写了个AD采样程序，结果仿真时RTD_DMA_RX_BUF里边的数值一直为0，求大神解答
/*********************************************************************
* Filename: temperature_ad.c
* Dependencies: 测温模块初始化
*-----------------------------------------------------------------------
* Function List:
************************************************************************/
#include "device.h"
/*定义ADC3的数据寄存器地址，DMA功能要用到外设的数据地址
*ADC3的数据地址为外设基地址+偏移地址，基地址在RM0090 Reference
*manual（参考手册）的地址映射表里，为0x40012200，ADC_DR
*偏移地址为0x4C，故实际地址为0x40012200+0x4C = 0x4001224C */
#define ADC3_DR_Addr ((uint32_t)0x4001224C)
Uint16 RTD_RX_NO = 20;
/******************************************************************************
* 函数名: Temperature_INTT
* 功能: 初始化STM32接口
*
******************************************************************************/
void RTD_INTT(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
SCB->AIRCR = 0x05AF0000 | 0x400;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOF, &GPIO_InitStructure);
DMA_DeInit( DMA2_Stream1 );
ADC3->CR2 &= ~(1<<8);//ADC3dma 发送模式除能
// DMA_StructInit( &DMA_InitStructure); //???
DMA_InitStructure.DMA_Channel = DMA_Channel_2;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(uint32_t)ADC3_DR_Addr;;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&RTD_DMA_RX_BUF;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = RTD_RX_NO;
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_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA2_Stream1, &DMA_InitStructure);
DMA_Cmd(DMA2_Stream1, ENABLE); //使能DMA2_Stream1通道
/* DMA中断开 */
DMA_ITConfig(DMA2_Stream1, DMA_IT_TC, ENABLE);
/* DMA中断配置 */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1); //嵌套优先级分组为 1
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream1_IRQn; //嵌套通道为DMA2_Stream1_IRQn
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //抢占优先级为 1
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //响应优先级为 1
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //通道中断使能
NVIC_Init(&NVIC_InitStructure);
/* ADC中断配置 */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1); //嵌套优先级分组为 1
NVIC_InitStructure.NVIC_IRQChannel = ADC_IRQn; //嵌套通道为ADC_IRQn
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //抢占优先级为 1
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; //响应优先级为 2
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //通道中断使能
NVIC_Init(&NVIC_InitStructure);
/* 是否需要和ADE7878的中断优先级区分开，程序中的各优先级顺序
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占和响应优先级待定
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
DMA_Init(DMA2_Stream1, &DMA_InitStructure);
//DMA_Cmd(DMA2_Stream1, ENABLE);
*/
}
/*************************************************
Function: void ADC_Config(void)
Description: ADC配置函数
Input: 无
Output:无
Return:无
*************************************************/
void RTD_ADC_Config(void)
{
ADC_InitTypeDef ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC3, ENABLE);
ADC_DeInit();
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE; //扫描转换模式失能,单通道不用
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //连续转换使能
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None; //不用外部触发，软件触发转换
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //数据右对齐，低字节对齐
ADC_InitStructure.ADC_NbrOfConversion = 1; //规定了顺序进行规则转换的ADC通道的数目
ADC_Init(ADC3, &ADC_InitStructure);
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled; //失能DMA_MODE
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
ADC_RegularChannelConfig(ADC3, ADC_Channel_8, 1, ADC_SampleTime_15Cycles); //规则通道配置，1表示规则组采样顺序
//ADC_ITConfig(ADC3, ADC_IT_EOC, ENABLE); //使能ADC转换结束中断
ADC_Cmd(ADC3, ENABLE); //使能ADC3
/*********************ADC看门狗配置***************************/
/* ADC_AnalogWatchdogCmd(ADC3, ADC_AnalogWatchdog_SingleRegEnable);
ADC_AnalogWatchdogThresholdsConfig(ADC3, 0x0E8B, 0x0555); //阈值设置。高：3V 低：1V
ADC_AnalogWatchdogSingleChannelConfig(ADC3, ADC_Channel_8);
ADC_ITConfig(ADC3, ADC_IT_AWD, ENABLE);
ADC_DMACmd(ADC3, ENABLE); //使能ADC3的DMA
*/
ADC_DMARequestAfterLastTransferCmd(ADC3, ENABLE); //单通道模式下上次转换完成后DMA请求允许，也就是持续DMA
}
/*
*名称：DMA中断服务程序
*作用：ADC3_DMA数据完全完成后产生中断
*/
void DMA2_Stream1_IRQHandler (void)
{
uint32_t i,valMax, valMin, sum;
uint32_t Average = 0;
// if(DMA2->LISR & 0x00000800)
ADC_SoftwareStartConv(ADC3); //如果不是外部触发则必须软件开始转换
if (DMA_GetITStatus(DMA2_Stream1, DMA_IT_TCIF1) != RESET)
{
DMA_ClearITPendingBit(DMA2_Stream1, DMA_IT_TCIF1); // DMA2->LIFCR |= 0x00000800;
/*数据接收与处理*/
valMax = RTD_DMA_RX_BUF[0];
valMin = RTD_DMA_RX_BUF[0];
sum = RTD_DMA_RX_BUF[0];
for(i = 0; i < RTD_RX_NO; i++)
{
if (RTD_DMA_RX_BUF[i] > valMax ) valMax = RTD_DMA_RX_BUF[i];
if (RTD_DMA_RX_BUF[i] < valMin ) valMin = RTD_DMA_RX_BUF[i];
sum += RTD_DMA_RX_BUF[i];
}
sum = sum - valMax - valMin;
Average = sum/(RTD_RX_NO-2);
}
}
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