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annotate loadtools/sercomm.c @ 1034:405b5469abc4 default tip

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author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 12 Jun 2016 19:06:34 +0000
parents f1df95eed62c
children
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1 /*
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2 * This module handles the establishment of serial communication
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3 * with the target, i.e., the host-side termios stuff.
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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 #include "baudrate.h"
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17 char *target_ttydev;
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18 int target_fd;
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19 struct termios target_termios;
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20
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21 struct baudrate baud_rate_table[] = {
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22 /* the first listed rate will be our default */
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23 {"115200", B115200, 0},
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24 {"57600", B57600, 1},
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25 {"38400", B38400, 2},
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26 {"19200", B19200, 4},
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27 /* non-standard high baud rates "remapped" by CP2102 usb2serial IC */
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28 {"812500", B921600, -1},
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29 {"406250", B460800, -1},
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30 {"203125", B230400, -1},
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31 /* table search terminator */
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32 {NULL, B0, -1},
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33 };
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34 struct baudrate *current_baud_rate;
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35
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36 open_target_serial()
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37 {
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38 target_fd = open(target_ttydev, O_RDWR|O_NONBLOCK);
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39 if (target_fd < 0) {
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40 perror(target_ttydev);
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41 exit(1);
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42 }
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43 target_termios.c_iflag = IGNBRK;
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44 target_termios.c_oflag = 0;
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45 target_termios.c_cflag = CLOCAL|HUPCL|CREAD|CS8;
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46 target_termios.c_lflag = 0;
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47 target_termios.c_cc[VMIN] = 1;
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48 target_termios.c_cc[VTIME] = 0;
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49 /* start at B19200, as that's what we'll need to use initially */
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50 cfsetispeed(&target_termios, B19200);
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51 cfsetospeed(&target_termios, B19200);
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52 if (tcsetattr(target_fd, TCSAFLUSH, &target_termios) < 0) {
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53 perror("initial tcsetattr on target");
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54 exit(1);
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55 }
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56 return 0;
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57 }
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58
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59 struct baudrate *
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60 find_baudrate_by_name(srch_name)
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61 char *srch_name;
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62 {
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63 struct baudrate *br;
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64
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65 for (br = baud_rate_table; br->name; br++)
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66 if (!strcmp(br->name, srch_name))
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67 break;
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68 if (br->name)
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69 return(br);
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70 else {
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71 fprintf(stderr, "error: baud rate \"%s\" not known\n",
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72 srch_name);
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73 return(NULL);
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74 }
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75 }
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76
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77 switch_baud_rate(br)
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78 struct baudrate *br;
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79 {
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80 cfsetispeed(&target_termios, br->termios_code);
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81 cfsetospeed(&target_termios, br->termios_code);
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82 if (tcsetattr(target_fd, TCSAFLUSH, &target_termios) < 0) {
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83 perror("tcsetattr to switch baud rate");
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84 exit(1);
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85 }
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86 current_baud_rate = br;
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87 }