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  *   USBaspLoader        2048
  20  */
  21 #ifndef BOOTLOADER_SIZE
  22 #warning To use bootloader_jump() you need to define BOOTLOADER_SIZE in config.h.
  23 #define BOOTLOADER_SIZE     4096
  24 #endif
  25
  26 #define FLASH_SIZE          (FLASHEND + 1L)
  27 #define BOOTLOADER_START    (FLASH_SIZE - BOOTLOADER_SIZE)
  28
  29
  30 /*
  31  * Entering the Bootloader via Software
  32  * http://www.fourwalledcubicle.com/files/LUFA/Doc/120730/html/_page__software_bootloader_start.html
  33  */
  34 #define BOOTLOADER_RESET_KEY 0xB007B007
  35 uint32_t reset_key  __attribute__ ((section (".noinit")));
  36
  37 /* initialize MCU status by watchdog reset */
  38 void bootloader_jump(void) {
  39 #ifdef PROTOCOL_LUFA
  40     USB_Disable();
  41     cli();
  42     _delay_ms(2000);
  43 #endif
  44
  45 #ifdef PROTOCOL_PJRC
  46     cli();
  47     UDCON = 1;
  48     USBCON = (1<<FRZCLK);
  49     UCSR1B = 0;
  50     _delay_ms(5);
  51 #endif
  52
  53     // watchdog reset
  54     reset_key = BOOTLOADER_RESET_KEY;
  55     wdt_enable(WDTO_250MS);
  56     for (;;);
  57 }
  58
  59
  60 /* this runs before main() */
  61 void bootloader_jump_after_watchdog_reset(void) __attribute__ ((used, naked, section (".init3")));
  62 void bootloader_jump_after_watchdog_reset(void)
  63 {
  64     if ((MCUSR & (1<<WDRF)) && reset_key == BOOTLOADER_RESET_KEY) {
  65         reset_key = 0;
  66
  67         // My custom USBasploader requires this to come up.
  68         MCUSR = 0;
  69
  70         // Seems like Teensy halfkay loader requires clearing WDRF and disabling watchdog.
  71         MCUSR &= ~(1<<WDRF);
  72         wdt_disable();
  73
  74         ((void (*)(void))BOOTLOADER_START)();
  75     }
  76 }
  77
  78
  79 #if 0
  80 /* Jumping To The Bootloader
  81  * http://www.pjrc.com/teensy/jump_to_bootloader.html
  82  *
  83  * This method doen't work when using LUFA. idk why.
  84  * - needs to initialize more regisers or interrupt setting?
  85  */
  86 void bootloader_jump(void) {
  87 #ifdef PROTOCOL_LUFA
  88     USB_Disable();
  89     cli();
  90     _delay_ms(2000);
  91 #endif
  92
  93 #ifdef PROTOCOL_PJRC
  94     cli();
  95     UDCON = 1;
  96     USBCON = (1<<FRZCLK);
  97     UCSR1B = 0;
  98     _delay_ms(5);
  99 #endif
 100
 101     /*
 102      * Initialize
 103      */
 104 #if defined(__AVR_AT90USB162__)
 105     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0;
 106     TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0;
 107     DDRB = 0; DDRC = 0; DDRD = 0;
 108     PORTB = 0; PORTC = 0; PORTD = 0;
 109 #elif defined(__AVR_ATmega32U4__)
 110     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
 111     TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0;
 112     DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0;
 113     PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
 114 #elif defined(__AVR_AT90USB646__)
 115     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
 116     TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
 117     DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
 118     PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
 119 #elif defined(__AVR_AT90USB1286__)
 120     EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
 121     TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
 122     DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
 123     PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
 124 #endif
 125
 126     /*
 127      * USBaspLoader
 128      */
 129 #if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
 130     // This makes custom USBasploader come up.
 131     MCUSR = 0;
 132
 133     // initialize ports
 134     PORTB = 0; PORTC= 0; PORTD = 0;
 135     DDRB = 0; DDRC= 0; DDRD = 0;
 136
 137     // disable interrupts
 138     EIMSK = 0; EECR = 0; SPCR = 0;
 139     ACSR = 0; SPMCSR = 0; WDTCSR = 0; PCICR = 0;
 140     TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0;
 141     ADCSRA = 0; TWCR = 0; UCSR0B = 0;
 142 #endif
 143
 144     // start Bootloader
 145     ((void (*)(void))BOOTLOADER_START)();
 146 }
 147 #endif