各位大哥大神,你们好,我在进行ADC双通道采集时发现两个通道都能正确读取电压值,但是我的代码本意是想打印出两个通道的值,可任意单独改变某一通道的电压时,发现打印出的两个值是一样的,也就是说两个通
[mw_shl_code=c,true]#include "adc.h"
#define ADC1_DR_Address ((u32)0x4001244C)
__IO u16 ADC_ConvertedValue[2];
/*
* 函数名:ADC1_GPIO_Config
* 描述 :使能ADC1和DMA1的时钟,初始化PC.01
* 输入 : 无
* 输出 :无
* 调用 :内部调用
*/
static void ADC1_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable DMA clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
/* Enable ADC1 and GPIOC clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_GPIOC,ENABLE);
RCC_ADCCLKConfig(RCC_PCLK2_Div8);
/* Configure PC.01 \02 as analog input */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure); // PC1,输入时不用设置速率
}
/* 函数名:ADC1_Mode_Config
* 描述 :配置ADC1的工作模式为MDA模式
* 输入 : 无
* 输出 :无
* 调用 :内部调用
*/
static void ADC1_Mode_Config(void)
{
DMA_InitTypeDef DMA_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
/* DMA channel1 configuration */
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)ADC_ConvertedValue;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 2;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
/* Enable DMA channel1 */
DMA_Cmd(DMA1_Channel1, ENABLE);
/* ADC1 configuration */
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel =2;
ADC_Init(ADC1,&ADC_InitStructure);
/* ADC1 regular channel11 configuration */
ADC_RegularChannelConfig(ADC1, ADC_Channel_11,1, ADC_SampleTime_239Cycles5 );
ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 2, ADC_SampleTime_239Cycles5 );
/* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE);
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
/* Enable ADC1 reset calibaration register */
ADC_ResetCalibration(ADC1);
/* Check the end of ADC1 reset calibration register */
while(ADC_GetResetCalibrationStatus(ADC1));
/* Start ADC1 calibaration */
ADC_StartCalibration(ADC1);
/* Check the end of ADC1 calibration */
while(ADC_GetCalibrationStatus(ADC1));
/* Start ADC1 Software Conversion */
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}
/*
* 函数名:ADC1_Init
* 描述 :无
* 输入 :无
* 输出 :无
* 调用 :外部调用
*/
void ADC1_Init(void)
{
ADC1_GPIO_Config();
ADC1_Mode_Config();
}
[/mw_shl_code]
[mw_shl_code=c,true] for(i=0;i<2;i++)
{
ADC_ConvertedValueLocal =(ADC_ConvertedValue*330)/4096; // 读取转换的AD值
} // 读取转换的AD值
Delay(20); // 延时
printf("%.3f\n", ADC_ConvertedValueLocal[0]/100);
Delay(20);
printf("%.3f\n", ADC_ConvertedValueLocal[1]/100);
[/mw_shl_code]
道似乎被连起来了,或者说串口接收到的数据只是一个通道的。而且这通道属于被改变电压的那个通道。 |