stm32f1的adc掃描模式并通過(guò)DMA輸入

ID:389034 · 發(fā)表于 2018-8-22 20:49

#include "adc.h"
#include "delay.h"
//初始化ADC
//這里我們僅以規(guī)則通道為例
//我們默認(rèn)將開(kāi)啟通道0~3
extern const int M; //為10個(gè)通道
void Adc_Init(void)
{
ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_GPIOB| RCC_APB2Periph_GPIOC|RCC_APB2Periph_ADC1 , ENABLE ); //使能ADC1通道時(shí)鐘
RCC_ADCCLKConfig(RCC_PCLK2_Div6); //設(shè)置ADC分頻因子6 72M/6=12,ADC最大時(shí)間不能超過(guò)14M
//PA0/1/2 作為模擬通道輸入引腳
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0| GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模擬輸入引腳
GPIO_Init(GPIOA, &GPIO_InitStructure);
//PB0/1 作為模擬通道輸入引腳
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模擬輸入引腳
GPIO_Init(GPIOB, &GPIO_InitStructure);
//PC0/1/2/3/4/5 作為模擬通道輸入引腳
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模擬輸入引腳
GPIO_Init(GPIOC, &GPIO_InitStructure);
ADC_DeInit(ADC1); //復(fù)位ADC1,將外設(shè) ADC1 的全部寄存器重設(shè)為缺省值
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //ADC工作模式:ADC1和ADC2工作在獨(dú)立模式
ADC_InitStructure.ADC_ScanConvMode =ENABLE; //模數(shù)轉(zhuǎn)換工作在掃描模式
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //模數(shù)轉(zhuǎn)換工作在連續(xù)轉(zhuǎn)換模式
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //外部觸發(fā)轉(zhuǎn)換關(guān)閉
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //ADC數(shù)據(jù)右對(duì)齊
ADC_InitStructure.ADC_NbrOfChannel = M; //順序進(jìn)行規(guī)則轉(zhuǎn)換的ADC通道的數(shù)目
ADC_Init(ADC1, &ADC_InitStructure); //根據(jù)ADC_InitStruct中指定的參數(shù)初始化外設(shè)ADCx的寄存器
ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 1, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 2, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 3, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 4, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 5, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 6, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 7, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 8, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 9, ADC_SampleTime_239Cycles5 );
// ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 10, ADC_SampleTime_239Cycles5 );
// ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 11, ADC_SampleTime_239Cycles5 );
// ADC_RegularChannelConfig(ADC1, ADC_Channel_15, 12, ADC_SampleTime_239Cycles5 );
// 開(kāi)啟ADC的DMA支持（要實(shí)現(xiàn)DMA功能，還需獨(dú)立配置DMA通道等參數(shù)）
ADC_DMACmd(ADC1, ENABLE);
ADC_Cmd(ADC1, ENABLE); //使能指定的ADC1
ADC_ResetCalibration(ADC1); //使能復(fù)位校準(zhǔn)
while(ADC_GetResetCalibrationStatus(ADC1)); //等待復(fù)位校準(zhǔn)結(jié)束
ADC_StartCalibration(ADC1); //開(kāi)啟AD校準(zhǔn)
while(ADC_GetCalibrationStatus(ADC1)); //等待校準(zhǔn)結(jié)束
ADC_SoftwareStartConvCmd(ADC1, ENABLE); //使能指定的ADC1的軟件轉(zhuǎn)換啟動(dòng)功能
}
//獲得ADC值
//ch:通道值 0~3
u16 Get_Adc(u8 ch)
{
//設(shè)置指定ADC的規(guī)則組通道，一個(gè)序列，采樣時(shí)間
ADC_RegularChannelConfig(ADC1, ch, 1, ADC_SampleTime_239Cycles5 ); //ADC1,ADC通道,采樣時(shí)間為239.5周期
ADC_SoftwareStartConvCmd(ADC1, ENABLE); //使能指定的ADC1的軟件轉(zhuǎn)換啟動(dòng)功能
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));//等待轉(zhuǎn)換結(jié)束
return ADC_GetConversionValue(ADC1); //返回最近一次ADC1規(guī)則組的轉(zhuǎn)換結(jié)果
}
u16 Get_Adc_Average(u8 ch,u8 times)
{
u32 temp_val=0;
u8 t;
for(t=0;t<times;t++)
{
temp_val+=Get_Adc(ch);
delay_ms(5);
}
return temp_val/times;
}

復(fù)制代碼

頭文件和dma配置請(qǐng)從附件中下載

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stm32f1的adc掃描模式并通過(guò)DMA輸入