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); //使能定時器3時鐘
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外設和AFIO復用功能模塊時鐘
// GPIO_PinRemapConfig(GPIO_Remap_TIM4, ENABLE); //Timer4完全重映射
/* 不重映射，RCT6沒有GPIOD以上引腳 由單片機引腳而設定 */
//設置該引腳為復用輸出功能,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; //復用推挽輸出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化GPIO
/*****TIME4定時器中斷*******/
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; //先占優先級0級
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //從優先級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; //設置在下一個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; //設置用來作為TIMx時鐘頻率除數的預分頻值
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //設置時鐘分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計數模式
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure); //根據TIM_TimeBaseInitStruct中指定的參數初始化TIMx的時間基數單位
//初始化TIM4 Channel2M?PWＪ?
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //選擇定時器模式:TIM脈沖寬度調制模式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T指定的參數初始化外設TIM4 OC2
TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable); //使能TIM4在CCR2上的預裝載寄存器
TIM_Cmd(TIM4, ENABLE); //使能TIM3
}
/*定時器4中斷服務程序*/
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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