Thread: ADC Conversion to Voltage Value

Good Morning, I am currently programming a ARM Nucleo board to read a ADC value and convert the value to decimal.

I am using a 12 bit ADC which is then (hopefully) being converted into a float for me to eventually output. However this conversion does not seem to be working very well.

Code:

#include <stm32f4xx.h>
#include "PLL_Config.c"
#include "ADC.h"
#include "DAC.h"
#include "lcd.h"




unsigned short ADC_DATA;
int main(void)

{
    PLL_Config();
    SystemCoreClockUpdate();
    
    
    initLCD();


    
    init_ADC();        //config ADC
    init_DAC();        //config DAC
    
    
    while (1){


        ADC_DATA=read_adc();            //read value from ADC
        output_dac(ADC_DATA);    //send straight to DAC (DAC pin should replicate ADC pin)    
        lcd_delayus(200000);
    }
    
}
void init_ADC(void)
{
    RCC->AHB1ENR|=RCC_AHB1ENR_GPIOCEN;    //GPIOC clock enable
    ADC_input_port->MODER|=(3u<<(2*ADC_input_pin));    //ADC input pin is analogue mode
    
    RCC->APB2ENR|=RCC_APB2ENR_ADC1EN;        //ADC clock enable
    ADC1->SQR1&=~ADC_SQR1_L;                        //set number of conversions per sequence to 1
    ADC1->SQR3&=~ADC_SQR3_SQ1;                    //clear channel select bits
    ADC1->SQR3|=ADC_Channel;                        //set channel
    ADC1->CR2|=ADC_CR2_ADON;                        //enable ADC
    
}




unsigned short read_adc(void)
{
    ADC1->CR2|=ADC_CR2_SWSTART;                //start ADC conversion
    while((ADC1->SR&ADC_SR_EOC)==0){__NOP();}    //wait for ADC conversion complete
    return ADC1->DR;                                    //return converted value
}