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#include "bios_funs.h"

#include <inttypes.h>

#include <avr/interrupt.h>

#include <avr/pgmspace.h>

#include <avr/io.h>

#include <stdio.h>

//---------------------------------------------------------------------------

// Function definitions for the exported interface

int bios_putchar(char c, FILE *stream) {

    loop_until_bit_is_set(UCSRA, UDRE);

    UDR = c;

    return 0;

};

int bios_getchar(FILE *stream) {

    loop_until_bit_is_set(UCSRA, RXC);

    return UDR;

};

void bios_reset(void) {

    bios_putchar('\n', 0);

};

unsigned bios_version(void) {

    return BIOS_VERSION;

};

//---------------------------------------------------------------------------

// Function definitions for the private functions

void program_page (uint32_t page, uint8_t *buf)

{

    uint16_t i;

    uint8_t sreg;

    // Disable interrupts.

    sreg = SREG;

    cli();

    eeprom_busy_wait ();

    boot_page_erase (page);

    boot_spm_busy_wait ();      // Wait until the memory is erased.

    for (i=0; i<SPM_PAGESIZE; i+=2)

    {

        // Set up little-endian word.

        uint16_t w = *buf++;

        w += (*buf++) << 8;

        boot_page_fill (page + i, w);

    }

    boot_page_write (page);     // Store buffer in flash page.

    boot_spm_busy_wait();       // Wait until the memory is written.

    // Reenable RWW-section again. We need this if we want to jump back

    // to the application after bootloading.

    boot_rww_enable ();

    // Re-enable interrupts (if they were ever enabled).

    SREG = sreg;

}

static FILE bios_stdio = FDEV_SETUP_STREAM(bios_putchar, bios_getchar,

                                         _FDEV_SETUP_RW);

int main() {

    void (*app_reset)(void) = 0;

    // Setup USART for debug channel

    UCSRB = _BV(RXEN)|_BV(TXEN);

    UBRRL = (F_CPU / 16 / F_BAUD) - 1;

    stdout = &bios_stdio;

    stdin = &bios_stdio;

    bios->reset();

    printf("AVR BIOS\n");

    app_reset();

    return 0;

}