关于在中断中ADC采样问题

繁星点点starry · 发表于 2018-7-25 17:21:21

把ADC采样放在了time.c的中断中，但是我改变时钟的频率的时候  发现采样频率并没有发生改变，有大神可以帮我看一下是哪里出问题了吗？
ADC函数：
**
  ******************************************************************************
  * @file bsp_xxx.c
  * @Author  fire
  * @version V1.0
  * @date 2013-xx-xx
  * @brief adc1 ó|óÃbsp / DMA Ä￡ê½
  ******************************************************************************
  * @attention
  *
  * êμÑéÆ½ì¨:ò°»e iSO STM32 ¿a·￠°å
  * ÂÛì3 :http://www.chuxue123.com
  * ìÔ±| :http://firestm32.taobao.com
  *
  ******************************************************************************
  */

#include "adc.h"

#define ADC1_DR_Address ((u32)0x40012400+0x4c)

__IO uint16_t ADC_ConvertedValue;
//__IO u16 ADC_ConvertedValueLocal;

/**
  * @brief  ê1ÄüADC1oíDMA1μÄê±Öó￡¬3õê¼»ˉPC.01
  * @param  ÎT
  * @retval ÎT
  */
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_GPIOB|RCC_APB2Periph_GPIOC, ENABLE);

/* Configure PC.01  as analog input */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;  //éèÖÃÎaÄ￡ÄaêäèëÄ￡ê½¿éóÃóúÄ￡ÄaμçÑ1μÄêäèë
GPIO_Init(GPIOA, &GPIO_InitStructure); // PB0,êäèëê±2»óÃéèÖÃËùÂê

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;  //éèÖÃÎaÄ￡ÄaêäèëÄ￡ê½¿éóÃóúÄ￡ÄaμçÑ1μÄêäèë
GPIO_Init(GPIOA, &GPIO_InitStructure); // PB1,êäèëê±2»óÃéèÖÃËùÂê

}

/**
  * @brief  ÅäÖÃADC1μÄ1¤×÷Ä￡ê½ÎaMDAÄ￡ê½
  * @param  ÎT
  * @retval ÎT
  */
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;      //ADCμØÖ·
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC_ConvertedValue; //Äú′æμØÖ·
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 2;  //í¨μàμÄ′óD¡éèÖÃÎa2
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //íaéèμØÖ·1ì¶¨
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;    //Äú′æμØÖ·μYÔö
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //°ë×Ö
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //Ñ-»·′«êä

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; //¶àá￠ADCÄ￡ê½
//Õaàïê1óÃáËADC1μÄí¨μà9oíí¨μà8￡¬ËùòÔê1Äüé¨ÃèÄ￡ê½
ADC_InitStructure.ADC_ScanConvMode = ENABLE ;      //½ûÖ1é¨ÃèÄ￡ê½￡¬é¨ÃèÄ￡ê½óÃóú¶àí¨μà2é¼ˉ

ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //¿aÆôá¬Dø×a»»Ä￡ê½￡¬¼′2»í￡μØ½øDDADC×a»»
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //2»ê1óÃía2¿′￥·￠×a»»
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //2é¼ˉêy¾Yóò¶ÔÆë
ADC_InitStructure.ADC_NbrOfChannel = 2;      //òa×a»»μÄí¨μàêyÄ¿2 ·Ö±eêÇí¨μà11oíí¨μà8
ADC_Init(ADC1, &ADC_InitStructure);

/*ÅäÖÃADCê±Öó￡¬ÎaPCLK2μÄ8·ÖÆμ￡¬¼′9MHz*/
RCC_ADCCLKConfig(RCC_PCLK2_Div6);
/*ÅäÖÃADC1μÄí¨μà11Îa55. 5¸ö2éÑùÖüÆú￡¬DòáDÎa1 */

//ÕaàïÎòÃÇÅäÖÃμÄêÇADC1μÄí¨μà8oíí¨μà9
//í¨μà8êÇÎòÃÇ×Ô¼oo¸½óμÄ¿a·￠°åμÄμçÑ1Öμ￡¬ò2êÇ×îÏè½øDDAD×a»»μÄí¨μà
//í¨μà9êÇ¿a·￠°åéÏμÄμçÑ1Öμ￡¬ò2êÇμú¶t′Î2aμ½μÄμçÑ1Öμ
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_55Cycles5);

/* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE);

/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);

/*¸′Î»D￡×¼¼Ä′æÆ÷ */
ADC_ResetCalibration(ADC1);
/*μè′yD￡×¼¼Ä′æÆ÷¸′Î»íê3é */
while(ADC_GetResetCalibrationStatus(ADC1));

/* ADCD￡×¼ */
ADC_StartCalibration(ADC1);
/* μè′yD￡×¼íê3é*/
while(ADC_GetCalibrationStatus(ADC1));

/* óéóúÃ»óD2éóÃía2¿′￥·￠￡¬ËùòÔê1óÃèí¼t′￥·￠ADC×a»» */
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}

/**
  * @brief  ADC13õê¼»ˉ
  * @param  ÎT
  * @retval ÎT
  */
void ADC1_Init(void)
{
ADC1_GPIO_Config();
ADC1_Mode_Config();
}
/*********************************************END OF FILE**********************/

时钟函数：
#include "timer.h"
#include "led.h"
#include "usart.h"
#define M 2  //2é¼ˉí¨μàμÄ×î′óêy
int flag=0;
int vol=0 ;
int volp=0;
extern __IO uint16_t ADC_ConvertedValue[M];
//////////////////////////////////////////////////////////////////////////////////
//±¾3ìDòÖ»1©Ñ§Ï°ê1óÃ￡¬Î′¾-×÷ÕßDí¿é￡¬2»μÃóÃóúÆäËüèÎoÎóÃí¾
//ALIENTE¾«ó￠STM32¿a·￠°å
//¶¨ê±Æ÷ Çy¶ˉ′úÂë
//ÕyμãÔ-×ó@ALIENTEK
//¼¼êõÂÛì3:www.openedv.com
//DT¸ÄèÕÆú:2012/9/4
//°æ±¾￡oV1.1
//°æè¨ËùóD￡¬μá°æ±Ø¾¿¡￡
//Copyright(C) 1ãÖYêDDÇòíμç×ó¿Æ¼¼óDÏT1«Ë¾ 2009-2019
//All rights reserved
//********************************************************************************
//V1.1 20120904
//1,Ôö¼óTIM3_PWM_Initoˉêy¡￡
//2,Ôö¼óLED0_PWM_VALoê¶¨òå￡¬¿ØÖÆTIM3_CH2Âö¿í
//////////////////////////////////////////////////////////////////////////////////

//í¨óÃ¶¨ê±Æ÷3ÖD¶Ï3õê¼»ˉ
//Õaàïê±ÖóÑ¡ÔñÎaAPB1μÄ2±¶￡¬¶øAPB1Îa36M
//arr￡o×Ô¶ˉÖØ×°Öμ¡￡
//psc￡oê±ÖóÔ¤·ÖÆμêy
//Õaàïê1óÃμÄêÇ¶¨ê±Æ÷3!
void TIM3_Int_Init(u16 arr,u16 psc)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //ê±Öóê1Äü

TIM_TimeBaseStructure.TIM_Period = arr; //éèÖÃÔúÏÂò»¸ö¸üDÂêÂ¼t×°èë»î¶ˉμÄ×Ô¶ˉÖØ×°ÔØ¼Ä′æÆ÷ÖüÆúμÄÖμ    ¼Æêyμ½5000Îa500ms
TIM_TimeBaseStructure.TIM_Prescaler =psc; //éèÖÃóÃà′×÷ÎaTIMxê±ÖóÆμÂê3yêyμÄÔ¤·ÖÆμÖμ  10KhzμÄ¼ÆêyÆμÂê
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //éèÖÃê±Öó·Ö¸î:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIMÏòéÏ¼ÆêyÄ￡ê½
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //¸ù¾YTIM_TimeBaseInitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉTIMxμÄê±¼ä»ùêyμ￥Î»

TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); //ê1ÄüÖ¸¶¨μÄTIM3ÖD¶Ï,ÔêDí¸üDÂÖD¶Ï

NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3ÖD¶Ï
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //ÏèÕ¼óÅÏè¼¶0¼¶
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //′óóÅÏè¼¶3¼¶
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μà±»ê1Äü
NVIC_Init(&NVIC_InitStructure);  //¸ù¾YNVIC_InitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèNVIC¼Ä′æÆ÷

