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annotate loadtools/sercomm.c @ 49:54392d1ea474

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loadtools: first beginnings for the baud rate switching logic
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sun, 23 Jun 2013 02:53:16 +0000
parents fea204bc7674
children f1df95eed62c
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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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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 <unistd.h>
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13 #include "baudrate.h"
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15 char *target_ttydev;
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16 int target_fd;
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17 struct termios target_termios;
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18
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19 struct baudrate baud_rate_table[] = {
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20 /* the first listed rate will be our default */
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21 {"115200", B115200, 0},
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22 {"57600", B57600, 1},
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23 {"38400", B38400, 2},
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24 {"19200", B19200, 4},
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25 /* non-standard high baud rates "remapped" by CP2102 usb2serial IC */
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26 {"812500", B921600, -1},
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27 {"406250", B460800, -1},
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28 {"203125", B230400, -1},
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29 /* table search terminator */
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30 {NULL, B0, -1},
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31 };
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32 struct baudrate *current_baud_rate;
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33
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34 open_target_serial()
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35 {
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36 target_fd = open(target_ttydev, O_RDWR|O_NONBLOCK);
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37 if (target_fd < 0) {
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38 perror(target_ttydev);
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39 exit(1);
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40 }
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41 target_termios.c_iflag = IGNBRK;
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42 target_termios.c_oflag = 0;
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43 target_termios.c_cflag = CLOCAL|HUPCL|CREAD|CS8;
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44 target_termios.c_lflag = 0;
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45 target_termios.c_cc[VMIN] = 1;
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46 target_termios.c_cc[VTIME] = 0;
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47 /* start at B19200, as that's what we'll need to use initially */
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48 cfsetispeed(&target_termios, B19200);
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49 cfsetospeed(&target_termios, B19200);
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50 if (tcsetattr(target_fd, TCSAFLUSH, &target_termios) < 0) {
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51 perror("initial tcsetattr on target");
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52 exit(1);
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53 }
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54 return 0;
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55 }
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56
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57 switch_baud_rate(br)
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58 struct baudrate *br;
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59 {
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60 cfsetispeed(&target_termios, br->termios_code);
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61 cfsetospeed(&target_termios, br->termios_code);
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62 if (tcsetattr(target_fd, TCSAFLUSH, &target_termios) < 0) {
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63 perror("tcsetattr to switch baud rate");
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64 exit(1);
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65 }
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66 current_baud_rate = br;
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67 }