关于ADC1 DMA 多通道模数转换，得到数据错乱的问题

belle0206 · 发表于 2021-1-4 10:50:57

我用模数转换ADC1配置6通道模数转换，通过DMA进行数据传输。最后发现得到数据是乱的（通道1：63 1A ，A2 CA ，98 1A ，CE 98， 77 7C ，44 2C），其他通道在未接任何电位器情况下，数据也是乱的（如通道一）。STM32单片机经验有限，找了好久，找不到愿因。希望大家帮我看看问题在哪。
在系统中，我开启了串口123和定时器234，其中TIM4作为PWM输出时钟。
#include "sys.h"
#include "delay.h"
#include "usart.h"
#include "led.h"
#include "key.h"
#include "timer.h"
#include "iwdg.h"
#include "adc.h"

int main(void)
{
HAL_Init();
Stm32_Clock_Init(RCC_PLL_MUL9);
delay_init(72);
      MY_DMA_Init()；
uart_init(); //串口1.2.3
LED_Init();
KEY_GPIO_Init();
TIMx_Init(); //定时器2.3.4
MY_ADC1_Init(); //ADC13õê¼»ˉ

HAL_ADC_Start_DMA(&ADC1_Handler,(uint32_t*)&ADC_Value,600);//ADC，DMA规则转换
while(1)
{
NUMB1 = power_val.word;
__HAL_TIM_SET_COMPARE(&TIM4_Handler, TIM_CHANNEL_1, NUMB1); //PWM

speed_vol_read();  //按键读取程序

read_ADC_average(); //读取ADC转换值
temp1_value.word = (uint16_t)temp1_value_AD; //ÎÂ¶è1
data[0] = temp1_value.dc.hi;
data[1] = temp1_value.dc.lo;

if(speed_vol_on == 1) //发送采样值到串口
{
speed_vol_on = 0;
HAL_UART_Transmit(&UART1_Handler,(uint8_t*)data,2,1000); //·￠Ëí½óêÕμ½μÄêy¾Y
while(__HAL_UART_GET_FLAG(&UART1_Handler,UART_FLAG_TC)!=SET); //μè′y·￠Ëí½áêø
}
}
}

/*************ADC、DMA 配置****************/
#include "adc.h"
#include "delay.h"

ADC_HandleTypeDef ADC1_Handler; //ADC
DMA_HandleTypeDef DMA1_Handler;    //DMA

uint32_t ADC_Value[600]; //ADC数据缓存区
uint32_t temp1_value_AD,temp2_value_AD,temp3_value_AD,temp4_value_AD,pow_value_AD,swr_value_AD; //转换值寄存器

//初始化ADC
//ch: ADC_channels

void MY_ADC1_Init(void)
{
RCC_PeriphCLKInitTypeDef ADC_CLKInit;
ADC_ChannelConfTypeDef ADC1_Channel;

ADC1_Handler.Instance=ADC1;
ADC1_Handler.Init.ScanConvMode=ADC_SCAN_ENABLE;             //é¨ÃèÄ￡ê½
ADC1_Handler.Init.ContinuousConvMode=ENABLE;             //á¬Dø×a»»
ADC1_Handler.Init.DiscontinuousConvMode=DISABLE;          //½ûÖ12»á¬Dø2éÑùÄ￡ê½
ADC1_Handler.Init.DataAlign=ADC_DATAALIGN_RIGHT;          //óò¶ÔÆë
ADC1_Handler.Init.NbrOfConversion=6;                      //6¸ö×a»»Ôú1æÔòDòáDÖD ò2¾íêÇÖ»×a»»1æÔòDòáD1
// ADC1_Handler.Init.NbrOfDiscConversion=0;                   //2»á¬Dø2éÑùí¨μàêyÎa0
ADC1_Handler.Init.ExternalTrigConv=ADC_SOFTWARE_START;    //èí¼t′￥·￠?????
while(HAL_ADC_Init(&ADC1_Handler) != HAL_OK){;}                               //3õê¼»ˉ

