580 lines
20 KiB
C
580 lines
20 KiB
C
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/**********************************************************************
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* $Id$ lpc_pwm.c 2011-06-02
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*//**
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* @file lpc_pwm.c
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* @brief Contains all functions support for PWM firmware library
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* on LPC
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* @version 1.0
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* @date 02. June. 2011
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* @author NXP MCU SW Application Team
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*
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* Copyright(C) 2011, NXP Semiconductor
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* All rights reserved.
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*
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***********************************************************************
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* products. This software is supplied "AS IS" without any warranties.
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* NXP Semiconductors assumes no responsibility or liability for the
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* use of the software, conveys no license or title under any patent,
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* copyright, or mask work right to the product. NXP Semiconductors
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* reserves the right to make changes in the software without
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* notification. NXP Semiconductors also make no representation or
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* warranty that such application will be suitable for the specified
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* use without further testing or modification.
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, under NXP Semiconductors'
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* relevant copyright in the software, without fee, provided that it
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* is used in conjunction with NXP Semiconductors microcontrollers. This
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* copyright, permission, and disclaimer notice must appear in all copies of
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* this code.
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**********************************************************************/
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/* Peripheral group ----------------------------------------------------------- */
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/** @addtogroup PWM
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* @{
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*/
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#ifdef __BUILD_WITH_EXAMPLE__
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#include "lpc_libcfg.h"
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#else
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#include "lpc_libcfg_default.h"
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#endif /* __BUILD_WITH_EXAMPLE__ */
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#ifdef _PWM
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/* Includes ------------------------------------------------------------------- */
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#include "lpc_pwm.h"
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#include "lpc_clkpwr.h"
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/* Public Functions ----------------------------------------------------------- */
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/** @addtogroup PWM_Public_Functions
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* @{
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*/
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static LPC_PWM_TypeDef* PWM_GetPointer (uint8_t pwmId);
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/*********************************************************************//**
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* @brief Setting CAN baud rate (bps)
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* @param[in] canId point to LPC_CAN_TypeDef object, should be:
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* - LPC_CAN1: CAN1 peripheral
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* - LPC_CAN2: CAN2 peripheral
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* @return The pointer to CAN peripheral that's expected to use
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***********************************************************************/
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static LPC_PWM_TypeDef* PWM_GetPointer (uint8_t pwmId)
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{
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LPC_PWM_TypeDef* pPwm;
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switch (pwmId)
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{
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case PWM_0:
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pPwm = LPC_PWM0;
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break;
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case PWM_1:
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pPwm = LPC_PWM1;
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break;
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default:
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pPwm = NULL;
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break;
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}
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return pPwm;
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}
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/*********************************************************************//**
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* @brief Check whether specified interrupt flag in PWM is set or not
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* @param[in] pwmId The Id of the expected PWM component
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*
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* @param[in] IntFlag: PWM interrupt flag, should be:
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* - PWM_INTSTAT_MR0: Interrupt flag for PWM match channel 0
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* - PWM_INTSTAT_MR1: Interrupt flag for PWM match channel 1
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* - PWM_INTSTAT_MR2: Interrupt flag for PWM match channel 2
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* - PWM_INTSTAT_MR3: Interrupt flag for PWM match channel 3
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* - PWM_INTSTAT_MR4: Interrupt flag for PWM match channel 4
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* - PWM_INTSTAT_MR5: Interrupt flag for PWM match channel 5
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* - PWM_INTSTAT_MR6: Interrupt flag for PWM match channel 6
