1/*	$NetBSD: icom.c,v 1.10 2020/05/25 20:47:24 christos Exp $	*/
2
3/*
4 * Program to control ICOM radios
5 *
6 * This is a ripoff of the utility routines in the ICOM software
7 * distribution. The only function provided is to load the radio
8 * frequency. All other parameters must be manually set before use.
9 */
10#include <config.h>
11#include <ntp_stdlib.h>
12#include <ntp_tty.h>
13#include <l_stdlib.h>
14#include <icom.h>
15
16#include <unistd.h>
17#include <stdio.h>
18#include <fcntl.h>
19#include <errno.h>
20
21
22#ifdef SYS_WINNT
23#undef write	/* ports/winnt/include/config.h: #define write _write */
24extern int async_write(int, const void *, unsigned int);
25#define write(fd, data, octets)	async_write(fd, data, octets)
26#endif
27
28/*
29 * Packet routines
30 *
31 * These routines send a packet and receive the response. If an error
32 * (collision) occurs on transmit, the packet is resent. If an error
33 * occurs on receive (timeout), all input to the terminating FI is
34 * discarded and the packet is resent. If the maximum number of retries
35 * is not exceeded, the program returns the number of octets in the user
36 * buffer; otherwise, it returns zero.
37 *
38 * ICOM frame format
39 *
40 * Frames begin with a two-octet preamble PR-PR followyd by the
41 * transceiver address RE, controller address TX, control code CN, zero
42 * or more data octets DA (depending on command), and terminator FI.
43 * Since the bus is bidirectional, every octet output is echoed on
44 * input. Every valid frame sent is answered with a frame in the same
45 * format, but with the RE and TX fields interchanged. The CN field is
46 * set to NAK if an error has occurred. Otherwise, the data are returned
47 * in this and following DA octets. If no data are returned, the CN
48 * octet is set to ACK.
49 *
50 *	+------+------+------+------+------+--//--+------+
51 *	|  PR  |  PR  |  RE  |  TX  |  CN  |  DA  |  FI  |
52 *	+------+------+------+------+------+--//--+------+
53 */
54/*
55 * Scraps
56 */
57#define DICOM /dev/icom/	/* ICOM port link */
58
59/*
60 * Local function prototypes
61 */
62static void doublefreq		(double, u_char *, int);
63
64
65/*
66 * icom_freq(fd, ident, freq) - load radio frequency
67 *
68 * returns:
69 *  0 (ok)
70 * -1 (error)
71 *  1 (short write to device)
72 */
73int
74icom_freq(
75	int fd,			/* file descriptor */
76	int ident,		/* ICOM radio identifier */
77	double freq		/* frequency (MHz) */
78	)
79{
80	u_char cmd[] = {PAD, PR, PR, 0, TX, V_SFREQ, 0, 0, 0, 0, FI,
81	    FI};
82	int temp;
83	int rc;
84
85	cmd[3] = (char)ident;
86	if (ident == IC735)
87		temp = 4;
88	else
89		temp = 5;
90	doublefreq(freq * 1e6, &cmd[6], temp);
91	rc = write(fd, cmd, temp + 7);
92	if (rc == -1) {
93		msyslog(LOG_ERR, "icom_freq: write() failed: %m");
94		return -1;
95	} else if (rc != temp + 7) {
96		msyslog(LOG_ERR, "icom_freq: only wrote %d of %d bytes.",
97			rc, temp+7);
98		return 1;
99	}
100
101	return 0;
102}
103
104
105/*
106 * doublefreq(freq, y, len) - double to ICOM frequency with padding
107 */
108static void
109doublefreq(			/* returns void */
110	double freq,		/* frequency */
111	u_char *x,		/* radio frequency */
112	int len			/* length (octets) */
113	)
114{
115	int i;
116	char s1[16];
117	char *y;
118
119	snprintf(s1, sizeof(s1), " %10.0f", freq);
120	y = s1 + 10;
121	i = 0;
122	while (*y != ' ') {
123		x[i] = *y-- & 0x0f;
124		x[i] = x[i] | ((*y-- & 0x0f) << 4);
125		i++;
126	}
127	for ( ; i < len; i++)
128		x[i] = 0;
129	x[i] = FI;
130}
131
132/*
133 * icom_init() - open and initialize serial interface
134 *
135 * This routine opens the serial interface for raw transmission; that
136 * is, character-at-a-time, no stripping, checking or monkeying with the
137 * bits. For Unix, an input operation ends either with the receipt of a
138 * character or a 0.5-s timeout.
139 */
140int
141icom_init(
142	const char *device,	/* device name/link */
143	int speed,		/* line speed */
144	int trace		/* trace flags */	)
145{
146	TTY ttyb;
147	int fd;
148	int rc;
149	int saved_errno;
150
151	fd = tty_open(device, O_RDWR, 0777);
152	if (fd < 0)
153		return -1;
154
155	rc = tcgetattr(fd, &ttyb);
156	if (rc < 0) {
157		saved_errno = errno;
158		close(fd);
159		errno = saved_errno;
160		return -1;
161	}
162	ttyb.c_iflag = 0;	/* input modes */
163	ttyb.c_oflag = 0;	/* output modes */
164	ttyb.c_cflag = IBAUD|CS8|CLOCAL; /* control modes  (no read) */
165	ttyb.c_lflag = 0;	/* local modes */
166	ttyb.c_cc[VMIN] = 0;	/* min chars */
167	ttyb.c_cc[VTIME] = 5;	/* receive timeout */
168	cfsetispeed(&ttyb, (u_int)speed);
169	cfsetospeed(&ttyb, (u_int)speed);
170	rc = tcsetattr(fd, TCSANOW, &ttyb);
171	if (rc < 0) {
172		saved_errno = errno;
173		close(fd);
174		errno = saved_errno;
175		return -1;
176	}
177	return (fd);
178}
179
180/* end program */
181