TI中文支持网#define PWM_MACRO(ch1,ch2,ch3,v) \
\
/* Mfuncx range is (-1,1) */ \
/* The code below changes PeriodMax*Mfuncx range …. */ \
/* from (-PeriodMax,PeriodMax) to (0,PeriodMax) where HalfPerMax=PeriodMax/2 */ \
\
(*ePWM[ch1]).CMPA.half.CMPA = _IQmpy(v.HalfPerMax,v.MfuncC1)+ v.HalfPerMax; \
(*ePWM[ch2]).CMPA.half.CMPA = _IQmpy(v.HalfPerMax,v.MfuncC2)+ v.HalfPerMax; \
(*ePWM[ch3]).CMPA.half.CMPA = _IQmpy(v.HalfPerMax,v.MfuncC3)+ v.HalfPerMax; \
#endif // __F2833X_PWM_H__
Maka Luo：
PWM模块可以直接配置周期和占空比，函数如下（pwm.c文件中）
//*****************************************************************************////! Sets the period of a PWM generator.//!//! \param ui32Base is the base address of the PWM module.//! \param ui32Gen is the PWM generator to be modified. This parameter must be//! one of \b PWM_GEN_0, \b PWM_GEN_1, \b PWM_GEN_2, or \b PWM_GEN_3.//! \param ui32Period specifies the period of PWM generator output, measured//! in clock ticks.//!//! This function sets the period of the specified PWM generator block, where//! the period of the generator block is defined as the number of PWM clock//! ticks between pulses on the generator block zero signal.//!//! \note Any subsequent calls made to this function before an update occurs//! cause the previous values to be overwritten.//!//! \return None.////*****************************************************************************voidPWMGenPeriodSet(uint32_t ui32Base, uint32_t ui32Gen, uint32_t ui32Period){ // // Check the arguments. // ASSERT((ui32Base == PWM0_BASE) || (ui32Base == PWM1_BASE)); ASSERT(_PWMGenValid(ui32Gen));
// // Compute the generator's base address. // ui32Gen = PWM_GEN_BADDR(ui32Base, ui32Gen);
// // Set the reload register based on the mode. // if(HWREG(ui32Gen + PWM_O_X_CTL) & PWM_X_CTL_MODE) { // // In up/down count mode, set the reload register to half the requested // period. // ASSERT((ui32Period / 2) < 65536); HWREG(ui32Gen + PWM_O_X_LOAD) = ui32Period / 2; } else { // // In down count mode, set the reload register to the requested period // minus one. // ASSERT((ui32Period <= 65536) && (ui32Period != 0)); HWREG(ui32Gen + PWM_O_X_LOAD) = ui32Period – 1; }}
//*****************************************************************************////! Sets the pulse width for the specified PWM output.//!//! \param ui32Base is the base address of the PWM module.//! \param ui32PWMOut is the PWM output to modify. This parameter must be one//! of \b PWM_OUT_0, \b PWM_OUT_1, \b PWM_OUT_2, \b PWM_OUT_3, \b PWM_OUT_4,//! \b PWM_OUT_5, \b PWM_OUT_6, or \b PWM_OUT_7.//! \param ui32Width specifies the width of the positive portion of the pulse.//!//! This function sets the pulse width for the specified PWM output, where the//! pulse width is defined as the number of PWM clock ticks.//!//! \note Any subsequent calls made to this function before an update occurs//! cause the previous values to be overwritten.//!//! \return None.////*****************************************************************************voidPWMPulseWidthSet(uint32_t ui32Base, uint32_t ui32PWMOut, uint32_t ui32Width){ uint32_t ui32GenBase, ui32Reg;
// // Check the arguments. // ASSERT((ui32Base == PWM0_BASE) || (ui32Base == PWM1_BASE)); ASSERT(_PWMOutValid(ui32PWMOut));
// // Compute the generator's base address. // ui32GenBase = PWM_OUT_BADDR(ui32Base, ui32PWMOut);
// // If the counter is in up/down count mode, divide the width by two. // if(HWREG(ui32GenBase + PWM_O_X_CTL) & PWM_X_CTL_MODE) { ui32Width /= 2; }
// // Get the period. // ui32Reg = HWREG(ui32GenBase + PWM_O_X_LOAD);
// // Make sure the width is not too large. // ASSERT(ui32Width < ui32Reg);
// // Compute the compare value. // ui32Reg = ui32Reg – ui32Width;
// // Write to the appropriate registers. // if(PWM_IS_OUTPUT_ODD(ui32PWMOut)) { HWREG(ui32GenBase + PWM_O_X_CMPB) = ui32Reg; } else { HWREG(ui32GenBase + PWM_O_X_CMPA) = ui32Reg; }}
xyz549040622：
有个PWM配置函数的，你可以看看驱动手册，详细了解下该函数每个参数的作用。每种MCU的配置函数都是不一样的，要想像DSP中那样实现，你只能操作寄存器自己写了。
