STM32高级定时器PWM实用程序

只看该作者 · 2015-3-27 00:37

该**讲述了STM32高级定时器PWM实用程序.

高级定时器与通用定时器比较类似，下面是一个TIM1 的PWM 程序,TIM1是STM32唯一的高级定时器。共有4个通道有死区有互补。

先是配置IO脚：

GPIO_InitTypeDef GPIO_InitStructure;

/* PA8设置为功能脚(PWM) */

GPIO_InitStructure.GPIO_Pin =GPIO_Pin_8;

GPIO_InitStructure.GPIO_Mode =GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Speed =GPIO_Speed_50MHz;

GPIO_Init(GPIOA,&GPIO_InitStructure);

/*PB13 设置为PWM的反极性输出*/

GPIO_InitStructure.GPIO_Pin =GPIO_Pin_13;

GPIO_InitStructure.GPIO_Mode =GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Speed =GPIO_Speed_50MHz;

GPIO_Init(GPIOB,&GPIO_InitStructure);

/*开时钟PWM的与GPIO的*/

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

/*配置TIM1*/

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

TIM_OCInitTypeDef TIM_OCInitStructure;

void Tim1_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;

TIM_DeInit(TIM1); //重设为缺省值

/*TIM1时钟配置*/
TIM_TimeBaseStructure.TIM_Prescaler =4000;    //预分频(时钟分频)72M/4000=18K
TIM_TimeBaseStructure.TIM_CounterMode =TIM_CounterMode_Up;  //向上计数
TIM_TimeBaseStructure.TIM_Period = 144;    //装载值 18k/144=125hz 就是说向上加的144便满了
TIM_TimeBaseStructure.TIM_ClockDivision =TIM_CKD_DIV1; //设置了时钟分割不懂得不管
TIM_TimeBaseStructure.TIM_RepetitionCounter =0x0; //周期计数器值  不懂得不管
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure); //初始化TIMx的时间基数单位

/* Channel 1 Configuration in PWM mode 通道一的PWM */
TIM_OCInitStructure.TIM_OCMode =TIM_OCMode_PWM2;    //PWM模式2
TIM_OCInitStructure.TIM_OutputState =TIM_OutputState_Enable;  //正向通道有效  PA8
TIM_OCInitStructure.TIM_OutputNState =TIM_OutputNState_Enable; //反向通道也有效 PB13
TIM_OCInitStructure.TIM_Pulse = 40;       //占空时间  144 中有40的时间为高，互补的输出正好相反
TIM_OCInitStructure.TIM_OCPolarity =TIM_OCPolarity_Low; //输出极性
TIM_OCInitStructure.TIM_OCNPolarity =TIM_OCNPolarity_Low;    //互补端的极性
TIM_OCInitStructure.TIM_OCIdleState =TIM_OCIdleState_Reset;  //空闲状态下的非工作状态不管
TIM_OCInitStructure.TIM_OCNIdleState =TIM_OCIdleState_Reset;  //先不管

TIM_OC1Init(TIM1,&TIM_OCInitStructure); //数初始化外设TIMx通道1这里2.0库为TIM_OCInit