CAN_LDD mk22fn1m0vlk12 loopback issues

[daafies]

hi i've been unable to loopback any can frames. i've tried all examples here on the forum without any luck. i enabled int service. breakpoint on CAN1_OnFreeTxBuffer DOES hit, but CAN1_OnFullRxBuffer does NOT.

here's some code snippets:

events.c:

void CAN1_OnFullRxBuffer(LDD_TUserData *UserDataPtr, LDD_CAN_TMBIndex BufferIdx)

{

  canrx = TRUE;

  /* Write your code here ... */

}

main.c:

extern bool canrx;

LDD_TDeviceData *MyCANPtr=NULL;

LDD_TError Error;

LDD_CAN_TFrame Frame,RFrame;

void can_test(void)

{

  LDD_CAN_TAccMask AccMask;

  uint8_t OutData[8] = {0x00U, 0x01U, 0x02U, 0x03U};

   Frame.MessageID = 0x123U;                                       /* Set Tx ID value - standard */                                       /* Set Tx ID value - standard */

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

   Frame.Length = sizeof(OutData);                                 /* Set number of bytes in data frame - 4B */

   Frame.Data = OutData;                                           /* Set pointer to OutData buffer */

   //DataFrameTxFlg = FALSE;                                         /* Initialization of DataFrameTxFlg */

   Error = CAN1_SendFrame(MyCANPtr, 1U, &Frame);

   Error = CAN1_GetAcceptanceMask(MyCANPtr, 0U, &AccMask );

}

int main(void)

{

  /* Write your local variable definition here */

  MyCANPtr = CAN1_Init(NULL);

  for(;;){

		WAIT1_Waitms(5);
		if(canrx){
			canrx=FALSE;

		RFrame.Data = InpData;
		Error = CAN1_ReadFrame(MyCANPtr, 0U, &RFrame);
		}

				cnt++;
		if ((cnt%1024)==0) { /* from time to time, write some text */

can_test();

}}

thanks for any pointers

david

[daafies]

hi Alice, please find atached the poject in question. i've configure it for loopback

also please note i've tried it on 2 boards with same processor i have here. same result :smileysad:

[Alice_Yang]

Hello David,

From your project , i have not find the send data project , so i create one

new project for the CAN-loopback about the chip of  mk22fn1m0vlk12 , and as

to i have not this chip , so i test it on the similar chip , it can work well , can run into

the receive interrupt ,

please test it on your side .

BR

Alice

[daafies]

Alice,

i figured it out. i had to put a messageID in the rx buffer, and send a frame with that msg id.
Confusing though cause i enabled global acceptance mask of 0x1ffffff.. doesn't that mean it should accept all msgs?

[Alice_Yang · Accepted solution]

Hi David,

So sorry for it , i will attach it this time if need .

And about this "i enabled global acceptance mask of 0x1ffffff.. doesn't that mean it should accept all msgs?" ,yes ,

it can accept all msgs.

While here you configure it receive the ID 0x7ff

while in your project you writ the send can ID is 12473156, not 0x7ff.

      Frame.MessageID = (12473156 | LDD_CAN_MESSAGE_ID_EXT);

Hope it helps

Have a great day,
Alice Yang

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[daafies]

thanks for help!

[daafies]

here's another project, with just can_ldd. it does NOT hit the receive interrupt on my end

[daafies]

you forgot to attach it :smileyhappy:

[daafies]

btw the sendframe is in 'flash_test()'    sorry re-purposed test code.

[daafies]

hi Alice, how do I select my processor for the demo project?

i'lll zip up my project and send it to you later

thanks for help

[daafies]

more screens i've forgotten

[Alice_Yang]

Hi david,

From the PE configuration , it seems there is no error.

Pleas test the demo code under KSDK1.3 on your board :

KSDK_1.3.0\examples\twrk21f120m\driver_examples\flexcan\flexcan_loopback\kds

Pay attention , when you download the project , please select the part number  or your chip,

and also please send your project to me , i will test it on my side the TWR-K21 board ,

i have test the demo on my board , it can run into the receive interrupt , while i have not the

chip "mk22fn1m0vlk12 " , so only need your help to test the demo , then i would be confirm

whether is the project error or the chip .

BR

Alice

[daafies]

hi Alice,

yes i do use PE. and 'self reception' was set already. i've tried auto and non-auto initialization.

btw all methods called return 0x0 (ERR_OK)

here's all component inspector screens

[Alice_Yang]

Hello David,

From your code , it seems that you use the Processor Expert project ,

if yes, please also enalbe the "Self reception"on the CAN_LDD component :

If you do not use the PE, please set the SRXDIS to 0 to enable it on the CANx_MCR register .

Hope it helps

Have a great day,
Alice Yang

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