stm32 hal库 adc定时器触发采样

您好！针对您的问题，可以通过以下步骤来实现STM32 HAL库ADC定时器触发采样：

1. 配置ADC时钟和DMA：

//开启ADC时钟
__HAL_RCC_ADC1_CLK_ENABLE();

//开启DMA时钟
__HAL_RCC_DMA2_CLK_ENABLE();

//配置DMA
hdma_adc.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_adc.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_adc.Init.MemInc = DMA_MINC_ENABLE;
hdma_adc.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_adc.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_adc.Init.Mode = DMA_CIRCULAR;
hdma_adc.Init.Priority = DMA_PRIORITY_HIGH;

//配置ADC
hadc1.Instance = ADC1;
hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
hadc1.Init.Resolution = ADC_RESOLUTION_12B;
hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE;
hadc1.Init.ContinuousConvMode = DISABLE;
hadc1.Init.DiscontinuousConvMode = DISABLE;
hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING;
hadc1.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T3_TRGO;
hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc1.Init.NbrOfConversion = 1;
hadc1.Init.DMAContinuousRequests = ENABLE;
hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;

//初始化ADC
HAL_ADC_Init(&hadc1);

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

2. 配置定时器：

//开启定时器时钟
__HAL_RCC_TIM3_CLK_ENABLE();

//配置定时器
htim3.Instance = TIM3;
htim3.Init.Prescaler = 999;
htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
htim3.Init.Period = 3999;
htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

//初始化定时器
HAL_TIM_Base_Init(&htim3);

//将定时器与ADC触发联系起来
sConfigOC.OCMode = TIM_OCMODE_TIMING;
sConfigOC.Pulse = 0;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
HAL_TIM_OC_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_1);
HAL_TIM_OC_Start(&htim3, TIM_CHANNEL_1);

3. 启动ADC和DMA：

//开启DMA
HAL_DMA_Start(&hdma_adc, (uint32_t)&ADC1->DR, (uint32_t)&adc_value, 1);

//开启ADC
HAL_ADC_Start_DMA(&hadc1, (uint32_t*)&adc_value, 1);

其中，`adc_value`是用于存储ADC采集结果的变量。

通过以上步骤，即可实现STM32 HAL库ADC定时器触发采样。