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/********正弦波輸出表***********/

void SineWave_Data( u16 cycle ,u16 *D)

{

u16 i;

for( i=0;i<cycle;i++)

{

D[i]=(u16)((Um*sin(( 1.0*i/(cycle-1))*2*PI)+Um)*4095/3.3);

}

}

/******************正弦波形表***********************/

#ifdef  Sine_WaveOutput_Enable 

u16 SineWave_Value[256];       //用函式封裝

#endif

/******DAC暫存器地址宣告*******/  

#define DAC_DHR12R1    (u32)&(DAC->DHR12R1)   //DAC通道1輸出地址

#define DAC_DHR12R2    (u32)&(DAC->DHR12R2)   //DAC通道2輸出地址

/****************初始化引腳******************/

void SineWave_GPIO_Config(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);  //開時鐘

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;       //推輓輸出模式

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;   //輸出速率 

GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_5 ; //選擇引腳

GPIO_SetBits(GPIOA,GPIO_Pin_5)  ;   //拉高輸出

GPIO_Init(GPIOA, &GPIO_InitStructure);      //初始化

}

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/******************DAC初始化¯*************************/

void SineWave_DAC_Config( void)

{

DAC_InitTypeDef            DAC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);//開DAC時鐘

/**************DAC結構初始化*******************/

DAC_StructInit(&DAC_InitStructure);    

DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;//不產生波形

DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable; //不使能輸出快取

DAC_InitStructure.DAC_Trigger = DAC_Trigger_T2_TRGO;//DAC觸發為定時器2觸發

DAC_Init(DAC_Channel_1, &DAC_InitStructure);//初始化

DAC_Cmd(DAC_Channel_1, ENABLE);    //使能DAC的通道1

DAC_DMACmd(DAC_Channel_1, ENABLE); //使能DAC通道1的DMA  

}

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/*********定時器初始化************/

void SineWave_TIM_Config(u32 Wave1_Fre)

{

TIM_TimeBaseInitTypeDef    TIM_TimeBaseStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);//開時鐘

TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);

TIM_TimeBaseStructure.TIM_Prescaler = 0x0;     //不預分頻

TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; //不分頻<br>　　TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上計數

TIM_TimeBaseStructure.TIM_Period = Wave1_Fre;//設定輸出頻率

TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);//設定TIME輸出觸發為更新模式

}

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/*********DMA配置***********/

void SineWave_DMA_Config(void)

{                  

DMA_InitTypeDef            DMA_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);//開啟DMA2時鐘

DMA_StructInit( &DMA_InitStructure);        //DMA結構體初始化

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;//從暫存器讀資料

DMA_InitStructure.DMA_BufferSize = 256;//暫存器大小

DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外設地址不遞增

DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //記憶體地址遞增

DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//寬度為半字

DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//寬度為半字

DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;/優先順序非常高

DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;//關閉記憶體到記憶體模式

DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//迴圈傳送模式

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void SineWave_Init(u16 Wave1_Fre)

{

　　u16 f1=(u16)(72000000/sizeof(SineWave_Value)*2/Wave1_Fre);//計算頻率

　SineWave_Data( 256 ,SineWave_Value);     //生成輸出正弦波的波形表

　　SineWave_GPIO_Config();             //初始化io

　　SineWave_TIM_Config(f1);            //初始化定時器

　　SineWave_DAC_Config();              //配置DAC

　　SineWave_DMA_Config();              //配置DMA

　　TIM_Cmd(TIM2, ENABLE);             //開啟定時器

}