91 lines
3.4 KiB
C
91 lines
3.4 KiB
C
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#include "main.h"
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#include "stm32f4xx_adc.h"
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#include "stm32f4xx_dma.h"
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void Get_ADC_Optical(void);
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float Adjust_ADC(u32 adc_val);
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volatile u16 AD_Value[ADC_DMA_CHNNEL_SUM]; //用来存放ADC转换结果，也是DMA的目标地址
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/**
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* @brief adc dma 配置，无中断
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* @param
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* @retval None.
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*/
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void ADC_configuration(void)
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{
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DMA_InitTypeDef DMA_InitStructure;
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ADC_CommonInitTypeDef ADC_CommonInitStructure;
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ADC_InitTypeDef ADC_InitStructure;
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GPIO_InitTypeDef GPIO_InitStructure;
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 , ENABLE ); //使能ADC1通道时钟
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RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);//使能GPIOC时钟
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RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);//
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DMA_InitStructure.DMA_Channel = DMA_Channel_0;
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DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) & (ADC1->DR);
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DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&AD_Value;
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DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
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DMA_InitStructure.DMA_BufferSize = 1; //与通道数设置一致
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DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
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DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
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DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
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DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_HalfWord;
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DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
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DMA_InitStructure.DMA_Priority = DMA_Priority_High;
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DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; // DMA_FIFOMode_Disable DMA_FIFOMode_Enable
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DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
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DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
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DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
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DMA_Init(DMA2_Stream0, &DMA_InitStructure);
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DMA_Cmd(DMA2_Stream0, ENABLE);
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GPIO_StructInit(&GPIO_InitStructure);
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
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GPIO_Init(GPIOC, &GPIO_InitStructure);
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ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
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ADC_InitStructure.ADC_ScanConvMode = ENABLE;
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ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
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ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
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ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; // ADC_DataAlign_Right ADC_DataAlign_Left 设置数据右对齐
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ADC_InitStructure.ADC_NbrOfConversion = 1;
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ADC_Init(ADC1, &ADC_InitStructure);
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//设置通道顺序，里面的设置数与ADC_InitStructure.ADC_NbrOfConversion = 3;对应
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ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 1, ADC_SampleTime_112Cycles);
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// ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 2, ADC_SampleTime_112Cycles);
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// ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 3, ADC_SampleTime_112Cycles);
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ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
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ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div8;
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ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled; // ADC_DMAAccessMode_Disabled ADC_DMAAccessMode_1
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ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_20Cycles;
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ADC_CommonInit(&ADC_CommonInitStructure);
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ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE); //单通道使用
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ADC_Cmd(ADC1, ENABLE);
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ADC_DMACmd(ADC1, ENABLE);
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ADC_SoftwareStartConv(ADC1);
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}
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/**
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* @brief 计算电池电压值
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* @param
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* @retval None.
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*/
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float Adjust_ADC(u32 adc_val)
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{
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float Vout = 0.0;
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Vout = (STM32_ADC_REF / 0X0FFF) * adc_val;
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return Vout;
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}
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