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* - PWM_INTSTAT_CAP0: Interrupt flag for capture input 0
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* - PWM_INTSTAT_CAP1: Interrupt flag for capture input 1
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* @return New State of PWM interrupt flag (SET or RESET)
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**********************************************************************/
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IntStatus PWM_GetIntStatus(uint8_t pwmId, uint32_t IntFlag)
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{
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LPC_PWM_TypeDef* pPwm = PWM_GetPointer(pwmId);
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return ((pPwm->IR & IntFlag) ? SET : RESET);
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}
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/*********************************************************************//**
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* @brief Clear specified PWM Interrupt pending
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* @param[in] pwmId The Id of the expected PWM component
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*
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* @param[in] IntFlag: PWM interrupt flag, should be:
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* - PWM_INTSTAT_MR0: Interrupt flag for PWM match channel 0
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* - PWM_INTSTAT_MR1: Interrupt flag for PWM match channel 1
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* - PWM_INTSTAT_MR2: Interrupt flag for PWM match channel 2
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* - PWM_INTSTAT_MR3: Interrupt flag for PWM match channel 3
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* - PWM_INTSTAT_MR4: Interrupt flag for PWM match channel 4
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* - PWM_INTSTAT_MR5: Interrupt flag for PWM match channel 5
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* - PWM_INTSTAT_MR6: Interrupt flag for PWM match channel 6
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* - PWM_INTSTAT_CAP0: Interrupt flag for capture input 0
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* - PWM_INTSTAT_CAP1: Interrupt flag for capture input 1
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* @return None
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**********************************************************************/
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void PWM_ClearIntPending(uint8_t pwmId, uint32_t IntFlag)
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{
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LPC_PWM_TypeDef* pPwm = PWM_GetPointer(pwmId);
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pPwm->IR = IntFlag;
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}
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/*****************************************************************************//**
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* @brief Fills each PWM_InitStruct member with its default value:
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* - If PWMCounterMode = PWM_MODE_TIMER:
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* + PrescaleOption = PWM_TIMER_PRESCALE_USVAL
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* + PrescaleValue = 1
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* - If PWMCounterMode = PWM_MODE_COUNTER:
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* + CountInputSelect = PWM_COUNTER_PCAP1_0
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* + CounterOption = PWM_COUNTER_RISING
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* @param[in] PWMTimerCounterMode Timer or Counter mode, should be:
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* - PWM_MODE_TIMER: Counter of PWM peripheral is in Timer mode
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* - PWM_MODE_COUNTER: Counter of PWM peripheral is in Counter mode
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* @param[in] PWM_InitStruct Pointer to structure (PWM_TIMERCFG_Type or
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* PWM_COUNTERCFG_Type) which will be initialized.
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* @return None
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* Note: PWM_InitStruct pointer will be assigned to corresponding structure
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* (PWM_TIMERCFG_Type or PWM_COUNTERCFG_Type) due to PWMTimerCounterMode.
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*******************************************************************************/
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void PWM_ConfigStructInit(uint8_t PWMTimerCounterMode, void *PWM_InitStruct)
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{
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PWM_TIMERCFG_Type *pTimeCfg;
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PWM_COUNTERCFG_Type *pCounterCfg;
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pTimeCfg = (PWM_TIMERCFG_Type *) PWM_InitStruct;
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pCounterCfg = (PWM_COUNTERCFG_Type *) PWM_InitStruct;
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if (PWMTimerCounterMode == PWM_MODE_TIMER )
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{
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pTimeCfg->PrescaleOption = PWM_TIMER_PRESCALE_USVAL;
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pTimeCfg->PrescaleValue = 1;
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}
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else if (PWMTimerCounterMode == PWM_MODE_COUNTER)
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{
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pCounterCfg->CountInputSelect = PWM_COUNTER_PCAP1_0;
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pCounterCfg->CounterOption = PWM_COUNTER_RISING;
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}
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}
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/*********************************************************************//**
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* @brief Initializes the pPwm peripheral corresponding to the specified
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* parameters in the PWM_ConfigStruct.
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* @param[in] pwmId The Id of the expected PWM component
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*
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*
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* @param[in] PWMTimerCounterMode Timer or Counter mode, should be:
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* - PWM_MODE_TIMER: Counter of PWM peripheral is in Timer mode
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* - PWM_MODE_COUNTER: Counter of PWM peripheral is in Counter mode
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* @param[in] PWM_ConfigStruct Pointer to structure (PWM_TIMERCFG_Type or
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* PWM_COUNTERCFG_Type) which will be initialized.
