STM32F103單片機輸出兩路不同頻率的正弦波源程序

ID:284202 · 發(fā)表于 2021-5-8 01:39

STM32單片機的DAC不支持直接生成正弦波，需要用讀表法生成正弦波，外加DMA傳輸，生成正弦波。代碼如下：

完整工程在附件。

單片機源程序如下:

#include "sign.h"
u16 SineWave1_Value[256];
u16 SineWave2_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 SineWave1_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);
}
}
void SineWave2_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|GPIO_Pin_5 ; //選擇引腳
GPIO_SetBits(GPIOA,GPIO_Pin_4) ; //拉高輸出
GPIO_SetBits(GPIOA,GPIO_Pin_5) ; //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);//初始化DAC的時鐘
DAC_StructInit(&DAC_InitStructure);
DAC_InitStructure.DAC_Trigger = DAC_Trigger_T2_TRGO;//指定DAC1的觸發(fā)定時器TIM2
DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;//無波形產(chǎn)生
DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable; //不是能DAC輸出緩沖
DAC_Init(DAC_Channel_1, &DAC_InitStructure);//初始化DAC channel1
DAC_InitStructure.DAC_Trigger = DAC_Trigger_T6_TRGO;//指定DAC2的觸發(fā)定時器TIM6
DAC_Init(DAC_Channel_2, &DAC_InitStructure);//初始化DAC channel2
DAC_Cmd(DAC_Channel_1, ENABLE); //使能DAC channel1
DAC_Cmd(DAC_Channel_2, ENABLE); //使能DAC channel2
DAC_DMACmd(DAC_Channel_1, ENABLE); //使能DAC Channel1的DMA
DAC_DMACmd(DAC_Channel_2, ENABLE); //使能DAC Channel2的DMA
}
/*********定時器初始化************/
void SineWave_TIM_Config(u32 Wave1_Fre,u32 Wave2_Fre)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2|RCC_APB1Periph_TIM6, ENABLE);//開時鐘
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = Wave1_Fre; //正弦波1頻率設(shè)置
TIM_TimeBaseStructure.TIM_Prescaler = 0x0; //沒有預(yù)分頻
TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; //時鐘不分頻
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//增計數(shù)
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = Wave2_Fre; //正弦波2頻率設(shè)置
TIM_TimeBaseInit(TIM6, &TIM_TimeBaseStructure);
TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);//更新TIM2輸出觸發(fā)
TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update);//更新TIM6輸出觸發(fā)
}
/*********DMA配置***********/
void SineWave_DMA_Config(void)
{
DMA_InitTypeDef DMA_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);//初始化DMA2的時鐘
DMA_DeInit(DMA2_Channel3); //將DMA配置成默認(rèn)值
DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12R1;//指定DMA2通道3的目標(biāo)地址為DAC1_DHR12R1
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SineWave1_Value;//指定DMA的源地址為數(shù)組Sine12bit
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;//外設(shè)作為數(shù)據(jù)傳輸?shù)哪康牡?br />
DMA_InitStructure.DMA_BufferSize = 256;//DMA緩沖區(qū)大小
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外設(shè)機地址存器不變
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //內(nèi)存地址寄存器遞增
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//外設(shè)數(shù)據(jù)寬度為半字
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//內(nèi)存數(shù)據(jù)寬度為半字
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//工作在循環(huán)緩存模式，數(shù)據(jù)傳輸數(shù)為0時，自動恢復(fù)配置初值
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;//非常高優(yōu)先級
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;//通道未被設(shè)置成內(nèi)存到內(nèi)存模式，與循環(huán)模式相對
DMA_Init(DMA2_Channel3, &DMA_InitStructure);//初始化DMA
DMA_DeInit(DMA2_Channel4);
DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12R2;//指定DMA2通道3的目標(biāo)地址為DAC2_DHR12R2
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SineWave2_Value;//指定DMA的源地址為數(shù)組Sine12bit
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;//外設(shè)作為數(shù)據(jù)傳輸?shù)哪康牡?br />
DMA_InitStructure.DMA_BufferSize = 256;//DMA緩沖區(qū)大小
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外設(shè)機地址存器不變
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //內(nèi)存地址寄存器遞增
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//外設(shè)數(shù)據(jù)寬度為半字
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//內(nèi)存數(shù)據(jù)寬度為半字
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//工作在循環(huán)緩存模式，數(shù)據(jù)傳輸數(shù)為0時，自動恢復(fù)配置初值
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;//通道未被設(shè)置成? 詿嫻僥詿婺Ｊ劍胙紡Ｊ較嘍?
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_Init(DMA2_Channel4, &DMA_InitStructure);
DMA_Cmd(DMA2_Channel3, ENABLE); //使能DMA的channel3
DMA_Cmd(DMA2_Channel4, ENABLE); //使能DMA的channel4　
}
/**********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,u16 Wave2_Fre,float Um)
{
u32 f1,f2;
f1=(u32)(72000000/sizeof(SineWave1_Value)*2/Wave1_Fre);//計算頻率
f2=(u32)(72000000/sizeof(SineWave2_Value)*2/Wave2_Fre);//計算頻率
SineWave1_Data(256,SineWave1_Value,Um); //生成輸出正弦波的波形表
SineWave1_Data(256,SineWave2_Value,Um); //生成輸出正弦波的波形表
SineWave_GPIO_Config(); //初始化io
SineWave_TIM_Config(f1,f2); //初始化定時器2
SineWave_DAC_Config(); //配置DAC
SineWave_DMA_Config(); //配置DMA
TIM_Cmd(TIM2, ENABLE); //開啟定時器
TIM_Cmd(TIM6, ENABLE); //開啟定時器
}