TWR-k60 default Handler

[ivanrobles]

I'm trying to debug my code step by step about CAN. I have my main.c as:

int main(void)

{

  uint32 MBRxID = 0x659; //Mail box RX ID

  uint32 MBTxID = 0x82; //Mail box TX ID

  uint08 BytesReceived = 0; //Bytes read from CAN bus

  uint32 GetID;

  uint16 BaudRate = 1000; //1 Mbit/s

  uint32 Data0Received = 0; //Data read from MB

  uint32 Data1Received = 0; //Data read from MB

  uint32 Data0Send = 0x12345678; //Data that will be sent

  uint32 Data1Send = 0x98765432;      //Data that will be sent

  uint08 NumBytesTX = 8; //Number of bytes that will be sent

  /* Init FlexCAN module, Clock, interrupts and GPIO*/

  FlexCAN1Init();

  /* Config the FlexCAN module and Baud rate */

  FlexCAN1Config(BaudRate);

  /* Prepare Mailbox to receive */

  FlexCAN1PrepareMBRX(MBRxID, FLEXCAN_MB9, FLEXCAN_STD_DATA_FRAME, FLEXCAN_MB_asRX);

  /* Prepare Mailbox to transmit */

  FlexCAN1PrepareMBTX(MBTxID, Data0Send, Data1Send, FLEXCAN_MB8, FLEXCAN_STD_DATA_FRAME, FLEXCAN_MB_asTX,NumBytesTX);

  for(;;)

  {  

  FlexCAN1TransmitMB(FLEXCAN_MB8);

  do

  {

  BytesReceived = FlexCAN1Receive(&GetID, Data0Received, Data1Received);

  }while(!BytesReceived);

  }

  return 0;

}

When the debug enters in  FlexCAN1Init(); function, it configure the clock and the port. After, the debug sends me to the function

void Default_Handler()

{

  __asm("bkpt");

}

It inside in kinetis_sysinit.c and the code never exists of there, How do I fix it?

[ivanrobles · Accepted solution]

Hello Monica,

Yes I have. The issue was that the Clock for the PORTE wasn't set.

thank you so much!!! :smileywink:

[egoodii]

You might also benefit from a 'better' fault-handler, such as that I have gleaned from some Freescale projects and attached here.  If the fault is a write-access, you will get 'imprecise' information, as writes are buffered.  To force a precise capture of information (for debug, as this is a performance penalty) you can turn that off:

SCB_ACTLR |= SCB_ACTLR_DISDEFWBUF_MASK;

Note that this vector table is specific to a K20-100, and is only 'generally related' to a K60 table.

[Monica]

Hello Ivan,

Have this suggestions been helpful? Please keep us posted, we'd like to know :smileywink:

Best,

Monica.

[Hui_Ma]

Hi,

Please check if during FlexCAN1Init() function, it enabled the FlexCAN1 clock gate before the FlexCAN1 module related registers access.

You could enable FlexCAN1 clock gate with below code:

SIM_SCGC3 |= SIM_SCGC3_FLEXCAN1_MASK;

Freescale also provides FlexCAN example code, please check [can_loopback_node] example with below link:

KINETIS512_SC  : Kinetis family example projects.

http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=K60_100&nodeId=01624698C9DE2DDDAF&fps...

Wish it helps.

B.R.

Ma Hui