原子哥，下面是一个用DMA+DAC生成正弦波的程序，为什么程序一生成不了正弦波，而程序二却可以生成。。。

南方的狼

原子哥，下面是一个用DMA+DAC生成正弦波的程序，为什么程序一生成不了正弦波，而程序二可以生成，他们的不同只在以红色标注的部分（注释掉还是没注释掉的问题），请原子哥帮我看一下，谢谢！
程序一：
#include "stm32f10x.h"
#define DAC_DHR12RD_Address   0x40007420

//DAC_InitTypeDef            DAC_InitStructure;
//DMA_InitTypeDef            DMA_InitStructure;
//TIM_TimeBaseInitTypeDef    TIM_TimeBaseStructure;

const uint16_t Sine12bit[32] = {2047, 2447, 2831, 3185, 3498, 3750, 3939, 4056, 4095, 4056,
                      3939, 3750, 3495, 3185, 2831, 2447, 2047, 1647, 1263, 909, 
                      599, 344, 155, 38, 0, 38, 155, 344, 599, 909, 1263, 1647};

uint32_t DualSine12bit[32];
uint8_t Idx = 0;

void RCC1_Configuration(void)
{   
  SystemInit();
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);
}

void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_4 | GPIO_Pin_5;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void Timer8_Configuration(void)
 {
  TIM_TimeBaseInitTypeDef    TIM_TimeBaseStructure;
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure); 
  TIM_TimeBaseStructure.TIM_Period =0x19;          
  TIM_TimeBaseStructure.TIM_Prescaler = 0x0;       
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;    
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
  TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);
  TIM_SelectOutputTrigger(TIM8, TIM_TRGOSource_Update);
  TIM_Cmd(TIM8, ENABLE);
}

void DAC_Configuration(void)
{
  DAC_InitTypeDef            DAC_InitStructure;
  DAC_InitStructure.DAC_Trigger = DAC_Trigger_T8_TRGO;
  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;
  DAC_Init(DAC_Channel_1, &DAC_InitStructure);
  DAC_Init(DAC_Channel_2, &DAC_InitStructure);
  DAC_Cmd(DAC_Channel_1, ENABLE);
  DAC_Cmd(DAC_Channel_2, ENABLE);
  DAC_DMACmd(DAC_Channel_2, ENABLE);
}

void DMA_Configuration(void)
{
  DMA_InitTypeDef            DMA_InitStructure;
  DMA_DeInit(DMA2_Channel4);
  DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12RD_Address;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&DualSine12bit;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  DMA_InitStructure.DMA_BufferSize = 32;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA2_Channel4, &DMA_InitStructure);
  DMA_Cmd(DMA2_Channel4, ENABLE);
}

int main(void)
{
  RCC1_Configuration();
  GPIO_Configuration();
  Timer8_Configuration();
  DAC_Configuration() ;
  DMA_Configuration();
  for (Idx= 0; Idx<32; Idx++)
  {
    DualSine12bit[Idx] = (Sine12bit[Idx] << 16) + (Sine12bit[Idx]);
  }
   while(1)
 {
 }
}
程序二：
#include "stm32f10x.h"
#define DAC_DHR12RD_Address   0x40007420

DAC_InitTypeDef            DAC_InitStructure;
DMA_InitTypeDef            DMA_InitStructure;
TIM_TimeBaseInitTypeDef    TIM_TimeBaseStructure;

const uint16_t Sine12bit[32] = {2047, 2447, 2831, 3185, 3498, 3750, 3939, 4056, 4095, 4056,
                      3939, 3750, 3495, 3185, 2831, 2447, 2047, 1647, 1263, 909, 
                      599, 344, 155, 38, 0, 38, 155, 344, 599, 909, 1263, 1647};

uint32_t DualSine12bit[32];
uint8_t Idx = 0;

void RCC1_Configuration(void)
{   
  SystemInit();
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);
}

void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_4 | GPIO_Pin_5;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void Timer8_Configuration(void)
 {
//  TIM_TimeBaseInitTypeDef    TIM_TimeBaseStructure;
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure); 
  TIM_TimeBaseStructure.TIM_Period =0x19;          
  TIM_TimeBaseStructure.TIM_Prescaler = 0x0;       
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;    
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
  TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);
  TIM_SelectOutputTrigger(TIM8, TIM_TRGOSource_Update);
  TIM_Cmd(TIM8, ENABLE);
}

void DAC_Configuration(void)
{
//  DAC_InitTypeDef            DAC_InitStructure;
  DAC_InitStructure.DAC_Trigger = DAC_Trigger_T8_TRGO;
  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;
  DAC_Init(DAC_Channel_1, &DAC_InitStructure);
  DAC_Init(DAC_Channel_2, &DAC_InitStructure);
  DAC_Cmd(DAC_Channel_1, ENABLE);
  DAC_Cmd(DAC_Channel_2, ENABLE);
  DAC_DMACmd(DAC_Channel_2, ENABLE);
}

void DMA_Configuration(void)
{
//  DMA_InitTypeDef            DMA_InitStructure;
  DMA_DeInit(DMA2_Channel4);
  DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12RD_Address;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&DualSine12bit;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  DMA_InitStructure.DMA_BufferSize = 32;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA2_Channel4, &DMA_InitStructure);
  DMA_Cmd(DMA2_Channel4, ENABLE);
}

int main(void)
{
  RCC1_Configuration();
  GPIO_Configuration();
  Timer8_Configuration();
  DAC_Configuration() ;
  DMA_Configuration();
  for (Idx= 0; Idx<32; Idx++)
  {
    DualSine12bit[Idx] = (Sine12bit[Idx] << 16) + (Sine12bit[Idx]);
  }
   while(1)
 {
 }
}

正点原子

程序二的设置之间可以共用结构体数据,而程序一,每次都是重新设置.但是有些该设置的地方,你没去设置了.
所以程序二可以,二程序一不行.

南方的狼

回复【2楼】正点原子:
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但是我所有的程序都附上了，并没有需要再设置的地方了。？？？

physics

回复【2楼】正点原子:
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但是程序二在MAIN里面只调用函数的话，三个结构体初始化都没有被调用

正点原子

回复【4楼】physics:
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你可以自己测试,然后对比寄存器值,就知道为什么了.