调用SFO()出现的问题

//====================================================================
// The following declarations are required in order to use the SFO
// library functions:

首先在你的程序里必须定义下面的内容

//
int MEP_ScaleFactor[PWM_CH]; // Global variable used by teh SFO library
                     // Result can be used for all HRPWM channels
                     // This variable is also copied to HRMSTEP
                     // register by SFO() function.

// Array of pointers to EPwm register structures:
// *ePWM[0] is defined as dummy value not used in the example
volatile struct EPWM_REGS *ePWM[PWM_CH] =
             {  &EPwm1Regs,&EPwm1Regs};

//====================================================================

另外你需要在SFO_V6.h中定义，注意这里的值要和上面volatile struct EPWM_REGS的定义对应。

//============================================================================
// USER MUST UPDATE THIS CONSTANT FOR NUMBER OF HRPWM CHANNELS USED
//============================================================================
#define PWM_CH  2   // Equal # of HRPWM channels PLUS 1
                    // i.e. PWM_CH is 9 for 8 channels, 7 for 6 channels, etc.
//============================================================================