ADC1的触发事件TIM3 TRGO

laozg · 发表于 2011-7-20 23:23:42

请教！
ADC1,ADC2可以由TIM3 的TRGO 事件触发，TIM3的TRGO事件是怎么样一个事件,CCx的事件就是比较匹配时触发ADC，ADC可不可以设置成PWM同步，当PWM发出同步信号后，定时器延时一段时间再进行ADC采样，这样ADC可以配合PWM对特定的时刻进行采样，为了使电流稳定后得到准确的电流采样。因为当开关管子导通时，电流还没有稳定，在电流稳定达到平均电流的时刻进行采样。想用TIM3 的CCX事件，但是都已经用来产生四路PWM了，想用TRGO，不知道TRGO是什么事情，在文档里面再没有找到TRGO这个符号！DSP里PWM有这样的功能！

lansing1648 · 发表于 2013-9-11 16:16:36

void myADC_Init()
{
                 ADC_InitTypeDef ADC_InitStruct;
                 GPIO_InitTypeDef GPIO_InitStruct;
                 RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 ,ENABLE);
                 RCC_ADCCLKConfig(RCC_PCLK2_Div6);

                //ADC1_Init
                 GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_0;
                 GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AIN;
                 GPIO_Init(GPIOA,&GPIO_InitStruct);

                ADC_DeInit(ADC1);
                 ADC_InitStruct.ADC_Mode = ADC_Mode_Independent;
                 ADC_InitStruct.ADC_NbrOfChannel = 1;
                 ADC_InitStruct.ADC_ContinuousConvMode = DISABLE;
                 ADC_InitStruct.ADC_ScanConvMode = DISABLE;
                 ADC_InitStruct.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T3_TRGO;
                 ADC_InitStruct.ADC_DataAlign =ADC_DataAlign_Right;
                 ADC_Init(ADC1,&ADC_InitStruct);

                ADC_ExternalTrigConvCmd(ADC1,ENABLE);
                 //ENABLE ADC1
                 ADC_RegularChannelConfig(ADC1,0,1,ADC_SampleTime_1Cycles5);

                ADC_DMACmd(ADC1,ENABLE);
                 ADC_Cmd(ADC1,ENABLE);

                ADC_ResetCalibration(ADC1);
                 while(ADC_GetResetCalibrationStatus(ADC1));
                 ADC_StartCalibration(ADC1);
                 while(ADC_GetCalibrationStatus(ADC1));

}

void TIM3_Init()
{
                 TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
                 NVIC_InitTypeDef NVIC_InitStruct;

                RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);

                TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
                 TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
                 TIM_TimeBaseInitStruct.TIM_Period = 72000000/SampleRate;
                 TIM_TimeBaseInitStruct.TIM_Prescaler = 0;
                 TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStruct);

                TIM_SelectOutputTrigger(TIM3,TIM_TRGOSource_Update); //选择TRGO触发源为计时器更新时间

                TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);
                 NVIC_InitStruct.NVIC_IRQChannel = TIM3_IRQn;
                 NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
                 NVIC_InitStruct.NVIC_IRQChannelSubPriority = 3;
                 NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
                 NVIC_Init(&NVIC_InitStruct);
                 TIM_Cmd(TIM3,ENABLE);

}