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之前用了一个64引脚封装的stm32做了一个ADC采集,后来发现没有提供参考电压,于是想用stm32的adc17通道采集stm32的内部1.2V的参照电压作为参考,对adc采样进行补偿。
- static void ADC1_GPIO_Config(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
-
- /* Enable DMA clock */
- RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
-
- /* Enable ADC1 and GPIOC clock */
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_GPIOC, ENABLE);
-
- /* Configure PC1 as analog input,voice */
- /* Configure PC0 as analog input,power */
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
- GPIO_Init(GPIOC, &GPIO_InitStructure);
- }
- void DMA_NVIC_Config(void)
- {
- NVIC_InitTypeDef NVIC_InitStructure;
-
- /* Configure one bit for preemption priority */
- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
- /* Enable DMA channel1 IRQ Channel */
- NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
- NVIC_Init(&NVIC_InitStructure);
- }
- static void ADC1_Mode_Config(void)
- {
- DMA_InitTypeDef DMA_InitStructure;
- ADC_InitTypeDef ADC_InitStructure;
-
- DMA_NVIC_Config();
- /* DMA channel1 configuration */
- DMA_DeInit(DMA1_Channel1);
- DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
- DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&g_VOCSample;
- DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
- DMA_InitStructure.DMA_BufferSize = VOC_SAMPLE_NUMBER;
- 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_Low;
- DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
- DMA_Init(DMA1_Channel1, &DMA_InitStructure);
-
- /* Enable DMA channel1 */
- DMA_Cmd(DMA1_Channel1, ENABLE);
- DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE); //DMA通道1传输完成中断
-
- /* ADC1 configuration */
- ADC_DeInit(ADC1);
- ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
- ADC_InitStructure.ADC_ScanConvMode = ENABLE;
- ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
- ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
- ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
- ADC_InitStructure.ADC_NbrOfChannel = 2;
- ADC_Init(ADC1, &ADC_InitStructure);
- ADC_TempSensorVrefintCmd(ENABLE);
-
- /* ADC1 regular channel11 configuration */
- ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 1, ADC_SampleTime_239Cycles5);
- ADC_RegularChannelConfig(ADC1, ADC_Channel_17, 2, ADC_SampleTime_239Cycles5);
- /* Enable ADC1 DMA */
- ADC_DMACmd(ADC1, ENABLE);
-
- /* Enable ADC1 */
- ADC_Cmd(ADC1, ENABLE);
-
- /* Enable ADC1 reset calibaration register */
- ADC_ResetCalibration(ADC1);
- /* Check the end of ADC1 reset calibration register */
- while(ADC_GetResetCalibrationStatus(ADC1));
-
- /* Start ADC1 calibaration */
- ADC_StartCalibration(ADC1);
- /* Check the end of ADC1 calibration */
- while(ADC_GetCalibrationStatus(ADC1));
-
- /* Start ADC1 Software Conversion */
- ADC_SoftwareStartConvCmd(ADC1, ENABLE);
- }
复制代码
整个代码如上,对ADC的GPIO,NVIC,DMA等都做了初始化设置,也使用了 ADC_TempSensorVrefintCmd(ENABLE) 语句打开stm32的内部参照电压。
但是我采样得到的内部参照电压数值为 1600 左右。而如果按照stm32数据手册所说,该1.2V参照电压的范围为 1.16~1.24V,那么采集出来的数值应该在 1440~1540 之内,不应该在 1600 左右。
请问,我的adc17通道采集的初始化正确吗?能不能用这种方法对外部adc采集进行一个补偿? |
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