87 lines
3.2 KiB
C
87 lines
3.2 KiB
C
/*
|
|
* Copyright (C) 2023 Texas Instruments Incorporated
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* Neither the name of Texas Instruments Incorporated nor the names of
|
|
* its contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
#include <drivers/epwm.h>
|
|
#include <drivers/hw_include/hw_types.h>
|
|
#include <drivers/hw_include/csl_types.h>
|
|
#include "epwm_drv_aux.h"
|
|
|
|
#include <math.h>
|
|
|
|
/* Configure PWM Time base counter Frequency/Period */
|
|
void tbPwmFreqCfg(
|
|
uint32_t baseAddr,
|
|
uint32_t tbClk,
|
|
uint32_t pwmFreq,
|
|
uint32_t counterDir,
|
|
uint32_t enableShadowWrite,
|
|
uint32_t *pPeriodCount
|
|
)
|
|
{
|
|
uint32_t tbPeriodCount;
|
|
float tbPeriodCount_f;
|
|
uint32_t regVal = 0U;
|
|
|
|
regVal = HW_RD_REG16(baseAddr + PWMSS_EPWM_TBCTL);
|
|
HW_SET_FIELD32(regVal, PWMSS_EPWM_TBCTL_PRDLD, enableShadowWrite);
|
|
HW_SET_FIELD32(regVal, PWMSS_EPWM_TBCTL_CTRMODE, counterDir);
|
|
HW_WR_REG16((baseAddr + PWMSS_EPWM_TBCTL),
|
|
(uint16_t)regVal);
|
|
|
|
/* compute period using floating point */
|
|
tbPeriodCount_f = (float)tbClk / pwmFreq;
|
|
if (EPWM_TB_COUNTER_DIR_UP_DOWN == counterDir) {
|
|
tbPeriodCount_f = tbPeriodCount_f / 2.0;
|
|
}
|
|
tbPeriodCount_f = roundf(tbPeriodCount_f);
|
|
tbPeriodCount = (uint32_t)tbPeriodCount_f;
|
|
|
|
#if 0 /* use this in case there is some reason not to use floating point */
|
|
/* compute period using fixed point */
|
|
tbPeriodCount = tbClk << 4; /* U32Q4 */
|
|
tbPeriodCount /= pwmFreq;
|
|
if (EPWM_TB_COUNTER_DIR_UP_DOWN == counterDir) {
|
|
tbPeriodCount /= 2;
|
|
}
|
|
tbPeriodCount += 1<<3; /* biased rouding to 0.5 */
|
|
tbPeriodCount >>= 4; /* U32Q0 */
|
|
#endif
|
|
|
|
regVal = (counterDir == EPWM_TB_COUNTER_DIR_UP_DOWN) ?
|
|
tbPeriodCount : tbPeriodCount-1;
|
|
HW_WR_REG16((baseAddr + PWMSS_EPWM_TBPRD),
|
|
(uint16_t)regVal);
|
|
|
|
*pPeriodCount = tbPeriodCount;
|
|
}
|