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Forum: DSP TriCore MultiCAN Transmit FIFO Problem.


von gapsna (Guest)


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Hi everyone, I've ben trying to transmit a FIFO Structure via CAN with 
my TriCore DSP but I#ve been stuck for the past few days and can't find 
the problem.

I use a modified version of the CAN_ubWriteFIFO function generated with 
Dave.
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uint8 TRANSMIT_FIFO_V2(uint8 OB_FIFO, uint8 size, CAN_SWObj *pstObj)
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{
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  uint8
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  retrn = 2;
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  //////////////////////// CONFIGURATION OF THE SLAVES
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  uint8 i,j;
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  uint32 tmp_u32;
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  uint8 aubFIFOWritePtr[128], ubFIFOReadPtr[128];
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  for(i=OB_FIFO+1; i<= OB_FIFO+size; i++)
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  {
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    tmp_u32 = 0x1000000*PCAN_LIST_NR;
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    tmp_u32 += (i << 16);
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    tmp_u32 += 0x2;  //Command
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    SetListCommand(tmp_u32); //////// ALOCATING EACH SLAVE TO THE SAME LIST
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    CAN_HWOBJ[i].uwMOFCR = (3);//MMC = 0011
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    CAN_HWOBJ[i].uwMOFGPR = (0x00FF0000)&(OB_FIFO<<16); // SLAVE CUR must point to BASE OBJ
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    CAN_HWOBJ[i].uwMOCTR = (1<<27)|(1<<24)|(1<<25)|(1<<23)|(1<<21)|(1<<19)|(1<<19);// SET DIR, TXRQ, TXEN0, RXEN, MSGVAL, NEWDAT, RESET TXEN1
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  }
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  //////////////////////// END CONFIGURATION OF THE SLAVES
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  //////////////////////// BASE OBJECT CONFIGURATION
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  CAN_HWOBJ[OB_FIFO].uwMOAMR = 0;// no mask
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  CAN_HWOBJ[OB_FIFO].uwMOFCR = (2)|(1<<27);//MMC = 0010+ DCL=8
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  CAN_HWOBJ[OB_FIFO].uwMOFGPR = ((OB_FIFO + size)<<24)|((OB_FIFO)<<16)|((OB_FIFO + size)<<8)|((OB_FIFO));// SEL + CUR + TOP + BOT
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  CAN_HWOBJ[OB_FIFO].uwMOCTR = (1<<27)|(1<<26)|(1<<25)|(1<<23)|(1<<21)|(1<<19);// SET DIR, TXEN0, TXEN1, RXEN, MSGVAL, NEWDAT
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  //////////////////////// END BASE OBJECT CONFIGURATION
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  //////////////////////// START TX FIFO TRANSMIT ACCORDING TO CAN_ubWriteFIFO() FROM DAVE, INFINEON
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  if((CAN_HWOBJ[OB_FIFO].uwMOFCR & 0x0000000F) == 0x00000002) // IF OB_FIFO IS A TX FIFO BASE OBJECT
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  {
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    j = OB_FIFO;
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    retrn = 0;
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    if((CAN_HWOBJ[j].uwMOCTR & 0x00000100) == 0x00000000)// IF TXRQ == 0
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    {
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        CAN_HWOBJ[j].uwMOCTR  = 0x01280000;// set TXRQ, NEWDAT, MSGVAL
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        retrn = 1;
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     }
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  }
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  return(retrn);
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}

Before calling this function I save the 8 byte Data and the ID in every 
Slave Object and in the Base Object.
After calling the function, It only sends the Data that is saved in the 
Base Object (I also happens if the Base Object is not part of the FIFO) 
with it's ID. CUR pointer of the Base Object moves to the next slave (in 
this case 0x68, beeing the Base Object the 0x67) but the data in the 
next slave object won't be transmitted. MOCTR Register of every Slave 
object is in following state: 0xYYZZ8BA8 (beeing YY and ZZ bytes for 
last and next object on the same list).

Any help would be apreciated.

Thank you all.
Vielen Dank.

Gapsna

von gapsna (Guest)


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SOLVED!!!!!!!!!!!

Problem was, that the PIR field in the MOAR Register of each slave had a 
value of 00b, I changed it to 01b and the FIFO works perfect!

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