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.
19 #define BMAX 50 /* max command length */
20 #define DICOM /dev/icom/ /* ICOM port link */
25 #define S_IDLE 0 /* idle */
26 #define S_HDR 1 /* header */
27 #define S_TX 2 /* address */
28 #define S_DATA 3 /* data */
29 #define S_ERROR 4 /* error */
32 * Local function prototypes
34 static void doublefreq P((double, u_char *, int));
35 static int sndpkt P((int, int, u_char *, u_char *));
36 static int sndoctet P((int, int));
37 static int rcvoctet P((int));
42 static int flags; /* trace flags */
43 static int state; /* fsa state */
47 * icom_freq(fd, ident, freq) - load radio frequency
50 icom_freq( /* returns 0 (ok), EIO (error) */
51 int fd, /* file descriptor */
52 int ident, /* ICOM radio identifier */
53 double freq /* frequency (MHz) */
56 u_char cmd[BMAX], rsp[BMAX];
63 doublefreq(freq * 1e6, &cmd[1], temp);
64 temp = sndpkt(fd, ident, cmd, rsp);
65 if (temp < 1 || rsp[0] != ACK)
72 * doublefreq(freq, y, len) - double to ICOM frequency with padding
75 doublefreq( /* returns void */
76 double freq, /* frequency */
77 u_char *x, /* radio frequency */
78 int len /* length (octets) */
85 sprintf(s1, " %10.0f", freq);
90 x[i] = x[i] | ((*y-- & 0x0f) << 4);
102 * These routines send a packet and receive the response. If an error
103 * (collision) occurs on transmit, the packet is resent. If an error
104 * occurs on receive (timeout), all input to the terminating FI is
105 * discarded and the packet is resent. If the maximum number of retries
106 * is not exceeded, the program returns the number of octets in the user
107 * buffer; otherwise, it returns zero.
111 * Frames begin with a two-octet preamble PR-PR followyd by the
112 * transceiver address RE, controller address TX, control code CN, zero
113 * or more data octets DA (depending on command), and terminator FI.
114 * Since the bus is bidirectional, every octet output is echoed on
115 * input. Every valid frame sent is answered with a frame in the same
116 * format, but with the RE and TX fields interchanged. The CN field is
117 * set to NAK if an error has occurred. Otherwise, the data are returned
118 * in this and following DA octets. If no data are returned, the CN
119 * octet is set to ACK.
121 * +------+------+------+------+------+--//--+------+
122 * | PR | PR | RE | TX | CN | DA | FI |
123 * +------+------+------+------+------+--//--+------+
126 * icom_open() - open and initialize serial interface
128 * This routine opens the serial interface for raw transmission; that
129 * is, character-at-a-time, no stripping, checking or monkeying with the
130 * bits. For Unix, an input operation ends either with the receipt of a
131 * character or a 0.5-s timeout.
135 char *device, /* device name/link */
136 int speed, /* line speed */
137 int trace /* trace flags */ )
143 fd = open(device, O_RDWR, 0777);
146 tcgetattr(fd, &ttyb);
147 ttyb.c_iflag = 0; /* input modes */
148 ttyb.c_oflag = 0; /* output modes */
149 ttyb.c_cflag = IBAUD|CS8|CREAD|CLOCAL; /* control modes */
150 ttyb.c_lflag = 0; /* local modes */
151 ttyb.c_cc[VMIN] = 0; /* min chars */
152 ttyb.c_cc[VTIME] = 5; /* receive timeout */
153 cfsetispeed(&ttyb, (u_int)speed);
154 cfsetospeed(&ttyb, (u_int)speed);
155 tcsetattr(fd, TCSANOW, &ttyb);
161 * sndpkt(r, x, y) - send packet and receive response
163 * This routine sends a command frame, which consists of all except the
164 * preamble octets PR-PR. It then listens for the response frame and
165 * returns the payload to the caller. The routine checks for correct
166 * response header format; that is, the length of the response vector
167 * returned to the caller must be at least 2 and the RE and TX octets
168 * must be interchanged; otherwise, the operation is retried up to
169 * the number of times specified in a global variable.
171 * The trace function, which is enabled by the P_TRACE bit of the global
172 * flags variable, prints all characters received or echoed on the bus
173 * preceded by a T (transmit) or R (receive). The P_ERMSG bit of the
174 * flags variable enables printing of bus error messages.
176 * Note that the first octet sent is a PAD in order to allow time for
177 * the radio to flush its receive buffer after sending the previous
178 * response. Even with this precaution, some of the older radios
179 * occasionally fail to receive a command and it has to be sent again.
182 sndpkt( /* returns octet count */
183 int fd, /* file descriptor */
184 int r, /* radio address */
185 u_char *cmd, /* command vector */
186 u_char *rsp /* response vector */
191 (void)tcflush(fd, TCIOFLUSH);
192 for (i = 0; i < RETRY; i++) {
200 sndoctet(fd, PAD); /* send header */
205 for (j = 0; j < BMAX; j++) { /* send body */
206 if (sndoctet(fd, cmd[j]) == FI)
209 while (rcvoctet(fd) != FI); /* purge echos */
210 if (cmd[0] == V_FREQT || cmd[0] == V_MODET)
211 return (0); /* shortcut for broadcast */
214 * Receive packet. First, delete all characters
215 * preceeding a PR, then discard all PRs. Check that the
216 * RE and TX fields are correctly interchanged, then
217 * copy the remaining data and FI to the user buffer.
222 while ((temp = rcvoctet(fd)) != FI) {
234 } else if (temp != TX) {
257 "icom: buffer overrun\n");
261 rsp[j++] = (u_char)temp;
276 printf("icom: retries exceeded\n");
284 * These routines read and write octets on the bus. In case of receive
285 * timeout a FI code is returned. In case of output collision (echo
286 * does not match octet sent), the remainder of the collision frame
287 * (including the trailing FI) is discarded.
290 * sndoctet(fd, x) - send octet
293 sndoctet( /* returns octet */
294 int fd, /* file descriptor */
307 * rcvoctet(fd) - receive octet
310 rcvoctet( /* returns octet */
311 int fd /* file descriptor */
316 if (read(fd, &y, 1) < 1)
317 y = FI; /* come here if timeout */
318 if (flags & P_TRACE && y != PAD)