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* @return None
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* Note: PWM_ConfigStruct pointer will be assigned to corresponding structure
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* (PWM_TIMERCFG_Type or PWM_COUNTERCFG_Type) due to PWMTimerCounterMode.
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**********************************************************************/
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void PWM_Init(uint8_t pwmId, uint32_t PWMTimerCounterMode, void *PWM_ConfigStruct)
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{
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LPC_PWM_TypeDef* pPwm = PWM_GetPointer(pwmId);
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PWM_TIMERCFG_Type *pTimeCfg;
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PWM_COUNTERCFG_Type *pCounterCfg;
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uint64_t clkdlycnt;
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pTimeCfg = (PWM_TIMERCFG_Type *)PWM_ConfigStruct;
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pCounterCfg = (PWM_COUNTERCFG_Type *)PWM_ConfigStruct;
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if(pwmId == PWM_0)
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{
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCPWM0, ENABLE);
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}
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else if(pwmId == PWM_1)
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{
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCPWM1, ENABLE);
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}
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else
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{
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//Trap the error
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while(1);
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}
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// Get peripheral clock of PWM1
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clkdlycnt = CLKPWR_GetCLK(CLKPWR_CLKTYPE_PER);
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// Clear all interrupts pending
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pPwm->IR = 0xFF & PWM_IR_BITMASK;
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pPwm->TCR = 0x00;
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pPwm->CTCR = 0x00;
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pPwm->MCR = 0x00;
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pPwm->CCR = 0x00;
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pPwm->PCR = 0x00;
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pPwm->LER = 0x00;
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if (PWMTimerCounterMode == PWM_MODE_TIMER)
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{
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/* Absolute prescale value */
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if (pTimeCfg->PrescaleOption == PWM_TIMER_PRESCALE_TICKVAL)
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{
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pPwm->PR = pTimeCfg->PrescaleValue - 1;
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}
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/* uSecond prescale value */
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else
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{
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clkdlycnt = (clkdlycnt * pTimeCfg->PrescaleValue) / 1000000;
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pPwm->PR = ((uint32_t) clkdlycnt) - 1;
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}
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}
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else if (PWMTimerCounterMode == PWM_MODE_COUNTER)
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{
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pPwm->CTCR |= (PWM_CTCR_MODE((uint32_t)pCounterCfg->CounterOption)) \
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| (PWM_CTCR_SELECT_INPUT((uint32_t)pCounterCfg->CountInputSelect));
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}
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}
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/*********************************************************************//**
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* @brief De-initializes the PWM peripheral registers to their
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* default reset values.
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* @param[in] pwmId The Id of the expected PWM component
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*
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* @return None
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**********************************************************************/
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void PWM_DeInit (uint8_t pwmId)
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{
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LPC_PWM_TypeDef* pPwm = PWM_GetPointer(pwmId);
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// Disable PWM control (timer, counter and PWM)
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pPwm->TCR = 0x00;
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if(pwmId == PWM_0)
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{
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCPWM0, DISABLE);
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}
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else if(pwmId == PWM_1)
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{
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCPWM1, DISABLE);
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}
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}
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/*********************************************************************//**
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* @brief Enable/Disable PWM peripheral
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* @param[in] pwmId The Id of the expected PWM component
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*
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* @param[in] NewState New State of this function, should be:
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* - ENABLE: Enable PWM peripheral
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* - DISABLE: Disable PWM peripheral
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* @return None
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**********************************************************************/
