STM32利用DAC+DMA+TIMER 输出正弦波

使用的是STM32F407的板子，程序参考的是STM32F4xx固件库的DAC_SignalsGeneration文件夹下的程序。官方例程分别使用了DAC的禁止生成波（DAC_WaveGeneration_None）的Escalator Wave梯形波,Sine Wave正弦波和stm32内置的的Noise Wave(DAC_WaveGeneration_Noise)，Triangle Wave(DAC_WaveGeneration_Triangle) 。
下面主要说一下输出正弦波的配置。

正弦电压的数组
const uint16_t aSine12bit[32] = {
2047, 2447, 2831, 3185, 3498, 3750, 3939, 4056, 4095, 4056,
3939, 3750, 3495, 3185, 2831, 2447, 2047, 1647, 1263, 909,
599, 344, 155, 38, 0, 38, 155, 344, 599, 909, 1263, 1647};
把以上数组用matlab画出后，如下图所示：
下面是配置DAC通道2的程序，开DMA,设置TIMER6触发DAC
void DAC_Ch2_SineWaveConfig(void)
{
DMA_InitTypeDef DMA_InitStructure;
DAC_InitTypeDefDAC_InitStructure;
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_2, &DAC_InitStructure);

DMA_DeInit(DMA1_Stream6);
DMA_InitStructure.DMA_Channel = DMA_Channel_7;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)DAC_DHR12R2_ADDRESS;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&aSine12bit;
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_InitStructure.DMA_BufferSize = 32;
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_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA1_Stream6, &DMA_InitStructure);

DMA_Cmd(DMA1_Stream6, ENABLE);

DAC_Cmd(DAC_Channel_2, ENABLE);

DAC_DMACmd(DAC_Channel_2, ENABLE);
}
下面是定时器6的配置程序
定时器更新频率是84M/(0xFF+1)=328KHZ
void TIM6_Config(void)
{
TIM_TimeBaseInitTypeDefTIM_TimeBaseStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE);

TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 0xFF;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM6, &TIM_TimeBaseStructure);

TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update);

TIM_Cmd(TIM6, ENABLE);
}
因为我们的正弦波形是由32个点构成，所以输出的正弦波形的频率是328K/32=10.25K
用示波器验证，如下图所示
【STM32利用DAC+DMA+TIMER 输出正弦波】

STM32利用DAC+DMA+TIMER 输出正弦波

推荐阅读

蛋黄果怎么吃图解?蛋黄果的吃法蛋黄果怎么吃

鱼腥草怎么吃能去腥

形容心平气和的格言

吉林省普通高等学校招生填报志愿平台

92号汽油一吨多少升

芜城是哪个城市的别称芜城是哪个城市

预防阴道炎不要常泡澡

荣耀20后台怎么设置

微信注销了警察能查到转账记录吗

新西兰一日游在哪报名

蟾蜍饲养管理技术要点饲养蟾蜍如何办手续

这些食物可以帮助胎儿骨骼发育，孕妈你吃了吗？

孕妇怀双胞胎的症状

胎芽3mm宝宝多少周

肺热咳嗽黄痰怎么调理？

小偷在网上秀偷盗的东西是种什么心态

揭阳自考成绩转出广东省有什么规定揭阳自考网上报考

韵达快递在哪拿

白带很稠是怎么回事了呢？

锻炼身体酸痛怎么办？