1 files changed, 41 insertions, 0 deletions
diff --git a/app/abs.c b/app/abs.c
new file mode 100644
index 0000000..769da7a
--- /dev/null
+++ b/app/abs.c
@@ -0,0 +1,41 @@
+#include "project.h"
+
+
+static uint32_t high_tick;
+
+
+uint64_t abs_extend (uint32_t now)
+{
+  static uint32_t then;
+
+
+  uint64_t ret;
+
+
+  if (now < then)
+    high_tick++;
+
+  then = now;
+
+
+  ret = high_tick;
+  ret <<= 32;
+  ret |= now;
+
+  return ret;
+}
+
+
+
+
+uint64_t abs_get (void)
+{
+  uint32_t now = SCS_DWT_CYCCNT;
+  return abs_extend (now);
+}
+
+
+void abs_slow_tick()
+{
+  abs_get();
+}