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/**
******************************************************************************
* @file bsp_pwm_output.c
* @author STMicroelectronics
* @version V1.0
* @date 2013-xx-xx
* @brief tim3輸出四路pwm bsp
******************************************************************************
* @attention
******************************************************************************
*/
#include "bsp_pwm_output.h"
/**
* @brief 配置TIM3復(fù)用輸出PWM時(shí)用到的I/O
* @param 無(wú)
* @retval 無(wú)
*/
static void TIMx_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* 設(shè)置TIM3CLK 為 72MHZ */
// RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
macTIM_APBxClock_FUN (macTIM_CLK, ENABLE);
/* GPIOA and GPIOB clock enable */
macTIM_GPIO_APBxClock_FUN (macTIM_GPIO_CLK, ENABLE);
/*GPIOA Configuration: TIM3 channel 1 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = macTIM_CH1_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; // 復(fù)用推挽輸出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(macTIM_CH1_PORT, &GPIO_InitStructure);
/*GPIOB Configuration: TIM3 channel 2 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = macTIM_CH2_PIN;
GPIO_Init(macTIM_CH2_PORT, &GPIO_InitStructure);
/*GPIOB Configuration: TIM3 channel 3 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = macTIM_CH3_PIN;
GPIO_Init(macTIM_CH3_PORT, &GPIO_InitStructure);
/*GPIOB Configuration: TIM3 channel 4 as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = macTIM_CH4_PIN;
GPIO_Init(macTIM_CH4_PORT, &GPIO_InitStructure);
}
/**
* @brief 配置TIM3輸出的PWM信號(hào)的模式，如周期、極性、占空比
* @param 無(wú)
* @retval 無(wú)
*/
/*
* TIMxCLK/CK_PSC --> TIMxCNT --> TIMx_ARR --> TIMxCNT 重新計(jì)數(shù)
* TIMx_CCR(電平發(fā)生變化)
* 信號(hào)周期=(TIMx_ARR +1 ) * 時(shí)鐘周期
* 占空比=TIMx_CCR/(TIMx_ARR +1)
*/
static void TIMx_Mode_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/* PWM信號(hào)電平跳變值 */
u16 CCR1_Val = 160;
u16 CCR2_Val = 0;
u16 CCR3_Val = 0;
u16 CCR4_Val = 0;
/* -----------------------------------------------------------------------
macTIMx Channel1 duty cycle = (macTIMx_CCR1/ macTIMx_ARR+1)* 100% = 50%
macTIMx Channel2 duty cycle = (macTIMx_CCR2/ macTIMx_ARR+1)* 100% = 37.5%
macTIMx Channel3 duty cycle = (macTIMx_CCR3/ macTIMx_ARR+1)* 100% = 25%
macTIMx Channel4 duty cycle = (macTIMx_CCR4/ macTIMx_ARR+1)* 100% = 12.5%
----------------------------------------------------------------------- */
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 999; //當(dāng)定時(shí)器從0計(jì)數(shù)到999，即為1000次，為一個(gè)定時(shí)周期
TIM_TimeBaseStructure.TIM_Prescaler = 0; //設(shè)置預(yù)分頻：不預(yù)分頻，即為72MHz
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ; //設(shè)置時(shí)鐘分頻系數(shù)：不分頻(這里用不到)
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上計(jì)數(shù)模式
TIM_TimeBaseInit(macTIMx, &TIM_TimeBaseStructure);
/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //配置為PWM模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val; //設(shè)置跳變值，當(dāng)計(jì)數(shù)器計(jì)數(shù)到這個(gè)值時(shí)，電平發(fā)生跳變
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //當(dāng)定時(shí)器計(jì)數(shù)值小于CCR1_Val時(shí)為高電平
TIM_OC1Init(macTIMx, &TIM_OCInitStructure); //使能通道1
TIM_OC1PreloadConfig(macTIMx, TIM_OCPreload_Enable);
/* PWM1 Mode configuration: Channel2 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR2_Val; //設(shè)置通道2的電平跳變值，輸出另外一個(gè)占空比的PWM
TIM_OC2Init(macTIMx, &TIM_OCInitStructure); //使能通道2
TIM_OC2PreloadConfig(macTIMx, TIM_OCPreload_Enable);
/* PWM1 Mode configuration: Channel3 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR3_Val; //設(shè)置通道3的電平跳變值，輸出另外一個(gè)占空比的PWM
TIM_OC3Init(macTIMx, &TIM_OCInitStructure); //使能通道3
TIM_OC3PreloadConfig(macTIMx, TIM_OCPreload_Enable);
/* PWM1 Mode configuration: Channel4 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR4_Val; //設(shè)置通道4的電平跳變值，輸出另外一個(gè)占空比的PWM
TIM_OC4Init(macTIMx, &TIM_OCInitStructure); //使能通道4
TIM_OC4PreloadConfig(macTIMx, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(macTIMx, ENABLE); // 使能TIM3重載寄存器ARR
/* TIM3 enable counter */
TIM_Cmd(macTIMx, ENABLE); //使能定時(shí)器3
}
/**
* @brief TIM3 輸出PWM信號(hào)初始化，只要調(diào)用這個(gè)函數(shù)
* TIM3的四個(gè)通道就會(huì)有PWM信號(hào)輸出
* @param 無(wú)
* @retval 無(wú)
*/
void TIMx_PWM_Init(void)
{
TIMx_GPIO_Config();
TIMx_Mode_Config();
}
/*********************************************END OF FILE**********************/

復(fù)制代碼

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