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609 lines
18 KiB
C
609 lines
18 KiB
C
/* ----------------------------------------------------------------------------
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* ATMEL Microcontroller Software Support
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* ----------------------------------------------------------------------------
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* Copyright (c) 2009, Atmel Corporation
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*
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* All rights reserved.
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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 are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the disclaimer below.
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*
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* Atmel's name may not be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* ----------------------------------------------------------------------------
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*/
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/** \addtogroup pwm_module Working with PWM
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* The PWM driver provides the interface to configure and use the PWM
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* peripheral.
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*
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* The PWM macrocell controls square output waveforms of 4 channels.
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* Characteristics of output waveforms such as period, duty-cycle,
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* dead-time can be configured.\n
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* Some of PWM channels can be linked together as synchronous channel and
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* duty-cycle of synchronous channels can be updated by PDC automaticly.
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*
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* Before enabling the channels, they must have been configured first.
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* The main settings include:
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* <ul>
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* <li>Configuration of the clock generator.</li>
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* <li>Selection of the clock for each channel.</li>
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* <li>Configuration of output waveform characteristics, such as period, duty-cycle etc.</li>
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* <li>Configuration for synchronous channels if needed.</li>
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* - Selection of the synchronous channels.
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* - Selection of the moment when the WRDY flag and the corresponding PDC
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* transfer request are set (PTRM and PTRCS in the PWM_SCM register).
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* - Configuration of the update mode (UPDM in the PWM_SCM register).
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* - Configuration of the update period (UPR in the PWM_SCUP register).
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* </ul>
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*
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* After the channels is enabled, the user must use respective update registers
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* to change the wave characteristics to prevent unexpected output waveform.
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* i.e. PWM_CDTYUPDx register should be used if user want to change duty-cycle
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* when the channel is enabled.
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*
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* For more accurate information, please look at the PWM section of the
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* Datasheet.
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*
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* Related files :\n
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* \ref pwmc.c\n
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* \ref pwmc.h.\n
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*/
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/*@{*/
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/*@}*/
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/**
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* \file
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*
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* Implementation of the Pulse Width Modulation Controller (PWM) peripheral.
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*
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*/
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/*----------------------------------------------------------------------------
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* Headers
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*----------------------------------------------------------------------------*/
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#include "chip.h"
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#include <stdint.h>
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#include <assert.h>
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/*----------------------------------------------------------------------------
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* Local functions
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*----------------------------------------------------------------------------*/
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/**
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* \brief Finds a prescaler/divisor couple to generate the desired frequency
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* from MCK.
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*
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* Returns the value to enter in PWM_CLK or 0 if the configuration cannot be
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* met.
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*
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* \param frequency Desired frequency in Hz.
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* \param mck Master clock frequency in Hz.
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*/
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static uint16_t FindClockConfiguration(
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uint32_t frequency,
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uint32_t mck)
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{
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uint32_t divisors[11] = {1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024};
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uint8_t divisor = 0;
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uint32_t prescaler;
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assert(frequency < mck);
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/* Find prescaler and divisor values */
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prescaler = (mck / divisors[divisor]) / frequency;
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while ((prescaler > 255) && (divisor < 11)) {
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divisor++;
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prescaler = (mck / divisors[divisor]) / frequency;
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}
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/* Return result */
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if ( divisor < 11 )
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{
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// TRACE_DEBUG( "Found divisor=%u and prescaler=%u for freq=%uHz\n\r", divisors[divisor], prescaler, frequency ) ;
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return prescaler | (divisor << 8) ;
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}
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else
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{
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return 0 ;
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}
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}
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/*----------------------------------------------------------------------------
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* Exported functions
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*----------------------------------------------------------------------------*/
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/**
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* \brief Configures PWM a channel with the given parameters, basic configure function.
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*
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* The PWM controller must have been clocked in the PMC prior to calling this
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* function.
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* Beware: this function disables the channel. It waits until disable is effective.
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*
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* \param channel Channel number.
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* \param prescaler Channel prescaler.
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* \param alignment Channel alignment.
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* \param polarity Channel polarity.
