stm32f103产生正弦波

要在STM32F103上输出正弦波，你需要使用DAC模块和一个正弦波表。以下是一个基本的代码框架： ```c #include "stm32f10x.h" #define DAC_DHR12R1_ADDRESS 0x40007408 const uint16_t sinewave[256] = {128,131,134,137,140,143,146,149,152,155,158,161,165,168,171,174, 177,180,183,186,189,192,195,198,201,204,207,210,213,216,218,221,224,227,230,232,235,238,240,243, 245,248,250,252,255,257,259,261,263,265,267,269,271,273,274,276,278,279,281,282,283,285,286,287, 288,289,290,291,292,293,293,294,294,295,295,295,295,295,295,295,295,295,295,295,294,294,293,293,292, 291,290,289,288,287,286,285,283,282,281,279,278,276,274,273,271,269,267,265,263,261,259,257,255, 252,250,248,245,243,240,238,235,232,230,227,224,221,218,216,213,210,207,204,201,198,195,192,189, 186,183,180,177,174,171,168,165,161,158,155,152,149,146,143,140,137,134,131,128,125,122,119,116, 113,110,107,104,101,98,95,91,88,85,82,79,76,73,70,67,64,61,58,55,52,49,46,43,40,37,35,32,29,26,23, 20,17,14,11,8,5,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20, 21,22,23,24,25,26,27,28,29,29,30,31,31,32,33,33,34,34,35,35,36,36,36,37,37,37,37,37,37,37,37,37,37,37, 36,36,36,35,35,34,34,33,33,32,31,31,30,29,29,28,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9, 8,7,6,5,4,3,2,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; int main(void) { RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE); RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); DAC_InitTypeDef DAC_InitStructure; DMA_InitTypeDef DMA_InitStructure; /* 初始化DAC通道1 */ DAC_InitStructure.DAC_Trigger = DAC_Trigger_None; DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None; DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bit0; DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable; DAC_Init(DAC_Channel_1, &DAC_InitStructure); /* 使能DAC通道1 */ DAC_Cmd(DAC_Channel_1, ENABLE); /* 初始化DMA */ DMA_DeInit(DMA1_Channel3); DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12R1_ADDRESS; DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)sinewave; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; DMA_InitStructure.DMA_BufferSize = 256; 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_M2M = DMA_M2M_Disable; DMA_Init(DMA1_Channel3, &DMA_InitStructure); /* 使能DMA */ DMA_Cmd(DMA1_Channel3, ENABLE); while (1) { } } ``` 在上面的代码中，我们使用了DAC和DMA模块。DAC模块用于将数字信号转换成模拟信号，而DMA模块用于将正弦波表中的数据传输到DAC缓存寄存器中。在主循环中，我们不需要做任何事情，因为DMA模块已经在后台运行。 需要注意的是，DAC模块和DMA模块的初始化参数可能会因具体的芯片型号而有所不同。因此，在实际编程时，你需要查阅芯片的数据手册来获得正确的参数。

要使用STM32F103记录正弦波，首先需要连接好电路。将正弦波信号输入到STM32F103的一个GPIO引脚上，同时将引脚连接到STM32F103的ADC（模数转换器）输入引脚。接下来，需要在STM32F103的代码中进行配置和编程。 首先，需要初始化ADC模块。通过操作寄存器配置ADC的通道和采样时间等参数。选择适当的通道来接收输入的正弦波信号。 然后，在代码中设置中断服务程序（ISR）来处理ADC完成转换的中断事件。当ADC转换完毕后，触发中断，并在ISR中读取已转换的数值。这些数值对应于输入正弦波的幅值。 接着，需要预设一个存储数组来保存输入的正弦波数值。每次中断触发后，在ISR中将读取的转换数值存储到数组中的某个位置。 最后，在主程序中，可以通过访问存储数组来处理和记录正弦波的数据。根据需要进行数据处理，例如绘制波形图或计算均值、最大值等统计参数。 总之，通过适当的硬件接线和STM32F103的配置和编程，可以实现对正弦波信号的记录。这样可以方便地进行波形分析和数据处理，以满足不同的应用需求。