[National Technology N32G457 Review] 4. PWM and breathing light test

fxyc87

[National Technology N32G457 Review] 4. PWM and breathing light test [Copy link]

 

My related posts:

[National Technology N32G457 Review] 1. Data Preparation

[National Technology N32G457 Review] 2. Unboxing + Lighting

[National Technology N32G457 Review] III. ADC and Serial Port Function Test

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PWM initialization code

LED3 flashes at a frequency of 100HZ, with light and dark gradually changing to create a breathing effect.

void PwmInit(void)		//PWM定时器初始化	
{
	
	//开启T1时钟 + AFIO
    RCC_EnableAPB2PeriphClk(RCC_APB2_PERIPH_TIM1|RCC_APB2_PERIPH_AFIO,ENABLE);
	
	//GPIO引脚复用
	//PA8/TIM1_CH1/LED1
    GPIO_InitType gpio;
    gpio.Pin=GPIO_PIN_8;       
    gpio.GPIO_Mode=GPIO_Mode_AF_PP;
    gpio.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_InitPeripheral(GPIOA,&gpio);
	//tim1部分引脚映射
	GPIO_ConfigPinRemap(GPIO_PART1_RMP_TIM1,ENABLE);

	
	//tim1定时器相关
	//144M/14400=10KHZ  / 10000 =1HZ
	//	/100=100hz
	TIM_TimeBaseInitType tim_base;
    tim_base.Prescaler = 14400;
    tim_base.CntMode   = TIM_CNT_MODE_UP;
    tim_base.Period    = 100;
    tim_base.ClkDiv    = 0;//TIM_CLK_DIV4;
    tim_base.RepetCnt  = 0;	
	TIM_InitTimeBase(TIM1, &tim_base);
	
	OCInitType tim;	
    tim.OcMode       = TIM_OCMODE_PWM1;
    tim.OutputState  = TIM_OUTPUT_STATE_ENABLE;
    tim.OutputNState = TIM_OUTPUT_NSTATE_ENABLE;
    tim.Pulse        = 5000;		//占空比
    tim.OcPolarity   = TIM_OC_POLARITY_LOW;
    tim.OcNPolarity  = TIM_OCN_POLARITY_HIGH;
    tim.OcIdleState  = TIM_OC_IDLE_STATE_SET;
    tim.OcNIdleState = TIM_OC_IDLE_STATE_RESET;
	
	TIM_InitOc1(TIM1,&tim);
	
	TIM_Enable(TIM1,ENABLE);
	
	TIM_EnableCtrlPwmOutputs(TIM1,ENABLE);
	
}

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Main running code, calling this function once every 10ms, looping once every 1 second

void Task2(void){		//呼吸灯	10ms
	static uint16_t count=0;
	static int dir=0;
	
	TIM_SetCmp1(TIM1,count);
	if(dir==0){
		count++;
		if(count>100){
			dir=!dir;
		}
	}else{
		count--;
		if(count>65000){
			count=0;
			dir=!dir;
		}		
	}
}

Related references

#include "n32g45x.h"
#include "n32g45x_gpio.h"
#include "bsp.h"
#include <n32g45x_tim.h>

Disclaimer: All my posts are original and hand-typed by me, not something that can be done by just downloading a DEMO and running it.

Video effects:

Upload on the second floor

fxyc87

Operation effect

I am preparing to go back to my hometown, and will review the rest after the New Year.

lugl4313820

fxyc87 posted on 2022-1-25 12:16 Running effect I am preparing to go back to my hometown, and the rest will be evaluated after the new year.

Sure, you can bring it back to your hometown!

annysky2012

It is better to test it after the New Year. Going home to spend time with your family is the right thing to do.

soso

I appreciate the serious attitude of the host:)

soso

Happy New Year~~

fxyc87

soso posted on 2022-1-26 11:45 Happy New Year~~

Thanks.

se7ens

Breathing light is good

I have used both op amps and 555.

I think PWM might work better.

fxyc87

se7ens posted on 2022-1-27 13:54 The breathing light is good. I have used op amps and 555 to adjust it. I feel that PWM may have a better effect

It is PWM. The PWM duty cycle is modified every 10mS.