ＳＴＭ３２的ＴＩＭ１＿ＣＨ１Ｎ反向引脚输出ＰＷＭ波．txt

PB14 PB15是STM32的TIM1的反向引脚


L11 H8 F2 35 53 75 PB14 I/O FT PB14 SPI2_MISO/TIM1_CH2N
USART3_RTS(8)/
L12 G8 F1 36 54 76 PB15 I/O FT PB15 SPI2_MOSI/I2S2_SD
TIM1_CH3N(8)/
可以输出PWM波
极性与TIM1_CH相反。

代码如下

/**
  ******************************************************************************
  * @file    motor.c
  * @author  STMicroelectronics
  * @version V1.0
  * @date    2016.2.2
  * @brief   聚焦电机控制
  ******************************************************************************
  * @attention
1000hz
20%占空比
  ******************************************************************************
  */
  
#include "IRFocusMotor.h" 
#include "gpio_array.h"
 /**
  * @brief  配置TIM2复用输出PWM时用到的I/O
  * @param  无
  * @retval 无
  */
  #define IRPWMPERIOD 1000 //此刻频率1k
  #define IRPWMDUTY 200 //此刻占空比80%
static void TIM1_GPIO_Config(void) 
{
  GPIO_InitTypeDef GPIO_InitStructure;


/* 设置TIM2 CLK 为 72MHZ */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE); 


  /* GPIOA clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO, ENABLE); 
//  GPIO_PinRemapConfig(GPIO_FullRemap_TIM3, ENABLE);//配置 PB5 为复用输出。


/*GPIOA Configuration: TIM2 channel 1 and 2 as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_14 | GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;    // 复用推挽输出
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOB, &GPIO_InitStructure);


}


/**
  * @brief  配置TIM3输出的PWM信号的模式，如周期、极性、占空比
  * @param  无
  * @retval 无
  */
/*
 * TIMxCLK/CK_PSC --> TIMxCNT --> TIMx_ARR --> TIMxCNT 重新计数
 *                    TIMx_CCR(电平发生变化)
 * 信号周期=(TIMx_ARR +1 ) * 时钟周期
 * 占空比=TIMx_CCR/(TIMx_ARR +1)
 */
static void TIM1_Mode_Config(void)
{


TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;


/* Time base configuration */ 
TIM_TimeBaseStructure.TIM_Period = IRPWMPERIOD;       //当定时器从0计数到999，即为1000次，为一个定时周期
TIM_TimeBaseStructure.TIM_Prescaler = 719;   //设置预分频：不预分频，即为72MHz
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ;//设置时钟分频系数：不分频(这里用不到)
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //向上计数模式
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);


/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;   //配置为PWM模式1
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = IRPWMDUTY;  //设置跳变值，当计数器计数到这个值时，电平发生跳变
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;  //当定时器计数值小于CCR1_Val时为高电平


TIM_OC3Init(TIM1, &TIM_OCInitStructure);//使能通道1
TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);


/* PWM1 Mode configuration: Channel2 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;   //配置为PWM模式1
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = IRPWMDUTY; //设置通道2的电平跳变值，输出另外一个占空比的PWM
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;  //当定时器计数值小于CCR1_Val时为高电平
TIM_OC2Init(TIM1, &TIM_OCInitStructure); //使能通道2
TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);


TIM_ARRPreloadConfig(TIM1, ENABLE);// 使能TIM3重载寄存器ARR
TIM_CtrlPWMOutputs(TIM1, ENABLE);


/* TIM3 enable counter */
TIM_Cmd(TIM1, ENABLE);                   //使能定时器3
}


/**
  * @brief  TIM3 输出PWM信号初始化，只要调用这个函数
  *         TIM3的四个通道就会有PWM信号输出
  * @param  无
  * @retval 无
  */
void TIM1_PWM_Init(void)
{
TIM1_GPIO_Config();
TIM1_Mode_Config();
}




void IRFocus_Ctrl(unsigned char state)
{


if(state)
{
TIM_CCxCmd(TIM1, TIM_Channel_3, DISABLE);
TIM_CCxCmd(TIM1, TIM_Channel_2, DISABLE);


TIM_SetCompare3(TIM1,IRPWMDUTY);
TIM_CCxCmd(TIM1, TIM_Channel_3, ENABLE);
}
else
{


TIM_CCxCmd(TIM1, TIM_Channel_3, DISABLE);
TIM_CCxCmd(TIM1, TIM_Channel_2, DISABLE);


TIM_SetCompare2(TIM1,IRPWMDUTY);
TIM_CCxCmd(TIM1, TIM_Channel_2, ENABLE);


}

}


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