

the address is exactly 0xB0400C20. This address is written under address: 0x70004FA0, but I do not know what is there.
My messages are delivered but they are not rewritten into payload variable. Maybe does someone have the source for that?

sinai1
Junior Member

Posts: 79

CAN_ReceiveMessage function problem - Shieldbuddy TC375 Aug 10, 2021 17:01:00 GMT

Quote

Post by sinai1 on Aug 10, 2021 17:01:00 GMT

First of All wich CAN port are you using, I test this example with CAN0 and CAN3 also here is a example using CAN0 of your code hope this help you. also here is a modified library that for me works better. please just check the CAN ports on TC375, this was tested on TC275. Replace CAN0 for any CAN channel you want to use.

CAN_TC_275_library.rar (3.78 KB)

//typedef enum

//{

// IfxMultican_Status_ok = 0x00000000,

// IfxMultican_Status_notInitialised = 0x00000001,

// IfxMultican_Status_wrongParam = 0x00000002,

// IfxMultican_Status_wrongPin = 0x00000004,

// IfxMultican_Status_busHeavy = 0x00000008,

// IfxMultican_Status_busOff = 0x00000010,

// IfxMultican_Status_notSentBusy = 0x00000020,

// IfxMultican_Status_receiveEmpty = 0x00000040,

// IfxMultican_Status_messageLost = 0x00000080,

// IfxMultican_Status_newData = 0x00000100,

// IfxMultican_Status_newDataButOneLost = IfxMultican_Status_messageLost | IfxMultican_Status_newData

//} IfxMultican_Status;

//typedef struct

//{

// uint32 id; /**< \brief CAN message ID */

// IfxMultican_DataLengthCode lengthCode; /**< \brief CAN message data length code */

// uint32 data[2]; /**< \brief CAN message data */

// boolean fastBitRate; /**< \brief CAN FD fast bit rate enable/disable */

//} IfxMultican_Message;

//typedef union

//{

// uint8 bytes[8];

// uint32 dword[2];

//} CANMessagePayloadType;

IfxMultican_Message msg1;

IfxMultican_Status RxStatus;

CANMessagePayloadType CANMessagePayload;

void setup()

{

// put your setup code here, to run once:

SerialASC.begin(115200);

CAN0_Init(100000);

CAN0_RxInit(0x100, 0x1FFFFFFFUL, 8, 11, 0);

SerialASC.print("Multican is Initialized\n\r");

}

void loop()

{

char Local_Str[150];

RxStatus = CAN0_ReceiveMessage(0x100, &msg1, 8);

if ((RxStatus == IfxMultican_Status_noError) && (msg1.id == 0x100))

{

SerialASC.print("New data.");

CANMessagePayload.dword[0] = msg1.data[0];

CANMessagePayload.dword[1] = msg1.data[1];

sprintf(Local_Str, "Responce OK: %02X-%02X-%02X-%02X-%02X-%02X-%02X-%02X", CANMessagePayload.bytes[0], CANMessagePayload.bytes[1], CANMessagePayload.bytes[2], CANMessagePayload.bytes[3], CANMessagePayload.bytes[4], CANMessagePayload.bytes[5], CANMessagePayload.bytes[6], CANMessagePayload.bytes[7]);

SerialASC.println(Local_Str);

}

}