summaryrefslogtreecommitdiffstats
path: root/serial.c
blob: 9446ce314a5fc17fe340719ee9639950faf73f8a (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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
/*
 * This file is part of the flashrom project.
 *
 * Copyright (C) 2009 Urja Rannikko <urjaman@gmail.com>
 * Copyright (C) 2009,2010 Carl-Daniel Hailfinger
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
#include <inttypes.h>
#ifdef _WIN32
#include <conio.h>
#else
#include <termios.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#endif
#include "flash.h"
#include "programmer.h"

fdtype sp_fd;

void __attribute__((noreturn)) sp_die(char *msg)
{
	perror(msg);
	exit(1);
}

#ifndef _WIN32
struct baudentry {
	int flag;
	unsigned int baud;
};

/* I'd like if the C preprocessor could have directives in macros */
#define BAUDENTRY(baud) { B##baud, baud },
static const struct baudentry sp_baudtable[] = {
	BAUDENTRY(9600)
	BAUDENTRY(19200)
	BAUDENTRY(38400)
	BAUDENTRY(57600)
	BAUDENTRY(115200)
#ifdef B230400
	BAUDENTRY(230400)
#endif
#ifdef B460800
	BAUDENTRY(460800)
#endif
#ifdef B500000
	BAUDENTRY(500000)
#endif
#ifdef B576000
	BAUDENTRY(576000)
#endif
#ifdef B921600
	BAUDENTRY(921600)
#endif
#ifdef B1000000
	BAUDENTRY(1000000)
#endif
#ifdef B1152000
	BAUDENTRY(1152000)
#endif
#ifdef B1500000
	BAUDENTRY(1500000)
#endif
#ifdef B2000000
	BAUDENTRY(2000000)
#endif
#ifdef B2500000
	BAUDENTRY(2500000)
#endif
#ifdef B3000000
	BAUDENTRY(3000000)
#endif
#ifdef B3500000
	BAUDENTRY(3500000)
#endif
#ifdef B4000000
	BAUDENTRY(4000000)
#endif
	{0, 0}			/* Terminator */
};
#endif

fdtype sp_openserport(char *dev, unsigned int baud)
{
#ifdef _WIN32
	HANDLE fd;
	char *dev2 = dev;
	if ((strlen(dev) > 3) && (tolower((unsigned char)dev[0]) == 'c') &&
	    (tolower((unsigned char)dev[1]) == 'o') &&
	    (tolower((unsigned char)dev[2]) == 'm')) {
		dev2 = malloc(strlen(dev) + 5);
		if (!dev2) {
			msg_perr("Error: Out of memory: %s\n", strerror(errno));
			return SER_INV_FD;
		}
		strcpy(dev2, "\\\\.\\");
		strcpy(dev2 + 4, dev);
	}
	fd = CreateFile(dev2, GENERIC_READ | GENERIC_WRITE, 0, NULL,
			OPEN_EXISTING, 0, NULL);
	if (dev2 != dev)
		free(dev2);
	if (fd == INVALID_HANDLE_VALUE) {
		msg_perr("Error: cannot open serial port: %s\n", strerror(errno));
		return SER_INV_FD;
	}
	DCB dcb;
	if (!GetCommState(fd, &dcb)) {
		msg_perr("Error: Could not fetch serial port configuration: %s\n", strerror(errno));
		return SER_INV_FD;
	}
	switch (baud) {
		case 9600: dcb.BaudRate = CBR_9600; break;
		case 19200: dcb.BaudRate = CBR_19200; break;
		case 38400: dcb.BaudRate = CBR_38400; break;
		case 57600: dcb.BaudRate = CBR_57600; break;
		case 115200: dcb.BaudRate = CBR_115200; break;
		default: msg_perr("Error: Could not set baud rate: %s\n", strerror(errno));
			 return SER_INV_FD;
	}
	dcb.ByteSize = 8;
	dcb.Parity = NOPARITY;
	dcb.StopBits = ONESTOPBIT;
	if (!SetCommState(fd, &dcb)) {
		msg_perr("Error: Could not change serial port configuration: %s\n", strerror(errno));
		return SER_INV_FD;
	}
	return fd;
#else
	struct termios options;
	int fd, i;
	fd = open(dev, O_RDWR | O_NOCTTY | O_NDELAY);
	if (fd < 0) {
		msg_perr("Error: cannot open serial port: %s\n", strerror(errno));
		return SER_INV_FD;
	}
	fcntl(fd, F_SETFL, 0);
	tcgetattr(fd, &options);
	for (i = 0;; i++) {
		if (sp_baudtable[i].baud == 0) {
			close(fd);
			msg_perr("Error: cannot configure for baudrate %d\n", baud);
			return SER_INV_FD;
		}
		if (sp_baudtable[i].baud == baud) {
			cfsetispeed(&options, sp_baudtable[i].flag);
			cfsetospeed(&options, sp_baudtable[i].flag);
			break;
		}
	}
	options.c_cflag &= ~(PARENB | CSTOPB | CSIZE | CRTSCTS);
	options.c_cflag |= (CS8 | CLOCAL | CREAD);
	options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
	options.c_iflag &= ~(IXON | IXOFF | IXANY | ICRNL | IGNCR | INLCR);
	options.c_oflag &= ~OPOST;
	tcsetattr(fd, TCSANOW, &options);
	return fd;
#endif
}

