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-rw-r--r--common/avr/bootloader.c148
1 files changed, 148 insertions, 0 deletions
diff --git a/common/avr/bootloader.c b/common/avr/bootloader.c
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--- /dev/null
+++ b/common/avr/bootloader.c
@@ -0,0 +1,148 @@
+#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"
+
+#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
+
+#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
+ */
+#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
+
+ // 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();
+
+ // This is compled into 'icall', address should be in word unit, not byte.
+ ((void (*)(void))(BOOTLOADER_START/2))();
+ }
+}
+
+
+#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
+
+#ifdef PROTOCOL_PJRC
+ cli();
+ UDCON = 1;
+ USBCON = (1<<FRZCLK);
+ UCSR1B = 0;
+ _delay_ms(5);
+#endif
+
+ /*
+ * Initialize
+ */
+#if defined(__AVR_AT90USB162__)
+ EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0;
+ TIMSK0 = 0; TIMSK1 = 0; UCSR1B = 0;
+ DDRB = 0; DDRC = 0; DDRD = 0;
+ PORTB = 0; PORTC = 0; PORTD = 0;
+#elif defined(__AVR_ATmega32U4__)
+ EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
+ TIMSK0 = 0; TIMSK1 = 0; TIMSK3 = 0; TIMSK4 = 0; UCSR1B = 0; TWCR = 0;
+ DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0; TWCR = 0;
+ PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
+#elif defined(__AVR_AT90USB646__)
+ EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
+ TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
+ DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
+ PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
+#elif defined(__AVR_AT90USB1286__)
+ EIMSK = 0; PCICR = 0; SPCR = 0; ACSR = 0; EECR = 0; ADCSRA = 0;
+ TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0; TIMSK3 = 0; UCSR1B = 0; TWCR = 0;
+ DDRA = 0; DDRB = 0; DDRC = 0; DDRD = 0; DDRE = 0; DDRF = 0;
+ PORTA = 0; PORTB = 0; PORTC = 0; PORTD = 0; PORTE = 0; PORTF = 0;
+#endif
+
+ /*
+ * USBaspLoader
+ */
+#if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
+ // This makes custom USBasploader come up.
+ MCUSR = 0;
+
+ // initialize ports
+ PORTB = 0; PORTC= 0; PORTD = 0;
+ DDRB = 0; DDRC= 0; DDRD = 0;
+
+ // disable interrupts
+ EIMSK = 0; EECR = 0; SPCR = 0;
+ ACSR = 0; SPMCSR = 0; WDTCSR = 0; PCICR = 0;
+ TIMSK0 = 0; TIMSK1 = 0; TIMSK2 = 0;
+ ADCSRA = 0; TWCR = 0; UCSR0B = 0;
+#endif
+
+ // This is compled into 'icall', address should be in word unit, not byte.
+ ((void (*)(void))(BOOTLOADER_START/2))();
+}
+#endif