TIM_Cmd(TIM3, ENABLE);  //ê1ÄüTIMxíaéè

}
//¶¨ê±Æ÷3ÖD¶Ï·tÎñ3ìDò
void TIM3_IRQHandler(void) //TIM3ÖD¶Ï
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //¼ì2éÖ¸¶¨μÄTIMÖD¶Ï·￠éúóë·ñ:TIM ÖD¶ÏÔ′
{
   //Çå3yTIMxμÄÖD¶Ï′y′|àíÎ»:TIM ÖD¶ÏÔ′

TIM_ClearITPendingBit(TIM3, TIM_IT_Update  );
//LED0=!LED0;
vol=ADC_ConvertedValue[0];
volp=ADC_ConvertedValue[1];
flag=1;
}

   //DAC_SetChannel1Data(DAC_Align_12b_R, dacval);
//adcx=Get_Adc_Average(ADC_Channel_1,10);
//vol=adcx;
   // printf("%6d\n",vol);

}

主函数：
#include "led.h"
#include "delay.h"
#include "key.h"
#include "sys.h"
//#include "lcd.h"
#include "usart.h"
//#include "dac.h"
#include "adc.h"
#include "timer.h"
#include "usmart.h"
#include "bsp_AdvanceTim.h"
#define M 2  //2é¼ˉí¨μàμÄ×î′óêy
//int vol;
//void Dac1_Set_Vol(u16 vol);
extern __IO uint16_t ADC_ConvertedValue[M];
long int xindian1[4],xindian2[4];//′æ·ÅμÃμ½μÄμçÑ1
int adcx0=0, adcx1=0, adcx2=0,adcx3=0;
extern int flag;
extern int flag1;
int vol1=0;
extern int vol;
extern int volp;
int dacval=0;
int dacval1=0;
int k=0,n=1,i=0;
int adccount=0;
int adccount1=0;
int adccount2=0;
int max=0,min=0,mid=0;
/************************************************
ALIENTEK¾«ó￠STM32¿a·￠°åêμÑé20
DAC êμÑé
¼¼êõÖ§3Ö￡owww.openedv.com
ìÔ±|μêÆì￡ohttp://eboard.taobao.com
1Ø×￠Î￠DÅ1«ÖúÆ½ì¨Î￠DÅoÅ￡o"ÕyμãÔ-×ó"￡¬Ãa·Ñ»ñè¡STM32×êáÏ¡￡
1ãÖYêDDÇòíμç×ó¿Æ¼¼óDÏT1«Ë¾
×÷Õß￡oÕyμãÔ-×ó @ALIENTEK
************************************************/

int main(void)
{
delay_init();            //Ñóê±oˉêy3õê¼»ˉ
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//éèÖÃÖD¶ÏóÅÏè¼¶·Ö×éÎa×é2￡o2Î»ÇàÕ¼óÅÏè¼¶￡¬2Î»Ïìó|óÅÏè¼¶
uart_init(115200);      //′®¿ú3õê¼»ˉÎa115200
//KEY_Init();    //3õê¼»ˉ°′¼ü3ìDò
LED_Init();       //LED¶Ë¿ú3õê¼»ˉ
//LCD_Init();         //LCD3õê¼»ˉ
  ADC1_Init();       //ADC3õê¼»ˉ
// Dac1_Init(); //DAC3õê¼»ˉ
ADVANCE_TIM_Init();
TIM3_Int_Init(4,71);//10KhzμÄ¼ÆêyÆμÂê￡¬¼Æêyμ½5000Îa500ms
   //TIM3_Int_Init(4999,7199);
//TIM2_PWM_Init(4999,7199);

while(1)
{

if(flag==1)
{

//DisplayCurve1(volp,vol);
if(adccount<200)
{
dacval +=vol;
dacval1 +=volp;
adccount++;
}
else
{
//dacval=dacval/200;
   dacval1=dacval1/200;
dacval=dacval/200;
DisplayCurve1(dacval1,dacval);
   adccount=0;
dacval=0;
   dacval1=0;

}
flag=0;[mw_shl_code=c,true]/**
  ******************************************************************************
  * @file bsp_xxx.c
  * @author  fire
  * @version V1.0
  * @date 2013-xx-xx
  * @brief adc1 ó|óÃbsp / DMA Ä￡ê½
  ******************************************************************************
  * @attention
  *
  * êμÑéÆ½ì¨:ò°»e iSO STM32 ¿a·￠°å
  * ÂÛì3 :http://www.chuxue123.com
  * ìÔ±| :http://firestm32.taobao.com
  *
  ******************************************************************************
  */