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void PWM_Cmd(uint8_t pwmId, FunctionalState NewState)
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{
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LPC_PWM_TypeDef* pPwm = PWM_GetPointer(pwmId);
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if (NewState == ENABLE)
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{
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pPwm->TCR |= PWM_TCR_PWM_ENABLE;
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}
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else
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{
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pPwm->TCR &= (~PWM_TCR_PWM_ENABLE) & PWM_TCR_BITMASK;
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}
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}
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/*********************************************************************//**
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* @brief Enable/Disable Counter in PWM peripheral
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* @param[in] pwmId The Id of the expected PWM component
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*
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* @param[in] NewState New State of this function, should be:
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* - ENABLE: Enable Counter in PWM peripheral
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* - DISABLE: Disable Counter in PWM peripheral
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* @return None
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**********************************************************************/
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void PWM_CounterCmd(uint8_t pwmId, FunctionalState NewState)
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{
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LPC_PWM_TypeDef* pPwm = PWM_GetPointer(pwmId);
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if (NewState == ENABLE)
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{
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pPwm->TCR |= PWM_TCR_COUNTER_ENABLE;
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}
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else
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{
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pPwm->TCR &= (~PWM_TCR_COUNTER_ENABLE) & PWM_TCR_BITMASK;
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}
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}
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/*********************************************************************//**
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* @brief Reset Counter in PWM peripheral
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* @param[in] pwmId The Id of the expected PWM component
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*
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* @return None
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**********************************************************************/
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void PWM_ResetCounter(uint8_t pwmId)
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{
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LPC_PWM_TypeDef* pPwm = PWM_GetPointer(pwmId);
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pPwm->TCR |= PWM_TCR_COUNTER_RESET;
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pPwm->TCR &= (~PWM_TCR_COUNTER_RESET) & PWM_TCR_BITMASK;
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}
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/*********************************************************************//**
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* @brief Configures match for PWM peripheral
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* @param[in] pwmId The Id of the expected PWM component
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*
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* @param[in] PWM_MatchConfigStruct Pointer to a PWM_MATCHCFG_Type structure
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* that contains the configuration information for the
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* specified PWM match function.
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* @return None
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**********************************************************************/
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void PWM_ConfigMatch(uint8_t pwmId, PWM_MATCHCFG_Type *PWM_MatchConfigStruct)
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{
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LPC_PWM_TypeDef* pPwm = PWM_GetPointer(pwmId);
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//interrupt on MRn
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if (PWM_MatchConfigStruct->IntOnMatch == ENABLE)
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{
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pPwm->MCR |= PWM_MCR_INT_ON_MATCH(PWM_MatchConfigStruct->MatchChannel);
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}
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else
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{
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pPwm->MCR &= (~ PWM_MCR_INT_ON_MATCH(PWM_MatchConfigStruct->MatchChannel)) \
|
||
|
|
& PWM_MCR_BITMASK;
|
||
|
|
}
|
||
|
|
|
||
|
|
//reset on MRn
|
||
|
|
if (PWM_MatchConfigStruct->ResetOnMatch == ENABLE)
|
||
|
|
{
|
||
|
|
pPwm->MCR |= PWM_MCR_RESET_ON_MATCH(PWM_MatchConfigStruct->MatchChannel);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
pPwm->MCR &= (~ PWM_MCR_RESET_ON_MATCH(PWM_MatchConfigStruct->MatchChannel)) \
|
||
|
|
& PWM_MCR_BITMASK;
|
||
|
|
}
|
||
|
|
|
||
|
|
//stop on MRn
|
||
|
|
if (PWM_MatchConfigStruct->StopOnMatch == ENABLE)
|
||
|
|
{
|
||
|
|
pPwm->MCR |= PWM_MCR_STOP_ON_MATCH(PWM_MatchConfigStruct->MatchChannel);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
pPwm->MCR &= (~ PWM_MCR_STOP_ON_MATCH(PWM_MatchConfigStruct->MatchChannel)) \
|
||
|
|
& PWM_MCR_BITMASK;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*********************************************************************//**
|
||
|
|
* @brief Configures capture input for PWM peripheral
|
||
|
|
* @param[in] pwmId The Id of the expected PWM component
|
||
|
|
*
|
||
|
|
* @param[in] PWM_CaptureConfigStruct Pointer to a PWM_CAPTURECFG_Type structure
|
||
|
|
* that contains the configuration information for the
|
||
|
|
* specified PWM capture input function.
