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下面是程序，请论坛大神指导一下。 static void ADC2_DMA_Config(void) { ADC_InitTypeDef ADC_InitStructure; ADC_CommonInitTypeDef ADC_CommonInitStructure; DMA_InitTypeDef DMA_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; /* Enable ADC3, DMA2 and GPIO clocks ****************************************/ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOA, ENABLE); //DMA2 GPIOA时钟使能 RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC2, ENABLE); //ADC2时钟使能 /* Configure ADC3 Channel13 pin as analog input ******************************/ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; //PA6 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; //模拟输入 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ; //无上下拉输出 GPIO_InitStructure.GPIO_Speed = GPIO_High_Speed ; GPIO_Init(GPIOA, &GPIO_InitStructure); DMA_DeInit(DMA2_Stream2); /* DMA2 Stream0 channel2 configuration **************************************/ DMA_InitStructure.DMA_Channel = DMA_Channel_2; //通道2 DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) &(ADC2->DR); //外设地址 DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t) &ADCoverVaule; //内存地址 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //DMA方向,外设到内存 DMA_InitStructure.DMA_BufferSize = 1; //数据量 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设不递增 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存递增 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //外设半字传输 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //内存半字接收 DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //循环模式 DMA_InitStructure.DMA_Priority = DMA_Priority_High; //高优先级 DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; //FIFO模式管 DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; //FIFO半工 DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //内存BURST单次 DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //外设BURST单次 DMA_Init(DMA2_Stream2, &DMA_InitStructure); //初始化DMA /* ADC Common Init **********************************************************/ ADC_DeInit(); //ADC复位 ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent; //独立模式 ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div6; //6分频 ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled; //DMA模式 ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles; //两次传送间隔5时钟周期 ADC_CommonInit(&ADC_CommonInitStructure); //ADC通用初始化 /* ADC2 Init ****************************************************************/ ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //精度12位 ADC_InitStructure.ADC_ScanConvMode = DISABLE; //扫描模式关闭 ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //连续模式关闭 ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising; //外设上升沿激活 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO; //T2 TRGO激活 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //右对齐 ADC_InitStructure.ADC_NbrOfConversion = 1; //1个通道 ADC_Init(ADC2, &ADC_InitStructure); //初始化ADC2 /* ADC3 regular channel13 configuration *************************************/ ADC_RegularChannelConfig(ADC2, ADC_Channel_6, 1, ADC_SampleTime_480Cycles); //ADC2通道6 规则排序1 /* Enable DMA request after last transfer (Single-ADC mode) */ /* Enable ADC3 DMA */ /* Enable ADC3 */ DMA_Cmd(DMA2_Stream2, ENABLE); //使能DMA ADC_DMARequestAfterLastTransferCmd(ADC2, ENABLE); //转换完毕DMA自动请求 ADC_Cmd(ADC2, ENABLE); //ADC使能 ADC_DMACmd(ADC2, ENABLE); //ADC-DMA使能 这行不使能时 ADC2->DR值是刷新的，使能后就失效了 ADC_SoftwareStartConv(ADC2); } void Tim2_Init_TRGO(u16 Period,u16 Prescaler) { TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE); TIM_TimeBaseInitStructure.TIM_ClockDivision=TIM_CKD_DIV1; TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Down; TIM_TimeBaseInitStructure.TIM_Period=Period; TIM_TimeBaseInitStructure.TIM_Prescaler=Prescaler; TIM_TimeBaseInit(TIM2,&TIM_TimeBaseInitStructure); TIM_SelectOutputTrigger(TIM2,TIM_TRGOSource_Update); TIM_Cmd(TIM2,ENABLE); } int main(void) { ADC2_DMA_Config(); Tim2_Init_TRGO(26250-1,0); while (1) { } } |
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这里是使用ADC时钟触发ADC
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO;
这里是使用TIM2时钟触发ADC
楼主你这样触发ADC能得到正确转换结果吗？
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软件触发那个是我拿来测试的。 单通道已经调好了，现在在写交替模式9通道如何处理。
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解决了，通道选错了。