Why no effect of calling functions with void keyword?

Question

I need to write quite simple program which makes LED diode flashes using processor ARM AT91SAM9263. I need to run this code using QEMU emulator, which is installed on my Ubuntu machine. I am trying to write a program with 4 functions, which are initializing LED ports and Buttons ports, which are flashing LED diodes and checks the Buttons status (if it is pulled or not).
I have defined base registers, although I have a problem with making LED diodes to switch them on/off and to check buttons status. Simply, nothing happens. Below is my code:

#include <stdio.h>
#include "AT91SAM9263-EK.h"
#include "AT91SAM9263.h"
#include "project.h"
#include <stdint.h>
#include <stdbool.h>
#define AT91B_LED1     AT91C_PIO_PB8   /* DS1 */
#define AT91B_LED2    AT91C_PIO_PC29  /* DS2 */
#define AT91B_NB_LEB         2
#define AT91D_BASE_PIO_LED1  (AT91C_BASE_PIOB)
#define AT91D_BASE_PIO_LED2  (AT91C_BASE_PIOC)
#define AT91D_ID_PIO_LED1    (AT91C_ID_PIOB)
#define AT91D_ID_PIO_LED2    (AT91C_ID_PIOC)
#define AT91B_BP1       AT91C_PIO_PC5  // Left click#
#define AT91B_BP2       AT91C_PIO_PC4  // Right click
#define AT91D_BASE_PIO_BP    AT91C_BASE_PIOC
#define AT91D_ID_PIO_BP      AT91C_ID_PIOCDE

void LedPortInit()
{
AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_PIOCDE ); // peripheral clock enable register (port C, D, E)/* Set the PIO line as input */
AT91D_BASE_PIO_LED1->PIO_ODR = 0x0000000F;
AT91D_BASE_PIO_LED1->PIO_PER = AT91C_PIO_PB8;
AT91D_BASE_PIO_LED2->PIO_OER = AT91C_PIO_PC29 ;
AT91D_BASE_PIO_LED2->PIO_PER = 0xFFFFFFFF;// 1 – Enable PIO to control the pin
AT91C_BASE_PIOE->PIO_PER = AT91C_PIO_PB31;/* Disable pull-up */
AT91C_BASE_PIOA->PIO_PPUDR = 0xFFFF0000;
}
void ButonPortInit()
{
  AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_PIOCDE ); // peripheral clock enable register (port C, D, E)/* Set the PIO line as input */
  AT91C_BASE_PIOD->PIO_ODR = 0x0000000F;
  AT91C_BASE_PIOD->PIO_PER = AT91C_PIO_PC5;
  AT91C_BASE_PIOB->PIO_OER = AT91C_PIO_PC4 ;
  AT91C_BASE_PIOD->PIO_PER = 0xFFFFFFFF;// 1 – Enable PIO to control the pin
  AT91C_BASE_PIOE->PIO_PER = AT91C_PIO_PB31;/* Disable pull-up */
  AT91C_BASE_PIOA->PIO_PPUDR = 0xFFFF0000;
}
void LedSwitch()
{

while(1)
{
  AT91B_LED1->AT91C_PIO_PB8  ^= 1;
}
AT91C_PIO_PC29  << 29 ;

}
void ButtonTest()
{
AT91C_PIO_PC5  << 5;
AT91C_PIO_PC4  << 4;
}
int main(void)
{
LedPortInit();
void ButonPortInit();
void LedSwitch();
void ButtonTest();

}

Answer 1

I have found full solution, I just needed to activate additional registers PIO_SODR and PIO_CODR as below:

void LED1_SwitchOn(){
    *PIOB_CODR = AT91B_LED1;
}

void LED2_SwitchOn(){
    *PIOC_CODR = AT91B_LED2;
}

void LED1_SwitchOff(){
    *PIOB_SODR = AT91B_LED1;
}

void LED2_SwitchOff(){
    *PIOC_SODR = AT91B_LED2;
}

int BP1_Status(){
    return  (((*PIOC_PDSR) >> BP1 ) & 1);
}

int BP2_Status(){
    return  (((*PIOC_PDSR) >> BP2 ) & 1);
}

void delay(long long int time_delay){
    for (volatile long long int i = 0; i < 100000 * time_delay; i++);
}

int main(void) {
    LED1Port_Init();
    LED2Port_Init();
    enable_PMC();
    Button1Port_Init();
    Button2Port_Init();
  long long int time_delay=0;
    while (1)
    {

        LED1_SwitchOn();

        for (volatile long long int i = 0; i < DELAY; i++)
        {

            if (BP1_Status() == 0) //button1 switches on diode
                LED2_SwitchOn();
        delay(time_delay);
            if (BP2_Status() == 0) //button2 switches off diode
                LED2_SwitchOff();

        }

        LED1_SwitchOff();
    }


    return 0;
}