#include "adc.h"

#define ADC1_DR_Address ((u32)0x40012400+0x4c)

__IO uint16_t ADC_ConvertedValue;
//__IO u16 ADC_ConvertedValueLocal;

/**
  * @brief  ê1ÄüADC1oíDMA1μÄê±Öó￡¬3õê¼»ˉPC.01
  * @param  ÎT
  * @retval ÎT
  */
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_GPIOB|RCC_APB2Periph_GPIOC, ENABLE);

/* Configure PC.01  as analog input */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;  //éèÖÃÎaÄ￡ÄaêäèëÄ￡ê½¿éóÃóúÄ￡ÄaμçÑ1μÄêäèë
GPIO_Init(GPIOA, &GPIO_InitStructure); // PB0,êäèëê±2»óÃéèÖÃËùÂê

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;  //éèÖÃÎaÄ￡ÄaêäèëÄ￡ê½¿éóÃóúÄ￡ÄaμçÑ1μÄêäèë
GPIO_Init(GPIOA, &GPIO_InitStructure); // PB1,êäèëê±2»óÃéèÖÃËùÂê

}

/**
  * @brief  ÅäÖÃADC1μÄ1¤×÷Ä￡ê½ÎaMDAÄ￡ê½
  * @param  ÎT
  * @retval ÎT
  */
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;      //ADCμØÖ·
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC_ConvertedValue; //Äú′æμØÖ·
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 2;  //í¨μàμÄ′óD¡éèÖÃÎa2
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //íaéèμØÖ·1ì¶¨
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;    //Äú′æμØÖ·μYÔö
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //°ë×Ö
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //Ñ-»·′«êä

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; //¶àá￠ADCÄ￡ê½
//Õaàïê1óÃáËADC1μÄí¨μà9oíí¨μà8￡¬ËùòÔê1Äüé¨ÃèÄ￡ê½
ADC_InitStructure.ADC_ScanConvMode = ENABLE ;      //½ûÖ1é¨ÃèÄ￡ê½￡¬é¨ÃèÄ￡ê½óÃóú¶àí¨μà2é¼ˉ

ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //¿aÆôá¬Dø×a»»Ä￡ê½￡¬¼′2»í￡μØ½øDDADC×a»»
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //2»ê1óÃía2¿′￥·￠×a»»
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //2é¼ˉêy¾Yóò¶ÔÆë
ADC_InitStructure.ADC_NbrOfChannel = 2;      //òa×a»»μÄí¨μàêyÄ¿2 ·Ö±eêÇí¨μà11oíí¨μà8
ADC_Init(ADC1, &ADC_InitStructure);

/*ÅäÖÃADCê±Öó￡¬ÎaPCLK2μÄ8·ÖÆμ￡¬¼′9MHz*/
RCC_ADCCLKConfig(RCC_PCLK2_Div6);
/*ÅäÖÃADC1μÄí¨μà11Îa55. 5¸ö2éÑùÖüÆú￡¬DòáDÎa1 */

//ÕaàïÎòÃÇÅäÖÃμÄêÇADC1μÄí¨μà8oíí¨μà9
//í¨μà8êÇÎòÃÇ×Ô¼oo¸½óμÄ¿a·￠°åμÄμçÑ1Öμ￡¬ò2êÇ×îÏè½øDDAD×a»»μÄí¨μà
//í¨μà9êÇ¿a·￠°åéÏμÄμçÑ1Öμ￡¬ò2êÇμú¶t′Î2aμ½μÄμçÑ1Öμ
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_55Cycles5);

/* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE);

/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);

/*¸′Î»D￡×¼¼Ä′æÆ÷ */
ADC_ResetCalibration(ADC1);
/*μè′yD￡×¼¼Ä′æÆ÷¸′Î»íê3é */
while(ADC_GetResetCalibrationStatus(ADC1));

/* ADCD￡×¼ */
ADC_StartCalibration(ADC1);
/* μè′yD￡×¼íê3é*/
while(ADC_GetCalibrationStatus(ADC1));

/* óéóúÃ»óD2éóÃía2¿′￥·￠￡¬ËùòÔê1óÃèí¼t′￥·￠ADC×a»» */
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}

