stm32输出锯齿波，频率可调

#include "sawtoothwave.h" #include "delay.h" #define DAC_DHR12R1 (DAC_BASE+0x08) //外设DAC通道1的基地址 #define DAC_DHR12R2 (DAC_BASE+0x14) //外设DAC通道2的基地址 #define N1 256 #define N2 512 /********生成锯齿波形输出表***********/ void SawTooth_Data( u16 cycle ,u16 *D) { u16 i; for( i=0;i<cycle;i++) { D[i]= (u16)(1.0*i/255*4095); } } /********生成三角波形输出表***********/ void Triangle_Data( u16 cycle ,u16 *D) { u16 i; for( i=0;i<cycle/2;i++) { D[i]= (u16)(1.0*i/128*2047); } for( i=cycle/2;i<cycle;i++) { D[i]= 2047 - (u16)(1.0*i/128*2047); } } /******************三角波形表***********************/ #ifdef Triangle_WaveOutput_Enable u16 TriangleWave_Value[256]; //已用函数代替 #endif /******************锯齿波形表***********************/ #ifdef SawTooth_WaveOutput_Enable u16 SawToothWave_Value[256]; //已用函数代替 #endif /****************引脚初始化******************/ void SawtoothWave_GPIO_Config( FunctionalState NewState1 ,FunctionalState NewState2) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //开时钟 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出模式 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //输出速率 if( NewState1!=DISABLE) { GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 ; //选择引脚 GPIO_SetBits(GPIOA,GPIO_Pin_4) ; //拉高输出 } if( NewState2!=DISABLE) { GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 ; //选择引脚 GPIO_SetBits(GPIOA,GPIO_Pin_5) ; //拉高输出 } GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化 } /******************DAC初始化*************************/ void SawtoothWave_DAC_Config( FunctionalState NewState1 ,FunctionalState NewState2) { DAC_InitTypeDef DAC_InitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);//开DAC时钟 /**************DAC结构初始化，很重要，否则无波形*******************/ DAC_StructInit(&DAC_InitStructure); DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;//不产生波形 DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable; //不使能输出缓存 if( NewState1!=DISABLE) { DAC_InitStructure.DAC_Trigger = DAC_Trigger_T2_TRGO;//选择DAC触发源为TIM2 DAC_Init(DAC_Channel_1, &DAC_InitStructure);//初始化 DAC_Cmd(DAC_Channel_1, ENABLE); //使能DAC通道1 DAC_DMACmd(DAC_Channel_1, ENABLE); //使能DAC通道1的DMA } if( NewState2!=DISABLE) { DAC_InitStructure.DAC_Trigger = DAC_Trigger_T6_TRGO;//选择DAC触发源为TIM6 DAC_Init(DAC_Channel_2, &DAC_InitStructure);//初始化 DAC_Cmd(DAC_Channel_2, ENABLE); //使能DAC通道2 DAC_DMACmd(DAC_Channel_2, ENABLE); //使能DAC通道2的DMA } } /*********定时器配置************/ void SawtoothWave_TIM_Config( u32 Wave1_Fre ) { TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 | RCC_APB1Periph_TIM6, ENABLE);//开时钟 TIM_TimeBaseStructInit(&TIM_TimeBaseStructure); TIM_TimeBaseStructure.TIM_Period = Wave1_Fre; //正弦波1频率设置 TIM_TimeBaseStructure.TIM_Prescaler = 0x0; //不预分频 TIM_TimeBaseStructure.TIM_ClockDivision = 0x0; //不分频 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//向上计数模式 TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); TIM_TimeBaseStructure.TIM_Period = Wave1_Fre; //设置输出频率 TIM_TimeBaseInit(TIM6, &TIM_TimeBaseStructure); //初始化 TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);//设置TIM6输出触发为更新模式 TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update); } /*********DMA配置***********/ void SawtoothWave_DMA_Config( u16 *Wave1_Mem ,FunctionalState NewState1 ,u16 *Wave2_Mem ,FunctionalState NewState2) { DMA_InitTypeDef DMA_InitStructure; RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);//开DMA2的时钟 DMA_StructInit( &DMA_InitStructure); //DMA结构初始化 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;//从存储器读数据 DMA_InitStructure.DMA_BufferSize = sizeof(Wave1_Mem);//缓存大小 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外设地址不递增 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址递增 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//宽度为半字 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//宽度为半字 DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;//优先级：非常高 DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;//关闭内存到内存模式 DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//循环发送模式 if( NewState1!=DISABLE) { DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12R1;//外设地址为DAC通道1数据寄存器 DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)Wave1_Mem;//内存地址为输出波形数据数组 DMA_Init(DMA2_Channel3, &DMA_InitStructure);//初始化 DMA_Cmd(DMA2_Channel3, ENABLE); //使能DMA通道3 } if( NewState2!=DISABLE) { DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12R2;//设置外设地址为DAC通道1数据寄存器 DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)Wave2_Mem;//内存地址为输出波形数据数组 DMA_Init(DMA2_Channel4, &DMA_InitStructure);//初始化 DMA_Cmd(DMA2_Channel4, ENABLE); //使能DMA通道4 } } /***********锯齿波初始化***************/ void SawtoothWave_Init(u16 Wave1_Fre,FunctionalState NewState1,FunctionalState NewState2) { u16 f1=(u16)(72000000/sizeof(SawToothWave_Value)*2/Wave1_Fre); // u16 f2=(u16)(72000000/sizeof(SawToothWave_Value)*2/Wave2_Fre); SawTooth_Data( N1 ,SawToothWave_Value);//生成波形表2 SawtoothWave_GPIO_Config( ENABLE ,ENABLE); //初始化引脚 SawtoothWave_TIM_Config( f1 ); //初始化定时器 SawtoothWave_DAC_Config(NewState1 ,NewState2); //初始化DAC SawtoothWave_DMA_Config( SawToothWave_Value,NewState1,SawToothWave_Value,NewState2); //初始化DMA TIM_Cmd(TIM2, NewState1); //使能TIM2,开始产生波形 TIM_Cmd(TIM6, NewState2); //使能TIM6,开始产生波形 } /***********锯齿波初始化***************/ void TriangleWave_Init(u16 Wave2_Fre,FunctionalState NewState1,FunctionalState NewState2) { u16 f2=(u16)(72000000/sizeof(TriangleWave_Value)*2/Wave2_Fre); // u16 f2=(u16)(72000000/sizeof(SawToothWave_Value)*2/Wave2_Fre); SawTooth_Data( N1 ,TriangleWave_Value);//生成波形表2 SawtoothWave_GPIO_Config( ENABLE ,ENABLE); //初始化引脚 SawtoothWave_TIM_Config( f2 ); //初始化定时器 SawtoothWave_DAC_Config(NewState1 ,NewState2); //初始化DAC SawtoothWave_DMA_Config( TriangleWave_Value,NewState1,TriangleWave_Value,NewState2); //初始化DMA TIM_Cmd(TIM2, NewState1); //使能TIM2,开始产生波形 TIM_Cmd(TIM6, NewState2); //使能TIM6,开始产生波形 }