FreeCalypso > hg > freecalypso-tools

annotate rvinterf/old/before-rvinterf/openport.c @ 854:74331b35b1da

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ringtools/examples/ring.pwt: PWT equivalent of ring.buz
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 09 Nov 2021 16:39:52 +0000
parents e7502631a0f9
children
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1 /*
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2 * This module takes care of opening the serial port and setting the
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3 * proper "raw" termios modes, including the baud rate.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <sys/file.h>
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8 #include <sys/ioctl.h>
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9 #include <termios.h>
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12 #include <string.h>
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13 #include <strings.h>
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14 #include <unistd.h>
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15
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16 int target_fd;
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17 char *baudrate_name = "115200";
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18
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19 static struct baudrate {
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20 char *name;
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21 speed_t termios_code;
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22 } baud_rate_table[] = {
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23 {"19200", B19200},
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24 {"38400", B38400},
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25 {"57600", B57600},
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26 {"115200", B115200},
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27 /* non-standard high baud rates "remapped" by CP2102 usb2serial IC */
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28 {"203125", B230400},
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29 {"406250", B460800},
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30 {"812500", B921600},
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31 /* table search terminator */
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32 {NULL, B0}
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33 };
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34
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35 static speed_t
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36 get_baud_rate()
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37 {
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38 struct baudrate *br;
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39
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40 for (br = baud_rate_table; br->name; br++)
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41 if (!strcmp(br->name, baudrate_name))
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42 break;
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43 if (!br->name) {
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44 fprintf(stderr, "baud rate \"%s\" unknown/unsupported\n",
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45 baudrate_name);
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46 exit(1);
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47 }
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48 return br->termios_code;
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49 }
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50
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51 open_target_serial(ttydev)
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52 char *ttydev;
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53 {
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54 struct termios target_termios;
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55 speed_t br_code;
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56
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57 br_code = get_baud_rate();
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58 target_fd = open(ttydev, O_RDWR|O_NONBLOCK);
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59 if (target_fd < 0) {
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60 perror(ttydev);
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61 exit(1);
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62 }
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63 target_termios.c_iflag = IGNBRK;
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64 target_termios.c_oflag = 0;
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65 target_termios.c_cflag = CLOCAL|HUPCL|CREAD|CS8;
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66 target_termios.c_lflag = 0;
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67 target_termios.c_cc[VMIN] = 1;
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68 target_termios.c_cc[VTIME] = 0;
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69 cfsetispeed(&target_termios, br_code);
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70 cfsetospeed(&target_termios, br_code);
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71 if (tcsetattr(target_fd, TCSAFLUSH, &target_termios) < 0) {
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72 perror("initial tcsetattr on target");
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73 exit(1);
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74 }
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75 return 0;
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76 }
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77
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78 set_serial_nonblock(state)
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79 int state;
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80 {
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81 ioctl(target_fd, FIONBIO, &state);
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82 }