This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

F280x 的SCI RX中断导致 Illegal TRAP问题

最近调试项目一个串口通讯功能,在project正常(PieCtrlRegs.PIEIER9.bit.INTx3 = 0; 时一切正常) 情况下,使能SCIB接收中断(PieCtrlRegs.PIEIER9.bit.INTx3 = 1;) 会导致非法中断。接收中断中基本什么都没有干,挂仿真器查看发现  进了第一次中断接收到第一个字节(收到的这个字节是对的)后就再也进不了第二次接收中断,停在ILLEGAL_ISR中。

main()
{
......

InitPeripherals();

EALLOW;
PieVectTable.EPWM1_INT = &PWM_LOAD_ISR;
PieVectTable.SCIRXINTB = &SWI_SCIBRX_ISR;
EDIS;

PieCtrlRegs.PIEIER3.bit.INTx1 = 1;
PieCtrlRegs.PIEIER9.bit.INTx3 = 1;

IER |= M_INT3;
IER |= M_INT13;
IER |= M_INT9;

......
}

InitPeripherals ()中对SCI初始化如下(这段初始化是从另一个能正常串口通讯的28335项目移植的):

ScibRegs.SCICCR.all = 0x0007;
ScibRegs.SCICTL1.all = 0x0003;
ScibRegs.SCICTL2.bit.TXINTENA = 1;
ScibRegs.SCICTL2.bit.RXBKINTENA = 1;

//9600 baud @LSPCLK = 25MHz.
ScibRegs.SCIHBAUD = 0x0001;
ScibRegs.SCILBAUD = 0x0044;

ScibRegs.SCIRXST.all = 0x00;
ScibRegs.SCIRXEMU = 0x00;
ScibRegs.SCIRXBUF.all = 0x00;
ScibRegs.SCITXBUF = 0x00;

ScibRegs.SCIFFTX.all = 0xE040;
ScibRegs.SCIFFRX.all = 0x6061;
ScibRegs.SCIFFCT.all = 0x00;
ScibRegs.SCIFFTX.bit.TXFIFOXRESET = 1;
ScibRegs.SCIFFRX.bit.RXFIFORESET = 1;
//ScibRegs.SCIPRI.all = 0x10;
ScibRegs.SCIPRI.bit.FREE = 1;
ScibRegs.SCICTL1.all = 0x0023;

接收中断如下:

void SWI_SCIBRX_ISR(void)
{
PieCtrlRegs.PIEACK.all = PIEACK_GROUP9;
PieCtrlRegs.PIEIER9.bit.INTx3 = 0;

SCI_RX_INT_PROCESS(SCIB_PORT);

ScibRegs.SCIFFRX.bit.RXFFOVRCLR = 1;
ScibRegs.SCIFFRX.bit.RXFFINTCLR = 1;
PieCtrlRegs.PIEIER9.bit.INTx3 = 1;
}


void SCI_RX_INT_PROCESS(Uint8 u8sciId)
{
Uint16 wRxData;

wRxData = ScibRegs.SCIRXBUF.all;
}

进一次SWI_SCIBRX_ISR() 后,继续运行便会停在如下非法中断里

interrupt void ILLEGAL_ISR(void) 
{
EINT;

asm (" ESTOP0");

for(;;);
}

有哪位高手能知道原因吗?希望TI能尽快回复!

  • 你在仿真的时候,在进入ESTOP0的时候,可以看一下debug界面中显示CPU跑在那句代码,或是看PC指针。

    另外查看一下SCIB的相关中断标志位和出错标志位,看是什么情况,以及PIE向量表是否有对应的入口函数。会不会触发了什么中断,而PIE向量表没有初始化,就会进入ILLGAL ISR。

    我附上F280X的例程,你可以做对比测试:

    http://www.deyisupport.com/cfs-file.ashx/__key/communityserver-discussions-components-files/56/2451.280x.zip

    ERIC

  • 你的中断函数命名有问题,

    void SWI_SCIBRX_ISR(void) 

    PieCtrlRegs.PIEACK.all = PIEACK_GROUP9; 
    PieCtrlRegs.PIEIER9.bit.INTx3 = 0;

    SCI_RX_INT_PROCESS(SCIB_PORT);

    ScibRegs.SCIFFRX.bit.RXFFOVRCLR = 1; 
    ScibRegs.SCIFFRX.bit.RXFFINTCLR = 1; 
    PieCtrlRegs.PIEIER9.bit.INTx3 = 1;
    }

    如果是中断服务函数应该是interrupt开头的。

    比如:interrupt void DPL_ISR_wFRA();

  • 从SCI RX中断出来后单步运行一直正常,但按Run运行的时候就立即进ILLEGAL_ISR,向量表初始化确认都对的,SCI中断定义时忘了加关键字interrupt