说明

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。 设置一个pwm波形，设置他的占空比和频率即可。

代码

/**

• @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)
复制代码

• 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
复制代码

• @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);

}

}