STM32 DAC_DMA_1K正弦波DAC输出波形源码 -

#include "led.h"
#include "delay.h"
#include "key.h"
#include "sys.h"
#include "lcd.h"
#include "usart.h"
#include "math.h"
#include "dma.h"
#include "dac.h"
#include "timer.h"
#define DAC_SIN_SIZE 100 //发送数据长度,最好等于sizeof(TEXT_TO_SEND)+2的整数倍.
u16 DAC_SIN_BUF[DAC_SIN_SIZE]; //发送数据缓冲区
#define PI 3.1415962
//产生正弦波函序列，根据DAC_SIN_SIZE生成。
void dac_creat_sin_buf(void)
{
u8 i;
float inc=2*PI/DAC_SIN_SIZE; //计算增量（一个周期DAC_SIN_BUF个点）
float outdata=0;
for(i=0;i<DAC_SIN_SIZE;i++)
{
outdata=2047*(1+sin(inc*i)); //计算以dots个点为周期的每个点的值，放大2048倍，并偏移到正数区域。
printf("%f\r\n",outdata);
DAC_SIN_BUF[i]=outdata;
}
}
int main(void)
{
u8 i=0;
delay_init(); //延时函数初始化
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//设置中断优先级分组为组2：2位抢占优先级，2位响应优先级
uart_init(115200); //串口初始化为115200
LED_Init(); //初始化与LED连接的硬件接口
LCD_Init(); //初始化LCD
KEY_Init(); //按键初始化
TIM3_Int_Init(9,71);
dac_creat_sin_buf();
Dac1_Init();
DAC_DMA_Config(DMA1_Channel3,(u32)&DAC->DHR12R1,(u32)DAC_SIN_BUF,DAC_SIN_SIZE);//DMA1通道4,外设为串口1,存储器为SendBuff,长度SEND_BUF_SIZE.
TIM3->DIER|=1<<8;
MYDMA_Enable(DMA1_Channel3);
POINT_COLOR=RED;//设置字体为红色
LCD_ShowString(30,50,200,16,16,"WarShip STM32");
LCD_ShowString(30,70,200,16,16,"DMA TEST");
LCD_ShowString(30,90,200,16,16,"ATOM@ALIENTEK");
LCD_ShowString(30,110,200,16,16,"2015/1/15");
LCD_ShowString(30,130,200,16,16,"KEY0:Start");
POINT_COLOR=BLUE;//设置字体为蓝色
while(1)
{
i++;
delay_ms(10);
if(i==20)
{
LED0=!LED0;//提示系统正在运行
i=0;
}
}
}

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