20000317 sourceware import

libgloss/pa/op50nled.c

@@ -0,0 +1,81 @@
+/* op50nled.c -- fucntions that manipulate the LEDs.
+ * 
+ * Copyright (c) 1995 Cygnus Support
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+#include "op50n.h"
+
+void zylons();
+void strobe();
+void led_putnum();
+void delay();
+
+/*
+ * led_putnum -- print a hex number on the LED. the value of num must be a byte. 
+ *		 The max number 15, since the front panel only has 4 LEDs.
+ */
+void
+led_putnum ( num )
+char num;
+{
+    static unsigned char *leds = (unsigned char *)LED_ADDR;
+    
+/**    *leds = (num << 4); **/
+    *leds = num;
+}
+
+/*
+ * strobe -- do a zylons thing, toggling each led in sequence forever...
+ */
+void
+zylons()
+{
+  while (1) {
+    strobe();
+  }
+}
+
+/*
+ * strobe -- toggle each led in sequence up and back once.
+ */
+void
+strobe()
+{
+  static unsigned char curled;
+  static unsigned char dir;
+
+  curled = 1;
+  dir = 0;
+  while (curled != 0) {
+    led_putnum (curled);
+    delay (70000);
+    if (dir)
+      curled >>= 1;
+    else
+      curled <<= 1;
+    
+    if (curled == 0x100) {
+      dir = ~dir;
+    }
+  }
+  curled = 1;
+  dir = 0;
+}
+
+void
+delay (x)
+     int x;
+{
+  int  y = 17;
+  while (x-- !=0)
+    y = y^2;
+}