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