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#include "bios_funs.h"

#include "avr_cfg.h"

#include <inttypes.h>

#include <avr/io.h>

#include <avr/interrupt.h>

#include <avr/wdt.h>

#include <avr/pgmspace.h>

#include <stdio.h>

#include "flash.h"

#include "vectors.h" // Must be included after sfr_defs.h

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

// Globals

volatile long gMilliSecTick;

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

// Function definitions for the exported interface

void reset(void) {

    //Just loop and let the watchdog reset

    cli();

    while(1);

};

void bios_putchar(char c) {

    UART_PUTCHAR(c);

};

char bios_getchar(void) {

    char c;

    UART_GETCHAR(c)

    return c;

};

long timebase_get(void) {

    uint8_t sreg;

    long res;

    //Disable interrupts while reading tick count

    sreg=SREG;

    cli();

    res = gMilliSecTick;

    SREG=sreg;

    return res;

}

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

// Function definitions for the private functions

static int console_getchar(FILE *stream) {

    return bios_getchar();

}

static int console_putchar(char c, FILE *stream) {

    bios_putchar(c);

    return 0;

}

static FILE bios_stdio = FDEV_SETUP_STREAM(console_putchar, console_getchar,

                                         _FDEV_SETUP_RW);

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

// Interrupt Service Routines

// Read app_vectors.h!

ISR(TIMEBASE_VECTOR) {

    TIMEBASE_COUNTER -= TIMEBASE_RELOAD;

    gMilliSecTick++;

    wdt_reset();

}

int main() {

    void (*app_reset)(void) = 0;

    // Setup USART for debug channel

    UART_INIT();

    stdout = &bios_stdio;

    stdin = &bios_stdio;

    // Initialize a suitable hardware timer to create a 1KHz interrupt.

    TIMEBASE_INIT();

    // Enable watchdog timer to protect against an application locking the

    // node by leaving interrupts disabled. 

    wdt_enable(WDTO_500MS);

    // Move interrupt vectors to start of bootloader section and enable interrupts

    IVSEL_REG = _BV(IVCE);

    IVSEL_REG = _BV(IVSEL);

    sei();

    printf("AVR BIOS\n");

    if (pgm_read_word(0) != 0xffff) {

        printf("Starting application.\n");

        app_reset();

    }

    printf("No application found.\n");

    return 0;

}