diff options
Diffstat (limited to 'common/bootloader.c')
| -rw-r--r-- | common/bootloader.c | 116 |
1 files changed, 88 insertions, 28 deletions
diff --git a/common/bootloader.c b/common/bootloader.c index 6e04efbbda..43a7e47ce2 100644 --- a/common/bootloader.c +++ b/common/bootloader.c @@ -1,45 +1,106 @@ +#include <stdint.h> +#include <stdbool.h> #include <avr/io.h> #include <avr/interrupt.h> +#include <avr/wdt.h> #include <util/delay.h> #include "bootloader.h" -/* Start Bootloader from Application - * See - * http://www.pjrc.com/teensy/jump_to_bootloader.html - * http://www.fourwalledcubicle.com/files/LUFA/Doc/120219/html/_page__software_bootloader_start.html +#ifdef PROTOCOL_LUFA +#include <LUFA/Drivers/USB/USB.h> +#endif + + +/* Boot Section Size in *BYTEs* + * Teensy halfKay 512 + * Teensy++ halfKay 1024 + * Atmel DFU loader 4096 + * LUFA bootloader 4096 + * USBaspLoader 2048 */ +#ifndef BOOTLOADER_SIZE +#warning To use bootloader_jump() you need to define BOOTLOADER_SIZE in config.h. +#define BOOTLOADER_SIZE 4096 +#endif -// TODO: support usbasp -/* Boot Section Size in bytes - * Teensy halfKay 512 - * Atmel DFU loader 4096 - * LUFA bootloader 4096 +#define FLASH_SIZE (FLASHEND + 1L) +#define BOOTLOADER_START (FLASH_SIZE - BOOTLOADER_SIZE) + + +/* + * Entering the Bootloader via Software + * http://www.fourwalledcubicle.com/files/LUFA/Doc/120730/html/_page__software_bootloader_start.html */ -#ifndef BOOT_SIZE -#define BOOT_SIZE 512 +#define BOOTLOADER_RESET_KEY 0xB007B007 +uint32_t reset_key __attribute__ ((section (".noinit"))); + +/* initialize MCU status by watchdog reset */ +void bootloader_jump(void) { +#ifdef PROTOCOL_LUFA + USB_Disable(); + cli(); + _delay_ms(2000); +#endif + +#ifdef PROTOCOL_PJRC + cli(); + UDCON = 1; + USBCON = (1<<FRZCLK); + UCSR1B = 0; + _delay_ms(5); #endif -#define FLASH_SIZE (FLASHEND + 1) -#define BOOTLOADER_START (FLASHEND - BOOT_SIZE) + // watchdog reset + reset_key = BOOTLOADER_RESET_KEY; + wdt_enable(WDTO_250MS); + for (;;); +} + +/* this runs before main() */ +void bootloader_jump_after_watchdog_reset(void) __attribute__ ((used, naked, section (".init3"))); +void bootloader_jump_after_watchdog_reset(void) +{ + if ((MCUSR & (1<<WDRF)) && reset_key == BOOTLOADER_RESET_KEY) { + reset_key = 0; + + // My custom USBasploader requires this to come up. + MCUSR = 0; + + // Seems like Teensy halfkay loader requires clearing WDRF and disabling watchdog. + MCUSR &= ~(1<<WDRF); + wdt_disable(); + + ((void (*)(void))BOOTLOADER_START)(); + } +} + + +#if 0 +/* Jumping To The Bootloader + * http://www.pjrc.com/teensy/jump_to_bootloader.html + * + * This method doen't work when using LUFA. idk why. + * - needs to initialize more regisers or interrupt setting? + */ void bootloader_jump(void) { +#ifdef PROTOCOL_LUFA + USB_Disable(); cli(); + _delay_ms(2000); +#endif - // - //Teensy - // -#if defined(__AVR_AT90USB162__) || defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB1286__) - // disable watchdog, if enabled - // disable all peripherals +#ifdef PROTOCOL_PJRC + cli(); UDCON = 1; - USBCON = (1<<FRZCLK); // disable USB + USBCON = (1<<FRZCLK); UCSR1B = 0; _delay_ms(5); -#else - // This makes custom USBasploader come up. - MCUSR = 0; #endif + /* + * Initialize + */ #if defined(__AVR_AT90USB162__) EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0; @@ -62,10 +123,9 @@ void bootloader_jump(void) { PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0; #endif - - // - //USBasp - // + /* + * USBaspLoader + */ #if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__) // This makes custom USBasploader come up. MCUSR = 0; @@ -81,7 +141,7 @@ void bootloader_jump(void) { ADCSRA = 0; TWCR = 0; UCSR0B = 0; #endif - // start Bootloader ((void (*)(void))BOOTLOADER_START)(); } +#endif |