2 files changed, 26 insertions, 0 deletions
diff --git a/my-common-code/api-asm.S b/my-common-code/api-asm.S
new file mode 100644
index 0000000..93419fd
--- /dev/null
+++ b/my-common-code/api-asm.S
@@ -0,0 +1,19 @@
+/* 
+ * Example of a pure assembly file
+ * For most people, this is normally unnecessary, you can use inline
+ * ASM in a C file, if you even need to use ASM at all.
+ * However, if you reallllly like doing this sort of thing, here's how :)
+ */
+
+.syntax unified
+.thumb
+.section .text
+
+#include <libopencm3/stm32/gpio.h>
+
+.global rev_bytes
+.func rev_bytes  /* only used for debugger */
+.type rev_bytes, STT_FUNC
+rev_bytes:
+    rev r0, r0
+    bx lr
diff --git a/my-common-code/api-asm.h b/my-common-code/api-asm.h
new file mode 100644
index 0000000..b153620
--- /dev/null
+++ b/my-common-code/api-asm.h
@@ -0,0 +1,7 @@
+#include <stdint.h>
+/**
+ * Reverse bytes in words
+ * @param in word in form abcd
+ * @returns word in form dcba
+ */
+uint32_t rev_bytes(uint32_t in);