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標題: STM32 PWM程序 [打印本頁]

作者: sxz111 時間: 2021-3-16 19:02
標題: STM32 PWM程序
#include "sys.h"
#include "delay.h"
#include "usart.h"
#include "led.h"
#include "pwm.h"

int main(void)
{
u16 led0pwmval=0;
u8 dir=1;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//設置系統中斷優先級分組2
delay_init(168);  //初始化延時函數
uart_init(115200);//初始化串口波特率為115200
//pwm_int_TIM2(9999,143);       //======初始化pwm輸出 72000 000 /7199+1=10000
  //TIM3_PWM_Init(9999,143); //84M/84=1Mhz的計數頻率,重裝載值500，所以PWM頻率為 1M/500=2Khz.
pwm_int_TIM1(7199); //84M/84=1Mhz的計數頻率,重裝載值500，所以PWM頻率為 1M/500=2Khz.
// pwm_int_TIM3(7199,0);
while(1) //實現比較值從0-300遞增，到300后從300-0遞減，循環
{
delay_ms(10);
  //if(dir)led0pwmval++;//dir==1 led0pwmval遞增
  //else led0pwmval--; //dir==0 led0pwmval遞減
//if(led0pwmval>300)dir=0;//led0pwmval到達300后，方向為遞減
  //if(led0pwmval==0)dir=1; //led0pwmval遞減到0后，方向改為遞增

  TIM_SetCompare1(TIM3,710); //修改比較值，修改占空比
  TIM_SetCompare1(TIM2,710); //設置TIM2通道2的占空比  pwm1/7200 PA1
  TIM_SetCompare2(TIM2,710); //設置TIM2通道2的占空比  pwm1/7200 PA1
  TIM_SetCompare3(TIM2,710); //設置TIM2通道2的占空比  pwm1/7200 PA1
  TIM_SetCompare4(TIM2,710); //設置TIM2通道2的占空比  pwm1/7200 PA1
  TIM_SetCompare1(TIM3,2220);
  TIM_SetCompare2(TIM3,2220);
  TIM_SetCompare3(TIM3,2220);
  TIM_SetCompare4(TIM3,2220);
  TIM_SetCompare1(TIM1,710); //設置TIM2通道2的占空比  pwm1/7200 PA1
  TIM_SetCompare2(TIM1,710); //設置TIM2通道2的占空比  pwm1/7200 PA1
  TIM_SetCompare3(TIM1,710); //設置TIM2通道2的占空比  pwm1/7200 PA1
  TIM_SetCompare4(TIM1,710); //設置TIM2通道2的占空比  pwm1/7200 PA1
  //delay_ms(1000);
  //TIM_SetCompare1(TIM2,0); //設置TIM2通道2的占空比  pwm1/7200 PA1
  /*TIM_SetCompare1(TIM3,40); //修改比較值，修改占空比
  delay_ms(10);
  TIM_SetCompare1(TIM3,0); //修改比較值，修改占空比
  */
}

}

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