STM32F103单片机生成16路PWM波

单片机输出pwm波在项目中是恨常用的一个功能，今天就总结一下用STM32F103C8T6单片机输出16路 pwm波。

使用keil5软件，用标准库函数来实现。

首先看定时器初始化

void TIM1_PWM_Init(u16 arr, u16 psc)

{

    GPIO_InitTypeDef GPIO_InitStructure;

    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;

    TIM_OCInitTypeDef TIM_OCInitSturcture;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_TIM1, ENABLE);

    //初始化IO口

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(GPIOA, &GPIO_InitStructure);

    //设置 TIM ARR PSC

    TIM_TimeBaseInitStructure.TIM_Period = arr;

    TIM_TimeBaseInitStructure.TIM_Prescaler = psc;

    TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;

    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式

    TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0x00;

    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStructure);

    //TIM1_CH1  PWM1 模式

    TIM_OCInitSturcture.TIM_OCMode = TIM_OCMode_PWM1;

    TIM_OCInitSturcture.TIM_OutputState = TIM_OutputState_Enable;

    TIM_OCInitSturcture.TIM_OCPolarity = TIM_OCPolarity_High; //输出高电平有效

    TIM_OC1Init(TIM1, &TIM_OCInitSturcture);

    //TIM1_CH2  PWM1 模式

    TIM_OCInitSturcture.TIM_OCMode = TIM_OCMode_PWM1;

    TIM_OCInitSturcture.TIM_OutputState = TIM_OutputState_Enable;

    TIM_OCInitSturcture.TIM_OCPolarity = TIM_OCPolarity_High;  

    TIM_OC2Init(TIM1, &TIM_OCInitSturcture);

    //TIM1_CH3  PWM2 模式

    TIM_OCInitSturcture.TIM_OCMode = TIM_OCMode_PWM1;

    TIM_OCInitSturcture.TIM_OutputState = TIM_OutputState_Enable;

    TIM_OCInitSturcture.TIM_OCPolarity = TIM_OCPolarity_High;  

    TIM_OC3Init(TIM1, &TIM_OCInitSturcture);

    //TIM1_CH4  PWM2 模式

    TIM_OCInitSturcture.TIM_OCMode = TIM_OCMode_PWM1;

    TIM_OCInitSturcture.TIM_OutputState = TIM_OutputState_Enable;

    TIM_OCInitSturcture.TIM_OCPolarity = TIM_OCPolarity_High;

    TIM_OC4Init(TIM1, &TIM_OCInitSturcture);

    TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable); //TIM1_CH1 使能预装载寄存器

    TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable); //TIM1_CH2 使能预装载寄存器

    TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable); //TIM1_CH3 使能预装载寄存器

    TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable); //TIM1_CH4 使能预装载寄存器

    TIM_Cmd(TIM1, ENABLE); //使能计数器

    TIM_CtrlPWMOutputs(TIM1, ENABLE); //主输出使能

}

初始化定时1的4个通道，对应IO口为 PA8，PA9，PA10，PA11,将这4个口都设置为PWM输出口。入口参数arr用来设置定时器的自动重装载值，psc用于设置时钟分频系数。时钟默认为72MHZ。

下来初始化定时器2

void TIM2_PWM_Init(u16 arr, u16 psc)

{

    GPIO_InitTypeDef GPIO_InitStructure;

    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;

    TIM_OCInitTypeDef TIM_OCInitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);   //使能定时器2时钟

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);           //使能GPIO时钟

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(GPIOA, &GPIO_InitStructure);

    //初始化TIM2

    TIM_TimeBaseInitStructure.TIM_Period = arr;

    TIM_TimeBaseInitStructure.TIM_Prescaler = psc;

    TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;

    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;

    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStructure);

//初始化TIM2_CH1  PWM 模式

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

    TIM_OC1Init(TIM2, &TIM_OCInitStructure);

    //初始化TIM2_CH2  PWM 模式

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

    TIM_OC2Init(TIM2, &TIM_OCInitStructure);

    //初始化TIM2_CH3  PWM 模式

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

    TIM_OC3Init(TIM2, &TIM_OCInitStructure);

    //初始化TIM2_CH4  PWM 模式

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

    TIM_OC4Init(TIM2, &TIM_OCInitStructure);

    //使能TIM2在CCR上的预装载寄存器

TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);

    TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);

    TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable);

    TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Enable);

    //使能TIM2

    TIM_Cmd(TIM2, ENABLE);

}

这里要注意的是，定时器1是高级定时器，定时器2、3、4是通用定时器。只有高级定时器有重复计数寄存器，而通过定时器没有重复计数寄存器。定时器2初始化时，比定时器1少一行代码，这里要注意一下。

 TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0x00;

重复计数寄存器主要作用如下：

其余设置方法和定时器1基本一样，定时器2的4个通道对应的IO口为PA0，PA1，PA2，PA3.将这四个口设置为PWM输出模式。

入口参数arr用来设置定时器的自动重装载值，psc用于设置时钟分频系数。时钟默认为72MHZ。

下来设置定时器3

void TIM3_PWM_Init(u16 arr, u16 psc)

{

    GPIO_InitTypeDef GPIO_InitStructure;

    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;

    TIM_OCInitTypeDef TIM_OCInitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能定时器3时钟

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE); //使能GPIO时钟

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(GPIOB, &GPIO_InitStructure);

    //初始化TIM3

    TIM_TimeBaseInitStructure.TIM_Period = arr;

    TIM_TimeBaseInitStructure.TIM_Prescaler = psc;

    TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;

    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;

    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStructure);

    //初始化TIM3_CH1  PWM 模式

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

    TIM_OC1Init(TIM3, &TIM_OCInitStructure);

    //初始化TIM3_CH2  PWM 模式

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

    TIM_OC2Init(TIM3, &TIM_OCInitStructure);

    //初始化TIM3_CH3  PWM 模式

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

    TIM_OC3Init(TIM3, &TIM_OCInitStructure);

    //初始化TIM3_CH4  PWM 模式

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

    TIM_OC4Init(TIM3, &TIM_OCInitStructure);

    //使能TIM3在CCR上的预装载寄存器

    TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);

    TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);

    TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);

    TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);

    //使能TIM3

    TIM_Cmd(TIM3, ENABLE);

}

设置方法和定时器2一样，定时器3的4个通道对应的IO口为PA6，PA7，PB0，PB1。将这四个口设置为PWM输出模式。

入口参数arr用来设置定时器的自动重装载值，psc用于设置时钟分频系数。时钟默认为72MHZ。

最后设置定时器4

void TIM4_PWM_Init(u16 arr, u16 psc)

{

    GPIO_InitTypeDef GPIO_InitStructure;

    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;

    TIM_OCInitTypeDef TIM_OCInitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); //使能定时器4时钟

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB , ENABLE);           //使能GPIO时钟

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(GPIOB, &GPIO_InitStructure);

    //初始化TIM4

    TIM_TimeBaseInitStructure.TIM_Period = arr;

    TIM_TimeBaseInitStructure.TIM_Prescaler = psc;

    TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;

    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;

    TIM_TimeBaseInit(TIM4, &TIM_TimeBaseInitStructure);

//初始化TIM4_CH1  PWM 模式

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;