2 * Program to control ICOM radios
4 * This is a ripoff of the utility routines in the ICOM software
5 * distribution. The only function provided is to load the radio
6 * frequency. All other parameters must be manually set before use.
14 #endif /* HAVE_TERMIOS_H */
15 #ifdef HAVE_SYS_TERMIOS_H
16 # include <sys/termios.h>
17 #endif /* HAVE_SYS_TERMIOS_H */
25 #define BMAX 50 /* max command length */
26 #define DICOM /dev/icom/ /* ICOM port link */
31 #define S_IDLE 0 /* idle */
32 #define S_HDR 1 /* header */
33 #define S_TX 2 /* address */
34 #define S_DATA 3 /* data */
35 #define S_ERROR 4 /* error */
38 * Local function prototypes
40 static void doublefreq P((double, u_char *, int));
41 static int sndpkt P((int, int, u_char *, u_char *));
42 static int sndoctet P((int, int));
43 static int rcvoctet P((int));
48 static int flags; /* trace flags */
49 static int state; /* fsa state */
53 * icom_freq(fd, ident, freq) - load radio frequency
56 icom_freq( /* returns 0 (ok), EIO (error) */
57 int fd, /* file descriptor */
58 int ident, /* ICOM radio identifier */
59 double freq /* frequency (MHz) */
62 u_char cmd[BMAX], rsp[BMAX];
69 doublefreq(freq * 1e6, &cmd[1], temp);
70 temp = sndpkt(fd, ident, cmd, rsp);
71 if (temp < 1 || rsp[0] != ACK)
78 * doublefreq(freq, y, len) - double to ICOM frequency with padding
81 doublefreq( /* returns void */
82 double freq, /* frequency */
83 u_char *x, /* radio frequency */
84 int len /* length (octets) */
91 sprintf(s1, " %10.0f", freq);
96 x[i] = x[i] | ((*y-- & 0x0f) << 4);
108 * These routines send a packet and receive the response. If an error
109 * (collision) occurs on transmit, the packet is resent. If an error
110 * occurs on receive (timeout), all input to the terminating FI is
111 * discarded and the packet is resent. If the maximum number of retries
112 * is not exceeded, the program returns the number of octets in the user
113 * buffer; otherwise, it returns zero.
117 * Frames begin with a two-octet preamble PR-PR followyd by the
118 * transceiver address RE, controller address TX, control code CN, zero
119 * or more data octets DA (depending on command), and terminator FI.
120 * Since the bus is bidirectional, every octet output is echoed on
121 * input. Every valid frame sent is answered with a frame in the same
122 * format, but with the RE and TX fields interchanged. The CN field is
123 * set to NAK if an error has occurred. Otherwise, the data are returned
124 * in this and following DA octets. If no data are returned, the CN
125 * octet is set to ACK.
127 * +------+------+------+------+------+--//--+------+
128 * | PR | PR | RE | TX | CN | DA | FI |
129 * +------+------+------+------+------+--//--+------+
132 * icom_open() - open and initialize serial interface
134 * This routine opens the serial interface for raw transmission; that
135 * is, character-at-a-time, no stripping, checking or monkeying with the
136 * bits. For Unix, an input operation ends either with the receipt of a
137 * character or a 0.5-s timeout.
141 char *device, /* device name/link */
142 int speed, /* line speed */
143 int trace /* trace flags */ )
149 fd = open(device, O_RDWR, 0777);
152 tcgetattr(fd, &ttyb);
153 ttyb.c_iflag = 0; /* input modes */
154 ttyb.c_oflag = 0; /* output modes */
155 ttyb.c_cflag = IBAUD|CS8|CREAD|CLOCAL; /* control modes */
156 ttyb.c_lflag = 0; /* local modes */
157 ttyb.c_cc[VMIN] = 0; /* min chars */
158 ttyb.c_cc[VTIME] = 5; /* receive timeout */
159 cfsetispeed(&ttyb, (u_int)speed);
160 cfsetospeed(&ttyb, (u_int)speed);
161 tcsetattr(fd, TCSANOW, &ttyb);
167 * sndpkt(r, x, y) - send packet and receive response
169 * This routine sends a command frame, which consists of all except the
170 * preamble octets PR-PR. It then listens for the response frame and
171 * returns the payload to the caller. The routine checks for correct
172 * response header format; that is, the length of the response vector
173 * returned to the caller must be at least 2 and the RE and TX octets
174 * must be interchanged; otherwise, the operation is retried up to
175 * the number of times specified in a global variable.
177 * The trace function, which is enabled by the P_TRACE bit of the global
178 * flags variable, prints all characters received or echoed on the bus
179 * preceded by a T (transmit) or R (receive). The P_ERMSG bit of the
180 * flags variable enables printing of bus error messages.
182 * Note that the first octet sent is a PAD in order to allow time for
183 * the radio to flush its receive buffer after sending the previous
184 * response. Even with this precaution, some of the older radios
185 * occasionally fail to receive a command and it has to be sent again.
188 sndpkt( /* returns octet count */
189 int fd, /* file descriptor */
190 int r, /* radio address */
191 u_char *cmd, /* command vector */
192 u_char *rsp /* response vector */
197 (void)tcflush(fd, TCIOFLUSH);
198 for (i = 0; i < RETRY; i++) {
206 sndoctet(fd, PAD); /* send header */
211 for (j = 0; j < BMAX; j++) { /* send body */
212 if (sndoctet(fd, cmd[j]) == FI)
215 while (rcvoctet(fd) != FI); /* purge echos */
216 if (cmd[0] == V_FREQT || cmd[0] == V_MODET)
217 return (0); /* shortcut for broadcast */
220 * Receive packet. First, delete all characters
221 * preceeding a PR, then discard all PRs. Check that the
222 * RE and TX fields are correctly interchanged, then
223 * copy the remaining data and FI to the user buffer.
228 while ((temp = rcvoctet(fd)) != FI) {
240 } else if (temp != TX) {
263 "icom: buffer overrun\n");
267 rsp[j++] = (u_char)temp;
282 printf("icom: retries exceeded\n");
290 * These routines read and write octets on the bus. In case of receive
291 * timeout a FI code is returned. In case of output collision (echo
292 * does not match octet sent), the remainder of the collision frame
293 * (including the trailing FI) is discarded.
296 * sndoctet(fd, x) - send octet
299 sndoctet( /* returns octet */
300 int fd, /* file descriptor */
313 * rcvoctet(fd) - receive octet
316 rcvoctet( /* returns octet */
317 int fd /* file descriptor */
322 if (read(fd, &y, 1) < 1)
323 y = FI; /* come here if timeout */
324 if (flags & P_TRACE && y != PAD)