郑州-杰瑞鼠 / STM32定时器的PWM输出配置(标准库）

void TIM3_PWMMode_Config(void)
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;

/* PWM信号电平跳变值 */
u16 CCR1_Val = 500; //占空比

/* -----------------------------------------------------------------------
TIM3 Configuration: generate 4 PWM signals with 4 different duty cycles:
TIM3CLK = 36 MHz, Prescaler = 0x0, TIM3 counter clock = 36 MHz
TIM3 ARR Register = 999 => TIM3 Frequency = TIM3 counter clock/(ARR + 1)
TIM3 Frequency = 36 KHz.
TIM3 Channel1 duty cycle = (TIM3_CCR1/ TIM3_ARR)* 100 = 50%
TIM3 Channel2 duty cycle = (TIM3_CCR2/ TIM3_ARR)* 100 = 37.5%
TIM3 Channel3 duty cycle = (TIM3_CCR3/ TIM3_ARR)* 100 = 25%
TIM3 Channel4 duty cycle = (TIM3_CCR4/ TIM3_ARR)* 100 = 12.5%
----------------------------------------------------------------------- */

/* Time base configuration */
//当定时器从0计数到999，即为1000次，为一个定时周期 （PWM的周期）
TIM_TimeBaseStructure.TIM_Period = 999;

//设置预分频：不预分频，即为36MHz
TIM_TimeBaseStructure.TIM_Prescaler = 0;

TIM_TimeBaseStructure.TIM_ClockDivision = 0;  //设置时钟分频系数：不分频 定时器PWM频率=36M/1000=36KHZ
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数模式

TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); /*定时器的周期*/

/* PWM1 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;   //配置为PWM模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

//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_Pulse = CCR1_Val;

//当定时器计数值小于CCR1_Val时为高电平
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

TIM_OC1Init(TIM3, &TIM_OCInitStructure);   //使能通道1
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable)//
TIM_ARRPreloadConfig(TIM3, ENABLE); /*自动重装载*/

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