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 // TODO: support usbasp
  13 /* Boot Section Size in bytes
  14  * Teensy halfKay   512
  15  * Atmel DFU loader 4096
  16  * LUFA bootloader  4096
  17  */
  18 #ifndef BOOT_SIZE
  19 #define BOOT_SIZE 512
  20 #endif
  21
  22 #define FLASH_SIZE          (FLASHEND + 1)
  23 #define BOOTLOADER_START    (FLASHEND - BOOT_SIZE)
  24
  25 void bootloader_jump(void) {
  26     cli();
  27
  28     //
  29     //Teensy
  30     //
  31 #if defined(__AVR_AT90USB162__) || defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB1286__)
  32     // disable watchdog, if enabled
  33     // disable all peripherals
  34     UDCON = 1;
  35     USBCON = (1<<FRZCLK);  // disable USB
  36     UCSR1B = 0;
  37     _delay_ms(5);
  38 #else
  39     // This makes custom USBasploader come up.
  40     MCUSR = 0;
  41 #endif
  42
  43 #if defined(__AVR_AT90USB162__)
  44     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0;
  45     TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0;
  46     DDRB = 0; DDRC = 0; DDRD = 0;
  47     PORTB = 0; PORTC = 0; PORTD = 0;
  48 #elif defined(__AVR_ATmega32U4__)
  49     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
  50     TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0;
  51     DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0;
  52     PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
  53 #elif defined(__AVR_AT90USB646__)
  54     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
  55     TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
  56     DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
  57     PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
  58 #elif defined(__AVR_AT90USB1286__)
  59     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
  60     TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
  61     DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
  62     PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
  63 #endif
  64
  65
  66     //
  67     //USBasp
  68     //
  69 #if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P)
  70     // This makes custom USBasploader come up.
  71     MCUSR = 0;
  72
  73     // initialize ports
  74     PORTB = 0; PORTC= 0; PORTD = 0;
  75     DDRB = 0; DDRC= 0; DDRD = 0;
  76
  77     // disable interrupts
  78     EIMSK = 0; EECR = 0; SPCR = 0;
  79     ACSR = 0; SPMCSR = 0; WDTCSR = 0; PCICR = 0;
  80     TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0;
  81     ADCSRA = 0; TWCR = 0; UCSR0B = 0;
  82 #endif
  83
  84
  85     // start Bootloader
  86     ((void (*)(void))BOOTLOADER_START)();
  87 }