STM32F4 TIM ADC DMA

// 1. 初始化TIM
TIM_HandleTypeDef htim2;
htim2.Instance = TIM2;
htim2.Init.Prescaler = 84 - 1;       // 84MHz / 84 = 1MHz
htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
htim2.Init.Period = 1000 - 1;        // 1MHz / 1000 = 1kHz触发频率
htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
HAL_TIM_Base_Init(&htim2);

// 配置TRGO触发信号
TIM_MasterConfigTypeDef sMasterConfig;
sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig);

// 2. 初始化ADC
ADC_HandleTypeDef hadc1;
hadc1.Instance = ADC1;
hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
hadc1.Init.Resolution = ADC_RESOLUTION_12B;
hadc1.Init.ScanConvMode = DISABLE;          // 单通道模式
hadc1.Init.ContinuousConvMode = ENABLE;     // 连续转换
hadc1.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T2_TRGO; // TIM2触发
HAL_ADC_Init(&hadc1);

// 配置ADC通道（例如通道0）
ADC_ChannelConfTypeDef sConfig;
sConfig.Channel = ADC_CHANNEL_0;
sConfig.Rank = 1;
sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
HAL_ADC_ConfigChannel(&hadc1, &sConfig);

// 3. 初始化DMA
DMA_HandleTypeDef hdma_adc;
hdma_adc.Instance = DMA2_Stream0;           // 根据ADC1选择对应DMA流
hdma_adc.Init.Channel = DMA_CHANNEL_0;      // 参见数据手册
hdma_adc.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_adc.Init.MemInc = DISABLE;             // 单通道地址不变
hdma_adc.Init.PeriphInc = DISABLE;
hdma_adc.Init.Mode = DMA_CIRCULAR;           // 循环模式
hdma_adc.Init.Priority = DMA_PRIORITY_HIGH;
hdma_adc.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
HAL_DMA_Init(&hdma_adc);

// 关联ADC和DMA
__HAL_LINKDMA(&hadc1, DMA_Handle, hdma_adc);

// 4. 启动传输
HAL_TIM_Base_Start(&htim2);                  // 启动TIM2
HAL_ADC_Start_DMA(&hadc1, (uint32_t*)adc_buffer, buffer_size); // 启动ADC+DMA

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