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/**

 @file  soc.c

 @brief Supporting functions that do not warrant their own file.

*/

#include <stdint.h>

#include "soc.h"

/* Prototypes for external functions */

extern void putchar(int c);

extern int getchar(void);

/*-- Non-standard utility functions ------------------------------------------*/

/** Return time elapsed since the last HW reset in clock cycles */

unsigned ctime(void){

    unsigned cycles;

    cycles = *((volatile unsigned *)0x20000100);

    return cycles;

}

/*-- Libc replacement functions ----------------------------------------------*/

/** Write string to console; replacement for standard puts.

    Uses no buffering. */

int puts(const char *string){

    while(*string){

        /* Implicit CR with every NL if requested */

        if(IMPLICIT_CR_WITH_NL & (*string == '\n')){

            putchar('\r');

        }

        putchar(*string++);

    }

    /* A newline character is appended to the output. */

    if(IMPLICIT_CR_WITH_NL & (*string == '\n')){

        putchar('\r');

    }

    putchar('\n');

    return 0; /* on success return anything non-negative */

}

/** Read string from console, blocking; replacement for standard puts.

    Uses no buffering. */

char *gets (char *str){

    uint32_t i=0;

    char c;

    while(1){

        c = getchar();

        if(c=='\0'){

            break;

        }

        else if(c=='\n' || c=='\r'){

            break;

        }

        else{

            str[i++] = c;

        }

    }

    str[i] = '\0';

    return str;

}