/**
  * @brief  ADC13õê¼»ˉ
  * @param  ÎT
  * @retval ÎT
  */
void ADC1_Init(void)
{
ADC1_GPIO_Config();
ADC1_Mode_Config();
}
/*********************************************END OF FILE**********************/

#include "timer.h"
#include "led.h"
#include "usart.h"
#define M 2  //2é¼ˉí¨μàμÄ×î′óêy
int flag=0;
int vol=0 ;
int volp=0;
extern __IO uint16_t ADC_ConvertedValue[M];
//////////////////////////////////////////////////////////////////////////////////
//±¾3ìDòÖ»1©Ñ§Ï°ê1óÃ￡¬Î′¾-×÷ÕßDí¿é￡¬2»μÃóÃóúÆäËüèÎoÎóÃí¾
//ALIENTE¾«ó￠STM32¿a·￠°å
//¶¨ê±Æ÷ Çy¶ˉ′úÂë
//ÕyμãÔ-×ó@ALIENTEK
//¼¼êõÂÛì3:www.openedv.com
//DT¸ÄèÕÆú:2012/9/4
//°æ±¾￡oV1.1
//°æè¨ËùóD￡¬μá°æ±Ø¾¿¡￡
//Copyright(C) 1ãÖYêDDÇòíμç×ó¿Æ¼¼óDÏT1«Ë¾ 2009-2019
//All rights reserved
//********************************************************************************
//V1.1 20120904
//1,Ôö¼óTIM3_PWM_Initoˉêy¡￡
//2,Ôö¼óLED0_PWM_VALoê¶¨òå￡¬¿ØÖÆTIM3_CH2Âö¿í
//////////////////////////////////////////////////////////////////////////////////

//í¨óÃ¶¨ê±Æ÷3ÖD¶Ï3õê¼»ˉ
//Õaàïê±ÖóÑ¡ÔñÎaAPB1μÄ2±¶￡¬¶øAPB1Îa36M
//arr￡o×Ô¶ˉÖØ×°Öμ¡￡
//psc￡oê±ÖóÔ¤·ÖÆμêy
//Õaàïê1óÃμÄêÇ¶¨ê±Æ÷3!
void TIM3_Int_Init(u16 arr,u16 psc)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //ê±Öóê1Äü

TIM_TimeBaseStructure.TIM_Period = arr; //éèÖÃÔúÏÂò»¸ö¸üDÂêÂ¼t×°èë»î¶ˉμÄ×Ô¶ˉÖØ×°ÔØ¼Ä′æÆ÷ÖüÆúμÄÖμ    ¼Æêyμ½5000Îa500ms
TIM_TimeBaseStructure.TIM_Prescaler =psc; //éèÖÃóÃà′×÷ÎaTIMxê±ÖóÆμÂê3yêyμÄÔ¤·ÖÆμÖμ  10KhzμÄ¼ÆêyÆμÂê
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //éèÖÃê±Öó·Ö¸î:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIMÏòéÏ¼ÆêyÄ￡ê½
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //¸ù¾YTIM_TimeBaseInitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉTIMxμÄê±¼ä»ùêyμ￥Î»

TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE ); //ê1ÄüÖ¸¶¨μÄTIM3ÖD¶Ï,ÔêDí¸üDÂÖD¶Ï

NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  //TIM3ÖD¶Ï
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  //ÏèÕ¼óÅÏè¼¶0¼¶
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  //′óóÅÏè¼¶3¼¶
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μà±»ê1Äü
NVIC_Init(&NVIC_InitStructure);  //¸ù¾YNVIC_InitStructÖDÖ¸¶¨μÄ2Îêy3õê¼»ˉíaéèNVIC¼Ä′æÆ÷

TIM_Cmd(TIM3, ENABLE);  //ê1ÄüTIMxíaéè

}
//¶¨ê±Æ÷3ÖD¶Ï·tÎñ3ìDò
void TIM3_IRQHandler(void) //TIM3ÖD¶Ï
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //¼ì2éÖ¸¶¨μÄTIMÖD¶Ï·￠éúóë·ñ:TIM ÖD¶ÏÔ′
{
   //Çå3yTIMxμÄÖD¶Ï′y′|àíÎ»:TIM ÖD¶ÏÔ′

