1 files changed, 73 insertions, 0 deletions
diff --git a/usrp2/firmware/lib/mdelay.c b/usrp2/firmware/lib/mdelay.c
new file mode 100644
index 000000000..c8c119b1a
--- /dev/null
+++ b/usrp2/firmware/lib/mdelay.c
@@ -0,0 +1,73 @@
+/* -*- c -*- */
+/*
+ * Copyright 2007 Free Software Foundation, Inc.
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "mdelay.h"
+#include "memory_map.h"
+
+// Delay about one millisecond.
+//
+// Need 33,333 cycles at 33 MHz.
+// Each time around the loop is 10 cycles
+//
+
+#define LOOPCNT(wb_div) (MASTER_CLK_RATE/(wb_div) / 10000)
+
+inline static void
+delay_1ms(int loop_count)
+{
+  int	i;
+  for (i = 0; i < loop_count; i++){
+    asm volatile ("or  r0, r0, r0\n\
+		   or  r0, r0, r0\n\
+		   or  r0, r0, r0\n\
+		   or  r0, r0, r0\n\
+		   or  r0, r0, r0\n\
+		   or  r0, r0, r0\n\
+		   or  r0, r0, r0\n");
+  }
+}
+
+// delay about ms milliseconds
+void
+mdelay(int ms)
+{
+  static int loop_count = -1;
+
+  if (hwconfig_simulation_p())
+    return;
+
+  if (loop_count < 0){
+    // set correct loop_count
+    static unsigned short lc[8] = {
+      0,
+      LOOPCNT(1),
+      LOOPCNT(2),
+      LOOPCNT(3),
+      LOOPCNT(4),
+      LOOPCNT(5),
+      LOOPCNT(6),
+      LOOPCNT(7)
+    };
+
+    loop_count = lc[hwconfig_wishbone_divisor() & 0x7];
+  }
+
+  int i;
+  for (i = 0; i < ms; i++)
+    delay_1ms(loop_count);
+}