FreeCalypso > hg > freecalypso-sw

annotate rvinterf/lowlevel/openport.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 f42854da4563
children
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173
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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1 /*
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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2 * This module takes care of opening the serial port and setting the
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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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 }