1 | #include <errno.h>
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2 | #include <fcntl.h>
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3 | #include <stdio.h>
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4 | #include <stdlib.h>
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5 | #include <string.h>
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6 | #include <termios.h>
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7 | #include <unistd.h>
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8 | #include <sys/select.h>
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9 | #include <sys/time.h>
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10 | #include <sys/types.h>
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11 | #include <sys/ioctl.h>
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12 |
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13 | int set_interface_attribs(int fd, int speed)
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14 | {
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15 | struct termios tty;
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16 |
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17 | if (tcgetattr(fd, &tty) < 0) {
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18 | printf("Error from tcgetattr: %s\n", strerror(errno));
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19 | return -1;
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20 | }
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21 |
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22 | cfsetospeed(&tty, (speed_t)speed);
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23 | cfsetispeed(&tty, (speed_t)speed);
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24 |
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25 | tty.c_cflag |= (CLOCAL | CREAD); /* ignore modem controls */
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26 | tty.c_cflag &= ~CSIZE;
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27 | tty.c_cflag |= CS8; /* 8-bit characters */
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28 | tty.c_cflag &= ~PARENB; /* no parity bit */
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29 | tty.c_cflag &= ~CSTOPB; /* only need 1 stop bit */
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30 | tty.c_cflag &= ~CRTSCTS; /* no hardware flowcontrol */
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31 |
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32 | /* setup for non-canonical mode */
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33 | tty.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
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34 | tty.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
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35 | tty.c_oflag &= ~OPOST;
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36 |
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37 | /* fetch bytes as they become available */
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38 | tty.c_cc[VMIN] = 49;
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39 | tty.c_cc[VTIME] = 10;
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40 |
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41 | if (tcsetattr(fd, TCSANOW, &tty) != 0) {
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42 | printf("Error from tcsetattr: %s\n", strerror(errno));
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43 | return -1;
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44 | }
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45 | sleep(2);
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46 | if (tcsetattr(fd, TCSAFLUSH, &tty) != 0) {
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47 | printf("Error from tcsetattr: %s\n", strerror(errno));
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48 | return -1;
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49 | }
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50 | return 0;
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51 | }
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52 |
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53 | int main()
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54 | {
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55 | char *portname = "/dev/ttyS1";
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56 | int fd = 0;
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57 | int wlen;
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58 | unsigned char send_bytes[] ={0xde,0x01,0x05,0x59,0x83};
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59 |
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60 | fd = open(portname, O_RDWR | O_NOCTTY | O_SYNC);
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61 | if (fd < 0) {
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62 | printf("Error opening %s: %s\n", portname, strerror(errno));
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63 | return -1;
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64 | }
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65 | set_interface_attribs(fd, B115200);
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66 |
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67 | //wlen = write(fd, send_bytes, 5);
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68 |
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69 | int maxfd,n;
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70 | maxfd = fd + 1;
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71 |
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72 | struct timeval timeout;
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73 | fd_set readSet;
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74 | unsigned char buf[254];
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75 | int rdlen;
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76 |
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77 | do {
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78 | /*
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79 | wlen = write(fd,"\xde\x01\x05\x59\x83", 5);
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80 |
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81 | if (wlen != 5) {
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82 | printf("Error from write: %d, %d\n", wlen, errno);
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83 | }
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84 | */
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85 | printf("-->\n");
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86 |
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87 | timeout.tv_usec = 0; // milliseconds
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88 | timeout.tv_sec = 1; // seconds
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89 |
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90 | FD_ZERO(&readSet);
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91 | FD_SET(fd,&readSet);
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92 |
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93 | n = select(maxfd,&readSet, NULL, NULL,&timeout);
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94 | if (n>0)
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95 | {
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96 | if (FD_ISSET(fd, &readSet))
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97 | {
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98 | printf("--reading--->\n");
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99 | rdlen = read(fd, buf, sizeof(buf) - 1);
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100 | printf("length: %i\n",rdlen);
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101 |
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102 | if (rdlen > 1) {
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103 | unsigned char *p;
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104 | printf("Read %d:", rdlen);
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105 | for (p = buf; rdlen-- > 0; p++)
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106 | printf(" 0x%x", *p);
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107 | printf("\n");
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108 | } else if (rdlen <= 0) {
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109 | printf("Error from read: %d: %s\n", rdlen, strerror(errno));
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110 | }
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111 | }
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112 | }
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113 | else if(n<=0)
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114 | {
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115 | printf("FEHLER\n");
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116 | }
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117 | }while (1);
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118 | close(fd);
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119 | }
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