common/bootloader.c

   1 #include <stdint.h>
   2 #include <stdbool.h>
   3 #include <avr/io.h>
   4 #include <avr/interrupt.h>
   5 #include <avr/wdt.h>
   6 #include <util/delay.h>
   7 #include "bootloader.h"
   8
   9 #ifdef PROTOCOL_LUFA
  10 #include <LUFA/Drivers/USB/USB.h>
  11 #endif
  12
  13
  14 /* Boot Section Size in bytes
  15  * Teensy halfKay   512
  16  * Atmel DFU loader 4096
  17  * LUFA bootloader  4096
  18  */
  19 #ifndef BOOT_SIZE
  20 #define BOOT_SIZE 512
  21 #endif
  22 #define FLASH_SIZE          (FLASHEND + 1)
  23 #define BOOTLOADER_START    (FLASH_SIZE - BOOT_SIZE)
  24
  25
  26 /*
  27  * Entering the Bootloader via Software
  28  * http://www.fourwalledcubicle.com/files/LUFA/Doc/120730/html/_page__software_bootloader_start.html
  29  */
  30 #define BOOTLOADER_RESET_KEY 0xB007B007
  31 uint32_t reset_key  __attribute__ ((section (".noinit")));
  32
  33 /* initialize MCU status by watchdog reset */
  34 void bootloader_jump(void) {
  35 #ifdef PROTOCOL_LUFA
  36     USB_Disable();
  37     cli();
  38     _delay_ms(2000);
  39 #endif
  40
  41 #ifdef PROTOCOL_PJRC
  42     cli();
  43     UDCON = 1;
  44     USBCON = (1<<FRZCLK);
  45     UCSR1B = 0;
  46     _delay_ms(5);
  47 #endif
  48
  49     // watchdog reset
  50     reset_key = BOOTLOADER_RESET_KEY;
  51     wdt_enable(WDTO_250MS);
  52     for (;;);
  53 }
  54
  55
  56 /* this runs before main() */
  57 void bootloader_jump_after_watchdog_reset(void) __attribute__ ((used, naked, section (".init3")));
  58 void bootloader_jump_after_watchdog_reset(void)
  59 {
  60     if ((MCUSR & (1<<WDRF)) && reset_key == BOOTLOADER_RESET_KEY) {
  61
  62         #if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
  63         // This makes custom USBasploader come up.
  64         MCUSR = 0;
  65         #endif
  66
  67         reset_key = 0;
  68         ((void (*)(void))BOOTLOADER_START)();
  69     }
  70 }
  71
  72
  73 #if 0
  74 /* Jumping To The Bootloader
  75  * http://www.pjrc.com/teensy/jump_to_bootloader.html
  76  *
  77  * This method doen't work when using LUFA. idk why.
  78  * - needs to initialize more regisers or interrupt setting?
  79  */
  80 void bootloader_jump(void) {
  81 #ifdef PROTOCOL_LUFA
  82     USB_Disable();
  83     cli();
  84     _delay_ms(2000);
  85 #endif
  86
  87 #ifdef PROTOCOL_PJRC
  88     cli();
  89     UDCON = 1;
  90     USBCON = (1<<FRZCLK);
  91     UCSR1B = 0;
  92     _delay_ms(5);
  93 #endif
  94
  95     /*
  96      * Initialize
  97      */
  98 #if defined(__AVR_AT90USB162__)
  99     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0;
 100     TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0;
 101     DDRB = 0; DDRC = 0; DDRD = 0;
 102     PORTB = 0; PORTC = 0; PORTD = 0;
 103 #elif defined(__AVR_ATmega32U4__)
 104     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
 105     TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0;
 106     DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0;
 107     PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
 108 #elif defined(__AVR_AT90USB646__)
 109     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
 110     TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
 111     DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
 112     PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
 113 #elif defined(__AVR_AT90USB1286__)
 114     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
 115     TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
 116     DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
 117     PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
 118 #endif
 119
 120     /*
 121      * USBaspLoader
 122      */
 123 #if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
 124     // This makes custom USBasploader come up.
 125     MCUSR = 0;
 126
 127     // initialize ports
 128     PORTB = 0; PORTC= 0; PORTD = 0;
 129     DDRB = 0; DDRC= 0; DDRD = 0;
 130
 131     // disable interrupts
 132     EIMSK = 0; EECR = 0; SPCR = 0;
 133     ACSR = 0; SPMCSR = 0; WDTCSR = 0; PCICR = 0;
 134     TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0;
 135     ADCSRA = 0; TWCR = 0; UCSR0B = 0;
 136 #endif
 137
 138     // start Bootloader
 139     ((void (*)(void))BOOTLOADER_START)();
 140 }
 141 #endif