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  * Teensy++ halfKay     1024
  17  * Atmel DFU loader     4096
  18  * LUFA bootloader      4096
  19  */
  20 #ifndef BOOT_SIZE
  21 #define BOOT_SIZE 512
  22 #endif
  23 #define FLASH_SIZE          (FLASHEND + 1L)
  24 #define BOOTLOADER_START    (FLASH_SIZE - BOOT_SIZE)
  25
  26
  27 /*
  28  * Entering the Bootloader via Software
  29  * http://www.fourwalledcubicle.com/files/LUFA/Doc/120730/html/_page__software_bootloader_start.html
  30  */
  31 #define BOOTLOADER_RESET_KEY 0xB007B007
  32 uint32_t reset_key  __attribute__ ((section (".noinit")));
  33
  34 /* initialize MCU status by watchdog reset */
  35 void bootloader_jump(void) {
  36 #ifdef PROTOCOL_LUFA
  37     USB_Disable();
  38     cli();
  39     _delay_ms(2000);
  40 #endif
  41
  42 #ifdef PROTOCOL_PJRC
  43     cli();
  44     UDCON = 1;
  45     USBCON = (1<<FRZCLK);
  46     UCSR1B = 0;
  47     _delay_ms(5);
  48 #endif
  49
  50     // watchdog reset
  51     reset_key = BOOTLOADER_RESET_KEY;
  52     wdt_enable(WDTO_250MS);
  53     for (;;);
  54 }
  55
  56
  57 /* this runs before main() */
  58 void bootloader_jump_after_watchdog_reset(void) __attribute__ ((used, naked, section (".init3")));
  59 void bootloader_jump_after_watchdog_reset(void)
  60 {
  61     if ((MCUSR & (1<<WDRF)) && reset_key == BOOTLOADER_RESET_KEY) {
  62         reset_key = 0;
  63
  64         // My custom USBasploader requires this to come up.
  65         MCUSR = 0;
  66
  67         // Seems like Teensy halfkay loader requires clearing WDRF and disabling watchdog.
  68         MCUSR &= ~(1<<WDRF);
  69         wdt_disable();
  70
  71         ((void (*)(void))BOOTLOADER_START)();
  72     }
  73 }
  74
  75
  76 #if 0
  77 /* Jumping To The Bootloader
  78  * http://www.pjrc.com/teensy/jump_to_bootloader.html
  79  *
  80  * This method doen't work when using LUFA. idk why.
  81  * - needs to initialize more regisers or interrupt setting?
  82  */
  83 void bootloader_jump(void) {
  84 #ifdef PROTOCOL_LUFA
  85     USB_Disable();
  86     cli();
  87     _delay_ms(2000);
  88 #endif
  89
  90 #ifdef PROTOCOL_PJRC
  91     cli();
  92     UDCON = 1;
  93     USBCON = (1<<FRZCLK);
  94     UCSR1B = 0;
  95     _delay_ms(5);
  96 #endif
  97
  98     /*
  99      * Initialize
 100      */
 101 #if defined(__AVR_AT90USB162__)
 102     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0;
 103     TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0;
 104     DDRB = 0; DDRC = 0; DDRD = 0;
 105     PORTB = 0; PORTC = 0; PORTD = 0;
 106 #elif defined(__AVR_ATmega32U4__)
 107     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
 108     TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0;
 109     DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0;
 110     PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
 111 #elif defined(__AVR_AT90USB646__)
 112     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
 113     TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
 114     DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
 115     PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
 116 #elif defined(__AVR_AT90USB1286__)
 117     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
 118     TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
 119     DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
 120     PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
 121 #endif
 122
 123     /*
 124      * USBaspLoader
 125      */
 126 #if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
 127     // This makes custom USBasploader come up.
 128     MCUSR = 0;
 129
 130     // initialize ports
 131     PORTB = 0; PORTC= 0; PORTD = 0;
 132     DDRB = 0; DDRC= 0; DDRD = 0;
 133
 134     // disable interrupts
 135     EIMSK = 0; EECR = 0; SPCR = 0;
 136     ACSR = 0; SPMCSR = 0; WDTCSR = 0; PCICR = 0;
 137     TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0;
 138     ADCSRA = 0; TWCR = 0; UCSR0B = 0;
 139 #endif
 140
 141     // start Bootloader
 142     ((void (*)(void))BOOTLOADER_START)();
 143 }
 144 #endif