/*
 *  This programmer uses AT91' System clock
 *
 *  2010 by Ricardo V. Rojas Quispe
 */

#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>

#include "./Librerias/at91sysclock.h"

//Mapeando los registro en memoria:
AT91S_PMC *clock_map(unsigned int clockbase){
    int fd;
    void *base;

    AT91S_PMC *clock;

    off_t addr = clockbase;

    if ((fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1) {
        fprintf(stderr, "Cannot open /dev/mem.\n");
        exit(EXIT_FAILURE);
    }

    //fprintf(stderr, "/dev/mem opened.\n");

    base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, addr & ~MAP_MASK);

    if (base == (void *) -1) {
        fprintf(stderr, "Cannot open /dev/mem.\n");
        exit(EXIT_FAILURE);
    }

    //fprintf(stderr, "Memory mapped at address %p.\n", base);

    clock = base + (addr & MAP_MASK);

    return clock;
}
//Habilitamos el clock de ADC
void enable_clock_adc(AT91S_PMC * clock){
    clock->PMC_PCER=0x20;
}
//Leemos el registro de estado de clock para perifericos
unsigned int status_clock_adc(AT91S_PMC * clock){
    return (clock->PMC_PCSR);
}