Stm32 based PWM output breathing lamp (including stm32 breathing light code)

Pmm breathing lamp based on stm32

A timer is used to control the I/O port output PWM waveform, thereby driving the LED lamp to appear similar to the respiratory frequency.

Hardware circuit diagram:

My harvest:

This is a description of the re-imaging of the TIM3 general-purpose timer multiplexing function in the STM32 data sheet. Assuming that PA6 is used as the PWM output, it can be seen from the figure that PA6 corresponds to channel 1 of TIM3.

The function to enable TIM3 channel 1 is

TIM_OC1Init();1

Similarly, if you want to enable PA7, which corresponds to channel 2 of TIM3, then the function that enables channel 2 is:

TIM_OC2Init()1

By analogy, it should be noted that the function of enabling different channels of different timers is slightly different, preventing the TIM_OC1Init() function from being called in the program to enable the occurrence of TIM3 channel 2.

Note here, assuming that channel 1 of TIM3 is used, then it is written here.

TIM3-》CCR11

Similarly, if you use channel 2 of the TIM3 timer, you should change it accordingly.

TIM3-》CCR21

This is also to prevent the original plan to use the channel 1 of the TIM3. Instead, it is written here as a TIM-"CCR2. This kind of error is generally hidden and not easy to find.

The corresponding program has been uploaded, but I don't know why I can't display the download address of the program here. I need to download it and go to my resource to download it.

Project file is

Progect–”RVMDK(uv4)–”iSO_STM32

STM32PWM output realizes the LED light fade-out program:

/* * Description:

*PA0: KEY1; PA1: KEY2;

*PA2: LED1; PA3: LED2;

*PA9: USART1_TX; PA10: USART1_RX

*/

#include "stm32f10x.h"

#include "stm32f10x_rcc.h"

#include "stm32f10x_gpio.h"

#include "stm32f10x_tim.h"

#include "stm32f10x_pwr.h"

#include "stm32f10x_exti.h"

#include "system_stm32f10x.h"

#include "misc.h"

Void RCC_Configuration(void);

Void GPIO_Configuration(void);

Void TIM2_Configuration(void);

Void delay_ms(u16 time);

Int main()

{

U8 led_fx=1;

U16 led_dt=0;

RCC_Configuration();

GPIO_Configuration();

TIM2_Configuration();

While(1)

{

Delay_ms(10);

If(led_fx==1)

{

Led_dt++;

}else{

Led_dt--;

}

If(led_dt"100) led_fx=0;// can be the same as the initial value

If(led_dt==0) led_fx=1;

TIM_SetCompare3 (TIM2, led_dt); / / channel 3 no heavy image is PA2 corresponding to LED1

TIM_SetCompare4(TIM2, led_dt); / / channel 4 no heavy image is PA3 corresponding LED2

}

}

Void RCC_Configuration(void)

{

SystemInit();

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

/ / GPIO_AFIODeInit (); and the same effect below, you can view the source code proof

RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

}

Void GPIO_Configuration(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

//GPIO_PinRemapConfig(GPIO_PartialRemap2_TIM2, ENABLE); // port mapping function

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3; //GPIO_Pin_3 corresponds to channel3, the main function is changed to: TIM_SetCompare3

GPIO_InitStructure.GPIO_Speed ​​= GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_Init(GPIOA, &GPIO_InitStructure);

}

Void TIM2_Configuration(void)

{

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

TIM_OCInitTypeDef TIM_OCInitStructure;

TIM_DeInit(TIM2);

TIM_InternalClockConfig(TIM2);

/ / Timer initialization

TIM_TimeBaseStructure.TIM_Period = 100-1; / / initial value is 100, 2MHz = 2000KHz, 2MHz / 100 = 0.02MHz, all cycles T = 1 / 0.02MHz = 50us, oscilloscope display period should be 50us

TIM_TimeBaseStructure.TIM_Prescaler = 36-1; // 36 times, 72MHz/36=2MHz

TIM_TimeBaseStructure.TIM_ClockDivision = 0;

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;

TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

//PWM initialization

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

TIM_OCInitStructure.TIM_Pulse = 50; / / duty cycle value is 50, so the duty cycle is: 50 / 100 = 50%

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;

TIM_OC3Init(TIM2,&TIM_OCInitStructure);

TIM_OCInitStructure.TIM_Pulse = 20;

TIM_OC4Init(TIM2,&TIM_OCInitStructure);

//TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable);

//TIM_ARRPreloadConfig(TIM2, ENABLE);

TIM_Cmd(TIM2, ENABLE);

TIM_CtrlPWMOutputs(TIM2,ENABLE);

}

Void delay_ms(u16 time)

{

U16 i=0;

While(time--)

{

i=12000;

While(i--);

}

}

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