ADC1
void ADC_channel_init(void)
{
/*
通道0 PA0
通道1 PA1
通道2 PA2
通道3 PA3
通道4 PA4
通道5 PA5
通道6 PA6
通道7 PA7
通道8 PB0
通道9 PB1
通道10 PC0
通道11 PC1
通道12 PC2
通道13 PC3
通道14 PC4
通道15 PC5
*/
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOC, ENABLE);
//PA0/1/2/3 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_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模拟输入引脚
GPIO_Init(GPIOA, &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);
}
void ADC1_Configuration(void)
{
ADC_InitTypeDef ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
/* ADC Common Init **********************************************************/
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent; //ADC工作模式:ADC1和ADC2工作在独立模式
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;//2分频
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
/* ADC3 Init ****************************************************************/
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
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_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;//外部触发转换关闭
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//ADC数据右对齐
ADC_InitStructure.ADC_NbrOfConversion = M;
ADC_Init(ADC3, &ADC_InitStructure);
//设置指定ADC的规则组通道，设置它们的转化顺序和采样时间
//ADC1,ADC通道x,规则采样顺序值为y,采样时间为3周期
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_3Cycles);
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_3Cycles);
ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3, ADC_SampleTime_3Cycles );
ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4, ADC_SampleTime_3Cycles );
ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 5, ADC_SampleTime_3Cycles);
ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 6, ADC_SampleTime_3Cycles );
ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 7, ADC_SampleTime_3Cycles );
ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 8, ADC_SampleTime_3Cycles );
ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 9, ADC_SampleTime_3Cycles );
ADC_RegularChannelConfig(ADC1, ADC_Channel_15, 10, ADC_SampleTime_3Cycles );
/* Enable DMA request after last transfer (Single-ADC mode) */
ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
ADC_DMACmd(ADC1, ENABLE);
ADC_Cmd(ADC1, ENABLE);
}
void DMA_Configuration(void)
{
/* DMA1 Stream0 channel2 configuration **************************************/
DMA_InitTypeDef DMA_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);//使能时钟
DMA_InitStructure.DMA_Channel = DMA_Channel_1;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR; //DMA外设ADC基地址
// DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_ADDRESS;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&AD_Value;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = N*M;//DMA通道的DMA缓存的大小
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外设地址寄存器不变
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//内存地址寄存器递增
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//数据宽度为16位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//数据宽度为16位
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//工作在循环缓存模式
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMA通道 x拥有高优先级
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA1_Stream0, &DMA_InitStructure);
DMA_Cmd(DMA1_Stream0, ENABLE);
}
uint16_t GetVolt(uint16_t advalue)
{
return (uint16_t)(advalue * 330 / 4096); //求的结果扩大了100倍，方便下面求出小数
}
void filter(void)
{
int sum = 0;
uint8_t count;
for(int i=0;i<10;i++)
{
for ( count=0;count<N;count++)
{
sum += AD_Value[i][count];
}
After_filter[i]=sum/N;
sum=0;
}
}
main:
uint16_t AD_Value[M][N]; //用来存放ADC转换结果，也是DMA的目标地址
uint16_t After_filter[M]; //用来存放求平均值之后的结果
int main(void)
{
bsp_InitUart();
delay_init(180);
ADC_channel_init();
ADC1_Configuration();
DMA_Configuration();
uint16_t value[M];
while(1)
{
filter();
for(int i=0;i<M;i++)
{
value[i]= GetVolt(After_filter[i]);
printf("value[%d]:%dV %dV\r\n",i,value[i]/100,value[i]);
delay_ms(100);
}
}
}
打印出来的值都为0，求大神指导，是不是哪里设置错了？ |
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1.输入是否有值？
我参考参考。。。
