STM32的ADC多通道采样，使用DMA传出数据，并且通过串口打印ADC各个通道的采样值
单片机源程序如下:
- #include "led.h"
- #include "delay.h"
- #include "sys.h"
- #include "usart.h"
- #include "adc.h"
- #include "dma.h"
- #define M 9 //为9个通道
- extern vu16 After_Adc[M]; //用来存放求平均值之后的结果
- u16 value[M];
- int main(void)
- {
- int i;
- NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
- Delay_conf(72); //延时函数初始化
- Adc_Init(); //ADC初始化
- uart_init(9600); //串口初始化为9600
- LED_Init(); //初始化与LED连接的硬件接口
- DMA_Configuration();
- printf("\r\n你好\r\n");
- while(1)
- {
- ADC_smooth();
- for(i=0;i<M;i++)
- {
- value[i]= Getvolt(After_Adc[i]);
- printf("value[%d]:\t%d.%dv\n",i,value[i]/100,value[i]%100) ;
- delay_ms(100);
- }
- }
- }
-
- #include "adc.h"
- #include "delay.h"
- extern const int M; //为10个通道
- 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通道时钟
-
- RCC_ADCCLKConfig(RCC_PCLK2_Div6); //设置ADC分频因子6 72M/6=12,ADC最大时间不能超过14M
-
- //PA0/1/2 作为模拟通道输入引脚
- 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; //模拟输入引脚
- GPIO_Init(GPIOA, &GPIO_InitStructure);
- //PB0/1 作为模拟通道输入引脚
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模拟输入引脚
- GPIO_Init(GPIOB, &GPIO_InitStructure);
- //PC0/1/2/3/4/5 作为模拟通道输入引脚
- 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; //模拟输入引脚
- GPIO_Init(GPIOC, &GPIO_InitStructure);
- ADC_DeInit(ADC1); //复位ADC1,将外设 ADC1 的全部寄存器重设为缺省值
- ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //ADC工作模式:ADC1和ADC2工作在独立模式
- ADC_InitStructure.ADC_ScanConvMode =ENABLE; //模数转换工作在扫描模式
- ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //模数转换工作在连续转换模式
- ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //外部触发转换关闭
- ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //ADC数据右对齐
- ADC_InitStructure.ADC_NbrOfChannel = M; //顺序进行规则转换的ADC通道的数目
- ADC_Init(ADC1, &ADC_InitStructure); //根据ADC_InitStruct中指定的参数初始化外设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 );
-
-
- // 开启ADC的DMA支持（要实现DMA功能，还需独立配置DMA通道等参数）
- ADC_DMACmd(ADC1, ENABLE);
-
-
- ADC_Cmd(ADC1, ENABLE); //使能指定的ADC1
-
- ADC_ResetCalibration(ADC1); //使能复位校准
-
- while(ADC_GetResetCalibrationStatus(ADC1)); //等待复位校准结束
-
- ADC_StartCalibration(ADC1); //开启AD校准
-
- while(ADC_GetCalibrationStatus(ADC1)); //等待校准结束
-
- ADC_SoftwareStartConvCmd(ADC1, ENABLE); //使能指定的ADC1的软件转换启动功能
- }
- //获得ADC值
- //ch:通道值 0~3
- u16 Get_Adc(u8 ch)
- {
- //设置指定ADC的规则组通道，一个序列，采样时间
- ADC_RegularChannelConfig(ADC1, ch, 1, ADC_SampleTime_239Cycles5 ); //ADC1,ADC通道,采样时间为239.5周期
-
- ADC_SoftwareStartConvCmd(ADC1, ENABLE); //使能指定的ADC1的软件转换启动功能
-
- while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC ));//等待转换结束
- return ADC_GetConversionValue(ADC1); //返回最近一次ADC1规则组的转换结果
- }
- 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;
- }
所有资料51hei提供下载:
ADC扫描模式连续转换之DMA传输.rar
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