topic How to use RXMSCAN with processor expert with kea 128? in Kinetis Microcontrollers

How to use RXMSCAN with processor expert with kea 128?

emilioaronmoyer — Fri, 06 May 2016 23:17:22 GMT

Hello,

I'm trying to read an id of a bus CAN, I want to do that using RX interrupt, I'm using KEA128 and processor expert (CAN_LDD component).

Now I'm able to write to the bus CAN without interrupt, but when I try to read a message with a defined id nothing happens.

What I'm doing to read is the following:

FrameR.MessageID = 0x7DFU; /* Set Tx ID value - standard */

FrameR.FrameType = LDD_CAN_DATA_FRAME; /* Specyfying type of Tx frame - Data frame */

FrameR.Length = sizeof(OutData2);

FrameR.Data = OutData2; /* Set number of bytes in data frame - 4B */

CAN1_ReadFrame(MyCANPtr,0,&FrameR); /* Sends the data frame over buffer 1 */

Does anyone know what i'm doing wrong and also what do I need to do to read using the Rx Can interrupt?

I attached the complete code for more details.

Regards,

Emilio

Original Attachment has been moved to: CAN_PE.rar

Re: How to use RXMSCAN with processor expert with kea 128?

Alice_Yang — Mon, 09 May 2016 06:49:00 GMT

Hello Emilio,

There is a bug in the generated code in CAN1.c file ,it have not enable the interrupt.

Please add " MSCAN_PDD_EnableTxMessageBufferInterruptMask(MSCAN_BASE_PTR,0X01U);"

in the function of LDD_TDeviceData* CAN1_Init(LDD_TUserData *UserDataPtr)

Hope it helps

Have a great day,
Alice

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Re: How to use RXMSCAN with processor expert with kea 128?

emilioaronmoyer — Mon, 09 May 2016 19:05:35 GMT

Hello Alice,

I'm writting to the CAN bus every 100 ms using a timer interrupt without the TxInterrupt line you say, if i write de line the program doesn't work.

Do you know why??

And without the line is also working well the CAN1_OnFreeTxBuffer event in Events.c.

I'm having problems reading a message from CAN I don't know how is the syntax to receive a message, where can I indicate which ID is going to read? and from which variable can I retrieve the data read?

Regards,

Emilio

Re: How to use RXMSCAN with processor expert with kea 128?

Alice_Yang — Tue, 10 May 2016 03:45:59 GMT

Hello Emilio,

About the read data , you can refer to the demo code :

- About the receive ID, you can configure here to control mask which one :

you can combined with the related registers to understand:

MSCAN_CANIDAR

MSCAN_CANIDMR

MSCAN_RSIDR

About use which variable to receive data , as for the below, it will use the "Inpdata[]",

so it mainly rely on the Frame.Data .

Hope it helps

Have a great day,
Alice

Re: How to use RXMSCAN with processor expert with kea 128?

emilioaronmoyer — Tue, 17 May 2016 21:50:27 GMT

Hello Alice,

I refered to the demo code and the code needs the method

Re: How to use RXMSCAN with processor expert with kea 128?

emilioaronmoyer — Tue, 17 May 2016 21:56:12 GMT

Hello Alice,

I refered to the demo code and the code needs the method.

But I didn`t find the method in the CAN_LDD component

What do I need to do to generate the method?

Another question, what do I need to write to the MSCAN_CANIDAR, MSCAN_CANIDMR, MSCAN_RSIDR if I want to read the ID0x7E8?

The reference manual there are a los of registers with those names

Regards,

Emilio Moyers

Re: How to use RXMSCAN with processor expert with kea 128?

Alice_Yang — Wed, 18 May 2016 09:40:56 GMT

Hello Emililo,

- This demo is for CAN on KIneites K series , sorry for my mistake.

The method of SetRxBufferID is also for K series, so you can not find it.

About the CAN demo for kea-128 , please refer to this thread, there also have a demo and the introduce:

I wonder how to get CAN to work with KDS's Processor Expert?

-About receive ID , at default it can receive all of the ID if you do not configure these register.

For the MSCAN module of KEA series , the ID related registers' function is mask which ID ,

so if you do not need mask Receive ID, you can do not care it .

Hope it helps

Have a great day,
Alice

Re: How to use RXMSCAN with processor expert with kea 128?

emilioaronmoyer — Wed, 18 May 2016 18:48:23 GMT

Hello Alice,

I can read one Id using the program in the help part of the CAN_LDD component. If I write this code in the program main.c:

while(1){

while (!DataFrameRxFlg) {} /* Wait until data frame is received */

FrameR.Data = InpData; /* Set Tx ID value - standard */

error=CAN1_ReadFrame(MyCANPtr2,0,&FrameR); /* Sends the data frame over buffer 1 */

DataFrameRxFlg = FALSE;

}

It should continue reading the id infinite time, but it only do it one time, do I need to clear a flag or do i need to do something else to continue reading?

Also for the part of the ID, I am interested in just reading one specific ID. What do I need to configure to the MSCAN_CANIDAR, MSCAN_CANIDMR, MSCAN_RSIDR register to read only the id 0x7E8?

Regards,

Emilio

Re: How to use RXMSCAN with processor expert with kea 128?

Alice_Yang — Thu, 19 May 2016 15:40:15 GMT

Hello Emilio,

-In the function of "CAN1_ReadFrame()" have clear the Rx flag:

Clearly the flag of the register MSCAN_CANRFLG to have a try.

- The ID length of 0x7E8 is lager than 11, so here only can use the Extended ID .

I refer to the Reference manual to calculate it , you can also try to calculate and check whether

is right about mine the result is

MSCAN_CANIDAR0 = 0x00;

MSCAN_CANIDAR1 = 0x18;

MSCAN_CANIDAR2 = 0x0f;

MSCAN_CANIDARn = 0x00;

MSCAN_CANIDMRn(n=0,1,2,3,) = 0x00;

pay attention that , i assumption you use the data frame , not the remote frame, it is said

the bit of RSRTR on the register of MSCAN_RSIDR1 is "0".

Hope is helps

Alice

Re: How to use RXMSCAN with processor expert with kea 128?

emilioaronmoyer — Fri, 22 Jul 2016 17:59:43 GMT

Hello Alice,

It continue doing the same, doing the reading just one time. what other thing can be?

Regards,

Emilio