void sp_set_pin(enum SP_PIN pin, int val) {
#ifdef _WIN32
	DWORD ctl;

	if(pin == PIN_TXD) {
		ctl = val ? SETBREAK: CLRBREAK;
	}
	else if(pin == PIN_DTR) {
		ctl = val ? SETDTR: CLRDTR;
	}
	else {
		ctl = val ? SETRTS: CLRRTS;
	}
	EscapeCommFunction(sp_fd, ctl);
#else
	int ctl, s;

	if(pin == PIN_TXD) {
		ioctl(sp_fd, val ? TIOCSBRK : TIOCCBRK, 0);
	}
	else {
		s = (pin == PIN_DTR) ? TIOCM_DTR : TIOCM_RTS;
		ioctl(sp_fd, TIOCMGET, &ctl);

		if (val) {
			ctl |= s;
		}
		else {
			ctl &= ~s;
		}
		ioctl(sp_fd, TIOCMSET, &ctl);
	}
#endif
}

int sp_get_pin(enum SP_PIN pin) {
	int s;
#ifdef _WIN32
	DWORD ctl;

	s = (pin == PIN_CTS) ? MS_CTS_ON : MS_DSR_ON;
	GetCommModemStatus(sp_fd, &ctl);
#else
	int ctl;
	s = (pin == PIN_CTS) ? TIOCM_CTS : TIOCM_DSR;
	ioctl(sp_fd, TIOCMGET, &ctl);
#endif

	return ((ctl & s) ? 1 : 0);

}

void sp_flush_incoming(void)
{
#ifdef _WIN32
	PurgeComm(sp_fd, PURGE_RXCLEAR);
#else
	/* FIXME: error handling */
	tcflush(sp_fd, TCIFLUSH);
#endif
	return;
}

int serialport_shutdown(void *data)
{
#ifdef _WIN32
	CloseHandle(sp_fd);
#else
	close(sp_fd);
#endif
	return 0;
}

int serialport_write(unsigned char *buf, unsigned int writecnt)
{
#ifdef _WIN32
	DWORD tmp = 0;
#else
	ssize_t tmp = 0;
#endif
	unsigned int empty_writes = 250; /* results in a ca. 125ms timeout */

	while (writecnt > 0) {
#ifdef _WIN32
		WriteFile(sp_fd, buf, writecnt, &tmp, NULL);
#else
		tmp = write(sp_fd, buf, writecnt);
#endif
		if (tmp == -1) {
			msg_perr("Serial port write error!\n");
			return 1;
		}
		if (!tmp) {
			msg_pdbg2("Empty write\n");
			empty_writes--;
			programmer_delay(500);
			if (empty_writes == 0) {
				msg_perr("Serial port is unresponsive!\n");
				return 1;
			}
		}
		writecnt -= tmp;
		buf += tmp;
	}

	return 0;
}

int serialport_read(unsigned char *buf, unsigned int readcnt)
{
#ifdef _WIN32
	DWORD tmp = 0;
#else
	ssize_t tmp = 0;
#endif

	while (readcnt > 0) {
#ifdef _WIN32
		ReadFile(sp_fd, buf, readcnt, &tmp, NULL);
#else
		tmp = read(sp_fd, buf, readcnt);
#endif
		if (tmp == -1) {
			msg_perr("Serial port read error!\n");
			return 1;
		}
		if (!tmp)
			msg_pdbg("Empty read\n");
		readcnt -= tmp;
		buf += tmp;
	}

	return 0;
}