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这功能网上没多少关于F407的，看了几个例程都没成功。
现在问题是复位后只触发了一次转换，仅使用DMA+ADC+软件触发是没问题的，问题就在定时器上
- void ADC_TIM2_Configuration(u16 arr)
- {
- TIM_TimeBaseInitTypeDef TIM_initstructure;//定时器时基配置结构体变量
- TIM_OCInitTypeDef TIM_OCinitstructure;
-
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);//设置定时器TIM2时钟 使能外设时钟
-
- TIM_DeInit(TIM2);//先设置缺省
-
- TIM_initstructure.TIM_Period = arr;//计时周期
- TIM_initstructure.TIM_Prescaler = 83;//预分频
- TIM_initstructure.TIM_ClockDivision = TIM_CKD_DIV1; //时钟频率不分割
- TIM_initstructure.TIM_CounterMode = TIM_CounterMode_Up;//向上计数模式
- TIM_TimeBaseInit(TIM2,&TIM_initstructure);
- TIM_OCinitstructure.TIM_OCMode = TIM_OCMode_PWM1;//使用PWM1模式
- TIM_OCinitstructure.TIM_OutputState = TIM_OutputState_Enable;//使能输出比较模式
- TIM_OCinitstructure.TIM_OCPolarity = TIM_OCPolarity_Low ;
- TIM_OCinitstructure.TIM_Pulse = arr / 2;//初始比较寄存器的值
- TIM_OC2Init(TIM2,&TIM_OCinitstructure);
- TIM_CtrlPWMOutputs(TIM2, ENABLE);
-
- TIM_ARRPreloadConfig(TIM2, ENABLE); //允许TIM2定时重载
- TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_OC2Ref);
- }
- void ADC_DMA_Configuration()
- {
- DMA_InitTypeDef DMA_InitStructure;
-
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE); //ADC1使用DMA2控制器
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- DMA_InitStructure.DMA_Channel = DMA_Channel_0; //ADC1在通道0
- DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)ADC1_DR_ADDR;
- DMA_InitStructure.DMA_Memory0BaseAddr = (u32)adc_dat;
- DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
- DMA_InitStructure.DMA_BufferSize = N;
- DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
- DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
- DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
- DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
- DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
- DMA_InitStructure.DMA_Priority = DMA_Priority_High;
- DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; //关闭FIFO模式
- DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; //FIFO阈值
- DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //内存突发,单次传输
- DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //外设突发,单次传输
- DMA_Init(DMA2_Stream0, &DMA_InitStructure); //F407的ADC1在通道0上有两个数据流，这里选择数据流0
- /*dma中断配置*/
- DMA_ITConfig(DMA2_Stream0, DMA_IT_TC, ENABLE);
- DMA_ClearITPendingBit(DMA2_Stream0, DMA_IT_TCIF0);
- DMA_ClearFlag(DMA2_Stream0, DMA_FLAG_TCIF0);
- DMA_Cmd(DMA2_Stream0, ENABLE);//使能dma2通道0的数据流0
- }
- void ADC_Configuration(u16 sample_period)
- {
- ADC_InitTypeDef ADC_initstructure;
- ADC_CommonInitTypeDef ADC_CommonInitStructure;
- GPIO_InitTypeDef GPIO_InitStructure;
-
- ADC_TIM2_Configuration(sample_period);
- ADC_DMA_Configuration();
- /* ***************************** */
-
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
-
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模拟输入
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
- GPIO_Init(GPIOC, &GPIO_InitStructure);
-
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);//打开ADC1时钟
-
- ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;//此处只用到一个ADC
- ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles; //单ADC下随便设置
- ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled; //不使用DMA
- ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4; //ADC时钟分频
- ADC_CommonInit(&ADC_CommonInitStructure);
- ADC_initstructure.ADC_Resolution = ADC_Resolution_12b; //使用12为分辨率
- ADC_initstructure.ADC_ScanConvMode = DISABLE;
- ADC_initstructure.ADC_ContinuousConvMode = DISABLE;
- ADC_initstructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_CC2; //使用外部触发，使用定时器2的捕获比较通道2来触发
- ADC_initstructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;//使用上升沿触发
- ADC_initstructure.ADC_DataAlign = ADC_DataAlign_Right;//数据右对齐
- ADC_initstructure.ADC_NbrOfConversion = 1;//通道个数1
- ADC_Init(ADC1,&ADC_initstructure);//初始化ADC1
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- ADC_RegularChannelConfig(ADC1,ADC_Channel_11,1,ADC_SampleTime_84Cycles);
- /*使用ADC触发DMA来传输*/
- ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
-
- ADC_DMACmd(ADC1,ENABLE);//使能ADC1的DMA传输
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- ADC_Cmd(ADC1,ENABLE);//使能ADC1外设
-
- TIM_Cmd(TIM2,ENABLE);//使能定时器2
- }
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发表于 2019-7-23 21:39:54
发表于 2019-7-24 00:03:05
楼主
，能连续转换才奇怪了