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*/
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void PWMC_ConfigureChannel(
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Pwm* pPwm,
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uint8_t channel,
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uint32_t prescaler,
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uint32_t alignment,
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uint32_t polarity)
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{
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pPwm->PWM_CH_NUM[0].PWM_CMR = 1;
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// assert(prescaler < PWM_CMR0_CPRE_MCKB);
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assert((alignment & (uint32_t)~PWM_CMR_CALG) == 0);
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assert((polarity & (uint32_t)~PWM_CMR_CPOL) == 0);
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/* Disable channel (effective at the end of the current period) */
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if ((pPwm->PWM_SR & (1 << channel)) != 0) {
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pPwm->PWM_DIS = 1 << channel;
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while ((pPwm->PWM_SR & (1 << channel)) != 0);
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}
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/* Configure channel */
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pPwm->PWM_CH_NUM[channel].PWM_CMR = prescaler | alignment | polarity;
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}
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/**
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* \brief Configures PWM a channel with the given parameters, extend configure function.
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*
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* The PWM controller must have been clocked in the PMC prior to calling this
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* function.
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* Beware: this function disables the channel. It waits until disable is effective.
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*
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* \param channel Channel number.
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* \param prescaler Channel prescaler.
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* \param alignment Channel alignment.
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* \param polarity Channel polarity.
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* \param countEventSelect Channel counter event selection.
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* \param DTEnable Channel dead time generator enable.
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* \param DTHInverte Channel Dead-Time PWMHx output Inverted.
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* \param DTLInverte Channel Dead-Time PWMHx output Inverted.
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*/
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void PWMC_ConfigureChannelExt(
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Pwm* pPwm,
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uint8_t channel,
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uint32_t prescaler,
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uint32_t alignment,
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uint32_t polarity,
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uint32_t countEventSelect,
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uint32_t DTEnable,
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uint32_t DTHInverte,
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uint32_t DTLInverte)
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{
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// assert(prescaler < PWM_CMR0_CPRE_MCKB);
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assert((alignment & (uint32_t)~PWM_CMR_CALG) == 0);
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assert((polarity & (uint32_t)~PWM_CMR_CPOL) == 0);
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assert((countEventSelect & (uint32_t)~PWM_CMR_CES) == 0);
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assert((DTEnable & (uint32_t)~PWM_CMR_DTE) == 0);
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assert((DTHInverte & (uint32_t)~PWM_CMR_DTHI) == 0);
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assert((DTLInverte & (uint32_t)~PWM_CMR_DTLI) == 0);
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/* Disable channel (effective at the end of the current period) */
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if ((pPwm->PWM_SR & (1 << channel)) != 0) {
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pPwm->PWM_DIS = 1 << channel;
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while ((pPwm->PWM_SR & (1 << channel)) != 0);
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}
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/* Configure channel */
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pPwm->PWM_CH_NUM[channel].PWM_CMR = prescaler | alignment | polarity |
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countEventSelect | DTEnable | DTHInverte | DTLInverte;
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}
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/**
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* \brief Configures PWM clocks A & B to run at the given frequencies.
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*
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* This function finds the best MCK divisor and prescaler values automatically.
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*
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* \param clka Desired clock A frequency (0 if not used).
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* \param clkb Desired clock B frequency (0 if not used).
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* \param mck Master clock frequency.
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*/
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void PWMC_ConfigureClocks(uint32_t clka, uint32_t clkb, uint32_t mck)
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{
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uint32_t mode = 0;
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uint32_t result;
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/* Clock A */
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if (clka != 0) {
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result = FindClockConfiguration(clka, mck);
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assert( result != 0 ) ;
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mode |= result;
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}
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/* Clock B */
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if (clkb != 0) {
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result = FindClockConfiguration(clkb, mck);
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assert( result != 0 ) ;
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mode |= (result << 16);
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}
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/* Configure clocks */
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// TRACE_DEBUG( "Setting PWM_CLK = 0x%08X\n\r", mode ) ;
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PWM->PWM_CLK = mode;
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}
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/**
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* \brief Sets the period value used by a PWM channel.
