File content as of revision 0:82a281385638:

#include "mbed.h"

AnalogOut dac(PA_4);
Serial pc(USBTX,USBRX);
DigitalOut check(PC_2);
void Init_ADC(void);

int main() {
    Init_ADC();                                              

    while(1) {
        check=1;
        ADC1->CR2  |= 0x40000000;   // Begin sample and conversion
        float value = ADC1->DR;
        value = ADC2->DR;
        value = ADC3->DR;
        dac=ADC3->DR/4096.0f;
        check=0;
        value = ADC1->DR;
//        pc.printf("%f\n",value);
//        wait(0.025f);
    }   
}


void Init_ADC(void){
    // ADC Setup
     RCC->APB2ENR |= RCC_APB2ENR_ADC3EN;                        // clock for ADC3
     RCC->APB2ENR |= RCC_APB2ENR_ADC2EN;                        // clock for ADC2
     RCC->APB2ENR |= RCC_APB2ENR_ADC1EN;                        // clock for ADC1
     
     RCC->AHB1ENR |= RCC_AHB1ENR_GPIOCEN;                        // Enable clock for GPIOC
     RCC->AHB1ENR |= RCC_AHB1ENR_GPIOBEN;                        // Enable clock for GPIOA
    
     ADC->CCR = 0x00000016;                                     // Regular simultaneous mode only
     ADC1->CR2 |= ADC_CR2_ADON;//0x00000001;                    // ADC1 ON
     ADC1->SQR3 = 0x0000000E;                    //channel      // use PC_4 as input- ADC1_IN14
     ADC2->CR2 |= ADC_CR2_ADON;//0x00000001;                    // ADC2 ON
     ADC2->SQR3 = 0x00000008;                                   // use PB_0 as input - ADC2_IN8
     ADC3->CR2 |= ADC_CR2_ADON;                                 // ADC3 ON
     ADC3->SQR3 = 0x0000000B;                                   // use PC_1, - ADC3_IN11
     GPIOC->MODER |= 0b1100001100;             //each channel   // PC_4, PC_1 are analog inputs 
     GPIOB->MODER |= 0x3;                                       // PB_0 as analog input
     
     ADC1->SMPR1 |= 0x1000;                        //??         // 15 cycles on CH_14, 0b 001000000000000
     ADC2->SMPR1 |= 0x1000000;                                  // 15 cycles on CH_8, 2^24 = 16^6
     ADC3->SMPR2 |= 0b1000;                                        // 15 cycles on CH_11, 0b 001000;

    }