138 lines
3.8 KiB
C++
138 lines
3.8 KiB
C++
#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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// Function credit: wallyk & RicoRico
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int set_interface_attribs (int fd, int speed, int parity) {
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struct termios tty;
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memset (&tty, 0, sizeof tty);
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if (tcgetattr (fd, &tty) != 0)
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{
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perror("error from tcgetattr");
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return -1;
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}
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cfsetospeed (&tty, speed);
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cfsetispeed (&tty, speed);
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tty.c_cflag = (tty.c_cflag & ~CSIZE) | CS8; // 8-bit chars
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// disable IGNBRK for mismatched speed tests; otherwise receive break
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// as \000 chars
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tty.c_iflag &= ~IGNBRK; // disable break processing
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tty.c_lflag = 0; // no signaling chars, no echo,
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// no canonical processing
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tty.c_oflag = 0; // no remapping, no delays
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tty.c_cc[VMIN] = 0; // read doesn't block
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tty.c_cc[VTIME] = 5; // 0.5 seconds read timeout
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tty.c_iflag &= ~(IXON | IXOFF | IXANY); // shut off xon/xoff ctrl
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tty.c_cflag |= (CLOCAL | CREAD);// ignore modem controls,
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// enable reading
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tty.c_cflag &= ~(PARENB | PARODD); // shut off parity
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tty.c_cflag |= parity;
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tty.c_cflag &= ~CSTOPB;
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tty.c_cflag &= ~CRTSCTS;
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if (tcsetattr (fd, TCSANOW, &tty) != 0)
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{
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perror("error from tcsetattr");
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return -1;
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}
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return 0;
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}
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// Function credit: wallyk & RicoRico
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void set_blocking (int fd, int should_block) {
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struct termios tty;
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memset (&tty, 0, sizeof tty);
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if (tcgetattr (fd, &tty) != 0)
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{
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perror("error from tggetattr");
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return;
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}
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tty.c_cc[VMIN] = should_block ? 1 : 0;
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tty.c_cc[VTIME] = 5; // 0.5 seconds read timeout
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if (tcsetattr (fd, TCSANOW, &tty) != 0)
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perror("error %d setting term attributes");
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}
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int init_port(char *portname){
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int fd = open (portname, O_RDWR | O_NOCTTY | O_SYNC);
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if (fd < 0)
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{
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perror("error opening file");
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return 1;
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}
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set_interface_attribs (fd, B9600, 0); // set speed to 9,600 bps, 8n1 (no parity)
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set_blocking (fd, 0); // set no blocking
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return fd;
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}
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void send_line(int iw, char *line, size_t len){
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write(iw, strcat(line, "\n\r"), len+2);
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}
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void print_buffer(int iw, char *buf, size_t len){
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char seg[250];
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int i = 0;
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while (i < len){
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int amnt = 250;
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if (len - i < 250) amnt = len - i;
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memcpy(seg, (buf+i), amnt);
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write(iw, seg, amnt);
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i += 250;
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//printf("Done segment!\n");
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usleep(990000); //Don't overfill buffer
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}
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write(iw, "\n\r", 2);
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}
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char * read_text(char * filename){
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char * filebuf = (char*)calloc(sizeof(char),4000);
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char line[92];
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printf("Reading file %s...\n", filename);
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FILE *fp = fopen(filename, "r"); // do not use "rb"
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size_t i = 0;
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while (fgets(line, sizeof(line)-2, fp)) {
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//printf(line);
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if (strlen(line) >= 89) strcat(line, "\n");
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strcat(filebuf, line);
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printf(filebuf);
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}
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fclose(fp);
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printf("Done! closing file read\n");
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return filebuf;
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}
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int main(int argc, char *argv[]){
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if (argc != 2) printf("Please execute with filename of text file\n");
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char txt[40];
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char *portname = "/dev/ttyS0";
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int iw_serial = init_port(portname);
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//strcpy(txt, "Hello world!");
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char * intext = read_text(argv[1]);
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printf("String Length: %d\n", strlen(intext));
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print_buffer(iw_serial, intext, strlen(intext));
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free(intext);
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usleep ((7 + 25) * 10000); // sleep enough to transmit the 7 plus
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// receive 25: approx 100 uS per char transmit
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//char buf [100];
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//int n = read (fd, buf, sizeof buf); // read up to 100 characters if ready to read
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return 0;
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}
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