1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
/*
* Ymodem send routine. Only supports 1K blocks and CRC mode.
*/
#include <string.h>
#include <stdio.h>
#include <inttypes.h>
#include "backend.h"
#include "serial.h"
enum {
SOH = 0x01,
STX = 0x02,
EOT = 0x04,
ACK = 0x06,
NAK = 0x15,
CAN = 0x18,
};
struct ymodem_state {
struct serial_if serial;
unsigned int seq, blocks;
};
/*
* Append a CRC16 to a block
*/
static void add_crc16(uint8_t * blk, int len)
{
static const uint16_t crctab[256] = {
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
};
uint16_t crc = 0;
while (len--)
crc = crctab[(crc >> 8) ^ *blk++] ^ crc << 8;
*blk++ = crc >> 8;
*blk = crc;
}
static void send_ack(struct ymodem_state *ym, const uint8_t *blk,
size_t bytes);
static void send_ack_blk(struct ymodem_state *ym, uint8_t *blk)
{
printf("Sending block %u/%u...\r", ym->seq, ym->blocks);
blk[0] = STX;
blk[1] = ym->seq++;
blk[2] = ~blk[1];
add_crc16(blk+3, 1024);
send_ack(ym, blk, 1024+5);
}
static void send_ack(struct ymodem_state *ym, const uint8_t *blk, size_t bytes)
{
uint8_t ack_buf;
do {
serial_write(&ym->serial, blk, bytes);
do {
serial_read(&ym->serial, &ack_buf, 1);
} while (ack_buf != ACK && ack_buf != NAK);
} while (ack_buf == NAK);
}
static int be_ymodem_write(struct backend *be)
{
static const uint8_t eot_buf = EOT;
uint8_t ack_buf;
uint8_t blk_buf[1024 + 5];
struct ymodem_state ym;
const char *buf;
size_t len, chunk;
const char ymodem_banner[] = "Now begin Ymodem download...\r\n";
buf = be->outbuf;
len = be->zbytes;
putchar('\n');
ym.seq = 0;
ym.blocks = (len+1023)/1024;
/* Initialize serial port */
if (serial_init(&ym.serial, &be->argv[1]))
return -1;
/* Write banner */
printf("Writing banner...\n");
serial_write(&ym.serial, ymodem_banner, sizeof ymodem_banner-1);
/* Wait for initial handshake */
printf("Waiting for handshake...\n");
do {
serial_read(&ym.serial, &ack_buf, 1);
} while (ack_buf != 'C');
/* Send filename block */
memset(blk_buf, 0, sizeof blk_buf);
snprintf((char *)blk_buf+3, 1024, "%s%c%zu 0%o 0644",
be->argv[0], 0, be->zbytes, be->now);
send_ack_blk(&ym, blk_buf);
while (len) {
chunk = len < 1024 ? len : 1024;
memcpy(blk_buf+3, buf, chunk);
if (chunk < 1024)
memset(blk_buf+3+chunk, 0x1a, 1024-chunk);
send_ack_blk(&ym, blk_buf);
buf += chunk;
len -= chunk;
}
printf("\nSending EOT...\n");
send_ack(&ym, &eot_buf, 1);
printf("Waiting for handshake...\n");
do {
serial_read(&ym.serial, &ack_buf, 1);
} while (ack_buf != 'C');
ym.seq = 0;
printf("Sending batch termination block...\n");
memset(blk_buf+3, 0, 1024);
send_ack_blk(&ym, blk_buf);
printf("Cleaning up... \n");
serial_cleanup(&ym.serial);
return 0;
}
struct backend be_ymodem = {
.name = "ymodem",
.helpmsg = "filename [port [speed]]",
.minargs = 1,
.write = be_ymodem_write,
};
|
