STM32 output sine wave +cubemx configuration +hal Library

Some premises ：

cubemx Inside Main frequency setting , I won't talk more about peripheral clocks and some basic configurations , There are many related online

Let's get straight to the point
I set the main frequency here 72MHz
Output Sine wave Need to use STM32 The peripherals of DAC

DAC Concept ：

A binary The discrete signal in the form of digital quantity is converted into standard quantity （ Or reference quantity ） Benchmarking Analog converter , abbreviation DAC

Sine wave output The concrete implementation of the code

DAC Configuration of

Timer 6 Set up

Use timer 6 Trigger as an interrupt , amount to Every time you enter the timer 6 Change the output once DAC Value , Last Simulate sine The change of .
keil Code part in ：

Define an array of points and storage values

#include "math.h"
#define n 1000
uint16_t DualSine12bit[n];

Generate the point function of sine wave

//num: How many points to collect in a sine wave 
//*D: Create an array to store the values of each point of the sine wave 
//U: Peak value of output voltage (0~1.5V)
//Pi:3.1415926  Define your own 
void SineWave_Data( uint16_t num,uint16_t *D,float U)
{
    
    uint16_t i;
    for( i=0;i<num;i++)
    {
    
        D[i]=(uint16_t)((U*sin(( 1.0*i/(num-1))*2*3.14159265358979)+U)*4095/3.3);
    }
}

Output

// Turn on timer 
HAL_TIM_Base_Start(&htim6);
// Output sine wave 
SineWave_Data(n,DualSine12bit,1.6);
HAL_DAC_Start_DMA(&hdac,DAC_CHANNEL_1,(uint32_t *)DualSine12bit,n,DAC_ALIGN_12B_R);

Calculation of final frequency ：
Frequency calculation ： Main frequency / Division coefficient / Count value / Take points
72000000 / 1 / 10 / 1000 / 2 = 3600HZ