2019年04月27日 | 谈谈STM32F051的 ADC DMA用法

首先谈谈引脚  STM32F051R8T6 多达16个  12bit外部AD通道。同时还有片内温度。电压基准，VBAT三个通道。对一般的AD使用来说是完全够用了。16个AD通道分别分布在

AD0  -AD7  对应引脚 是PA0-PA7   AD8-AD9对应引脚PB0-PB1      AD10-AD11对应引脚是PC0-PC5。  在这里我们就以PA0作为一个输入在写个例子。

//#include

#include

#include

#include

#include

#include "systick.h"

#include "LCD32.h"

#include "font.h"

#define ADC1_DR_Address                0x40012440

volatile uint16_t RegularConvData_Tab;  //ÓÃÓÚ´¢´æ´ÓADC¶Áµ½µÄÖµ

void LedInit()

{

GPIO_InitTypeDef gpiostudy;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB ,ENABLE);//ʹÄÜAHBÍâÉèGPIOBʱÖÓ

gpiostudy.GPIO_Pin=GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6

|GPIO_Pin_7;

gpiostudy.GPIO_Mode=GPIO_Mode_OUT;

gpiostudy.GPIO_Speed=GPIO_Speed_50MHz;

gpiostudy.GPIO_PuPd=GPIO_PuPd_NOPULL;

gpiostudy.GPIO_OType = GPIO_OType_PP;

GPIO_Init(GPIOB,&gpiostudy);  

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC ,ENABLE);//ʹÄÜAHBÍâÉèGPIOCʱÖÓ

gpiostudy.GPIO_Pin=GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6

|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_11|GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14;

gpiostudy.GPIO_Mode=GPIO_Mode_OUT;

gpiostudy.GPIO_Speed=GPIO_Speed_50MHz;

gpiostudy.GPIO_PuPd=GPIO_PuPd_NOPULL;

gpiostudy.GPIO_OType = GPIO_OType_PP;   

GPIO_Init(GPIOC,&gpiostudy);  

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA ,ENABLE);//ʹÄÜAHBÍâÉèGPIOAʱÖÓ

gpiostudy.GPIO_Pin=GPIO_Pin_11;

gpiostudy.GPIO_Mode=GPIO_Mode_OUT;

gpiostudy.GPIO_Speed=GPIO_Speed_50MHz;

gpiostudy.GPIO_PuPd=GPIO_PuPd_NOPULL;

gpiostudy.GPIO_OType = GPIO_OType_PP;

GPIO_Init(GPIOA,&gpiostudy); 

}

/********************************************************************************

º¯ÊýÃû£ºADC_DMA_Config

¹¦ÄÜ£ºADC DMA³õʼ»¯£¬ADCͨµÀÑ¡Ôñ

*******************************************************************************/

void   ADC_DMA_Config()

{

ADC_InitTypeDef     ADC_InitStruct;

  DMA_InitTypeDef     DMA_InitStruct;

GPIO_InitTypeDef    GPIO_InitStruct;

ADC_DeInit(ADC1);

/* Enable  GPIOA clock */

//  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

  /* ADC1 Periph clock enable */

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

  /* DMA1 clock enable */

  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 , ENABLE);

/* Configure PA.0  as analog input */

/*GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1;

  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;

GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL ;

  GPIO_Init(GPIOA, &GPIO_InitStruct); */ // PA1,ÊäÈëʱ²»ÓÃÉèÖÃËÙÂÊ

 /* DMA1 Channel1 Config */

  DMA_DeInit(DMA1_Channel1);

  DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;  //ÉèÖÃÍâÉè»ùµØÖ·

  DMA_InitStruct.DMA_MemoryBaseAddr = (uint32_t)&RegularConvData_Tab;

  DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralSRC;

  DMA_InitStruct.DMA_BufferSize =4;

  DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

  DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;

  DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;

  DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;

  DMA_InitStruct.DMA_Mode = DMA_Mode_Circular;

  DMA_InitStruct.DMA_Priority = DMA_Priority_High;

  DMA_InitStruct.DMA_M2M = DMA_M2M_Disable;

  DMA_Init(DMA1_Channel1, &DMA_InitStruct);

//   /* ADC DMA request in circular mode */

  ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);

 /* DMA1 Channel1 enable */

  DMA_Cmd(DMA1_Channel1, ENABLE);

//   /* ADC DMA request in circular mode */

  ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);

/* Initialize ADC structure */

ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b;

  ADC_InitStruct.ADC_ContinuousConvMode = ENABLE; 

  ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;

  ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;

  ADC_InitStruct.ADC_ScanDirection = ADC_ScanDirection_Backward; 

ADC_StructInit(&ADC_InitStruct);

  ADC_Init(ADC1, &ADC_InitStruct); 

//   /* Convert the ADC1 temperature sensor  with 55.5 Cycles as sampling time */ 

//   ADC_ChannelConfig(ADC1, ADC_Channel_TempSensor , ADC_SampleTime_55_5Cycles);  

//   ADC_TempSensorCmd(ENABLE);

  /* Convert the ADC1 Vref  with 55.5 Cycles as sampling time */ 

  ADC_ChannelConfig(ADC1, ADC_Channel_1  , ADC_SampleTime_55_5Cycles); 

  // ADC_VrefintCmd(ENABLE);

