STM32双重ADC快速交叉模式采集一个规则组通道数据,采用定时器触发主ADC,库函数编写
时间: 2023-06-13 15:05:22 浏览: 95
以下是使用STM32库函数编写双重ADC快速交叉模式采集规则组通道数据的步骤:
1. 配置ADC时钟和引脚
首先需要配置ADC的时钟和引脚,包括ADC的时钟使能、GPIO引脚的配置以及ADC的基本配置。
这里假设使用的是ADC1和ADC2,它们的时钟都已经使能,引脚PA0和PA1分别连接到了ADC1的通道0和ADC2的通道0,同时使用了TIM1作为触发源。
```
GPIO_InitTypeDef GPIO_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
// 使能GPIO时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
// 配置PA0和PA1为模拟输入
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// 配置ADC1和ADC2
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 1;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_Init(ADC2, &ADC_InitStructure);
// 配置TIM1作为触发源
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_SelectOutputTrigger(TIM1, TIM_TRGOSource_OC1);
```
2. 配置ADC多重转换模式
接下来需要配置ADC的多重转换模式,使其能够交替地进行转换。在这种模式下,每次转换时会自动切换到另一个ADC,并且可以设置转换的通道和转换次数。
这里假设要采集的通道是PA0和PA1,转换次数为1次。
```
ADC_CommonInitTypeDef ADC_CommonInitStructure;
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(ADC_CommonInitStructure);
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_3Cycles);
ADC_RegularChannelConfig(ADC2, ADC_Channel_0, 1, ADC_SampleTime_3Cycles);
ADC_MultiModeDMARequestAfterLastTransferCmd(ENABLE);
ADC_MultiModeDMARequestAfterLastTransferCmd(ENABLE);
ADC_MultiModeDualRegularConvCmd(ENABLE);
```
3. 配置DMA传输和中断
最后需要配置DMA传输和中断,使得转换结果能够自动传输到指定的缓冲区,并且可以在转换完成后触发中断。
这里假设使用DMA1的通道1和通道2,传输的缓冲区是buffer数组。
```
DMA_InitTypeDef DMA_InitStructure;
// 使能DMA时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
// 配置DMA传输
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)buffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = 2;
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_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA2_Stream0, &DMA_InitStructure);
DMA_InitStructure.DMA_Channel = DMA_Channel_1;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC2->DR;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)(buffer+1);
DMA_Init(DMA2_Stream2, &DMA_InitStructure);
// 配置DMA中断
NVIC_InitTypeDef NVIC_InitStructure;
DMA_ITConfig(DMA2_Stream0, DMA_IT_TC, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
DMA_ITConfig(DMA2_Stream2, DMA_IT_TC, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream2_IRQn;
NVIC_Init(&NVIC_InitStructure);
// 启动DMA传输
DMA_Cmd(DMA2_Stream0, ENABLE);
DMA_Cmd(DMA2_Stream2, ENABLE);
// 启动ADC转换
ADC_Cmd(ADC1, ENABLE);
ADC_Cmd(ADC2, ENABLE);
ADC_SoftwareStartConv(ADC1);
```
至此,双重ADC快速交叉模式采集一个规则组通道数据的代码已经编写完毕。在实际使用中,可以通过修改ADC的配置参数和DMA的传输参数来适配不同的应用场景。
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