STM32-高級定時器TIM1的應(yīng)用

void GPIO_Configuration(void)//配置IO腳

{

GPIO_InitTypeDef GPIO_InitStructure;

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);

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);

}

void TIM1_Configuration(void)

{

RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

TIM_OCInitTypeDef TIM_OCInitStructure;

TIM_DeInit(TIM1); //重設(shè)為缺省值

TIM_TimeBaseStructure.TIM_Prescaler = 4000; //預(yù)分頻(時鐘分頻)72M/4000=18K

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上計數(shù)

TIM_TimeBaseStructure.TIM_Period = 144; //裝載值 18k/144=125hz 就是說向上加的144便滿了

TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //設(shè)置了時鐘分割 不懂得不管

TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0; //周期計數(shù)器值 不懂得不管

TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure); //初始化TIMx的時間基數(shù)單位

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; //占空時間 144 中有40的時間為高，互補的輸出正好相反

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //輸出極性

TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; //互補端的極性

TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset; //空閑狀態(tài)下的非工作狀態(tài) 不管

TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset; //先不管

TIM_OC1Init(TIM1,&TIM_OCInitStructure); //數(shù)初始化外設(shè)TIMx通道1這里2.0庫為TIM_OCInit

TIM_Cmd(TIM1,ENABLE);

TIM_CtrlPWMOutputs(TIM1,ENABLE);

}

void SetT1Pwm1(u16 pulse)//設(shè)置捕獲寄存器1

{

TIM1->CCR1=pulse;

}

/*TIM1的定時器通道時間 1到4 分別為 PB8 PA9 PA10 PA11 而互補輸出分別為 PB13 、PB14 、PB15、 PB12

如果輸出與互補輸出極性相同的話 就剛好輸出高 互補低 至于PWM模式1 與模式2的區(qū)別。如下圖模式一：

模式2與模式1互補，144中有40 為高 互補的有40為低。