90 lines
2.8 KiB
C
90 lines
2.8 KiB
C
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#include "adc.h"
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static vu8 g_Adc_Inited=0;
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//初始化ADC
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void Adc_Init(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure={0};
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ADC_CommonInitTypeDef ADC_CommonInitStructure={0};
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ADC_InitTypeDef ADC_InitStructure={0};
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Adc_DeInit();
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RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//使能GPIOA时钟
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //使能ADC1时钟
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//先初始化ADC1通道5 IO口
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;//PA5 通道5
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;//模拟输入
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;//不带上下拉
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GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化
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RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,ENABLE); //ADC1复位
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RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,DISABLE); //复位结束
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ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;//独立模式
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ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;//两个采样阶段之间的延迟5个时钟
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ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled; //DMA失能
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ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;//预分频4分频。ADCCLK=PCLK2/4=84/4=21Mhz,ADC时钟最好不要超过36Mhz
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ADC_CommonInit(&ADC_CommonInitStructure);//初始化
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ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;//12位模式
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ADC_InitStructure.ADC_ScanConvMode = DISABLE;//非扫描模式
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ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;//关闭连续转换
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ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;//禁止触发检测，使用软件触发
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ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//右对齐
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ADC_InitStructure.ADC_NbrOfConversion = 1;//1个转换在规则序列中 也就是只转换规则序列1
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ADC_Init(ADC1, &ADC_InitStructure);//ADC初始化
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ADC_Cmd(ADC1, ENABLE);//开启AD转换器
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g_Adc_Inited=1;
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}
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void Adc_DeInit (void)
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{
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ADC_Cmd(ADC1, DISABLE);
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ADC_DeInit();
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, DISABLE);
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}
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//获得ADC值
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//ch: @ref ADC_channels
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//通道值 0~16取值范围为：ADC_Channel_0~ADC_Channel_16
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//返回值:转换结果
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u16 Get_Adc(u8 ch)
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{
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if (g_Adc_Inited==0) return 0;
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//设置指定ADC的规则组通道，一个序列，采样时间
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ADC_RegularChannelConfig(ADC1, ch, 1, ADC_SampleTime_3Cycles ); //ADC1,ADC通道,480个周期,提高采样时间可以提高精确度
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ADC_SoftwareStartConv(ADC1); //使能指定的ADC1的软件转换启动功能
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u32 t=10000;
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while((!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ))&&t--);//等待转换结束
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if (t==(u32)-1)
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{
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//Adc_Init();
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}
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ADC_ClearFlag (ADC1,ADC_FLAG_EOC);
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return ADC_GetConversionValue(ADC1); //返回最近一次ADC1规则组的转换结果
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}
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