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*
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* This function writes directly to the CPRD register if the channel is disabled;
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* otherwise, it uses the update register CPRDUPD.
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*
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* \param channel Channel number.
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* \param period Period value.
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*/
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void PWMC_SetPeriod( Pwm* pPwm, uint8_t channel, uint16_t period)
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{
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/* If channel is disabled, write to CPRD */
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if ((pPwm->PWM_SR & (1 << channel)) == 0) {
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pPwm->PWM_CH_NUM[channel].PWM_CPRD = period;
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}
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/* Otherwise use update register */
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else {
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pPwm->PWM_CH_NUM[channel].PWM_CPRDUPD = period;
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}
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}
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/**
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* \brief Sets the duty cycle used by a PWM channel.
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* This function writes directly to the CDTY register if the channel is disabled;
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* otherwise it uses the update register CDTYUPD.
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* Note that the duty cycle must always be inferior or equal to the channel
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* period.
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*
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* \param channel Channel number.
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* \param duty Duty cycle value.
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*/
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void PWMC_SetDutyCycle( Pwm* pPwm, uint8_t channel, uint16_t duty)
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{
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assert(duty <= pPwm->PWM_CH_NUM[channel].PWM_CPRD);
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/* If channel is disabled, write to CDTY */
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if ((pPwm->PWM_SR & (1 << channel)) == 0) {
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pPwm->PWM_CH_NUM[channel].PWM_CDTY = duty;
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}
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/* Otherwise use update register */
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else {
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pPwm->PWM_CH_NUM[channel].PWM_CDTYUPD = duty;
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}
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}
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/**
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* \brief Sets the dead time used by a PWM channel.
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* This function writes directly to the DT register if the channel is disabled;
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* otherwise it uses the update register DTUPD.
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* Note that the dead time must always be inferior or equal to the channel
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* period.
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*
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* \param channel Channel number.
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* \param timeH Dead time value for PWMHx output.
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* \param timeL Dead time value for PWMLx output.
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*/
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void PWMC_SetDeadTime( Pwm* pPwm, uint8_t channel, uint16_t timeH, uint16_t timeL)
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{
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assert(timeH <= pPwm->PWM_CH_NUM[channel].PWM_CPRD);
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assert(timeL <= pPwm->PWM_CH_NUM[channel].PWM_CPRD);
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/* If channel is disabled, write to DT */
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if ((pPwm->PWM_SR & (1 << channel)) == 0) {
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pPwm->PWM_CH_NUM[channel].PWM_DT = timeH | (timeL << 16);
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}
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/* Otherwise use update register */
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else {
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pPwm->PWM_CH_NUM[channel].PWM_DTUPD = timeH | (timeL << 16);
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}
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}
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/**
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* \brief Configures Syncronous channel with the given parameters.
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* Beware: At this time, the channels should be disabled.
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*
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* \param channels Bitwise OR of Syncronous channels.
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* \param updateMode Syncronous channel update mode.
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* \param requestMode PDC transfer request mode.
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* \param requestComparisonSelect PDC transfer request comparison selection.
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*/
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void PWMC_ConfigureSyncChannel( Pwm* pPwm,
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uint32_t channels,
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uint32_t updateMode,
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uint32_t requestMode,
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uint32_t requestComparisonSelect)
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{
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pPwm->PWM_SCM = channels | updateMode | requestMode | requestComparisonSelect;
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}
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/**
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* \brief Sets the update period of the synchronous channels.
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* This function writes directly to the SCUP register if the channel #0 is disabled;
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* otherwise it uses the update register SCUPUPD.
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*
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* \param period update period.
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*/
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void PWMC_SetSyncChannelUpdatePeriod( Pwm* pPwm, uint8_t period)
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{
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/* If channel is disabled, write to SCUP */
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if ((pPwm->PWM_SR & (1 << 0)) == 0) {
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pPwm->PWM_SCUP = period;
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}
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/* Otherwise use update register */
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else {
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pPwm->PWM_SCUPUPD = period;
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}
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}
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/**
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* \brief Sets synchronous channels update unlock.