  /* ADC Calibration */

  ADC_GetCalibrationFactor(ADC1);

   ADC_DMACmd(ADC1, ENABLE);

  /* Enable ADC1 */

  ADC_Cmd(ADC1, ENABLE);     

  /* Wait the ADCEN falg */

  while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN)); 

  /* ADC1 regular Software Start Conv */ 

  ADC_StartOfConversion(ADC1);  //¼ÓÉÏÕâ¸öº¯Êý£¬LCDÏÔʾ³öÎÊÌâ¡£²»¼ÓÕâ¸öº¯Êý£¬LCDÏÔʾÕý³£

}

/**

  * @brief  ADC1 channel with DMA configuration

  * @param  None

  * @retval None

  */

void ADC1_CH_DMA_Config(void)

{

  ADC_InitTypeDef     ADC_InitStructure;

  DMA_InitTypeDef     DMA_InitStructure;

  /* ADC1 DeInit */  

  ADC_DeInit(ADC1);

  /* ADC1 Periph clock enable */

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

  /* DMA1 clock enable */

  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 , ENABLE);

  /* DMA1 Channel1 Config */

  DMA_DeInit(DMA1_Channel1);

  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;

  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&RegularConvData_Tab;

  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);

  /* DMA1 Channel1 enable */

  DMA_Cmd(DMA1_Channel1, ENABLE);

  /* ADC DMA request in circular mode */

  ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);

  /* Enable ADC_DMA */

  ADC_DMACmd(ADC1, ENABLE);  

  /* Initialize ADC structure */

  ADC_StructInit(&ADC_InitStructure);

  /* Configure the ADC1 in continous mode withe a resolutuion equal to 12 bits  */

  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;

  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; 

  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;

  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

  ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Backward;

  ADC_Init(ADC1, &ADC_InitStructure); 

  /* Convert the ADC1 temperature sensor  with 55.5 Cycles as sampling time */ 

 // ADC_ChannelConfig(ADC1, ADC_Channel_TempSensor , ADC_SampleTime_55_5Cycles);  

 // ADC_TempSensorCmd(ENABLE);

  /* Convert the ADC1 Vref  with 55.5 Cycles as sampling time */ 

  ADC_ChannelConfig(ADC1, ADC_Channel_1 , ADC_SampleTime_55_5Cycles); 

 // ADC_VrefintCmd(ENABLE);

  /* ADC Calibration */

  ADC_GetCalibrationFactor(ADC1);

  /* Enable ADC1 */

  ADC_Cmd(ADC1, ENABLE);     

  /* Wait the ADCEN falg */

  while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN)); 

  /* ADC1 regular Software Start Conv */ 

  ADC_StartOfConversion(ADC1);

}

int main()

{

SystemInit();

//GPIO_DeInit(GPIOB);

// GPIO_DeInit(GPIOC);

LedInit();

// Uart_NVICInit();

// SysTick_Config(SysTick_CLKSource_HCLK);   //sistickʱÖÓԴΪAHB ʱÖÓ

GPIO_ResetBits(GPIOA,GPIO_Pin_11);//µÆÁÁ

Systick_NVICInit();

// Delay(2000);

BACK_COLOR=BLACK;

 POINT_COLOR=WHITE; 

Lcd_Init();

// 

/* GPIO_SetBits(GPIOA,GPIO_Pin_11);//µÆÃðÁ

Delay(2000);

LCD_Clear(RED);  

GPIO_ResetBits(GPIOA,GPIO_Pin_11);//µÆÁÁ

Delay(3000);

LCD_Clear(GREEN);

Delay(3000);

LCD_WR_DATA8(0x0f,0x0f);

*/

// 

//

// LCD_DrawPoint_big(100,100);

// LCD_DrawPoint(100,100);

//LCD_Fill(0,0,120,120,BLUE);

//LCD_DrawLine(0,0,150,150);

// LCD_DrawRectangle(100,100,200,200);

//Draw_Circle(100,100,100);

//LCD_ShowNum(100,100,102,3);//ʧ°Ü

// LCD_ShowChar(10,10,'a',0);//ʧ°Ü

LCD_Clear(BLACK);

LCD_ShowString(55,30,"ADC-DMA TEST");

ADC1_CH_DMA_Config();

// showhanzi(100,100,0);

// showhanzi(135,100,1);

//showhanzi(170,100,2);

//showimage();

while(1)

{ 

// GPIO_ResetBits(GPIOA,GPIO_Pin_11);

// Delay(1000);  //1s

// GPIO_SetBits(GPIOA,GPIO_Pin_11);

// Delay(2000);  //1s¡

// ADC_ConvertedValueLocal= RegularConvData_Tab;

// Delay(1000);  //1s

/* Test DMA1 TC flag */

    while((DMA_GetFlagStatus(DMA1_FLAG_TC1)) == RESET ); 

    /* Clear DMA TC flag */

    DMA_ClearFlag(DMA1_FLAG_TC1);

LCD_ShowString(20,60,"adc  value:");

LCD_ShowNum(120,60,RegularConvData_Tab,4);

// ADC1->CR&=(~(1<<2))|(~(1<<0));

// ADC1->CR|=(1<<2);

}

}

DMA方式，最主要的就是配置。配置完了，就什么就不用管了。