STM32使用DAC输出五个周期的1MHz正弦波
时间: 2024-05-08 21:16:29 浏览: 116
以下是使用STM32的DAC输出五个周期的1MHz正弦波的代码示例:
```c
#include "stm32f4xx.h"
#define PI 3.14159265358979323846
void DAC1_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
DAC_InitTypeDef DAC_InitStruct;
// Enable GPIOA clock
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
// Enable DAC clock
RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
// Configure PA4 as analog output
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStruct);
// Initialize DAC1
DAC_InitStruct.DAC_Trigger = DAC_Trigger_None;
DAC_InitStruct.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
DAC_Init(DAC_Channel_1, &DAC_InitStruct);
DAC_Cmd(DAC_Channel_1, ENABLE);
}
void delay_us(uint32_t us)
{
uint32_t count = us * (SystemCoreClock / 1000000) / 5;
while(count--);
}
int main(void)
{
uint16_t i, j, k;
uint16_t sine_wave[100] = {2048, 2447, 2831, 3185, 3495, 3750, 3939, 4056, 4095, 4056, 3939, 3750, 3495, 3185, 2831, 2447, 2048, 1649, 1265, 912, 602, 347, 158, 41, 0, 41, 158, 347, 602, 912, 1265, 1649, 2048, 2447, 2831, 3185, 3495, 3750, 3939, 4056, 4095, 4056, 3939, 3750, 3495, 3185, 2831, 2447, 2048, 1649, 1265, 912, 602, 347, 158, 41, 0, 41, 158, 347, 602, 912, 1265, 1649, 2048, 2447, 2831, 3185, 3495, 3750, 3939, 4056, 4095, 4056, 3939, 3750, 3495, 3185, 2831, 2447, 2048, 1649, 1265, 912, 602, 347, 158, 41, 0, 41, 158, 347, 602, 912, 1265, 1649, 2048};
// Initialize system clock
SystemInit();
// Initialize DAC1
DAC1_Init();
// Output five cycles of 1MHz sine wave
for(i = 0; i < 5; i++)
{
for(j = 0; j < 100; j++)
{
DAC_SetChannel1Data(DAC_Align_12b_R, sine_wave[j]);
delay_us(1); // Delay for 1us
}
}
while(1);
}
```
该代码使用STM32的DAC输出一个100个采样点的1MHz正弦波。在主函数中,使用for循环输出五个周期的正弦波。在每个周期中,使用for循环依次输出100个采样点,并通过DAC_SetChannel1Data函数将采样点的值写入DAC1的缓存寄存器。同时,在每个采样点之间延迟1us,以控制正弦波的频率。最终,通过DAC输出正弦波。