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- #include "sign.h"
- u16 SineWave_Value[256];
- /********正弦波輸出表***********/
- //cycle :波形表的位數(shù) (0~256)
- //Um :輸出電壓的峰值(0~1.5)
- /*******************************/
- void SineWave_Data( u16 cycle ,u16 *D,float Um)
- {
- u16 i;
- for( i=0;i<cycle;i++)
- {
- D[i]=(u16)((Um*sin(( 1.0*i/(cycle-1))*2*PI)+Um)*4095/3.3);
- }
- }
- /****************初始化引腳******************/
- void SineWave_GPIO_Config(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //開時(shí)鐘
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽輸出模式
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //輸出速率
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 ; //選擇引腳
- GPIO_SetBits(GPIOA,GPIO_Pin_4) ; //拉高輸出
- GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化
- }
- /******************DAC初始化ˉ*************************/
- void SineWave_DAC_Config( void)
- {
- DAC_InitTypeDef DAC_InitStructure;
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);//開DAC時(shí)鐘
-
- /**************DAC結(jié)構(gòu)初始化*******************/
- DAC_StructInit(&DAC_InitStructure);
- DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;//不產(chǎn)生波形
- DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable; //不使能輸出緩存
- DAC_InitStructure.DAC_Trigger = DAC_Trigger_T2_TRGO;//DAC觸發(fā)為定時(shí)器2觸發(fā)
- 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
- }
- /*********定時(shí)器初始化************/
- void SineWave_TIM_Config(u32 Wave1_Fre)
- {
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);//開時(shí)鐘
- TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
- TIM_TimeBaseStructure.TIM_Prescaler = 0x0; //不預(yù)分頻
- TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; //不分頻<br> TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上計(jì)數(shù)
- TIM_TimeBaseStructure.TIM_Period = Wave1_Fre;//設(shè)置輸出頻率
- TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
- TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);//設(shè)置TIME輸出觸發(fā)為更新模式
- }
- /*********DMA配置***********/
- void SineWave_DMA_Config(void)
- {
- DMA_InitTypeDef DMA_InitStructure;
- RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);//開啟DMA2時(shí)鐘
-
- DMA_StructInit( &DMA_InitStructure); //DMA結(jié)構(gòu)體初始化
- DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;//從寄存器讀數(shù)據(jù)
- DMA_InitStructure.DMA_BufferSize = 256;//寄存器大小
- DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外設(shè)地址不遞增
- DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //內(nèi)存地址遞增
- 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(yōu)先級(jí)非常高
- DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;//關(guān)閉內(nèi)存到內(nèi)存模式
- DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//循環(huán)發(fā)送模式
-
- DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12R1;//外設(shè)地址為DAC通道1的地址
- DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SineWave_Value;//波形數(shù)據(jù)表內(nèi)存地址
- DMA_Init(DMA2_Channel3, &DMA_InitStructure);//初始化
- DMA_Cmd(DMA2_Channel3, ENABLE); //使能DMA通道3
-
- }
- /**********正弦波初始化**********************/
- //Wave1_Fre: 頻率值（0~60 000)Hz
- //Um : 電壓峰值（0.0~1.5）V
- /*******************************************/
- void SineWave_Init(u16 Wave1_Fre,float Um)
- {
- u32 f1;
- f1=(u32)(72000000/sizeof(SineWave_Value)*2/Wave1_Fre);//計(jì)算頻率
- SineWave_Data(256,SineWave_Value,Um); //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(shí)器
- SineWave_DAC_Config(); //配置DAC
- SineWave_DMA_Config(); //配置DMA
- TIM_Cmd(TIM2, ENABLE); //開啟定時(shí)器
- }
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波形發(fā)生器1.0.7z
2019-8-8 22:47 上傳
點(diǎn)擊文件名下載附件
下載積分: 黑幣 -5
184.25 KB, 下載次數(shù): 74, 下載積分: 黑幣 -5
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