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器件型号：TIDA-010054 大家好！
我正在尝试了解在"DAB.h"文件下的"DAB_calculatePWMDutyPeriodPhaseShiftTicks ()"函数中 HRPWM 相移的实现。 该函数计算"扩展相移模式"或"单相移模式"的移位。 这里是 "dab.h"文件中原始函数的副本。
#pragma FUNC_ALWAYS_INLINE(DAB_calculatePWMDutyPeriodPhaseShiftTicks)
static inline void DAB_calculatePWMDutyPeriodPhaseShiftTicks(void)
{
uint32_t temp;
//
// Calculation for the period is done in high resolution
// as it is used by the phase shift variable in high resolution
//
temp = ((uint32_t)(((float32_t)(DAB_pwmPeriod_pu *
DAB_pwmPeriodMax_ticks) *
(float32_t)65536.0)))>> 1;
DAB_pwmPeriod_ticks = temp & 0xFFFFFF00;
//
// In high resolution phase shift,high resolution duty is not available
// when using HRCFG.CTLMODE as 1 but the calculation below calculates the
// CMPAHR value, it's easier to do so as the period ticks are in high
// resolution format
//
DAB_pwmDutyAPrim_ticks = (uint32_t)((float32_t)DAB_pwmPeriod_ticks *
(float32_t)
(1.0f - fabsf(DAB_pwmDutyPrim_pu)));
DAB_pwmDutyASec_ticks = (uint32_t)((float32_t)DAB_pwmPeriod_ticks *
(float32_t)
(1.0f - fabsf(DAB_pwmDutySec_pu)));
//
// the below is to make sure CMPAHR is never 0x00,
//
if((DAB_pwmDutyAPrim_ticks & 0x00FF00) == 0)
{
DAB_pwmDutyAPrim_ticks = DAB_pwmDutyAPrim_ticks | 0x000100;
}
if((DAB_pwmDutyASec_ticks & 0x00FF00) == 0)
{
DAB_pwmDutyASec_ticks = DAB_pwmDutyASec_ticks | 0x000100;
}
//
// If EPS is enabled, subtract half the added delay (alpha p or alpha S) to get the fundamental phase shift.
//
if(DAB_pwmSwState.pwmSwState == pwmSwState_extendedPhaseShiftControl){
float32_t phi_pu = DAB_pwmPhaseShiftPrimSec_pu - ((DAB_pwmEPSAlphaP_pu + DAB_pwmEPSAlphaS_pu) / 2);
DAB_pwmEPSPhaseShift_P1_P2_ns = DAB_pwmEPSAlphaP_pu *
((float32_t)1.0 / DAB_pwmFrequency_Hz) *
(1 / ONE_NANO_SEC);
DAB_pwmEPSPhaseShift_P1_P2_ticks =
(int32_t)((float32_t)DAB_pwmEPSPhaseShift_P1_P2_ns *
DAB_PWMSYSCLOCK_FREQ_HZ * ONE_NANO_SEC *
TWO_RAISED_TO_THE_POWER_SIXTEEN) - ((int32_t) 2 << 16);
if(DAB_pwmEPSPhaseShift_P1_P2_ticks >= 0)
{
DAB_phaseSyncP1_P2CountDirection = EPWM_COUNT_MODE_DOWN_AFTER_SYNC;
//
// DAB_pwmPhaseShiftPrimSec_ticks has the correct value already
//
}
else
{
DAB_phaseSyncP1_P2CountDirection = EPWM_COUNT_MODE_UP_AFTER_SYNC;
DAB_pwmEPSPhaseShift_P1_P2_ticks = DAB_pwmEPSPhaseShift_P1_P2_ticks * -1;
DAB_pwmPhaseShiftP1_P2_HiResticks = ((uint16_t) 0xFF - ((uint16_t)
(DAB_pwmEPSPhaseShift_P1_P2_ticks & 0x0000FFFF) >> 8));
DAB_pwmEPSPhaseShift_P1_P2_ticks =
((DAB_pwmEPSPhaseShift_P1_P2_ticks & 0xFFFF0000) + 0x10000) +
(DAB_pwmPhaseShiftP1_P2_HiResticks << 8);
}
DAB_pwmEPSPhaseShift_P1_S1_ns = (phi_pu + DAB_pwmEPSAlphaP_pu) *
((float32_t)1.0 / DAB_pwmFrequency_Hz) *
(1 / ONE_NANO_SEC);
DAB_pwmEPSPhaseShift_P1_S1_ticks =
(int32_t)((float32_t)DAB_pwmEPSPhaseShift_P1_S1_ns *
DAB_PWMSYSCLOCK_FREQ_HZ * ONE_NANO_SEC *
TWO_RAISED_TO_THE_POWER_SIXTEEN) - ((int32_t)2 << 16);
if(DAB_pwmEPSPhaseShift_P1_S1_ticks >= 0)
{
DAB_phaseSyncP1_S1CountDirection = EPWM_COUNT_MODE_DOWN_AFTER_SYNC;
//
// DAB_pwmPhaseShiftPrimSec_ticks has the correct value already
//
}
else
{
DAB_phaseSyncP1_S1CountDirection = EPWM_COUNT_MODE_UP_AFTER_SYNC;