TIM_ClearITPendingBit(TIM3, TIM_IT_Update  );
//LED0=!LED0;
vol=ADC_ConvertedValue[0];
volp=ADC_ConvertedValue[1];
flag=1;
}

   //DAC_SetChannel1Data(DAC_Align_12b_R, dacval);
//adcx=Get_Adc_Average(ADC_Channel_1,10);
//vol=adcx;
   // printf("%6d\n",vol);

}

#include "led.h"
#include "delay.h"
#include "key.h"
#include "sys.h"
//#include "lcd.h"
#include "usart.h"
//#include "dac.h"
#include "adc.h"
#include "timer.h"
#include "usmart.h"
#include "bsp_AdvanceTim.h"
#define M 2  //2é¼ˉí¨μàμÄ×î′óêy
//int vol;
//void Dac1_Set_Vol(u16 vol);
extern __IO uint16_t ADC_ConvertedValue[M];
long int xindian1[4],xindian2[4];//′æ·ÅμÃμ½μÄμçÑ1
int adcx0=0, adcx1=0, adcx2=0,adcx3=0;
extern int flag;
extern int flag1;
int vol1=0;
extern int vol;
extern int volp;
int dacval=0;
int dacval1=0;
int k=0,n=1,i=0;
int adccount=0;
int adccount1=0;
int adccount2=0;
int max=0,min=0,mid=0;
/************************************************
ALIENTEK¾«ó￠STM32¿a·￠°åêμÑé20
DAC êμÑé
¼¼êõÖ§3Ö￡owww.openedv.com
ìÔ±|μêÆì￡ohttp://eboard.taobao.com
1Ø×￠Î￠DÅ1«ÖúÆ½ì¨Î￠DÅoÅ￡o"ÕyμãÔ-×ó"￡¬Ãa·Ñ»ñè¡STM32×êáÏ¡￡
1ãÖYêDDÇòíμç×ó¿Æ¼¼óDÏT1«Ë¾
×÷Õß￡oÕyμãÔ-×ó @ALIENTEK
************************************************/

int main(void)
{
delay_init();            //Ñóê±oˉêy3õê¼»ˉ
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//éèÖÃÖD¶ÏóÅÏè¼¶·Ö×éÎa×é2￡o2Î»ÇàÕ¼óÅÏè¼¶￡¬2Î»Ïìó|óÅÏè¼¶
uart_init(115200);      //′®¿ú3õê¼»ˉÎa115200
//KEY_Init();    //3õê¼»ˉ°′¼ü3ìDò
LED_Init();       //LED¶Ë¿ú3õê¼»ˉ
//LCD_Init();         //LCD3õê¼»ˉ
  ADC1_Init();       //ADC3õê¼»ˉ
// Dac1_Init(); //DAC3õê¼»ˉ
ADVANCE_TIM_Init();
TIM3_Int_Init(4,71);//10KhzμÄ¼ÆêyÆμÂê￡¬¼Æêyμ½5000Îa500ms
   //TIM3_Int_Init(4999,7199);
//TIM2_PWM_Init(4999,7199);

while(1)
{

if(flag==1)
{

//DisplayCurve1(volp,vol);
if(adccount<200)
{
dacval +=vol;
dacval1 +=volp;
adccount++;
}
else
{
//dacval=dacval/200;
   dacval1=dacval1/200;
dacval=dacval/200;
DisplayCurve1(dacval1,dacval);
   adccount=0;
dacval=0;
   dacval1=0;

}
flag=0;
   }

}
}
[/mw_shl_code]    }

}
}

繁星点点starry · 发表于 2018-7-25 17:21:22

原因找到了当我改为35时就是每2us中断溢出，而我设定的是55.5+12.5共68个周期，又是双ADC那就变成136个周期了136/12M是113us肯定不对要把ADC采样时间设定的比中断溢出时间小才可以

繁星点点starry · 发表于 2018-7-25 17:28:36

改变采样频率的时候我修改的是TIM3_Int_Init(4,71) ，这个函数以前没有发现这个问题，近段时间要使用更高频率采样，发现修改TIM3_Int_Init(4,71)的参数，将71改为35，10s内得到的采样点是不变的，然而当我把71修改为143，10s内得到的采样点大概下降为一半，是我哪里设置的参数有问题吗？采样率怎么只能降不能升，希望有会的大声帮忙解答一下

正点原子 · 发表于 2018-7-26 01:41:24

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