importing basic functions

functions/serial.c

@@ -0,0 +1,75 @@
+#include  <stdio.h>
+#include  <stdlib.h>
+#include  <termios.h>		/* serial things */
+#include  <unistd.h>
+#include  <fcntl.h>
+
+#include  "serial.h"
+
+/* ----------------------------------------------------------------- */
+/*
+ *	this variable must be declared/initialised in your
+ *	main program.
+ */
+ 
+extern int verbosity;
+
+/* ----------------------------------------------------------------- */
+/* values for 'bauds' can be found in /usr/include/bits/termios.h
+ */
+int open_serial(char *dev, int bauds, int unused)
+{
+int		fd;
+
+#if DEBUG_LEVEL
+fprintf(stderr, "opening %s (b/s code : 0%06o)\n", dev, bauds);
+#endif
+
+fd = open(dev, O_RDWR, O_NOCTTY);
+if (fd < 0) {
+	perror(dev);
+	return -1;
+	}
+
+return fd;
+}
+/* ----------------------------------------------------------------- */
+/*
+ *		from the manpage
+ The  zero baud rate, B0, is used to terminate the connection. If B0 is
+ specified, the modem control lines shall no longer be asserted. Normally,  
+ this will disconnect the line.  
+ */
+
+int bauds_str_to_B(char *strb, int unused)
+{
+long		value;
+
+#if DEBUG_LEVEL
+fprintf(stderr, "--> %s ( '%s' 0x%x )\n", __func__, strb, unused);
+#endif
+
+if (1 != sscanf(strb, "%ld", &value)) {
+	return B0;
+	}
+#if DEBUG_LEVEL
+fprintf(stderr, "    computed baudrate = %ld\n", value);
+#endif
+
+switch (value) {
+	case	50:		return B50;
+	case	75:		return B75;
+	case	110:		return B110;
+	case	300:		return B300;
+	case	1200:		return B1200;
+	case	2400:		return B2400;
+	case	4800:		return B4800;
+	case	9600:		return B9600;
+	case	19200:		return B19200;
+	}
+
+return B0;
+}
+/* ----------------------------------------------------------------- */
+/* ----------------------------------------------------------------- */
+/* ----------------------------------------------------------------- */