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