TMS320F280049C: LIN模块中IODFTCTRL寄存器bit28(ISFERRENA)功能未成功

我已经咨询了相关工程师，请关注下方链接：

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1289130/tms320f280049c-lin-register-iodftctrl-bit28-isferrena

问题在于使能ISFERRENA以后，开启模拟回环通过发送引脚后，相应的标志位没有被设置，我使用逻辑分析仪捕捉了信号，发现同步字段与正常的一样，（波特率20K）

以下是我的代码

__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)
{

}

你好，能继续帮我问一下工程师吗，谢谢帮助

已跟进

我在关闭内部回环模式和模拟回环模式后，仅仅只使能ISFERRENA，发出来的波形和上图差不多，其同步字段也没有什么改变，我不确定这是否是代码配置问题，我想请工程师尝试在TMS320F280049C的Launchxl板上使用该功能给我一些反馈结果，谢谢

已跟进