|
||
|
|
* @return None
|
||
|
|
**********************************************************************/
|
||
|
|
void PWM_ConfigCapture(uint8_t pwmId, PWM_CAPTURECFG_Type *PWM_CaptureConfigStruct)
|
||
|
|
{
|
||
|
|
LPC_PWM_TypeDef* pPwm = PWM_GetPointer(pwmId);
|
||
|
|
|
||
|
|
if (PWM_CaptureConfigStruct->RisingEdge == ENABLE)
|
||
|
|
{
|
||
|
|
pPwm->CCR |= PWM_CCR_CAP_RISING(PWM_CaptureConfigStruct->CaptureChannel);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
pPwm->CCR &= (~ PWM_CCR_CAP_RISING(PWM_CaptureConfigStruct->CaptureChannel)) \
|
||
|
|
& PWM_CCR_BITMASK;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (PWM_CaptureConfigStruct->FallingEdge == ENABLE)
|
||
|
|
{
|
||
|
|
pPwm->CCR |= PWM_CCR_CAP_FALLING(PWM_CaptureConfigStruct->CaptureChannel);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
pPwm->CCR &= (~ PWM_CCR_CAP_FALLING(PWM_CaptureConfigStruct->CaptureChannel)) \
|
||
|
|
& PWM_CCR_BITMASK;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (PWM_CaptureConfigStruct->IntOnCaption == ENABLE)
|
||
|
|
{
|
||
|
|
pPwm->CCR |= PWM_CCR_INT_ON_CAP(PWM_CaptureConfigStruct->CaptureChannel);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
pPwm->CCR &= (~ PWM_CCR_INT_ON_CAP(PWM_CaptureConfigStruct->CaptureChannel)) \
|
||
|
|
& PWM_CCR_BITMASK;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*********************************************************************//**
|
||
|
|
* @brief Read value of capture register PWM peripheral
|
||
|
|
* @param[in] pwmId The Id of the expected PWM component
|
||
|
|
*
|
||
|
|
* @param[in] CaptureChannel: capture channel number, should be in
|
||
|
|
* range 0 to 1
|
||
|
|
* @return Value of capture register
|
||
|
|
**********************************************************************/
|
||
|
|
uint32_t PWM_GetCaptureValue(uint8_t pwmId, uint8_t CaptureChannel)
|
||
|
|
{
|
||
|
|
LPC_PWM_TypeDef* pPwm = PWM_GetPointer(pwmId);
|
||
|
|
|
||
|
|
switch (CaptureChannel)
|
||
|
|
{
|
||
|
|
case 0:
|
||
|
|
return pPwm->CR0;
|
||
|
|
|
||
|
|
case 1:
|
||
|
|
return pPwm->CR1;
|
||
|
|
|
||
|
|
default:
|
||
|
|
return (0);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/********************************************************************//**
|
||
|
|
* @brief Update value for each PWM channel with update type option
|
||
|
|
* @param[in] pwmId The Id of the expected PWM component
|
||
|
|
*
|
||
|
|
* @param[in] MatchChannel Match channel
|
||
|
|
* @param[in] MatchValue Match value
|
||
|
|
* @param[in] UpdateType Type of Update, should be:
|
||
|
|
* - PWM_MATCH_UPDATE_NOW: The update value will be updated for
|
||
|
|
* this channel immediately
|
||
|
|
* - PWM_MATCH_UPDATE_NEXT_RST: The update value will be updated for
|
||
|
|
* this channel on next reset by a PWM Match event.
