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TMS320F28335 eQEP模块，计算外部增量式编码器脉冲数，QPOSCNT的值一直为0

确定有脉冲输入，但没有捕获到，怀疑是哪配置有问题，但用ti官网的程序，也是同样的问题。具体配置程序如下：

InitEQep1Gpio();

 #if (CPU_FRQ_150MHZ)
           EQep1Regs.QUPRD = 1500000;        // Unit Timer for 100Hz at 150 MHz SYSCLKOUT =10ms
 #endif               //ÔÚ150MHzϵͳʱÖÓϲúÉú100HzµÄµ¥Î»Ê±¼äÖµ£¬¼´ÈÃqep10ms²úÉúÒ»´ÎtimeoutÖжϠ       
 #if (CPU_FRQ_100MHZ)
        EQep1Regs.QUPRD = 1000000;       // Unit Timer for 100Hz at 100 MHz SYSCLKOUT
 #endif       

        EQep1Regs.QPOSCNT = 0;               
        
        EQep1Regs.QDECCTL.bit.QSRC = 0;  // QEP quadrature count mode Çó»ý¼ÆÊýģʽ:²úÉú·½ÏòºÍ4±¶ÆµµÄʱÖÓ
        EQep1Regs.QDECCTL.bit.XCR = 0;      // 2x resolution (cnt falling and rising edges)
        EQep1Regs.QDECCTL.bit.SWAP = 0; 
        EQep1Regs.QDECCTL.bit.IGATE = 0;    //¸ÃλÖÃ1ºó£¬Á¬Ë÷ÒýÂö³å¶¼¹ýÂËÁË
        EQep1Regs.QDECCTL.bit.QAP = 0;
        EQep1Regs.QDECCTL.bit.QBP = 0; 
        EQep1Regs.QDECCTL.bit.QIP = 0; 
        EQep1Regs.QDECCTL.bit.QSP = 0; 
                
        EQep1Regs.QEPCTL.bit.FREE_SOFT = 2; //×ÔÈ»µØ¶¯×÷
        EQep1Regs.QEPCTL.bit.PCRM = 01;     // ÿ´ÎË÷Òýʼþ²úÉúʱQPOSCNT¸´Î»
//        EQep1Regs.QEPCTL.bit.PCRM=01;          // ×î´ó¼ÆÊýλÖÃʱQPOSCNT¸´Î»
        EQep1Regs.QEPCTL.bit.UTE = 1;       // Unit Timeout Enable ʹÄܵ¥Î»¶¨Ê±Æ÷
        EQep1Regs.QEPCTL.bit.QCLM = 1;   // Latch on unit time outʹÄܵ¥Î»Ê±¼äÊä³öʱÆäËûÖØÒª¼Ä´æÆ÷µÄËø´æ¹¦ÄÜ
//        EQep1Regs.QPOSMAX=0xffffffff;                 //λÖõÄ×î´ó¼ÆËãÖµ
        EQep1Regs.QPOSMAX = 7999;           //λÖõÄ×î´ó¼ÆËãÖµ
        EQep1Regs.QEPCTL.bit.QPEN = 1;      // QEP enable ʹÄÜQEP
                
        EQep1Regs.QCAPCTL.bit.UPPS = 5;     // 1/32 for unit position¼´Ã¿32¸öQCLK²úÉúÒ»¸öµ¥Î»Î»ÖÃʱ¼þ
        EQep1Regs.QCAPCTL.bit.CCPS = 7;     // 1/128 for CAP clock ¼´²¶×½¶¨Ê±Æ÷µÄʱÖÓƵÂÊΪSYSCLKOUT/128
        EQep1Regs.QCAPCTL.bit.CEN = 1;      // QEP Capture Enable ʹÄÜQEP²¶×½¹¦ÄÜ 

还请高手多多指教……