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115 lines
3.2 KiB
C
115 lines
3.2 KiB
C
/**
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******************************************************************************
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* @file platform_pwm.c
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* @author William Xu
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* @version V1.0.0
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* @date 05-May-2014
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* @brief This file provide PWM driver functions.
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******************************************************************************
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* UNPUBLISHED PROPRIETARY SOURCE CODE
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* Copyright (c) 2016 MXCHIP Inc.
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*
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* The contents of this file may not be disclosed to third parties, copied or
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* duplicated in any form, in whole or in part, without the prior written
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* permission of MXCHIP Corporation.
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******************************************************************************
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*/
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#include "platform.h"
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#include "platform_peripheral.h"
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#include "debug.h"
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/******************************************************
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* Constants
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******************************************************/
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/******************************************************
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* Enumerations
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******************************************************/
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/******************************************************
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* Type Definitions
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******************************************************/
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/******************************************************
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* Structures
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******************************************************/
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/******************************************************
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* Variables Definitions
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******************************************************/
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/******************************************************
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* Function Declarations
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******************************************************/
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/******************************************************
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* Function Definitions
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******************************************************/
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/**
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* Initialise PWM interface
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*
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* @param[in] pwm_interface : PWM interface
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* @param[in] frequency : PWM signal frequency in Hz
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* @param[in] duty_cycle : PWM signal duty cycle in percentage point
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*
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* @return @ref OSStatus
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*/
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OSStatus platform_pwm_init( const platform_pwm_t* pwm, uint32_t frequency, float duty_cycle )
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{
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uint32_t total_count = 0;
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uint32_t duty_count = 0;
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hal_pwm_source_clock_t clk_src;
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if(frequency > 400000)
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{
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return kGeneralErr;
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}else if(frequency > 1000){
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clk_src = HAL_PWM_CLOCK_40MHZ;
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}else{
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clk_src = HAL_PWM_CLOCK_32KHZ;
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}
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hal_pwm_deinit();
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hal_gpio_init(HAL_GPIO_35);
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hal_pinmux_set_function(HAL_GPIO_35, HAL_GPIO_35_PWM18);
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/*Set source clock*/
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hal_pwm_init(clk_src);
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/*Set frequency*/
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hal_pwm_set_frequency(HAL_PWM_18, frequency, &total_count);
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/*Calculate and set the duty cycle*/
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duty_count = (uint32_t)((total_count * duty_cycle) / 100);
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hal_pwm_set_duty_cycle(HAL_PWM_18, duty_count);
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return kNoErr;
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}
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/**
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* Start generating PWM signal on the specified PWM interface
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*
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* @param[in] pwm_interface : PWM interface
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*
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* @return @ref OSStatus
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*/
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OSStatus platform_pwm_start( const platform_pwm_t* pwm )
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{
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hal_pwm_start(HAL_PWM_18);
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return kNoErr;
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}
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/**
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* Stop generating PWM signal on the specified PWM interface
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*
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* @param[in] pwm_interface : PWM interface
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*
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* @return @ref OSStatus
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*/
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OSStatus platform_pwm_stop( const platform_pwm_t* pwm )
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{
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hal_pwm_stop(HAL_PWM_18);
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return kNoErr;
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}
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