stm32定时器触发adc采样代码

以下是使用STM32定时器触发ADC采样的示例代码： ``` #include "stm32f4xx.h" #define ADC3_DR_ADDRESS ((uint32_t)0x4001224C) void ADC3_Config(void); void TIM2_Config(void); void GPIO_Config(void); int main(void) { GPIO_Config(); ADC3_Config(); TIM2_Config(); while (1) { // 采样完成后，ADC3_DR寄存器中存储采样值 uint16_t adc_value = *(uint16_t*)ADC3_DR_ADDRESS; } } void GPIO_Config(void) { GPIO_InitTypeDef GPIO_InitStruct; // 使能GPIOC时钟 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE); // 配置PC0为模拟输入 GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOC, &GPIO_InitStruct); } void ADC3_Config(void) { ADC_CommonInitTypeDef ADC_CommonInitStruct; ADC_InitTypeDef ADC_InitStruct; // 使能ADC3时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC3, ENABLE); // ADC3通用配置 ADC_CommonInitStruct.ADC_Mode = ADC_Mode_Independent; ADC_CommonInitStruct.ADC_Prescaler = ADC_Prescaler_Div2; ADC_CommonInitStruct.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled; ADC_CommonInitStruct.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles; ADC_CommonInit(&ADC_CommonInitStruct); // ADC3单独配置 ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b; ADC_InitStruct.ADC_ScanConvMode = DISABLE; ADC_InitStruct.ADC_ContinuousConvMode = DISABLE; ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising; ADC_InitStruct.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO; ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right; ADC_InitStruct.ADC_NbrOfConversion = 1; ADC_Init(ADC3, &ADC_InitStruct); // 配置ADC3通道10为采样通道 ADC_RegularChannelConfig(ADC3, ADC_Channel_10, 1, ADC_SampleTime_480Cycles); // 使能ADC3 ADC_Cmd(ADC3, ENABLE); // 等待ADC3启动 while (!ADC_GetFlagStatus(ADC3, ADC_FLAG_ADONS)); } void TIM2_Config(void) { TIM_TimeBaseInitTypeDef TIM_InitStruct; // 使能TIM2和GPIOA时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); // TIM2配置 TIM_InitStruct.TIM_Prescaler = 84 - 1; // 定时器时钟频率为84MHz/84=1MHz TIM_InitStruct.TIM_CounterMode = TIM_CounterMode_Up; TIM_InitStruct.TIM_Period = 1000 - 1; // 计数器计数到1000时触发ADC采样 TIM_InitStruct.TIM_ClockDivision = TIM_CKD_DIV1; TIM_TimeBaseInit(TIM2, &TIM_InitStruct); // 启用TIM2触发ADC3采样 TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update); ADC_ExternalTrigConvCmd(ADC3, ENABLE); // 启动TIM2 TIM_Cmd(TIM2, ENABLE); } ``` 此代码初始化了ADC3、TIM2和GPIOC，将PC0配置为模拟输入，并使用TIM2触发ADC3采样。计时器时钟频率为1MHz，计数器计数到1000时触发一次ADC采样。采样完成后，采样值存储在ADC3_DR寄存器中。