Hi, I am implementing a CAN controller on the HCS12X us...

IanM — Thu, 04 Sep 2008 16:59:13 GMT

Hi,

I am implementing a CAN controller on the HCS12X using the x-gate based on AN2726, I have got the X-Gate to interrupt and handle an Rx CAN message no problem and create an event in the core micro once completed using the sif() instruction. The issue that I am have is that when I try to update a variable that has been passed to the x-gate Rx Can handler I get a XGateError Interrupt raised. As far as I can tell I have followed the application note but stil get this error, I have no problem reading the CAN registers in the Xgate interrupt handler, I am using the COSMIC compiler.

Example code below any help would be appreciated.

XGCANstruct XGCAN0 = {&CAN0
                     ,ID_Table_CAN0
                     ,MsgData_CAN0
                     ,MsgLen_CAN0
                     ,MsgStatus
           ,MsgIndex_CAN0};

@interrupt void Xgate_CAN_Receive(XGCANstruct channel)
{
tU08 box;
tU08 rxid;
if(_ssem(CANSEMXG))
{
          _csem(CANSEMXG);

//This line causes the error
  *(tU16*)(channel.pBuffer[0]    ) = *(tU16*)(channel.pCAN->rxbuf.dsr    );

}

Re: Hi, I am implementing a CAN controller on the HCS12X us...

Steve — Thu, 04 Sep 2008 17:45:30 GMT

It depends a bit on the S12X that you are using but have a look at AN3555 for some help on how to track down errors.

I would guess that you are probably trying to do a misaligned access when reading the variable

S12 / MagniV Microcontrollers中的主题 Re: Hi, I am implementing a CAN controller on the HCS12X us...

Hi, I am implementing a CAN controller on the HCS12X us...

Re: Hi, I am implementing a CAN controller on the HCS12X us...