Hardware Design: SIE
Sign in or create your account | Project List | Help
Hardware Design: SIE Git Source Tree
Root/
Source at commit 9b75552c8365d3aab7c0eb280d554a2cec9fab34 created 13 years 5 months ago. By carlos, Adding bootloader for lm32 | |
---|---|
1 | /* |
2 | Copyright 2001, 2002 Georges Menie (www.menie.org) |
3 | Copyright 2004 Darrell Harmon modified to work in a bootloader |
4 | |
5 | This program is free software; you can redistribute it and/or modify |
6 | it under the terms of the GNU Lesser General Public License as published by |
7 | the Free Software Foundation; either version 2 of the License, or |
8 | (at your option) any later version. |
9 | |
10 | This program is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | GNU Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public License |
16 | along with this program; if not, write to the Free Software |
17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ |
19 | |
20 | #include "soc-hw.h" |
21 | #define SOH 0x01 |
22 | #define EOT 0x04 |
23 | #define ACK 0x06 |
24 | #define NAK 0x15 |
25 | |
26 | |
27 | /* CRC16 implementation acording to CCITT standards */ |
28 | |
29 | static const unsigned short crc16tab[256]= { |
30 | 0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7, |
31 | 0x8108,0x9129,0xa14a,0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef, |
32 | 0x1231,0x0210,0x3273,0x2252,0x52b5,0x4294,0x72f7,0x62d6, |
33 | 0x9339,0x8318,0xb37b,0xa35a,0xd3bd,0xc39c,0xf3ff,0xe3de, |
34 | 0x2462,0x3443,0x0420,0x1401,0x64e6,0x74c7,0x44a4,0x5485, |
35 | 0xa56a,0xb54b,0x8528,0x9509,0xe5ee,0xf5cf,0xc5ac,0xd58d, |
36 | 0x3653,0x2672,0x1611,0x0630,0x76d7,0x66f6,0x5695,0x46b4, |
37 | 0xb75b,0xa77a,0x9719,0x8738,0xf7df,0xe7fe,0xd79d,0xc7bc, |
38 | 0x48c4,0x58e5,0x6886,0x78a7,0x0840,0x1861,0x2802,0x3823, |
39 | 0xc9cc,0xd9ed,0xe98e,0xf9af,0x8948,0x9969,0xa90a,0xb92b, |
40 | 0x5af5,0x4ad4,0x7ab7,0x6a96,0x1a71,0x0a50,0x3a33,0x2a12, |
41 | 0xdbfd,0xcbdc,0xfbbf,0xeb9e,0x9b79,0x8b58,0xbb3b,0xab1a, |
42 | 0x6ca6,0x7c87,0x4ce4,0x5cc5,0x2c22,0x3c03,0x0c60,0x1c41, |
43 | 0xedae,0xfd8f,0xcdec,0xddcd,0xad2a,0xbd0b,0x8d68,0x9d49, |
44 | 0x7e97,0x6eb6,0x5ed5,0x4ef4,0x3e13,0x2e32,0x1e51,0x0e70, |
45 | 0xff9f,0xefbe,0xdfdd,0xcffc,0xbf1b,0xaf3a,0x9f59,0x8f78, |
46 | 0x9188,0x81a9,0xb1ca,0xa1eb,0xd10c,0xc12d,0xf14e,0xe16f, |
47 | 0x1080,0x00a1,0x30c2,0x20e3,0x5004,0x4025,0x7046,0x6067, |
48 | 0x83b9,0x9398,0xa3fb,0xb3da,0xc33d,0xd31c,0xe37f,0xf35e, |
49 | 0x02b1,0x1290,0x22f3,0x32d2,0x4235,0x5214,0x6277,0x7256, |
50 | 0xb5ea,0xa5cb,0x95a8,0x8589,0xf56e,0xe54f,0xd52c,0xc50d, |
51 | 0x34e2,0x24c3,0x14a0,0x0481,0x7466,0x6447,0x5424,0x4405, |
52 | 0xa7db,0xb7fa,0x8799,0x97b8,0xe75f,0xf77e,0xc71d,0xd73c, |
53 | 0x26d3,0x36f2,0x0691,0x16b0,0x6657,0x7676,0x4615,0x5634, |
54 | 0xd94c,0xc96d,0xf90e,0xe92f,0x99c8,0x89e9,0xb98a,0xa9ab, |
55 | 0x5844,0x4865,0x7806,0x6827,0x18c0,0x08e1,0x3882,0x28a3, |
56 | 0xcb7d,0xdb5c,0xeb3f,0xfb1e,0x8bf9,0x9bd8,0xabbb,0xbb9a, |
57 | 0x4a75,0x5a54,0x6a37,0x7a16,0x0af1,0x1ad0,0x2ab3,0x3a92, |
58 | 0xfd2e,0xed0f,0xdd6c,0xcd4d,0xbdaa,0xad8b,0x9de8,0x8dc9, |
59 | 0x7c26,0x6c07,0x5c64,0x4c45,0x3ca2,0x2c83,0x1ce0,0x0cc1, |
60 | 0xef1f,0xff3e,0xcf5d,0xdf7c,0xaf9b,0xbfba,0x8fd9,0x9ff8, |
61 | 0x6e17,0x7e36,0x4e55,0x5e74,0x2e93,0x3eb2,0x0ed1,0x1ef0 |
62 | }; |
63 | |
64 | unsigned short crc16_ccitt(const void *buf, int len) |
65 | { |
66 | int counter; |
67 | unsigned short crc = 0; |
68 | for( counter = 0; counter < len; counter++) |
69 | crc = (crc<<8) ^ crc16tab[((crc>>8) ^ *(char *)buf++)&0x00FF]; |
70 | return crc; |
71 | } |
72 | |
73 | int rxmodem(unsigned char *dest) |
74 | { |
75 | unsigned long *ptr = (unsigned long *) 0x0; |
76 | unsigned short crc, tcrc; |
77 | int i, pid = 1, len = 0; |
78 | |
79 | for (i = 0; i < 0x100000; i++) |
80 | { |
81 | *ptr = 0; |
82 | ptr++; |
83 | } |
84 | |
85 | |
86 | uart_putstr("Receiving Xmodem transfer\n"); |
87 | uart_getchar (); |
88 | for(i = 0; i < 0x20000000; i++) { asm("nop;"); } |
89 | uart_putchar ('C'); |
90 | |
91 | while(1) |
92 | { |
93 | int c, pid1, pid2; |
94 | |
95 | c = uart_getchar (); |
96 | if (c != SOH) |
97 | { |
98 | if (c == EOT) |
99 | { |
100 | uart_putchar (ACK); |
101 | return len; |
102 | } |
103 | else |
104 | return 0; |
105 | } |
106 | |
107 | pid1 = uart_getchar (); |
108 | pid2 = uart_getchar (); |
109 | |
110 | if ((pid1 & 0xFF) != (~pid2 & 0xFF)) |
111 | return 0; |
112 | |
113 | if (pid1 != pid) |
114 | return 0; |
115 | |
116 | for (i = 0; i < 130; i++) |
117 | *dest++ = uart_getchar (); |
118 | |
119 | crc = crc16_ccitt (dest - 130, 128); |
120 | tcrc = (*(dest - 2)<<8) + *(dest - 1); |
121 | if (crc != tcrc) |
122 | return 0; |
123 | else |
124 | { |
125 | pid = (pid + 1) & 0xFF; |
126 | dest -= 2; |
127 | len += 128; |
128 | uart_putchar (ACK); |
129 | } |
130 | } |
131 | } |
132 | |
133 |
Branches:
master