Annotation of embedaddon/ntp/libntp/icom.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Program to control ICOM radios
! 3: *
! 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.
! 7: */
! 8: #include <config.h>
! 9: #include "icom.h"
! 10: #include <unistd.h>
! 11: #include <stdio.h>
! 12: #include <fcntl.h>
! 13: #include <errno.h>
! 14:
! 15: #include "ntp_tty.h"
! 16: #include "l_stdlib.h"
! 17:
! 18: #ifdef SYS_WINNT
! 19: #undef write /* ports/winnt/include/config.h: #define write _write */
! 20: extern int async_write(int, const void *, unsigned int);
! 21: #define write(fd, data, octets) async_write(fd, data, octets)
! 22: #endif
! 23:
! 24: /*
! 25: * Packet routines
! 26: *
! 27: * These routines send a packet and receive the response. If an error
! 28: * (collision) occurs on transmit, the packet is resent. If an error
! 29: * occurs on receive (timeout), all input to the terminating FI is
! 30: * discarded and the packet is resent. If the maximum number of retries
! 31: * is not exceeded, the program returns the number of octets in the user
! 32: * buffer; otherwise, it returns zero.
! 33: *
! 34: * ICOM frame format
! 35: *
! 36: * Frames begin with a two-octet preamble PR-PR followyd by the
! 37: * transceiver address RE, controller address TX, control code CN, zero
! 38: * or more data octets DA (depending on command), and terminator FI.
! 39: * Since the bus is bidirectional, every octet output is echoed on
! 40: * input. Every valid frame sent is answered with a frame in the same
! 41: * format, but with the RE and TX fields interchanged. The CN field is
! 42: * set to NAK if an error has occurred. Otherwise, the data are returned
! 43: * in this and following DA octets. If no data are returned, the CN
! 44: * octet is set to ACK.
! 45: *
! 46: * +------+------+------+------+------+--//--+------+
! 47: * | PR | PR | RE | TX | CN | DA | FI |
! 48: * +------+------+------+------+------+--//--+------+
! 49: */
! 50: /*
! 51: * Scraps
! 52: */
! 53: #define DICOM /dev/icom/ /* ICOM port link */
! 54:
! 55: /*
! 56: * Local function prototypes
! 57: */
! 58: static void doublefreq (double, u_char *, int);
! 59:
! 60:
! 61: /*
! 62: * icom_freq(fd, ident, freq) - load radio frequency
! 63: */
! 64: int
! 65: icom_freq( /* returns 0 (ok), EIO (error) */
! 66: int fd, /* file descriptor */
! 67: int ident, /* ICOM radio identifier */
! 68: double freq /* frequency (MHz) */
! 69: )
! 70: {
! 71: u_char cmd[] = {PAD, PR, PR, 0, TX, V_SFREQ, 0, 0, 0, 0, FI,
! 72: FI};
! 73: int temp;
! 74:
! 75: cmd[3] = (char)ident;
! 76: if (ident == IC735)
! 77: temp = 4;
! 78: else
! 79: temp = 5;
! 80: doublefreq(freq * 1e6, &cmd[6], temp);
! 81: temp = write(fd, cmd, temp + 7);
! 82:
! 83: return (0);
! 84: }
! 85:
! 86:
! 87: /*
! 88: * doublefreq(freq, y, len) - double to ICOM frequency with padding
! 89: */
! 90: static void
! 91: doublefreq( /* returns void */
! 92: double freq, /* frequency */
! 93: u_char *x, /* radio frequency */
! 94: int len /* length (octets) */
! 95: )
! 96: {
! 97: int i;
! 98: char s1[16];
! 99: char *y;
! 100:
! 101: snprintf(s1, sizeof(s1), " %10.0f", freq);
! 102: y = s1 + 10;
! 103: i = 0;
! 104: while (*y != ' ') {
! 105: x[i] = *y-- & 0x0f;
! 106: x[i] = x[i] | ((*y-- & 0x0f) << 4);
! 107: i++;
! 108: }
! 109: for ( ; i < len; i++)
! 110: x[i] = 0;
! 111: x[i] = FI;
! 112: }
! 113:
! 114: /*
! 115: * icom_init() - open and initialize serial interface
! 116: *
! 117: * This routine opens the serial interface for raw transmission; that
! 118: * is, character-at-a-time, no stripping, checking or monkeying with the
! 119: * bits. For Unix, an input operation ends either with the receipt of a
! 120: * character or a 0.5-s timeout.
! 121: */
! 122: int
! 123: icom_init(
! 124: char *device, /* device name/link */
! 125: int speed, /* line speed */
! 126: int trace /* trace flags */ )
! 127: {
! 128: TTY ttyb;
! 129: int fd;
! 130: int flags;
! 131: int rc;
! 132: int saved_errno;
! 133:
! 134: flags = trace;
! 135: fd = tty_open(device, O_RDWR, 0777);
! 136: if (fd < 0)
! 137: return -1;
! 138:
! 139: rc = tcgetattr(fd, &ttyb);
! 140: if (rc < 0) {
! 141: saved_errno = errno;
! 142: close(fd);
! 143: errno = saved_errno;
! 144: return -1;
! 145: }
! 146: ttyb.c_iflag = 0; /* input modes */
! 147: ttyb.c_oflag = 0; /* output modes */
! 148: ttyb.c_cflag = IBAUD|CS8|CLOCAL; /* control modes (no read) */
! 149: ttyb.c_lflag = 0; /* local modes */
! 150: ttyb.c_cc[VMIN] = 0; /* min chars */
! 151: ttyb.c_cc[VTIME] = 5; /* receive timeout */
! 152: cfsetispeed(&ttyb, (u_int)speed);
! 153: cfsetospeed(&ttyb, (u_int)speed);
! 154: rc = tcsetattr(fd, TCSANOW, &ttyb);
! 155: if (rc < 0) {
! 156: saved_errno = errno;
! 157: close(fd);
! 158: errno = saved_errno;
! 159: return -1;
! 160: }
! 161: return (fd);
! 162: }
! 163:
! 164: /* end program */
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