/* LED Blink Example with USB Debug Channel for Teensy USB Development Board
 * http://www.pjrc.com/teensy/
 * Copyright (c) 2008, 2010 PJRC.COM, LLC
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include <avr/io.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include "usb_debug_only.h"
#include "print.h"


// Teensy 2.0: LED is active high
#if defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB1286__)
#define LED_ON        (PORTD |= (1<<6))
#define LED_OFF        (PORTD &= ~(1<<6))

// Teensy 1.0: LED is active low
#else
#define LED_ON    (PORTD &= ~(1<<6))
#define LED_OFF    (PORTD |= (1<<6))
#endif

#define LED_CONFIG    (DDRD |= (1<<6))
#define CPU_PRESCALE(n)    (CLKPR = 0x80, CLKPR = (n))
#define DIT 80        /* unit time for morse code */

void morse_character(char c);
void morse_P(const char *s);
const unsigned char morse_code_table[];


int main(void)
{
    unsigned char i;

    // set for 16 MHz clock, and make sure the LED is off
    CPU_PRESCALE(0);
    LED_CONFIG;
    LED_OFF;

    // initialize the USB, but don't want for the host to
    // configure.  The first several messages sent will be
    // lost because the PC hasn't configured the USB yet,
    // but we care more about blinking than debug messages!
    usb_init();

    // blink morse code messages!
    while (1) {
        for (i=0; i<6; i++) {
            morse_P(PSTR("SOS"));
            _delay_ms(1500);
        }
        morse_P(PSTR("DOES ANYBODY STILL KNOW MORSE CODE?"));
        _delay_ms(4000);
    }
}

// blink a single character in Morse code
void morse_character(char c)
{
    unsigned char code, count;

    if (c == ' ') {
        print("Space\n");
        _delay_ms(DIT * 7);
        return;
    }
    if (c < 'A' || c > 'Z') {
        print("Opps, unsupported character: ");
        pchar(c);
        print("\n");
        return;    
    }
    print("Char ");
    pchar(c);
    pchar(':');
    code = pgm_read_byte(morse_code_table + (c - 'A'));
    for (count = code & 0x07; count > 0; count--) {
        LED_ON;
        if (code & 0x80) {
            print(" dah");
            _delay_ms(DIT * 3);
        } else {
            print(" dit");
            _delay_ms(DIT);
        }
        LED_OFF;
        _delay_ms(DIT);
        code = code << 1;
    }
    print("\n");
    _delay_ms(DIT * 2);
}

// blink an entire message in Morse code
// the string must be in flash memory (using PSTR macro)
void morse_P(const char *s)
{
    char c;
    
    while (1) {
        c = pgm_read_byte(s++);
        if (!c) break;
        morse_character(c);
    }
    print("\n");
}

// lookup table for all 26 letters.  Upper 5 bits are the pulses
// to send (MSB first), and the lower 3 bits are the number of
// bits to send for this letter.
const unsigned char PROGMEM morse_code_table[] = {
    0x40 + 2,    // A: .-
    0x80 + 4,    // B: -...
    0xA0 + 4,    // C: -.-.
    0x80 + 3,    // D: -..
    0x00 + 1,    // E: .
    0x20 + 4,    // F: ..-.
    0xC0 + 3,    // G: --.
    0x00 + 4,    // H: ....
    0x00 + 2,    // I: ..
    0x70 + 4,    // J: .---
    0xA0 + 3,    // K: -.-
    0x40 + 4,    // L: .-..
    0xC0 + 2,    // M: --
    0x80 + 2,    // N: -.
    0xE0 + 3,    // O: ---
    0x60 + 4,    // P: .--.
    0xD0 + 4,    // Q: --.-
    0x40 + 3,    // R: .-.
    0x00 + 3,    // S: ...
    0x80 + 1,    // T: -
    0x20 + 3,    // U: ..-
    0x10 + 4,    // V: ...-
    0x60 + 3,    // W: .--
    0x90 + 4,    // X: -..-
    0xB0 + 4,    // Y: -.--
    0xC0 + 4    // Z: --..
};

#include <avr/io.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include "usb_debug_only.h"
#include "print.h"

include <avr/io.h>
include <avr/pgmspace.h>
include <util/delay.h>
include "usb_debug_only.h"
include "print.h"

// Teensy 2.0: LED is active high
#if defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB1286__)
#define LED_ON        (PORTD |= (1<<6))
#define LED_OFF        (PORTD &= ~(1<<6))

// Teensy 1.0: LED is active low
#else
#define LED_ON    (PORTD &= ~(1<<6))
#define LED_OFF    (PORTD |= (1<<6))
#endif

#define LED_CONFIG    (DDRD |= (1<<6))
#define CPU_PRESCALE(n)    (CLKPR = 0x80, CLKPR = (n))
#define DIT 80        /* unit time for morse code */

void morse_character(char c);
void morse_P(const char *s);
const unsigned char morse_code_table[];

// Teensy 2.0: LED is active high
if defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB1286__)
define LED_ON        (PORTD |= (1<<6))
define LED_OFF        (PORTD &= ~(1<<6))

// Teensy 1.0: LED is active low
#else
#define LED_ON    (PORTD &= ~(1<<6))
#define LED_OFF    (PORTD |= (1<<6))
#endif

define LED_CONFIG    (DDRD |= (1<<6))
define CPU_PRESCALE(n)    (CLKPR = 0x80, CLKPR = (n))
define DIT 80        /* unit time for morse code */

void morse_character(char c);
void morse_P(const char *s);
const unsigned char morse_code_table[];

// Teensy 2.0: LED is active high
if defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB1286__)
define LED_ON        (PORTD |= (1<<6))
define LED_OFF        (PORTD &= ~(1<<6))

// Teensy 1.0: LED is active low
else
define LED_ON    (PORTD &= ~(1<<6))
define LED_OFF    (PORTD |= (1<<6))
endif

define LED_CONFIG    (DDRD |= (1<<6))
define CPU_PRESCALE(n)    (CLKPR = 0x80, CLKPR = (n))
define DIT 80        /* unit time for morse code */

void morse_character(char c);
void morse_P(const char *s);
const unsigned char morse_code_table[];