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TIM4配置程序如下
void TIM4_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); //使能定時(shí)器3時(shí)鐘
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外設(shè)和AFIO復(fù)用功能模塊時(shí)鐘
// GPIO_PinRemapConfig(GPIO_Remap_TIM4, ENABLE); //Timer4完全重映射
/* 不重映射，RCT6沒有GPIOD以上引腳 由單片機(jī)引腳而設(shè)定 */
//設(shè)置該引腳為復(fù)用輸出功能,輸出TIM4 CH3的PWM脈沖波形 GPIOB.8
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //TIM_CH3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復(fù)用推挽輸出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIO
/*****TIME4定時(shí)器中斷*******/
TIM_ITConfig(TIM4,TIM_IT_Update,ENABLE ); //使能指定的TIM4中斷,允許更新中斷
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn; //TIM3中斷
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //先占優(yōu)先級0級
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //從優(yōu)先級3級
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure); //初始化NVIC寄存器
//初始化TIM4
TIM_TimeBaseStructure.TIM_Period = arr; //設(shè)置在下一個(gè)更新事件裝入活動的自動重裝載寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler =psc; //設(shè)置用來作為TIMx時(shí)鐘頻率除數(shù)的預(yù)分頻值
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //設(shè)置時(shí)鐘分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計(jì)數(shù)模式
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure); //根據(jù)TIM_TimeBaseInitStruct中指定的參數(shù)初始化TIMx的時(shí)間基數(shù)單位
//初始化TIM4 Channel2M?PWＪ?
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //選擇定時(shí)器模式:TIM脈沖寬度調(diào)制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比較輸出使能
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //輸出極性:TIM輸出比較極性low
TIM_OC3Init(TIM4, &TIM_OCInitStructure); //根據(jù)T指定的參數(shù)初始化外設(shè)TIM4 OC2
TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable); //使能TIM4在CCR2上的預(yù)裝載寄存器
TIM_Cmd(TIM4, ENABLE); //使能TIM3
}
/*定時(shí)器4中斷服務(wù)程序*/
void TIM4_IRQHandler(void) //TIM3中斷
{
static int i=0;
if (TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET) //檢查指定的TIM中斷發(fā)生與否:TIM 中斷源
{
TIM_ClearITPendingBit(TIM4, TIM_IT_Update ); //清除TIMx的中斷待處理位:TIM 中斷源
i++;
// if(i==1200)
// {
// i=0;
// TIM_Cmd(TIM4, DISABLE);
// }
}
}
主程序如下 ：
int main(void)
{
// Init_12864();
Motor_Init();
// LCD_P6x8Str(2,0,"BMP180:");
TIM4_PWM_Init(100,0);
while(1)
{
TIM_SetCompare3(TIM4,50);
}
}
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