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