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/*
 * sertest.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 SERIAL_PORT	"/dev/ttyS0"
 
#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;
static int errors;
 
 
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(void) {
  sfd = open(SERIAL_PORT, O_RDWR | O_NOCTTY | O_NDELAY);
  if (sfd == -1) {
    error("cannot open serial port '%s'", SERIAL_PORT);
  }
  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;
}
 
 
void block(void) {
  unsigned char src[1000];
  unsigned char dst[1000];
  unsigned char *p, *q;
  int i;
 
  for (i = 0; i < 1000; i++) {
    src[i] = rand();
  }
  p = src;
  q = dst;
  while (1) {
    if (p != &src[1000] && serialSnd(*p)) {
      p++;
    }
    if (q != &dst[1000] && serialRcv(q)) {
      q++;
    }
    if (q == &dst[1000]) {
      break;
    }
  }
  for (i = 0; i < 1000; i++) {
    if (((src[i] + 0x5C) & 0xFF) != dst[i]) {
      errors++;
    }
  }
}
 
 
int main(int argc, char *argv[]) {
  int i;
 
  if (argc != 1) {
    printf("Usage: %s\n", argv[0]);
    exit(1);
  }
  serialOpen();
  errors = 0;
  for (i = 1; i <= 100; i++) {
    block();
    if (i % 10 == 0) {
      printf("%d bytes, errors = %d\n", i * 1000, errors);
    }
  }
  if (sfd != 0) {
    serialClose();
    sfd = 0;
  }
  return 0;
}