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*
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* Note: If the UPDM field is set to 0, writing the UPDULOCK bit to 1
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* triggers the update of the period value, the duty-cycle and
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* the dead-time values of synchronous channels at the beginning
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* of the next PWM period. If the field UPDM is set to 1 or 2,
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* writing the UPDULOCK bit to 1 triggers only the update of
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* the period value and of the dead-time values of synchronous channels.
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* This bit is automatically reset when the update is done.
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*/
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void PWMC_SetSyncChannelUpdateUnlock( Pwm* pPwm )
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{
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pPwm->PWM_SCUC = PWM_SCUC_UPDULOCK;
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}
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/**
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* \brief Enables the given PWM channel.
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*
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* This does NOT enable the corresponding pin;this must be done in the user code.
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*
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* \param channel Channel number.
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*/
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void PWMC_EnableChannel( Pwm* pPwm, uint8_t channel)
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{
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pPwm->PWM_ENA = 1 << channel;
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}
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/**
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* \brief Disables the given PWM channel.
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*
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* Beware, channel will be effectively disabled at the end of the current period.
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* Application can check channel is disabled using the following wait loop:
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* while ((PWM->PWM_SR & (1 << channel)) != 0);
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*
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* \param channel Channel number.
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*/
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void PWMC_DisableChannel( Pwm* pPwm, uint8_t channel)
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{
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pPwm->PWM_DIS = 1 << channel;
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}
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/**
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* \brief Enables the period interrupt for the given PWM channel.
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*
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* \param channel Channel number.
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*/
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void PWMC_EnableChannelIt( Pwm* pPwm, uint8_t channel)
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{
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pPwm->PWM_IER1 = 1 << channel;
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}
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/**
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* \brief Disables the period interrupt for the given PWM channel.
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*
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* \param channel Channel number.
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*/
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void PWMC_DisableChannelIt( Pwm* pPwm, uint8_t channel)
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{
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pPwm->PWM_IDR1 = 1 << channel;
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}
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/**
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* \brief Enables the selected interrupts sources on a PWMC peripheral.
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*
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* \param sources1 Bitwise OR of selected interrupt sources of PWM_IER1.
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* \param sources2 Bitwise OR of selected interrupt sources of PWM_IER2.
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*/
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void PWMC_EnableIt( Pwm* pPwm, uint32_t sources1, uint32_t sources2)
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{
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pPwm->PWM_IER1 = sources1;
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pPwm->PWM_IER2 = sources2;
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}
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/**
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* \brief Disables the selected interrupts sources on a PWMC peripheral.
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*
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* \param sources1 Bitwise OR of selected interrupt sources of PWM_IDR1.
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* \param sources2 Bitwise OR of selected interrupt sources of PWM_IDR2.
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*/
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void PWMC_DisableIt( Pwm* pPwm, uint32_t sources1, uint32_t sources2)
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{
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pPwm->PWM_IDR1 = sources1;
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pPwm->PWM_IDR2 = sources2;
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}
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/**
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* \brief Sends the contents of buffer through a PWMC peripheral, using the PDC to
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* take care of the transfer.
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*
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* Note: Duty cycle of syncronous channels can update by PDC
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* when the field UPDM (Update Mode) in the PWM_SCM register is set to 2.
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*
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* \param pwmc Pointer to an Pwm instance.
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* \param buffer Data buffer to send.
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* \param length Length of the data buffer.
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*/
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uint8_t PWMC_WriteBuffer(Pwm *pwmc,
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void *buffer,
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uint32_t length)
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{
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/* Check if first bank is free */
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if (pwmc->PWM_TCR == 0) {
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pwmc->PWM_TPR = (uint32_t) buffer;
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pwmc->PWM_TCR = length;
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pwmc->PWM_PTCR = PERIPH_PTCR_TXTEN;
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return 1;
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}
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/* Check if second bank is free */
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else if (pwmc->PWM_TNCR == 0) {
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pwmc->PWM_TNPR = (uint32_t) buffer;
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pwmc->PWM_TNCR = length;
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return 1;
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}
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/* No free banks */
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return 0;
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}
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/**
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* \brief Set PWM output override value.
