Merge branch 'refactor'

This merges the libmaple refactor work into master.  The contents of
libmaple proper (/libmaple/) are almost completely incompatible with
previous APIs in master.  See /docs/source/libmaple/overview.rst for
more information on the new design.

Wirish incompatibilities are limited to the HardwareTimer class;
however, there are several new deprecations, most likely to be removed
in 0.1.0.

1 files changed, 24 insertions, 0 deletions

diff --git a/libmaple/delay.h b/libmaple/delay.h
new file mode 100644
index 0000000..5372ac1
--- /dev/null
+++ b/libmaple/delay.h
@@ -0,0 +1,24 @@
+/**
+ *  @brief Delay implementation
+ */
+
+#ifndef _DELAY_H_
+#define _DELAY_H_
+
+static inline void delay_us(uint32 us) {
+    /* TODO this makes unwarranted assumptions about the RCC
+     * config; add a hook so users can make their own decisions. */
+    /* So (2^32)/12 micros max, or less than 6 minutes */
+    us *= 12;
+
+    /* fudge for function call overhead  */
+    us--;
+    asm volatile("   mov r0, %[us]          \n\t"
+                 "1: subs r0, #1            \n\t"
+                 "   bhi 1b                 \n\t"
+                 :
+                 : [us] "r" (us)
+                 : "r0");
+}
+#endif
+