[STM32 Cotex-M3 processor series programming] Timer output PWM wave-EEWORLD

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//Use the 3-channel CH3 of timer TIM4 to output a PWM wave with a duty cycle of 25%

#include "stm32f10x.h"

int main(void)

{

// SystemInit();

// Placement IO port

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE,ENABLE); //IO port enable setting

GPIO_InitTypeDef GPIO_InitStructure; //Define the structure

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8; //Connect CH3 of TIM3 to PB8 pin

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //Multiplexed push-pull output

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOB, &GPIO_InitStructure);

//Timer 2

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE); //Configure clock

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

TIM_TimeBaseStructure.TIM_Period=10000; //1s

TIM_TimeBaseStructure.TIM_Prescaler=7199; //720 division

TIM_TimeBaseStructure.TIM_ClockDivision=0;

TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //Count up

TIM_TimeBaseInit(TIM4,&TIM_TimeBaseStructure);

TIM_OCInitTypeDef TIM_OCInitStructure;

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //PWM1 mode 1

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //Comparison output enable

TIM_OCInitStructure.TIM_Pulse = 2500; //Set duty cycle

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //Output comparison polarity high

TIM_OC3Init(TIM4, & TIM_OCInitStructure); //Initialize CH3 channel of TIM4

TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable); //Enable TIM4 preload register on CH3 channel CCR3

TIM_ARRPreloadConfig(TIM4, ENABLE); //Enable TIM4 preload register on CH3 channel ARR3

TIM_Cmd(TIM4,ENABLE); //Enable timer 4

while(1);

}

//The following is the error reporting function

#ifdef USE_FULL_ASSERT

void assert_failed(uint8_t* file, uint32_t line)

{

while (1)

{

}

#endif

Keywords：STM32 Reference address：[STM32 Cotex-M3 processor series programming] Timer output PWM wave

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