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*
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* \param value Bitwise OR of output override value.
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*/
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void PWMC_SetOverrideValue( Pwm* pPwm, uint32_t value)
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{
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pPwm->PWM_OOV = value;
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}
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/**
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* \brief Enalbe override output.
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*
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* \param value Bitwise OR of output selection.
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* \param sync 0: enable the output asyncronously, 1: enable it syncronously
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*/
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void PWMC_EnableOverrideOutput( Pwm* pPwm, uint32_t value, uint32_t sync)
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{
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if (sync) {
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pPwm->PWM_OSSUPD = value;
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|
} else {
|
|
|
|
pPwm->PWM_OSS = value;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* \brief Disalbe override output.
|
|
*
|
|
* \param value Bitwise OR of output selection.
|
|
* \param sync 0: enable the output asyncronously, 1: enable it syncronously
|
|
*/
|
|
void PWMC_DisableOverrideOutput( Pwm* pPwm, uint32_t value, uint32_t sync)
|
|
{
|
|
if (sync) {
|
|
|
|
pPwm->PWM_OSCUPD = value;
|
|
} else {
|
|
|
|
pPwm->PWM_OSC = value;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* \brief Set PWM fault mode.
|
|
*
|
|
* \param mode Bitwise OR of fault mode.
|
|
*/
|
|
void PWMC_SetFaultMode( Pwm* pPwm, uint32_t mode)
|
|
{
|
|
pPwm->PWM_FMR = mode;
|
|
}
|
|
|
|
/**
|
|
* \brief PWM fault clear.
|
|
*
|
|
* \param fault Bitwise OR of fault to clear.
|
|
*/
|
|
void PWMC_FaultClear( Pwm* pPwm, uint32_t fault)
|
|
{
|
|
pPwm->PWM_FCR = fault;
|
|
}
|
|
|
|
/**
|
|
* \brief Set PWM fault protection value.
|
|
*
|
|
* \param value Bitwise OR of fault protection value.
|
|
*/
|
|
void PWMC_SetFaultProtectionValue( Pwm* pPwm, uint32_t value)
|
|
{
|
|
pPwm->PWM_FPV = value;
|
|
}
|
|
|
|
/**
|
|
* \brief Enable PWM fault protection.
|
|
*
|
|
* \param value Bitwise OR of FPEx[y].
|
|
*/
|
|
void PWMC_EnableFaultProtection( Pwm* pPwm, uint32_t value)
|
|
{
|
|
pPwm->PWM_FPE = value;
|
|
}
|
|
|
|
/**
|
|
* \brief Configure comparison unit.
|
|
*
|
|
* \param x comparison x index
|
|
* \param value comparison x value.
|
|
* \param mode comparison x mode
|
|
*/
|
|
void PWMC_ConfigureComparisonUnit( Pwm* pPwm, uint32_t x, uint32_t value, uint32_t mode)
|
|
{
|
|
assert(x < 8);
|
|
|
|
/* If channel is disabled, write to CMPxM & CMPxV */
|
|
if ((pPwm->PWM_SR & (1 << 0)) == 0) {
|
|
pPwm->PWM_CMP[x].PWM_CMPxM = mode;
|
|
pPwm->PWM_CMP[x].PWM_CMPxV = value;
|
|
}
|
|
/* Otherwise use update register */
|
|
else {
|
|
pPwm->PWM_CMP[x].PWM_CMPxMUPD = mode;
|
|
pPwm->PWM_CMP[x].PWM_CMPxVUPD = value;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* \brief Configure event line mode.
|
|
*
|
|
* \param x Line x
|
|
* \param mode Bitwise OR of line mode selection
|
|
*/
|
|
void PWMC_ConfigureEventLineMode( Pwm* pPwm, uint32_t x, uint32_t mode)
|
|
{
|
|
assert(x < 2);
|
|
|
|
if (x == 0) {
|
|
pPwm->PWM_ELxMR[0] = mode;
|
|
} else if (x == 1) {
|
|
pPwm->PWM_ELxMR[1] = mode;
|
|
}
|
|
}
|