common/bootloader.c

   1 #include <avr/io.h>
   2 #include <avr/interrupt.h>
   3 #include <util/delay.h>
   4 #include "bootloader.h"
   5
   6 /* Start Bootloader from Application
   7  * See
   8  * http://www.pjrc.com/teensy/jump_to_bootloader.html
   9  * http://www.fourwalledcubicle.com/files/LUFA/Doc/120219/html/_page__software_bootloader_start.html
  10  */
  11
  12 /* Boot Section Size in bytes
  13  * Teensy halfKay   512
  14  * Atmel DFU loader 4096
  15  * LUFA bootloader  4096
  16  */
  17 #ifndef BOOT_SIZE
  18 #define BOOT_SIZE 512
  19 #endif
  20
  21 #define FLASH_SIZE          (FLASHEND + 1)
  22 #define BOOTLOADER_START    (FLASHEND - BOOT_SIZE)
  23
  24 void bootloader_jump(void) {
  25     cli();
  26     // disable watchdog, if enabled
  27     // disable all peripherals
  28     UDCON = 1;
  29     USBCON = (1<<FRZCLK);  // disable USB
  30     UCSR1B = 0;
  31     _delay_ms(5);
  32 #if defined(__AVR_AT90USB162__)
  33     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0;
  34     TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0;
  35     DDRB = 0; DDRC = 0; DDRD = 0;
  36     PORTB = 0; PORTC = 0; PORTD = 0;
  37 #elif defined(__AVR_ATmega32U4__)
  38     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
  39     TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0;
  40     DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0;
  41     PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
  42 #elif defined(__AVR_AT90USB646__)
  43     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
  44     TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
  45     DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
  46     PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
  47 #elif defined(__AVR_AT90USB1286__)
  48     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
  49     TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
  50     DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
  51     PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
  52 #endif
  53
  54     // start Bootloader
  55     ((void (*)(void))BOOTLOADER_START)();
  56 }