IEEE 802.15.4 subsystem
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| Source at commit a5ab9bbf0f0749f37c144d7fe4586dbd67c72093 created 6 years 9 months ago. By Werner Almesberger, atusb/: use page layout similar to eeschema's traditional default | |
|---|---|
| 1 | /* |
| 2 | * fw/boot.c - DFU boot loader for ATUSB |
| 3 | * |
| 4 | * Written 2008-2011 by Werner Almesberger |
| 5 | * Copyright 2008-2011 Werner Almesberger |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | |
| 14 | #include <stdint.h> |
| 15 | |
| 16 | #include <avr/io.h> |
| 17 | #include <avr/interrupt.h> |
| 18 | #include <avr/pgmspace.h> |
| 19 | |
| 20 | #define F_CPU 8000000UL |
| 21 | #include <util/delay.h> |
| 22 | |
| 23 | #include "usb.h" |
| 24 | #include "dfu.h" |
| 25 | |
| 26 | #include "board.h" |
| 27 | #include "spi.h" |
| 28 | #include "atusb/ep0.h" |
| 29 | |
| 30 | |
| 31 | #define MS_TO_LOOPS(ms) ((uint32_t) (ms)*335) |
| 32 | |
| 33 | |
| 34 | static void (*run_payload)(void) = 0; |
| 35 | |
| 36 | |
| 37 | int main(void) |
| 38 | { |
| 39 | /* |
| 40 | * pgm_read_byte gets cached and there doesn't seem to be any other |
| 41 | * way to dissuade gcc from doing this. |
| 42 | */ |
| 43 | volatile int zero = 0; |
| 44 | uint32_t loop = 0; |
| 45 | |
| 46 | board_init(); |
| 47 | reset_rf(); |
| 48 | |
| 49 | /* now we should be at 8 MHz */ |
| 50 | |
| 51 | usb_init(); |
| 52 | dfu_init(); |
| 53 | |
| 54 | /* move interrupt vectors to the boot loader */ |
| 55 | MCUCR = 1 << IVCE; |
| 56 | MCUCR = 1 << IVSEL; |
| 57 | |
| 58 | sei(); |
| 59 | |
| 60 | led(1); |
| 61 | |
| 62 | while (loop != MS_TO_LOOPS(2500)) { |
| 63 | if (dfu.state == dfuIDLE && pgm_read_byte(zero) != 0xff) |
| 64 | loop++; |
| 65 | else |
| 66 | loop = 0; |
| 67 | } |
| 68 | |
| 69 | led(0); |
| 70 | |
| 71 | cli(); |
| 72 | |
| 73 | usb_reset(); |
| 74 | run_payload(); |
| 75 | |
| 76 | while (1); /* not reached */ |
| 77 | } |
| 78 | |
