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
/* TIM1 counter enable开定时器 */
TIM_Cmd(TIM1,ENABLE);
/* TIM1 Main Output Enable 使能TIM1外设的主输出*/
TIM_CtrlPWMOutputs(TIM1,ENABLE);
}
//设置捕获寄存器1
void SetT1Pwm1(u16 pulse)
{
TIM1->CCR1=pulse;
}
/*操作寄存器改变占空时间*/
/*****************************************************************************************************************
TIM1的定时器通道时间 1到4 分别为 PB8 PA9 PA10 PA11 而互补输出分别为 PB13 PB14 PB15
中止 PB12 。