/****í¨μàÅäÖÃ****/
ADC1_Channel.Channel = ADC_CHANNEL_0;
ADC1_Channel.Rank = ADC_REGULAR_RANK_1;
ADC1_Channel.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
while(HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_Channel) != HAL_OK)
{;}
ADC1_Channel.Channel = ADC_CHANNEL_1;
ADC1_Channel.Rank = ADC_REGULAR_RANK_2;
ADC1_Channel.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
while(HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_Channel) != HAL_OK)
{;}
ADC1_Channel.Channel = ADC_CHANNEL_2;
ADC1_Channel.Rank = ADC_REGULAR_RANK_3;
ADC1_Channel.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
while(HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_Channel) != HAL_OK)
{;}
ADC1_Channel.Channel = ADC_CHANNEL_3;
ADC1_Channel.Rank = ADC_REGULAR_RANK_4;
ADC1_Channel.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
while(HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_Channel) != HAL_OK)
{;}
ADC1_Channel.Channel = ADC_CHANNEL_4;
ADC1_Channel.Rank = ADC_REGULAR_RANK_5;
ADC1_Channel.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
while(HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_Channel) != HAL_OK)
{;}
ADC1_Channel.Channel = ADC_CHANNEL_5;
ADC1_Channel.Rank = ADC_REGULAR_RANK_6;
ADC1_Channel.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
while(HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_Channel) != HAL_OK)
{;}

// HAL_ADCEx_Calibration_Start(&ADC1_Handler);    //D￡×¼ADC
}

//ADC驱动，引脚配置，时钟使能
//此函数会被HAL_ADC_Init()调用
//配置DMA
void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc)
{
GPIO_InitTypeDef GPIO_Initure;
  if(hadc->Instance==ADC1)
  {
__HAL_RCC_ADC1_CLK_ENABLE();          //使能ADC1时钟
__HAL_RCC_GPIOA_CLK_ENABLE(); //开启GPIOA时钟

GPIO_Initure.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3|GPIO_PIN_4|GPIO_PIN_5;          //PA0~5
GPIO_Initure.Mode = GPIO_MODE_ANALOG;    //模拟
GPIO_Initure.Pull = GPIO_NOPULL;       //不上下拉
HAL_GPIO_Init(GPIOA,&GPIO_Initure);

/* ADC1 DMA Init */

//DMA1配置
DMA1_Handler.Instance = DMA1_Channel1;             //通道
DMA1_Handler.Init.Direction=DMA_PERIPH_TO_MEMORY;      //外设到内存
DMA1_Handler.Init.PeriphInc=DMA_PINC_DISABLE;       //外设非增量模式
DMA1_Handler.Init.MemInc=DMA_MINC_ENABLE;      //内存增量模式
DMA1_Handler.Init.PeriphDataAlignment=DMA_PDATAALIGN_WORD;    //外设数据长度
DMA1_Handler.Init.MemDataAlignment=DMA_PDATAALIGN_WORD;    //存储器数据长度
DMA1_Handler.Init.Mode=DMA_CIRCULAR;         //外设循环模式
DMA1_Handler.Init.Priority=DMA_PRIORITY_LOW;    //优先级低

while(HAL_DMA_Init(&DMA1_Handler) != HAL_OK){;}

__HAL_LINKDMA(hadc,DMA_Handle,DMA1_Handler);
  }
}
void MY_DMA_Init(void)
{
__HAL_RCC_DMA1_CLK_ENABLE(); //DMA1时钟使能
HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);
}

//获取6通道的转换值，取100次转换的平均值
void read_ADC_average(void)
{
int time;
temp1_value_AD = 0;
temp2_value_AD = 0;
temp3_value_AD = 0;
temp4_value_AD = 0;
pow_value_AD = 0;
swr_value_AD = 0;
for(time=0;time<600;time=time+6)
{
temp1_value_AD = temp1_value_AD + ADC_Value[time];
temp2_value_AD = temp2_value_AD + ADC_Value[time+1];
temp3_value_AD = temp3_value_AD + ADC_Value[time+2];
temp4_value_AD = temp4_value_AD + ADC_Value[time+3];
pow_value_AD = pow_value_AD + ADC_Value[time+4];
swr_value_AD = swr_value_AD + ADC_Value[time+5];
}
temp1_value_AD = (uint32_t)temp1_value_AD/100;
temp2_value_AD = (uint32_t)temp2_value_AD/100;
temp3_value_AD = (uint32_t)temp3_value_AD/100;
temp4_value_AD = (uint32_t)temp4_value_AD/100;
pow_value_AD = (uint32_t)pow_value_AD/100;
swr_value_AD = (uint32_t)swr_value_AD/100;

}