PWM Generating Problem

[ali jounaki]

Posted on November 10, 2017 at 09:52

hi

i have a problem in pwm.

i want to generate a pwm signal by nucleo stm32f103rb board,i use keil for the compiling,

and i don't get the pwm.

this is my code :

&sharpinclude <stm32f10x.h>

TIM_TimeBaseInitTypeDef TIM_structure;

TIM_OCInitTypeDef pwm_structure;

void hse_config(void);

void timer_config(void);

void pwm_config(void);

void rcc_config(void);

void gpio_config(void);

int main() {

hse_config(); rcc_config(); gpio_config(); timer_config(); pwm_config(); while(1){ }}void hse_config(void) { RCC_HSEConfig(RCC_HSE_ON); RCC_WaitForHSEStartUp(); RCC_PLLConfig(RCC_PLLSource_HSE_Div1,RCC_PLLMul_9); RCC_PLLCmd(ENABLE); while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY==RESET)); RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);}

void timer_config(void) {

TIM_structure.TIM_Prescaler=71; TIM_structure.TIM_CounterMode=TIM_CounterMode_Up; TIM_structure.TIM_Period=99; TIM_structure.TIM_ClockDivision=0; TIM_structure.TIM_RepetitionCounter=0; TIM_TimeBaseInit(TIM2,&TIM_structure); }

void pwm_config(void) {

pwm_structure.TIM_OCMode=TIM_OCMode_PWM1; pwm_structure.TIM_OutputState=TIM_OutputState_Enable; pwm_structure.TIM_Pulse=48; pwm_structure.TIM_OCNPolarity=TIM_OCPolarity_High; TIM_OC2Init(TIM2,&pwm_structure); TIM_OC2PreloadConfig(TIM2,TIM_OCPreload_Enable); TIM_ARRPreloadConfig(TIM2,ENABLE); TIM_Cmd(TIM2,ENABLE); }

void rcc_config(void){

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO,ENABLE);}

void gpio_config(void){

GPIO_InitTypeDef GPIO_structure; GPIO_structure.GPIO_Pin=GPIO_Pin_3; GPIO_structure.GPIO_Mode=GPIO_Mode_AF_PP; GPIO_structure.GPIO_Speed=GPIO_Speed_50MHz; GPIO_Init(GPIOB,&GPIO_structure); GPIO_PinRemapConfig(GPIO_FullRemap_TIM2,ENABLE);}

please help me in this case.

thank you.

#pwm #nucleo-f103rb #stm32f103