Stm32f0 Discovery Board PWM driver

  Bu yazım da Stm32f0 Discovery Board da gene ücretsiz bir yazılım olan CoCoox ide ile  PWM sürmeyi deneyeceğim.Gösterge olarak boarddaki  ledleri kullanacağız.

Main Dosya içeriği :

#include "stm32f0xx.h"
#include "stm32f0xx_gpio.h"
#include "stm32f0xx_rcc.h"
#include "stm32f0xx_tim.h"
#include "pwm.h"


int main(void)
{

TIM_Config();
PWM_Init(15625);
PWM_Cmd(ENABLE);
PWM_ConfigChannel(0,5);
PWM_ConfigChannel(1,95);

    while(1)
    {


    }

}


PWM.H  Dosya içeriği :

#ifndef __PWM_H__
#define __PWM_H__
#include "stm32f0xx.h"
#include "stm32f0xx_conf.h"
#include "stm32f0xx_rcc.h"
#include "stm32f0xx_gpio.h"
#include "stm32f0xx_tim.h"

#ifdef __cplusplus
extern "C"
{
#endif

void TIM_Config(void);
void PWM_Init(uint32_t Frecuency);
void PWM_ConfigChannel(uint32_t Channel, uint32_t DutyCycle);
void PWM_Cmd(FunctionalState NewState);

#ifdef __cplusplus
}
#endif

#endif // __PWM_H__

PWM.C Dosya içeriği:

#include "pwm.h"

static uint32_t TimerPeriod;

void TIM_Config(void)

{

 GPIO_InitTypeDef GPIO_InitStructure;

   /* GPIOC Clocks enable */

   RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOC, ENABLE);

   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;

   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_3;

   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

   GPIO_Init(GPIOC, &GPIO_InitStructure);

   GPIO_PinAFConfig(GPIOC, GPIO_PinSource8, GPIO_AF_0);

   GPIO_PinAFConfig(GPIOC, GPIO_PinSource9, GPIO_AF_0);

}

void PWM_Init(uint32_t Frequency)

{

Frequency/=2;

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

TIM_Config();

TimerPeriod = (SystemCoreClock / Frequency ) - 1;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3 , ENABLE);

TIM_TimeBaseStructure.TIM_Period = TimerPeriod;

TIM_TimeBaseStructure.TIM_Prescaler = 0;

TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

TIM_TimeBaseStructure.TIM_ClockDivision = 0;

TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;

TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

}

void PWM_ConfigChannel(uint32_t Channel, uint32_t DutyCycle)

{

TIM_OCInitTypeDef TIM_OCInitStructure;

uint32_t ChannelPulse = 0;

DutyCycle=100-DutyCycle ;

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;

TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;

TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;

TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;

ChannelPulse = (uint16_t) ((DutyCycle * 10 *(TimerPeriod - 1)) / 1000);

TIM_OCInitStructure.TIM_Pulse = ChannelPulse;

if(Channel == 0){

TIM_OC3Init(TIM3, &TIM_OCInitStructure);

}else if(Channel == 1){

TIM_OC4Init(TIM3, &TIM_OCInitStructure);

 }

}

void PWM_Cmd(FunctionalState NewState)

{

TIM_Cmd(TIM3, NewState);

}