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/*

 * send.c -- serial line test program

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <stdarg.h>

#include <fcntl.h>

#include <unistd.h>

#include <termios.h>

#define NUM_TRIES       10

#define SYN             0x16

#define ACK             0x06

static FILE *diskFile = NULL;

static int sfd = 0;

static struct termios origOptions;

static struct termios currOptions;

void serialClose(void);

void error(char *fmt, ...) {

  va_list ap;

  va_start(ap, fmt);

  printf("Error: ");

  vprintf(fmt, ap);

  printf("\n");

  va_end(ap);

  if (diskFile != NULL) {

    fclose(diskFile);

    diskFile = NULL;

  }

  if (sfd != 0) {

    serialClose();

    sfd = 0;

  }

  exit(1);

}

void serialOpen(char *serialPort) {

  sfd = open(serialPort, O_RDWR | O_NOCTTY | O_NDELAY);

  if (sfd == -1) {

    error("cannot open serial port '%s'", serialPort);

  }

  tcgetattr(sfd, &origOptions);

  currOptions = origOptions;

  cfsetispeed(&currOptions, B38400);

  cfsetospeed(&currOptions, B38400);

  currOptions.c_cflag |= (CLOCAL | CREAD);

  currOptions.c_cflag &= ~PARENB;

  currOptions.c_cflag &= ~CSTOPB;

  currOptions.c_cflag &= ~CSIZE;

  currOptions.c_cflag |= CS8;

  currOptions.c_cflag &= ~CRTSCTS;

  currOptions.c_lflag &= ~(ICANON | ECHO | ECHONL | ISIG | IEXTEN);

  currOptions.c_iflag &= ~(IGNBRK | BRKINT | IGNPAR | PARMRK);

  currOptions.c_iflag &= ~(INPCK | ISTRIP | INLCR | IGNCR | ICRNL);

  currOptions.c_iflag &= ~(IXON | IXOFF | IXANY);

  currOptions.c_oflag &= ~(OPOST | ONLCR | OCRNL | ONOCR | ONLRET);

  tcsetattr(sfd, TCSANOW, &currOptions);

}

void serialClose(void) {

  tcsetattr(sfd, TCSANOW, &origOptions);

  close(sfd);

}

int serialSnd(unsigned char b) {

  int n;

  n = write(sfd, &b, 1);

  return n == 1;

}

int serialRcv(unsigned char *bp) {

  int n;

  n = read(sfd, bp, 1);

  return n == 1;

}

int main(int argc, char *argv[]) {

  char *serialPort;

  unsigned char curr;

  int count;

  if (argc != 2) {

    printf("Usage: %s <serial port>\n", argv[0]);

    exit(1);

  }

  serialPort = argv[1];

  serialOpen(serialPort);

  curr = 0;

  count = 0;

  while (count < 100000) {

    while (!serialSnd(curr)) ;

    curr = (curr + 1) & 0xFF;

    count++;

  }

  printf("count = %d\n", count);

  while (!serialRcv(&curr)) ;

  printf("answer = %c\n", curr);

  if (sfd != 0) {

    serialClose();

    sfd = 0;

  }

  return 0;

}