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-rw-r--r--vusb/bootloader_usbasp.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/vusb/bootloader_usbasp.c b/vusb/bootloader_usbasp.c
new file mode 100644
index 0000000000..6ec99cbf2d
--- /dev/null
+++ b/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");
+}