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| Source at commit 0f17c404d2bf724b17d8443d6b76701f50be673d created 11 years 6 days ago. By Werner Almesberger, BOOKSHELF: add data sheets of parts for next Tornado iteration | |
|---|---|
| 1 | /* |
| 2 | * fw/fw.h - Firmware upload protocol |
| 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 <stdbool.h> |
| 15 | #include <stdint.h> |
| 16 | #include <string.h> |
| 17 | |
| 18 | #define F_CPU 8000000UL |
| 19 | #include <util/delay.h> |
| 20 | |
| 21 | #include "io.h" |
| 22 | #include "flash.h" |
| 23 | #include "proto.h" |
| 24 | #include "rf.h" |
| 25 | #include "fw.h" |
| 26 | |
| 27 | |
| 28 | static const uint8_t unlock_secret[PAYLOAD] = { |
| 29 | #include "unlock-secret.inc" |
| 30 | }; |
| 31 | |
| 32 | |
| 33 | static bool locked = 1; |
| 34 | |
| 35 | |
| 36 | static bool fw_payload(uint8_t seq, uint8_t limit, const uint8_t *payload) |
| 37 | { |
| 38 | if (!seq) { |
| 39 | locked = memcmp(unlock_secret, payload, PAYLOAD) != 0; |
| 40 | flash_start(); |
| 41 | return 1; |
| 42 | } |
| 43 | if (locked) |
| 44 | return 0; |
| 45 | if (!flash_can_write(PAYLOAD)) |
| 46 | return 0; |
| 47 | flash_write(payload, PAYLOAD); |
| 48 | if (seq == limit) |
| 49 | flash_end_write(); |
| 50 | return 1; |
| 51 | } |
| 52 | |
| 53 | |
| 54 | bool fw_packet(const uint8_t *buf, uint8_t len) |
| 55 | { |
| 56 | static uint8_t seq = 0; |
| 57 | static uint8_t limit; |
| 58 | uint8_t ack[] = { FIRMWARE+1, buf[1], buf[2] }; |
| 59 | |
| 60 | /* short flash to indicate reception */ |
| 61 | SET(LED_B7); |
| 62 | _delay_ms(1); |
| 63 | CLR(LED_B7); |
| 64 | |
| 65 | /* Check packet for formal validity */ |
| 66 | |
| 67 | if (len != 64+3) |
| 68 | return 0; |
| 69 | if (buf[0] != FIRMWARE) |
| 70 | return 0; |
| 71 | if (buf[1] > buf[2]) |
| 72 | return 0; |
| 73 | |
| 74 | /* Synchronize sequence numbers */ |
| 75 | |
| 76 | if (!buf[1]) { |
| 77 | seq = 0; |
| 78 | limit = buf[2]; |
| 79 | } else { |
| 80 | if (buf[2] != limit) |
| 81 | return 0; |
| 82 | if (buf[1]+1 == seq) |
| 83 | goto ack; |
| 84 | if (buf[1] != seq) |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | /* Process the payload */ |
| 89 | |
| 90 | if (!fw_payload(seq, limit, buf+3)) |
| 91 | return 0; |
| 92 | seq++; |
| 93 | ack: |
| 94 | /* clearly visible short blink to indicate progress */ |
| 95 | SET(LED_B6); |
| 96 | rf_send(ack, sizeof(ack)); |
| 97 | CLR(LED_B6); |
| 98 | return 1; |
| 99 | } |
| 100 | |
Branches:
master
tornado-v1