DAB_pwmEPSPhaseShift_P1_S1_ticks = DAB_pwmEPSPhaseShift_P1_S1_ticks * -1;
DAB_pwmPhaseShiftP1_S1_HiResticks = ((uint16_t) 0xFF - ((uint16_t)
(DAB_pwmEPSPhaseShift_P1_S1_ticks & 0x0000FFFF)>>8));
DAB_pwmEPSPhaseShift_P1_S1_ticks =
((DAB_pwmEPSPhaseShift_P1_S1_ticks & 0xFFFF0000) + 0x10000) +
(DAB_pwmPhaseShiftP1_S1_HiResticks << 8);
}
DAB_pwmEPSPhaseShift_P1_S2_ns = (phi_pu + DAB_pwmEPSAlphaP_pu + DAB_pwmEPSAlphaS_pu) *
((float32_t)1.0 / DAB_pwmFrequency_Hz) *
(1 / ONE_NANO_SEC);
DAB_pwmEPSPhaseShift_P1_S2_ticks =
(int32_t)((float32_t)DAB_pwmEPSPhaseShift_P1_S2_ns *
DAB_PWMSYSCLOCK_FREQ_HZ * ONE_NANO_SEC *
TWO_RAISED_TO_THE_POWER_SIXTEEN) - ((int32_t)2 << 16);
if(DAB_pwmEPSPhaseShift_P1_S2_ticks >= 0)
{
DAB_phaseSyncP1_S2CountDirection = EPWM_COUNT_MODE_DOWN_AFTER_SYNC;
//
// DAB_pwmPhaseShiftPrimSec_ticks has the correct value already
//
}
else
{
DAB_phaseSyncP1_S2CountDirection = EPWM_COUNT_MODE_UP_AFTER_SYNC;
DAB_pwmEPSPhaseShift_P1_S2_ticks = DAB_pwmEPSPhaseShift_P1_S2_ticks * -1;
DAB_pwmPhaseShiftP1_S2_HiResticks = ((uint16_t) 0xFF - ((uint16_t)
(DAB_pwmEPSPhaseShift_P1_S2_ticks & 0x0000FFFF) >> 8));
DAB_pwmEPSPhaseShift_P1_S2_ticks =
((DAB_pwmEPSPhaseShift_P1_S2_ticks & 0xFFFF0000) + 0x10000) +
(DAB_pwmPhaseShiftP1_S2_HiResticks << 8);
}
}
else{
//
// first the phase shift in pu is converter to ns
// this is done for better debug and user friendliness
//
DAB_pwmEPSPhaseShift_P1_S1_ns = DAB_pwmPhaseShiftPrimSec_pu *
((float32_t)1.0 / DAB_pwmFrequency_Hz) *
(1 / ONE_NANO_SEC);
//
// next this ns is simply converted to ticks
//
DAB_pwmEPSPhaseShift_P1_S1_ticks =
(int32_t)((float32_t)DAB_pwmEPSPhaseShift_P1_S1_ns *
DAB_PWMSYSCLOCK_FREQ_HZ * ONE_NANO_SEC *
TWO_RAISED_TO_THE_POWER_SIXTEEN) - ((int32_t)2 << 16);
//
// due to the delay line implementation depending on whether it is
// a phase delay or an advance we need to adjust the
// HR phase shift ticks calculations
//
if(DAB_pwmEPSPhaseShift_P1_S1_ticks >= 0)
{
DAB_phaseSyncP1_S1CountDirection = EPWM_COUNT_MODE_DOWN_AFTER_SYNC;
//
// DAB_pwmPhaseShiftPrimSec_ticks has the correct value already
//
}
else
{
DAB_phaseSyncP1_S1CountDirection = EPWM_COUNT_MODE_UP_AFTER_SYNC;
DAB_pwmEPSPhaseShift_P1_S1_ticks = DAB_pwmEPSPhaseShift_P1_S1_ticks * -1;
DAB_pwmPhaseShiftP1_S1_HiResticks = ((uint16_t) 0xFF - ((uint16_t)
(DAB_pwmEPSPhaseShift_P1_S1_ticks & 0x0000FFFF) >> 8));
DAB_pwmEPSPhaseShift_P1_S1_ticks =
((DAB_pwmEPSPhaseShift_P1_S1_ticks & 0xFFFF0000) + 0x10000) +
(DAB_pwmPhaseShiftP1_S1_HiResticks << 8);
}
DAB_pwmEPSPhaseShift_P1_P2_ticks = 261888; // Hardcoded offset, equivalent to the phase shift in ticks for input of 0.0ns
DAB_phaseSyncP1_P2CountDirection = EPWM_COUNT_MODE_UP_AFTER_SYNC; // Hard coded to correct offset
DAB_pwmEPSPhaseShift_P1_S2_ticks = DAB_pwmEPSPhaseShift_P1_S1_ticks;
DAB_phaseSyncP1_S2CountDirection = DAB_phaseSyncP1_S1CountDirection;
DAB_pwmPhaseShiftPrimSec_ns = DAB_pwmEPSPhaseShift_P1_S1_ns; //just for gui
}
}
根据我的理解、 应该针对所需的整个 HRPWM 相移计算"DAB_pwmPhaseShiftP1_S1_HiResticks"和"DAB_pwmEPSPhaseShift_P1_S1_ticks"的高分辨率节拍、无论是正相移还是负相移。 不过、在代码中、似乎只有在相移为负时才会进行计算。 这是否准确？ 下面这是 正在实施的内容的屏幕截图。
感谢您的帮助！