|
||
|
|
* @return None
|
||
|
|
*********************************************************************/
|
||
|
|
void PWM_MatchUpdate(uint8_t pwmId, uint8_t MatchChannel,
|
||
|
|
uint32_t MatchValue, uint8_t UpdateType)
|
||
|
|
{
|
||
|
|
LPC_PWM_TypeDef* pPwm = PWM_GetPointer(pwmId);
|
||
|
|
|
||
|
|
switch (MatchChannel)
|
||
|
|
{
|
||
|
|
case 0:
|
||
|
|
pPwm->MR0 = MatchValue;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 1:
|
||
|
|
pPwm->MR1 = MatchValue;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 2:
|
||
|
|
pPwm->MR2 = MatchValue;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 3:
|
||
|
|
pPwm->MR3 = MatchValue;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 4:
|
||
|
|
pPwm->MR4 = MatchValue;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 5:
|
||
|
|
pPwm->MR5 = MatchValue;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 6:
|
||
|
|
pPwm->MR6 = MatchValue;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Write Latch register
|
||
|
|
pPwm->LER |= PWM_LER_EN_MATCHn_LATCH(MatchChannel);
|
||
|
|
|
||
|
|
// In case of update now
|
||
|
|
if (UpdateType == PWM_MATCH_UPDATE_NOW)
|
||
|
|
{
|
||
|
|
pPwm->TCR |= PWM_TCR_COUNTER_RESET;
|
||
|
|
pPwm->TCR &= (~PWM_TCR_COUNTER_RESET) & PWM_TCR_BITMASK;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/********************************************************************//**
|
||
|
|
* @brief Configure Edge mode for each PWM channel
|
||
|
|
* @param[in] pwmId The Id of the expected PWM component
|
||
|
|
*
|
||
|
|
* @param[in] PWMChannel PWM channel, should be in range from 2 to 6
|
||
|
|
* @param[in] ModeOption PWM mode option, should be:
|
||
|
|
* - PWM_CHANNEL_SINGLE_EDGE: Single Edge mode
|
||
|
|
* - PWM_CHANNEL_DUAL_EDGE: Dual Edge mode
|
||
|
|
* @return None
|
||
|
|
* Note: PWM Channel 1 can not be selected for mode option
|
||
|
|
*********************************************************************/
|
||
|
|
void PWM_ChannelConfig(uint8_t pwmId, uint8_t PWMChannel, uint8_t ModeOption)
|
||
|
|
{
|
||
|
|
LPC_PWM_TypeDef* pPwm = PWM_GetPointer(pwmId);
|
||
|
|
|
||
|
|
// Single edge mode
|
||
|
|
if (ModeOption == PWM_CHANNEL_SINGLE_EDGE)
|
||
|
|
{
|
||
|
|
pPwm->PCR &= (~ PWM_PCR_PWMSELn(PWMChannel)) & PWM_PCR_BITMASK;
|
||
|
|
}
|
||
|
|
// Double edge mode
|
||
|
|
else if (PWM_CHANNEL_DUAL_EDGE)
|
||
|
|
{
|
||
|
|
pPwm->PCR |= PWM_PCR_PWMSELn(PWMChannel);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/********************************************************************//**
|
||
|
|
* @brief Enable/Disable PWM channel output
|
||
|
|
* @param[in] pwmId The Id of the expected PWM component
|
||
|
|
*
|
||
|
|
* @param[in] PWMChannel PWM channel, should be in range from 1 to 6
|
||
|
|
* @param[in] NewState New State of this function, should be:
|
||
|
|
* - ENABLE: Enable this PWM channel output
|
||
|
|
* - DISABLE: Disable this PWM channel output
|
||
|
|
* @return None
|
||
|
|
*********************************************************************/
|
||
|
|
void PWM_ChannelCmd(uint8_t pwmId, uint8_t PWMChannel, FunctionalState NewState)
|
||
|
|
{
|
||
|
|
LPC_PWM_TypeDef* pPwm = PWM_GetPointer(pwmId);
|
||
|
|
|
||
|
|
if (NewState == ENABLE)
|
||
|
|
{
|
||
|
|
pPwm->PCR |= PWM_PCR_PWMENAn(PWMChannel);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
pPwm->PCR &= (~ PWM_PCR_PWMENAn(PWMChannel)) & PWM_PCR_BITMASK;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @}
|
||
|
|
*/
|
||
|
|
|
||
|
|
#endif /*_PWM*/
|
||
|
|
/**
|
||
|
|
* @}
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* --------------------------------- End Of File ------------------------------ */
|