aboutsummaryrefslogtreecommitdiffstats
path: root/memdump/ymsend.c
blob: 9d8929419ea2ccd7ffc28b725324bce45dcfe295 (plain)
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
/*
 * Ymodem send routine.  Only supports 1K blocks and CRC mode.
 */

#include <string.h>
#include <stdio.h>
#include "ymsend.h"

enum {
    SOH = 0x01,
    STX = 0x02,
    EOT = 0x04,
    ACK = 0x06,
    NAK = 0x15,
    CAN = 0x18,
};

/*
 * 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_blk(struct serial_if *sif, const void *data, size_t bytes)
{
    uint8_t ack_buf;

    if (bytes)
	sif->write(sif, data, bytes);

    do {
	do {
	    sif->read(sif, &ack_buf, 1);
	} while (ack_buf != ACK && ack_buf != NAK);
    } while (ack_buf == NAK);
}

static const uint8_t eot_buf = EOT;

void send_ymodem(struct serial_if *sif, struct file_info *fileinfo,
		 void (*gen_data) (void *, size_t, struct file_info *, size_t))
{
    uint8_t ack_buf, blk_buf[1024 + 5], *np, *q;
    const char *p;
    size_t len, lx, pos;
    int blk;

    /* Wait for initial handshake */
    printf("Waiting for handshake...\n");
    do {
	sif->read(sif, &ack_buf, 1);
    } while (ack_buf != 'C');

    /* Send initial batch header (filename, length etc.) */
    q = blk_buf + 3;
    p = fileinfo->name;
    while (*p)
	*q++ = *p++;
    *q++ = '\0';

    lx = len = fileinfo->size;
    do {
	q++;
	lx /= 10;
    } while (lx);

    np = q;
    lx = len;
    do {
	*--np = (lx % 10) + '0';
	lx /= 10;
    } while (lx);

    while (q < blk_buf + 1024 + 3)
	*q++ = 0;

    blk = 0;
    pos = 0;
    do {
	if (blk != 0) {
	    gen_data(blk_buf + 3, 1024, fileinfo, pos);
	    pos += 1024;
	    len = (len < 1024) ? 0 : len - 1024;
	}

	blk_buf[0] = STX;
	blk_buf[1] = blk;
	blk_buf[2] = ~blk;
	add_crc16(blk_buf + 3, 1024);

	printf("Sending block %d...\r", blk);
	send_ack_blk(sif, blk_buf, 1024 + 5);

	blk++;
    } while (len);

    printf("\nSending EOT...\n");
    send_ack_blk(sif, &eot_buf, 1);
    printf("Done.\n");
}

void end_ymodem(struct serial_if *sif)
{
    uint8_t ack_buf;
    uint8_t blk_buf[128 + 5];

    /* Wait for initial handshake */
    printf("END: Waiting for handshake...\n");
    do {
	sif->read(sif, &ack_buf, 1);
    } while (ack_buf != 'C');

    memset(blk_buf, 0, sizeof blk_buf);
    blk_buf[0] = SOH;
    blk_buf[1] = 0;
    blk_buf[2] = 0xff;
    add_crc16(blk_buf + 3, 128);
    printf("Sending block 0...\n");
    send_ack_blk(sif, &blk_buf, 128 + 5);

    printf("Sending EOT...\n");
    sif->write(sif, &eot_buf, 1);
    /* rb doesn't ack the EOT for an end batch transfer. */
    printf("Done.\n");
}