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//下面是定時器TIM3_CH3的初始化，如果需要更換或添加TIM的其他通道，直接修改管腳和下面的注釋即可
void TIM3_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //使能 TIM3 時鐘
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //使能 GPIOB 時鐘
//TIM3_CH3-->PB0
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOB , &GPIO_InitStructure);
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 65535; //這里必須是65535
TIM_TimeBaseStructure.TIM_Prescaler = 71; //72（71+1）分頻，也就是1MHz（主頻72MHz）
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上計數模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //初始化TIM3
/* Output Compare Toggle Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle; //輸出比較翻轉模式，產生中斷后，輸出管腳電平翻轉，可設置成其他模式，百度一下就好
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //輸出為負邏輯
/*TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //使能通道1
TIM_OCInitStructure.TIM_Pulse = CCR1_Val; //待裝入輸出比較寄存器中的脈沖值，也就是計時器達到多少后產生中斷
TIM_OC1Init(TIM3, &TIM_OCInitStructure); //寫入配置
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Disable);*/ //使能或者失能TIMx在CCR1上的預裝載寄存器
/* Output Compare Toggle Mode configuration: Channel2 */
/*TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR2_Val;
TIM_OC2Init(TIM3, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Disable);*/
/* Output Compare Toggle Mode configuration: Channel3 */
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = PPM_IN[ppm_i];
TIM_OC3Init(TIM3, &TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Disable);
/* Output Compare Toggle Mode configuration: Channel4 */
/*TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = CCR4_Val;
TIM_OC4Init(TIM3, &TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Disable);*/
//中斷分組初始化
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //TIM3 中斷
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //先占優先級 2 級
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //從優先級 0 級
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ 通道被使能
NVIC_Init(&NVIC_InitStructure); //初始化外設 NVIC 寄存器
TIM_ITConfig(TIM3,TIM_IT_CC3,ENABLE);
/* TIM enable counter */
TIM_Cmd(TIM3, ENABLE); //開啟計數器
/* TIM IT enable */ //TIM1中斷源設置，開啟相應通道的捕捉比較中斷
//TIM_ITConfig(TIM3, TIM_IT_CC1 | TIM_IT_CC2 | TIM_IT_CC3 | TIM_IT_CC4, ENABLE);
//TIM_ITConfig(TIM3, TIM_IT_CC3, ENABLE);
}
//定時器 3 中斷服務程序
void TIM3_IRQHandler(void)
{
/*if (TIM_GetITStatus(TIM3, TIM_IT_CC3) != RESET) //檢查指定的TIM（3通道）中斷發生與否
{
TIM_ClearITPendingBit(TIM3, TIM_IT_CC3 ); //清除TIMx的中斷待處理位
capture = TIM_GetCapture3(TIM3); //獲得輸入捕獲值，即計數器中的計數值
TIM_SetCompare3(TIM3, capture + 500 ); //將計數值加上翻轉的脈沖值寫入輸出比較寄存器中，以保證下一個TIM事件，可以實現周期性產生中斷
}*/
if (TIM_GetITStatus(TIM3, TIM_IT_CC3) != RESET)//（tim3，3通道），這部分是我工程中用到的，也可以改成上面的內容，實現周期性中斷
{ //outdata();
TIM_ClearITPendingBit(TIM3, TIM_IT_CC3);
capture = TIM_GetCapture3(TIM3);
if(ppm_i==nPPM*2+1){
ppm_i=0;
}else{
ppm_i++;
}
TIM_SetCompare3(TIM3, capture + PPM_IN[ppm_i]);
}
}
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APP.zip
2019-12-13 15:38 上傳
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