5.STM32 TIM PWM 库函数 (基于正点原子STM32板)

TIM通用计时器介绍

TIM配置

void TIM_Config(uint16_t Channel2Pulse, uint16_t Channel3Pulse)
{
	TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
	TIM_OCInitTypeDef  TIM_OCInitStructure;
	
	/* TIM2 clock enable */
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);		
	
	/* Time base configuration */
	TIM_TimeBaseStructure.TIM_Period = a;  //设置自动重装载寄存器的值
	TIM_TimeBaseStructure.TIM_Prescaler = b; //设置时钟频率除数的预分频值
	TIM_TimeBaseStructure.TIM_ClockDivision = 0;
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
	//TIM2预分频设置:1MHZ,APB1分频系数2，输入到TIM3时钟为36MHzx2 = 72MHz  
	TIM_PrescalerConfig(TIM2,71, TIM_PSCReloadMode_Immediate);	

void NVIC_Configuration(void)
{
	NVIC_InitTypeDef NVIC_InitStructure;

	/* Enable the TIM2 global Interrupt */
	NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

	NVIC_Init(&NVIC_InitStructure);
}

注意：

1. 通用定时器是TIM2-5，基本定时器TIM6-7，高级定时器TIM1和TIM8。
2. TIM1和8在APB2，TIM2-7在APB1。
3. T(时间)=（（a+1）*(b+1)）/T(TIM时钟频率)

PWM

void TIM_Config(uint16_t Channel2Pulse, uint16_t Channel3Pulse)
{
	TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
	TIM_OCInitTypeDef  TIM_OCInitStructure;
	
	/* TIM2 clock enable */
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);		
	
	/* Time base configuration */
	TIM_TimeBaseStructure.TIM_Period = 999;  //1KHz
	TIM_TimeBaseStructure.TIM_Prescaler = 0;
	TIM_TimeBaseStructure.TIM_ClockDivision = 0;
	TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
	TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
	//TIM2预分频设置:1MHZ,APB1分频系数2，输入到TIM3时钟为36MHzx2 = 72MHz  
	TIM_PrescalerConfig(TIM2,71, TIM_PSCReloadMode_Immediate);		

	/* Channel 2 and 3 Configuration in PWM mode */
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
//	TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
	TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
//	TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
//	TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
//	TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;	
	
	TIM_OC2Init(TIM2, &TIM_OCInitStructure);

	TIM_OCInitStructure.TIM_Pulse = Channel3Pulse;
	TIM_OC3Init(TIM2, &TIM_OCInitStructure);

	//使能TIM2定时计数器
	TIM_Cmd(TIM2, ENABLE);
	//使能TIM2 PWM输出模式
	TIM_CtrlPWMOutputs(TIM2, ENABLE);
}


void PWM_IO_Config(void)
{
    GPIO_InitTypeDef  GPIO_InitStructure;
  
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
	
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
}