stm32_pwm.rar_stm32 pwm_stm32 pwm 脉冲_stm32 pwm输出_ucos-ii

#include "bsp_pwm.h" #include "stdio.h" static void PWM_GPIO_Init(void); //声明PWM时所用管脚的初始化函数 void PWM_Init() { PWM_GPIO_Init(); //调用PWM时所用管脚的初始化函数 } static void PWM_GPIO_Init(void) //pwm时管脚的配置 { GPIO_InitTypeDef pwm1GPIO, pwm2GPIO; //定义结构体变量 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); //使能GPIOB时钟,同时GPIOB也是 //被重映射到的I/O端口的时钟,同时使能AFIO功能的时钟 GPIO_PinRemapConfig(GPIO_FullRemap_TIM2, ENABLE); //开启TIM2_CH4引脚映射 pwm1GPIO.GPIO_Pin = GPIO_Pin_11; pwm1GPIO.GPIO_Speed = GPIO_Speed_10MHz; pwm1GPIO.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出功能 GPIO_Init(GPIOB, &pwm1GPIO); pwm2GPIO.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_9; pwm2GPIO.GPIO_Speed = GPIO_Speed_2MHz; pwm2GPIO.GPIO_Mode = GPIO_Mode_AF_PP;//GPIO_Mode_Out_PP; //推挽输出功能 GPIO_Init(GPIOB, &pwm2GPIO); } uint8_t Config_PWM(TIM_TypeDef* TIMx, uint8_t channel, uint32_t freq, uint32_t duty) //PWM的配置 { TIM_TimeBaseInitTypeDef timBaseInit; //定义与PWM相关定时器参数的结构体变量 TIM_OCInitTypeDef timOCInit; //定义与PWM输出相关寄存器参数的结构体变量 RCC_ClocksTypeDef clkInfo; //定义与PWM输出相关时钟参数的结构体变量 //if(freq > 72000) //输入频率参数>72000,参数非法，返回 //return 1; //if(pulse > 100) //输入占空比>100,参数非法，返回 //return 2; if((0 == freq) || (0 == duty)) //频率 or 占空比为0，停止PWM { TIM_Cmd(TIMx, DISABLE); //由外部输入 } RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //开启TIMx时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); RCC_GetClocksFreq(&clkInfo); //获取当前各时钟信息 //初始化TIMx if(freq > 500) { timBaseInit.TIM_Prescaler = 60 - 1; //预分频位100 //频率大于500赫兹 timBaseInit.TIM_Period = clkInfo.PCLK1_Frequency / (timBaseInit.TIM_Prescaler + 1) / freq; } else { timBaseInit.TIM_Prescaler = 6000 - 1; //频率小于500赫兹,用于警报,采用下面公式 timBaseInit.TIM_Period = clkInfo.PCLK1_Frequency*10 / (timBaseInit.TIM_Prescaler + 1) / freq; } //timBaseInit.TIM_Period = clkInfo.PCLK1_Frequency / (timBaseInit.TIM_Prescaler + 1) / freq; //???? timBaseInit.TIM_ClockDivision = TIM_CKD_DIV4; //设置时钟分割 timBaseInit.TIM_CounterMode = TIM_CounterMode_Down; //向下计数 TIM_TimeBaseInit(TIMx, &timBaseInit); //初始化TIMx Channelx PWM模式 timOCInit.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2 //timOCInit.TIM_Pulse = duty; //设置占空比,由外部输入 公式为(TIM_Pulse/TIM_Period)*100% timOCInit.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高 timOCInit.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能 //是能不同通道的PWM switch(channel) //选择通道,由外部输入 { case 1: TIM_OC1Init(TIMx, &timOCInit); TIM_OC1PreloadConfig(TIMx, TIM_OCPreload_Enable); break; case 2: TIM_OC2Init(TIMx, &timOCInit); TIM_OC2PreloadConfig(TIMx, TIM_OCPreload_Enable); //printf("timx = %d\n",channel); break; case 3: TIM_OC3Init(TIMx, &timOCInit); TIM_OC3PreloadConfig(TIMx, TIM_OCPreload_Enable); break; case 4: TIM_OC4Init(TIMx, &timOCInit); TIM_OC4PreloadConfig(TIMx, TIM_OCPreload_Enable); //printf("timx = %d\n",channel); break; } //使能TIMx TIM_Cmd(TIMx, ENABLE); //设置不同通道的占空比 switch(channel) { case 1: TIM_SetCompare1(TIMx, timBaseInit.TIM_Period * (100 - duty) / 100); break; case 2: TIM_SetCompare2(TIMx, timBaseInit.TIM_Period * (100 - duty) / 100); break; case 3: TIM_SetCompare3(TIMx, timBaseInit.TIM_Period * (100 - duty) / 100); break; case 4: TIM_SetCompare4(TIMx, timBaseInit.TIM_Period * (100 - duty) / 100); break; } return 0; }