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/**

 @file  soc.c

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

 @bug   Any attempt to use gets() or puts() triggers a linker error (undefined

        reference to '_impure_ptr') in this file, despite the fact that this

        file does not reference those symbols; newlib's gets and puts DO, and

        the linker is somehow getting confused.

        Right now I have no idea how to sort that out.

*/

#include <stdint.h>

#include <stdio.h>

#include "soc.h"

/* Linker-defined symbols usd to access the data section */

extern char data_start [];          /**< Where .data section should be in RAM */

extern char data_load_start [];     /**< Where .data section is in ROM */

extern char data_size [];           /**< Size of .data section */

/*-- 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;

}

/** Copies .data sections (initialized data) from ROM to RAM.

   Will be called from the startup code IIF the program was linked to run

   from FLASH. */

void copy_data_sections(void){

    uint32_t i;

    /* Move data section image from flash to RAM */

    if (data_start != data_load_start){

        for(i=0;i<(uint32_t)data_size;i++){

            data_start[i] = data_load_start[i];

        }

    }

}

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

/** Write character 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 character 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;

}