STM32——高级定时器的应用

/定时器1的配置 输出两路PWM信号 PA8 PA11,计数时钟为400KHZ 计数溢出大小为40000 /

void Tim1Init(void)

{

GPIO_InitTypeDef GPIO_InitStruct;

TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;

TIM_OCInitTypeDef TIM_OCInitStruct;

u16 LeftMotor_CCR;

u16 RightMotor_CCR;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1|RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE);

GPIO_InitStruct.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_11 ; // 定时器1 通道1和4

GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStruct);

LeftMotor_CCR = RightMotor_CCR = 2000;

//在APB2设置为72MHZ的基础上，对定时器1进行配置

TIM_TimeBaseInitStruct.TIM_RepetitionCounter = 0; // 重复计数器无效 */

TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up; // 向上计数 */

TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1; // 时钟分频 */

TIM_TimeBaseInitStruct.TIM_Prescaler = 180-1; // 预分频系数为180-1，计数器时钟为72MHz/180 = 400KHz */

TIM_TimeBaseInitStruct.TIM_Period = 40000-1;

TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStruct);

TIM_OCInitStruct.TIM_OutputNState = TIM_OutputNState_Disable;

TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM2;

TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;

TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_Low;

TIM_OCInitStruct.TIM_Pulse = LeftMotor_CCR;

TIM_OC1Init(TIM1, &TIM_OCInitStruct);

TIM_OCInitStruct.TIM_Pulse = RightMotor_CCR;

TIM_OC4Init(TIM1, &TIM_OCInitStruct);

TIM_Cmd(TIM1, ENABLE);

TIM_CtrlPWMOutputs(TIM1, ENABLE);

}