DAC (Digital to Analog Converter)

Merhaba, bu yazımda DAC (Digital to Analog Converter) (Dijital Analog Dönüştürücü) konusunu ele alacağım ve örnek kodları paylaşacağım.

Dijital Analog Çeviriciler (DAC), girişindeki sayısal değerlere karşılık analog sinyaller üretmektedir.

STM32F100RB mikrodenetleyicimizde 2 adet 12 Bitlik çözünürlüğe sahip DAC birimi bulunmaktadır.

Bu devremizde:

PA4 pinine bağlı ledimizin parlaklığını DAC kullanarak artırıp azaltacağız.

Devre Şeması

Proje Kodu

#include "stm32f10x.h"                  // Device header
#include "stm32f10x_rcc.h"              // Keil::Device:StdPeriph Drivers:RCC
#include "stm32f10x_gpio.h"             // Keil::Device:StdPeriph Drivers:GPIO
#include "stm32f10x_dac.h"              // Keil::Device:StdPeriph Drivers:DAC

void InitGPIOs(void);
void InitDAC(void);
void delay(uint32_t time);

int main(){
	InitGPIOs();
	InitDAC();
	
	while(1){
	
		for(uint16_t i = 0; i<4095; i++){
			DAC_SetChannel1Data(DAC_Align_12b_R, i);	
			delay(5000);
		}
		for(uint16_t i = 4095; i>0; i--){
			DAC_SetChannel1Data(DAC_Align_12b_R, i);	
			delay(5000);
		}
	
	}

}

void delay(uint32_t time){
	while(time--);
}

void InitGPIOs(void){
	GPIO_InitTypeDef GPIO_InitStruct;
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
	
	GPIO_InitStruct.GPIO_Mode	= GPIO_Mode_AIN;
	GPIO_InitStruct.GPIO_Pin	= GPIO_Pin_4;
	GPIO_InitStruct.GPIO_Speed	= GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStruct);
}

void InitDAC(void){
	DAC_InitTypeDef DAC_InitStruct;
	
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
	
	DAC_InitStruct.DAC_LFSRUnmask_TriangleAmplitude	= DISABLE;
	DAC_InitStruct.DAC_OutputBuffer		= DAC_OutputBuffer_Enable;
	DAC_InitStruct.DAC_Trigger			= DAC_Trigger_None;
	DAC_InitStruct.DAC_WaveGeneration	= DAC_WaveGeneration_None;
	DAC_Init(DAC_Channel_1, &DAC_InitStruct);
	
	DAC_Cmd(DAC_Channel_1, ENABLE);
}

#include "stm32f10x.h" // Device header

#include "stm32f10x_rcc.h" // Keil::Device:StdPeriph Drivers:RCC

#include "stm32f10x_gpio.h" // Keil::Device:StdPeriph Drivers:GPIO

#include "stm32f10x_dac.h" // Keil::Device:StdPeriph Drivers:DAC

void InitGPIOs(void);

void InitDAC(void);

void delay(uint32_t time);

int main(){

InitGPIOs();

InitDAC();

while(1){

for(uint16_t i = 0; i<4095; i++){

DAC_SetChannel1Data(DAC_Align_12b_R, i);

delay(5000);

}

for(uint16_t i = 4095; i>0; i--){

DAC_SetChannel1Data(DAC_Align_12b_R, i);

delay(5000);

}

void delay(uint32_t time){

while(time--);

}

void InitGPIOs(void){

GPIO_InitTypeDef GPIO_InitStruct;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AIN;

GPIO_InitStruct.GPIO_Pin = GPIO_Pin_4;

GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStruct);

}

void InitDAC(void){

DAC_InitTypeDef DAC_InitStruct;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);

DAC_InitStruct.DAC_LFSRUnmask_TriangleAmplitude = DISABLE;

DAC_InitStruct.DAC_OutputBuffer = DAC_OutputBuffer_Enable;

DAC_InitStruct.DAC_Trigger = DAC_Trigger_None;

DAC_InitStruct.DAC_WaveGeneration = DAC_WaveGeneration_None;

DAC_Init(DAC_Channel_1, &DAC_InitStruct);

DAC_Cmd(DAC_Channel_1, ENABLE);

}