TMS320F280049C: LIN register IODFTCTRL bit28(ISFERRENA)

Hi Vince,

Thanks for your reply. Here's the reply from the customer:

The problem is that after enabling ISFERRENA and turning on the analog loopback to pass the sending pin, the corresponding flag bit is not set.
I captured the signal using a logic analyzer and found that the sync fields were the same as normal.

 baud rate 20k

__interrupt void level0ISR(void);
__interrupt void level1ISR(void);
void lin_enable_int(LIN_InterruptLine INTERRUPT_LINEx,uint32_t intFlags);
void main()
{
    uint16_t txID;
    txID = 0x10 ;
    txID = LIN_generateParityID(txID);

    Device_init();
    Device_initGPIO();

    GPIO_setPinConfig(GPIO_37_LINA_TX);
    GPIO_setPadConfig(37, GPIO_PIN_TYPE_STD | GPIO_PIN_TYPE_PULLUP);
    GPIO_setQualificationMode(37, GPIO_QUAL_ASYNC);
    GPIO_setDirectionMode(37U, GPIO_DIR_MODE_OUT);

    GPIO_setPinConfig(GPIO_35_LINA_RX);
    GPIO_setPadConfig(35, GPIO_PIN_TYPE_STD);
    GPIO_setQualificationMode(35, GPIO_QUAL_ASYNC);
    GPIO_setDirectionMode(35U, GPIO_DIR_MODE_IN);


    Interrupt_initModule();

    Interrupt_initVectorTable();
    EINT;
    ERTM;
    Interrupt_register(INT_LINA_0, &level0ISR);
    Interrupt_register(INT_LINA_1, &level1ISR);

    Interrupt_enable(INT_LINA_0);
    Interrupt_enable(INT_LINA_1);

    LIN_initModule(LINA_BASE);
     //波特率20K
    LIN_setBaudRatePrescaler(LINA_BASE, 312U, 0U);
    //设置ISF中断
    lin_enable_int(LIN_INTERRUPT_LINE0,LIN_INT_ISFE);
    LIN_disableIntLoopback(LINA_BASE);
    //创建isf错误 
    // Clear the IO DFT Enable Key
    HWREGH(myLIN_BASE + LIN_O_IODFTCTRL) &= ~(LIN_IODFTCTRL_IODFTENA_M);
    // Enable write access
    HWREGH(myLIN_BASE + LIN_O_IODFTCTRL) |= (LIN_IO_DFT_KEY <<LIN_IODFTCTRL_IODFTENA_S);
    //HWREG_BP(myLIN_BASE + LIN_O_IODFTCTRL) |= LIN_ISF_ERROR;
    HWREG_BP(myLIN_BASE + LIN_O_IODFTCTRL) |= LIN_ISF_ERROR|0x2;//模拟回环通过发送引脚  

    while(!LIN_isTxReady(LINA_BASE));
    //发送数据
    LIN_sendData(LINA_BASE, txData);
    LIN_setIDByte(LINA_BASE, txID);

    while(1);
}
void lin_enable_int(LIN_InterruptLine INTERRUPT_LINEx,uint32_t intFlags)
{
    LIN_enableInterrupt(LINA_BASE, intFlags);
//INT0
    if(INTERRUPT_LINEx==LIN_INTERRUPT_LINE0)
    {
        //仅在LIN模式下，将各个中断源映射到 INT0 线
        LIN_setInterruptLevel0(LINA_BASE, intFlags);
        //使能全局中断0
        LIN_enableGlobalInterrupt(LINA_BASE, LIN_INTERRUPT_LINE0);
        //失能全局中断1
        LIN_disableGlobalInterrupt(LINA_BASE, LIN_INTERRUPT_LINE1);
        //清除全局中断标志位
        LIN_clearGlobalInterruptStatus(LINA_BASE, LIN_INTERRUPT_LINE0);
    }
//INT1
    else
    {
        //仅在LIN模式下，将各个中断源映射到 INT1 线
        LIN_setInterruptLevel1(LINA_BASE, intFlags);
        LIN_enableGlobalInterrupt(LINA_BASE, LIN_INTERRUPT_LINE1);
        //失能全局中断0
        LIN_disableGlobalInterrupt(LINA_BASE, LIN_INTERRUPT_LINE0);
        LIN_clearGlobalInterruptStatus(LINA_BASE, LIN_INTERRUPT_LINE1);
    }
}
__interrupt void level0ISR(void)
{
    level0Count++;
    if(LIN_getInterruptStatus(LINA_BASE)& LIN_FLAG_ISFE)
    {
        vectorOffset = LIN_getInterruptLine0Offset(LINA_BASE);
        LIN_clearInterruptStatus(LINA_BASE, LIN_INT_ISFE);
    }
    if(LIN_getInterruptStatus(LINA_BASE)& LIN_FLAG_CE)
    {
        vectorOffset = LIN_getInterruptLine0Offset(LINA_BASE);
        LIN_clearInterruptStatus(LINA_BASE, LIN_INT_ISFE);
    }
       
        vectorOffset = LIN_getInterruptLine0Offset(LINA_BASE);
        LIN_clearGlobalInterruptStatus(LINA_BASE, LIN_INTERRUPT_LINE0);
        Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP8);
}

__interrupt void level1ISR(void)
{

}

Hi Vince,

After the customer turns off the internal loopback mode and the analog loopback mode, they only enable ISFERRENA. The waveform sent out is similar to the picture above, and the synchronization field has not changed.
They wasn't sure if this was a code configuration issue.
Could you please help them debugging in launchPad in your side?

--

Thanks & Regards