FreeCalypso > hg > freecalypso-sw

annotate loadtools/sercomm.c @ 992:a7b0b426f9ca

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target-utils: boot ROM UART autodetection revamped The new implementation should work with both the familiar Calypso C035 boot ROM version found in our regular targets as well as the older Calypso F741979B version found on the vintage D-Sample board.
author Mychaela Falconia <falcon@ivan.Harhan.ORG>
date Wed, 30 Dec 2015 21:28:41 +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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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 }