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| Source at commit 2dc2fb278cf17368265e066d025c2584d640f1a7 created 11 years 11 days ago. By Werner Almesberger, tornado/fw/tornado.c: update signal processing from sim/alg.c | |
|---|---|
| 1 | /* |
| 2 | * fw/boot.c - Antorcha boot loader |
| 3 | * |
| 4 | * Written 2012 by Werner Almesberger |
| 5 | * Copyright 2012 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 <avr/io.h> |
| 15 | #include <avr/pgmspace.h> |
| 16 | |
| 17 | #include "io.h" |
| 18 | #include "rf.h" |
| 19 | #include "proto.h" |
| 20 | #include "dispatch.h" |
| 21 | #include "fw.h" |
| 22 | |
| 23 | |
| 24 | #define MS_TO_LOOP(ms) ((uint32_t) (ms)*106) |
| 25 | |
| 26 | |
| 27 | static void wait_upload(void) |
| 28 | { |
| 29 | uint8_t buf[PAYLOAD+5]; /* 3 bytes header, 2 bytes CRC */ |
| 30 | uint32_t i; |
| 31 | uint8_t got; |
| 32 | |
| 33 | restart: |
| 34 | for (i = 0; i != MS_TO_LOOP(5000); i++) { |
| 35 | got = rf_recv(buf, sizeof(buf)); |
| 36 | if (got > 2 && fw_packet(buf, got-2)) |
| 37 | goto restart; |
| 38 | } |
| 39 | |
| 40 | } |
| 41 | |
| 42 | |
| 43 | int main(void) |
| 44 | { |
| 45 | volatile int zero = 0; |
| 46 | |
| 47 | /* Port B has two LEDs and the rest is SPI */ |
| 48 | PORTB = MASK(B, RF_nSS) | MASK(B, RF_nRST); |
| 49 | DDRB = MASK(B, RF_SCLK) | MASK(B, RF_MOSI) | MASK(B, RF_nSS) | |
| 50 | MASK(B, RF_nRST) | 0xc0; |
| 51 | |
| 52 | /* All port C pins drive LEDs */ |
| 53 | PORTC = 0; |
| 54 | DDRC = 0x3f; |
| 55 | |
| 56 | /* All port D pins drive LEDs */ |
| 57 | PORTD = 0; |
| 58 | DDRD = 0xff; |
| 59 | |
| 60 | /* Disable pull-ups */ |
| 61 | MCUCR |= 1 << PUD; |
| 62 | |
| 63 | /* |
| 64 | * Disable the watchdog timer, in case the boot loader has been |
| 65 | * entered by a watchdog reset commanded by the application. |
| 66 | */ |
| 67 | |
| 68 | MCUSR = 0; /* Remove override */ |
| 69 | WDTCSR |= 1 << WDCE; /* Enable change */ |
| 70 | WDTCSR = 1 << WDCE; /* Disable watchdog while still enabling |
| 71 | change */ |
| 72 | |
| 73 | rf_init(); |
| 74 | |
| 75 | /* |
| 76 | * Switch the LED inside the loop so that we get a short pulse one can |
| 77 | * observe on a scope. |
| 78 | */ |
| 79 | do { |
| 80 | SET(LED_B8); |
| 81 | wait_upload(); |
| 82 | CLR(LED_B8); |
| 83 | } while (pgm_read_byte(zero) == 0xff); |
| 84 | |
| 85 | ((void (*)(void)) 0)(); |
| 86 | |
| 87 | /* not reached */ |
| 88 | return 0; |
| 89 | } |
| 90 | |
Branches:
master
tornado-v1
