add missing files not taken with github import

util/wait.c

@@ -0,0 +1,85 @@
+/*
+ * wait.c
+ *
+ *  Created on: 10.12.2012
+ *      Author: mfro
+ *
+ * This file is part of BaS_gcc.
+ *
+ * BaS_gcc is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * BaS_gcc is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with BaS_gcc.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright 2010 - 2012 F. Aschwanden
+ * Copyright 2011 - 2012 V. Riviere
+ * Copyright 2012        M. Froeschle
+ *
+ */
+
+#include <stdint.h>
+#include <MCF5475.h>
+#include <wait.h>
+
+uint32_t get_timer(void)
+{
+    return MCF_SLT_SCNT(0);
+}
+
+static uint32_t timer_value;
+
+void start_timeout(void)
+{
+    timer_value = get_timer();
+}
+
+bool end_timeout(uint32_t msec)
+{
+    msec *= SYSCLK;
+
+    return (get_timer() - timer_value) < msec ? false : true;
+}
+
+/*
+ * wait for the specified number of us on slice timer 0. Replaces the original routines that had
+ * the number of useconds to wait for hardcoded in their name.
+ */
+void wait(uint32_t us)
+{
+    int32_t target = MCF_SLT_SCNT(0) - (us * (SYSCLK / 1000));
+
+    while (MCF_SLT_SCNT(0) - target > 0);
+}
+void wait_us() __attribute__ ((weak, alias("wait")));
+
+/*
+ * same as above, but with milliseconds wait time
+ */
+void wait_ms(uint32_t ms)
+{
+    wait(ms * 1000);
+}
+/*
+ * the same as above, with a checker function which gets called while
+ * busy waiting and allows for an early return if it returns true
+ */
+bool waitfor(uint32_t us, checker_func condition)
+{
+    int32_t target = MCF_SLT_SCNT(0) - (us * (SYSCLK / 1000));
+    bool res;
+
+    do
+    {
+        if ((res = (*condition)()))
+            return res;
+    } while (MCF_SLT_SCNT(0) - target > 0);
+    return false;
+}