自己慢慢看，，，，

[mw_shl_code=c,true]#ifndef __BSP_WAVEMAKER_H

#define __BSP_WAVEMAKER_H

#include "stm32f10x.h"

#define DAC_DHR12RD_Address 0x40007420

#define DAC_DHR8R1_Address 0x40007410

#define DAC_DHR12R1_Address0x40007408

/* DMA 传输数据长度 */

enum

{

DMA_BufferSize_36 = 36,

DMA_BufferSize_50 = 50,

DMA_BufferSize_100 = 100,

};

/* 波形类型 */

enum

{

WT_RECT = 0,/* 矩形波 */

WT_SIN = 1,/* 正弦波 */

WT_TRIA = 2,/* 三角波 */

WT_SAW = 3, /* 锯齿波 */

WT_NOISE = 4, /* 噪声 */

};

/* 正弦波 */

typedef struct

{

uint32_t Frequency; //频率

uint16_t Amplitude; //幅值

}SIN_T;

/* 三角波 */

typedef struct

{

uint16_t Frequency; //频率

uint16_t Amplitude; //幅值

}TRIA_T;

/* 锯齿波 */

typedef struct

{

uint32_t Frequency; //频率

uint16_t Amplitude; //幅值

}SAW_T;

/* 矩形波 */

typedef struct

{

uint32_t Frequency; //频率

uint16_t Amplitude; //幅值

uint8_t DutyCycle; //占空比

}RECT_T;

/* 噪声 */

typedef struct

{

uint16_t Frequency; //频率

uint16_t Amplitude; //幅值

}NOISE_T;

extern SIN_T g_Sine;

extern RECT_T g_Rect;

extern SAW_T g_Saw;

extern NOISE_T g_Noise;

extern TRIA_T g_Tria;

void InitWaveMaker(void);

void SetupWaveType(uint8_t _ucType,uint32_t _ulFrequency,uint16_t _usAmplitude,

uint8_t _ucDutyCycle);

#endif[/mw_shl_code]

[mw_shl_code=c,true]#include "stm32f10x.h"

#include

#include "stdlib.h"

#include "bsp_WaveMaker.h"

#include "arm_math.h"

SIN_T g_Sine; /*正弦波*/

RECT_T g_Rect; /*矩形波*/

SAW_T g_Saw; /*锯齿波*/

NOISE_T g_Noise; /*噪声 */

TRIA_T g_Tria; /*三角波*/

uint16_t g_Wave[100];

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

*函数名: InitWaveMaker

*输 入:无

*输 出:无

*功能说明：初始化波形发生器。

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

void InitWaveMaker(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

DAC_InitTypeDef DAC_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE);

/*初始化DAC 通道1 */

DAC_InitStructure.DAC_Trigger = DAC_Trigger_T6_TRGO;

DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;

DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;

DAC_Init(DAC_Channel_1, &DAC_InitStructure);

DAC_DMACmd(DAC_Channel_1, ENABLE);

/* 配置PA4为DAC_OUT1 */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;

GPIO_Init(GPIOA, &GPIO_InitStructure);

}

/*

*********************************************************************************************************

*函 数 名: InitWaveFreq(uint32_t _usFrequency, uint8_t _ucDMABuffuerSize)

*功能说明: 用于初始化各种波形的产生

*形 参：_usFrequency 表示要产生波形的触发频率，

* _ucDMABuffuerSize 表示DMA要传输的数据数。

*返 回 值: 无

*********************************************************************************************************

*/

void InitWaveFreq(uint32_t _usFrequency, uint8_t _ucDMABuffuerSize)

{

DMA_InitTypeDef DMA_InitStructure;

/*初始化定时器*/

TIM_PrescalerConfig(TIM6, 0, TIM_PSCReloadMode_Update);

TIM_SetAutoreload(TIM6, _usFrequency);

TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update);

/*初始化DMA */

DMA_DeInit(DMA2_Channel3);

DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12R1_Address;

DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&g_Wave;

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;

DMA_InitStructure.DMA_BufferSize = _ucDMABuffuerSize;

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_Low ;

DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

DMA_Init(DMA2_Channel3, &DMA_InitStructure);

DMA_Cmd(DMA2_Channel3, ENABLE);

}

/*

*********************************************************************************************************

*函 数 名: SetupWaveType

*功能说明: 用于建立产生各种波形

*形 参：_ucType表示要产生的波形的类型

_ulFrequency表示波形的触发频率

_usAmplitude表示波形的幅值

_ucDutyCycle表示矩形波的占空比

*返 回 值: 无

*********************************************************************************************************

*/

void SetupWaveType(uint8_t _ucType,uint32_t _ulFrequency,uint16_t _usAmplitude,

uint8_t _ucDutyCycle)

{

uint8_t i;

TIM_Cmd(TIM6, DISABLE);

DAC_Cmd(DAC_Channel_1, DISABLE);

switch (_ucType)

{

case WT_RECT: /* 方波 */

InitWaveFreq(720000 / _ulFrequency, DMA_BufferSize_100); /*要先初始化这个*/

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

{

g_Wave= _usAmplitude;

}

for (i = _ucDutyCycle; i < 100; i++)

{

g_Wave= 0;

}

break;

case WT_SIN:/* 正弦波 */

InitWaveFreq(720000 / _ulFrequency,DMA_BufferSize_100);

for (i = 0; i < DMA_BufferSize_100; i++)

{

g_Wave= 1024+_usAmplitude*sin(2*3.1415926f*99*i/100);

}

break;

case WT_SAW: /* 锯齿波 */

InitWaveFreq(720000 / _ulFrequency,DMA_BufferSize_100);

for (i = 0; i < DMA_BufferSize_100; i++)

{

g_Wave= 100 + i*_usAmplitude;

}

break;

case WT_TRIA: /* 三角波*/

InitWaveFreq(720000 / _ulFrequency,DMA_BufferSize_100);

for (i = 0; i < DMA_BufferSize_100; i++)

{

g_Wave= 100 + abs(50-i)*_usAmplitude;

}

break;

case WT_NOISE: /*噪声 */

InitWaveFreq(720000 / _ulFrequency,DMA_BufferSize_100);

for (i = 0; i < DMA_BufferSize_100; i++)

{

g_Wave= rand()%_usAmplitude;

}

break;

default : break;

}

DAC_Cmd(DAC_Channel_1, ENABLE);

TIM_Cmd(TIM6, ENABLE);

}[/mw_shl_code]

[mw_shl_code=c,true]//初始化显示的波形是方波

g_Rect.Frequency = 10000; //频率

g_Rect.Amplitude = 2000; //幅值

g_Rect.DutyCycle = 50; //占空比

InitWaveMaker(); //初始化

SetupWaveType(WT_RECT,g_Rect.Frequency,g_Rect.Amplitude,g_Rect.DutyCycle); //产生波形[/mw_shl_code]