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eCan Data Byte Order

turaner
Prodigy 30 points

Hi all,

I am using f2812 in my project and need to have can communication with a pc. I made system work properly with default InitECan function. But I need to change the DBO and when I add 

ECanaRegs.CANMC.bit.DBO = 1;

to InitECan function CAN communication does not work.

Below there is InitEcan function that I use.

Does anybody has ideas why communication fails with DBO=1?

void InitECan(void)
{
EALLOW;

/* Configure eCAN pins using GPIO regs*/
GpioMuxRegs.GPFMUX.bit.CANTXA_GPIOF6 = 1;
GpioMuxRegs.GPFMUX.bit.CANRXA_GPIOF7 = 1;
/* Configure eCAN RX and TX pins for eCAN transmissions using eCAN regs*/
ECanaRegs.CANTIOC.bit.TXFUNC = 1;
ECanaRegs.CANRIOC.bit.RXFUNC = 1;
/* Configure eCAN for HECC mode – (reqd to access mailboxes 16 thru 31) */
// HECC mode also enables time–stamping feature
ECanaRegs.CANMC.bit.SCB = 1;
ECanaRegs.CANMC.bit.DBO = 1;
/* Initialize all bits of ’Master Control Field’ to zero */
// Some bits of MSGCTRL register come up in an unknown state. For proper operation,
// all bits (including reserved bits) of MSGCTRL must be initialized to zero

ECanaMboxes.MBOX0.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX1.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX2.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX3.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX4.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX5.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX6.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX7.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX8.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX9.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX10.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX11.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX12.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX13.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX14.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX15.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX16.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX17.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX18.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX19.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX20.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX21.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX22.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX23.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX24.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX25.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX26.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX27.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX28.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX29.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX30.MSGCTRL.all = 0x00000000;
ECanaMboxes.MBOX31.MSGCTRL.all = 0x00000000;
// TAn, RMPn, GIFn bits are all zero upon reset and are cleared again
// as a matter of precaution.
/* Clear all TAn bits */
ECanaRegs.CANTA.all = 0xFFFFFFFF;
/* Clear all RMPn bits */
ECanaRegs.CANRMP.all = 0xFFFFFFFF;
/* Clear all interrupt flag bits */
ECanaRegs.CANGIF0.all = 0xFFFFFFFF;
ECanaRegs.CANGIF1.all = 0xFFFFFFFF;
/* Configure bit timing parameters */
ECanaRegs.CANMC.bit.CCR = 1 ; // Set CCR = 1
while(ECanaRegs.CANES.bit.CCE != 1 ) {} // Wait for CCE bit to be set..
ECanaRegs.CANBTC.bit.BRPREG = 39;
ECanaRegs.CANBTC.bit.TSEG2REG = 2;
ECanaRegs.CANBTC.bit.TSEG1REG = 10;
ECanaRegs.CANMC.bit.CCR = 0 ; // Set CCR = 0
while(ECanaRegs.CANES.bit.CCE == !0 ) {} // Wait for CCE bit to be cleared..
/* Disable all Mailboxes */
ECanaRegs.CANME.all = 0; // Required before writing the MSGIDs
}

  • 0 in reply to turaner
    Prodigy 30 points

    I solved the problem of hte system.

    Now I have succesful communication.

    But still I can not understand how the software affected by the little change I did which is described below. If someone explain me the reason, I will be glad.

    void InitECan(void)
    {
    EALLOW;

    /* Configure eCAN pins using GPIO regs*/
    GpioMuxRegs.GPFMUX.bit.CANTXA_GPIOF6 = 1;
    GpioMuxRegs.GPFMUX.bit.CANRXA_GPIOF7 = 1;
    /* Configure eCAN RX and TX pins for eCAN transmissions using eCAN regs*/
    ECanaRegs.CANTIOC.bit.TXFUNC = 1;
    ECanaRegs.CANRIOC.bit.RXFUNC = 1;
    /* Configure eCAN for HECC mode – (reqd to access mailboxes 16 thru 31) */
    // HECC mode also enables time–stamping feature
    ECanaRegs.CANMC.bit.SCB = 1;
    //ECanaRegs.CANMC.bit.DBO = 1;   // remove this expression here and add it below.
    /* Initialize all bits of ’Master Control Field’ to zero */
    // Some bits of MSGCTRL register come up in an unknown state. For proper operation,
    // all bits (including reserved bits) of MSGCTRL must be initialized to zero

    ECanaMboxes.MBOX0.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX1.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX2.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX3.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX4.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX5.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX6.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX7.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX8.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX9.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX10.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX11.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX12.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX13.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX14.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX15.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX16.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX17.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX18.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX19.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX20.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX21.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX22.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX23.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX24.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX25.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX26.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX27.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX28.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX29.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX30.MSGCTRL.all = 0x00000000;
    ECanaMboxes.MBOX31.MSGCTRL.all = 0x00000000;
    // TAn, RMPn, GIFn bits are all zero upon reset and are cleared again
    // as a matter of precaution.
    /* Clear all TAn bits */
    ECanaRegs.CANTA.all = 0xFFFFFFFF;
    /* Clear all RMPn bits */
    ECanaRegs.CANRMP.all = 0xFFFFFFFF;
    /* Clear all interrupt flag bits */
    ECanaRegs.CANGIF0.all = 0xFFFFFFFF;
    ECanaRegs.CANGIF1.all = 0xFFFFFFFF;
    /* Configure bit timing parameters */
    ECanaRegs.CANMC.bit.CCR = 1 ; // Set CCR = 1
    while(ECanaRegs.CANES.bit.CCE != 1 ) {} // Wait for CCE bit to be set..
    ECanaRegs.CANBTC.bit.BRPREG = 39;
    ECanaRegs.CANBTC.bit.TSEG2REG = 2;
    ECanaRegs.CANBTC.bit.TSEG1REG = 10;
    ECanaRegs.CANMC.bit.CCR = 0 ; // Set CCR = 0
    while(ECanaRegs.CANES.bit.CCE == !0 ) {} // Wait for CCE bit to be cleared..

    ECanaRegs.CANMC.bit.DBO = 1;

    /* Disable all Mailboxes */
    ECanaRegs.CANME.all = 0; // Required before writing the MSGIDs
    }