Initial import.

aqhome/sertest.c

@@ -0,0 +1,104 @@
+
+#include <stdio.h>
+#include <fcntl.h>       /* File Control Definitions           */
+#include <termios.h>     /* POSIX Terminal Control Definitions */
+#include <unistd.h>      /* UNIX Standard Definitions          */
+#include <errno.h>       /* ERROR Number Definitions           */
+#include <sys/ioctl.h>   /* ioctl()                            */
+#include <ctype.h>
+
+
+void testSend(int fd);
+
+
+
+int main(void)
+{
+  int fd;     /*File Descriptor*/
+  int status;
+  int i;
+  struct termios options;
+
+  fd = open("/dev/ttyUSB0",O_RDWR | O_NOCTTY ); //Opening the serial port
+  tcgetattr(fd, &options);
+  cfsetispeed(&options, B19200);
+  cfsetospeed(&options, B19200);
+
+  options.c_cflag &= ~PARENB;
+  options.c_cflag &= ~CSTOPB;
+  options.c_cflag &= ~CSIZE;
+  options.c_cflag |= CS8;
+
+  options.c_cflag &= ~CRTSCTS; /* disable HW flow control */
+  options.c_iflag &= ~(IXON | IXOFF | IXANY); /* disable SW flow control */
+
+  options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); /* raw input */
+
+  tcsetattr(fd, TCSANOW, &options);
+
+  for (i=0;; i++) {
+    char r;
+
+    testSend(fd);
+    r=getchar(); //To view the change in status pins before closing the port
+    if (r=='q' || r=='Q')
+      break;
+  }
+
+  close(fd);
+  return 0;
+}
+
+
+
+
+void testSend(int fd)
+{
+  int status;
+  const unsigned char bufOut[2]="B";
+  unsigned char bufIn[256];
+  ssize_t len;
+  
+  ioctl(fd,TIOCMGET,&status); /* GET the State of MODEM bits in Status */
+  status |= TIOCM_DTR;        // Set the DTR pin
+  ioctl(fd, TIOCMSET, &status);
+
+  usleep(10);
+
+  write(fd, bufOut, 1);
+
+  usleep(10);
+
+  ioctl(fd,TIOCMGET,&status); /* GET the State of MODEM bits in Status */
+  status &= ~ TIOCM_DTR;        // Set the DTR pin HIGH (cave: signals inverted!)
+  ioctl(fd, TIOCMSET, &status);
+
+#if 1
+  len=read(fd, bufIn, sizeof(bufIn)-1);
+  if (len<1) {
+    fprintf(stderr, "ERROR on read\n");
+  }
+  else {
+    ssize_t i;
+
+    fprintf(stderr, "Received: ");
+    for(i=0; i<len; i++) {
+      fprintf(stderr, "%02x", bufIn[i]);
+    }
+    fprintf(stderr, "  ");
+    for(i=0; i<len; i++) {
+      char j;
+
+      j=bufIn[i];
+      if (iscntrl(j))
+	j='?';
+      fprintf(stderr, "%c", j);
+    }
+    fprintf(stderr, "\n");
+  }
+#endif
+}
+
+
+
+