Facing issue with LINFLEX_0: Help needed

[saswatkd]

Posted on April 23, 2015 at 17:36

Hi,

I am writing a LINFLEX_0 driver for SPC560B60L3. DMA is not used as of now. All interrupts are disabled.

Linflex_0 can be configured in 2 sets of port pins

set 1: LIN0TX in PB[0] and LIN0RX in PB[1]. Alternate function in PB[0] is 3.

set 2: LIN0TX in PB[2] and LIN0RX in PB[3]. Alternate function in PB[0] is 1.

If i use set2 i could see the LIN signals in the lin bus. However if i use set1 i do not see any lin signal. I checked the microcontroller pins using oscilloscope and did not see any signal.

I am writing the functions used as mentioned below.

int main (void)

{

   

    __DI(); // Disable All interrupts

   

    Disable_Watchdog();

    MCU_Mode_Init();

    MCU_PLL_Init();

    /* RUN0 Module Config*/

    ME.ME_RUN_MC[0].B.FXOSCON=1;

    ME.ME_RUN_MC[0].B.FMPLLON=1;

    ME.ME_RUN_MC[0].B.SYSCLK=4;

   

    ME.RUN_PC[0].B.RUN0 = 0x1;

    ME.PCTL[48].R = 0x00;

    ME.PCTL[49].R = 0x00;

    ME.PCTL[68].R = 0x00;

   

   /* DRUN-> RUN0 Transition*/

    MCU_SetRunMode(4);

 

 

#if 0

   /* Non Working PORT COnfiguration */

 SIU.PCR[16].B.PA =  0x3;

 SIU.PCR[17].B.IBE = 0x1;

 SIU.PSMI[62].B.PADSEL = 0x1;

#else

   /* Working PORT COnfiguration */

 SIU.PCR[18].B.PA =  0x1;

 SIU.PCR[19].B.IBE = 0x1;

 SIU.PSMI[62].B.PADSEL = 0x0;

  

#endif

 

   LIN_InitChannel ( );

   LIN_SendHeader( );

    /* Enable global interrupt */

    __EI();

   

 

    while(1);

}

void LIN_InitChannel(  void )

{

 

    LINCR1.B.INIT=1;       /* Put the Device into Initialization mode*/

    LINCR1.B.SLEEP = 0;        /* sleep mode cleared*/

    LINCR1.B.MBL =10;      /* 20 bit synch */

    LINCR1.B.MME=1;        /* enable master mode*/

    LINCR1.B.SFTM = 0; /* disabled self test mode*/

    LINCR1.B.LBKM = 0; /* Enabled loop back mode */

    LINFLEX_Ptr->LINFBRR.B.DIV_F=0x5;       /* Write fractional part first*/

    LINFLEX_Ptr->LINIBRR.B.DIV_M=0xD0;

    LINFLEX_Ptr->LINCR1.B.INIT=0;

}

void LIN_SendHeader(void)

{

    LINFLEX_Ptr->BDRL.B.DATA0=0xF0;

    LINFLEX_Ptr->BDRL.B.DATA1=0xF0;

    LINFLEX_Ptr->BDRL.B.DATA2=0xF0;

    LINFLEX_Ptr->BDRL.B.DATA3=0xF0;

    LINFLEX_Ptr->BDRM.B.DATA4=0xF0;

    LINFLEX_Ptr->BDRM.B.DATA5=0xF0;

    LINFLEX_Ptr->BDRM.B.DATA6=0xF0;

    LINFLEX_Ptr->BDRM.B.DATA7=0xF0;

    LINFLEX_Ptr->BIDR.B.ID=9;   /* ID without Parity*/

    LINFLEX_Ptr->BIDR.B.CCS=1;  /* Checksum  0- enhanced, 1- classic*/

    LINFLEX_Ptr->BIDR.B.DFL=7;  /* Number of data bytes in the response part of the frame*/

    LINFLEX_Ptr->BIDR.B.DIR=1;

    LINFLEX_Ptr->LINCR2.B.HTRQ = 1;         /* Request header transmission */

/* If i check the LINS bit for 7, which should be the ideal case, it hangs up.

 So i an checking for 6. Atleast i could see something in the bus */

    while(LINFLEX_Ptr->LINSR.B.LINS!=0x6);

}

I just tried to give a simple version of the driver here. Main point is it is working in 1 set of port and not working in the other.

Compiler used is : Greenhills 6.1.6

Any help and hints would be highly appreciated.

Regards,

Saswat

[Erwan YVIN]

Posted on April 24, 2015 at 10:52

Hello Saswat ,

Do you use a Motherboard and Minimodule or Discovery ?

Did you try to set the OBE for B[0]

SIU.PCR[16].B.OBE =  1;

   Best regards

              Erwan

[saswatkd]

Posted on April 27, 2015 at 12:44

Hi, Thank you for the response. I use a motherboard from ST. I have found the root cause. I could see the Lin signals in the micro pin when they are terminated in a LIN transceiver. In case of the motherboard, the LIN transceiver is connected to PCR 18 and 19. So I could see the signals.

I hardwired PCR 16 and 17 to the LIN transceiver an I could see the signals there as well :).

- Saswat

[Erwan YVIN]

Posted on April 28, 2015 at 09:35

Good news ;)

have a nice day ;)

      Erwan