Refactored bootloader jumping. Added USBaspLoader support.

vusb/bootloader_usbasp.c

@@ -0,0 +1,47 @@
+/*
+Copyright 2011 Jun Wako <wakojun@gmail.com>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include "bootloader.h"
+
+
+void bootloader_jump(void) {
+    cli();
+    // This makes custom USBasploader come up.
+    MCUSR = 0;
+
+    // ATmega168PA
+    // 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;
+    
+    // Boot Loader Section Start Address:
+    // BOOTSZ       Size        Address
+    // (lock bit)   (word)      (word)      (byte)
+    // '11'         128         0x1F80      0x3F00
+    // '10'         256         0x1F00      0x3E00
+    // '01'         512         0x1E00      0x3C00
+    // '00'         1024        0x1C00      0x3800
+    asm volatile("jmp 0x3800");
+}