From: Michael Gernoth <michael@gernoth.net>
Date: Mon, 7 Jun 2010 08:29:12 +0000 (+0200)
Subject: add byteorder macros
X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/rigol/commitdiff_plain/ddf9f28b7fcb36da063e26102f7f97190e4158c8?hp=2999345d8f501d54dc19bc3f60f01c573910d565

add byteorder macros
---

diff --git a/usbtmc.c b/usbtmc.c
index 32f83a8..835b6c8 100644
--- a/usbtmc.c
+++ b/usbtmc.c
@@ -8,6 +8,14 @@
 
 #define USB_TIMEOUT 50000
 
+#if BYTE_ORDER == LITTLE_ENDIAN
+#define LE32(x) x
+#elif BYTE_ORDER == BIG_ENDIAN
+#define LE32(x) ((uint32_t)((((uint32_t)x)>>24) | ((((uint32_t)x)>>8) & 0xff00) | ((((uint32_t)x)<<8) & 0xff0000) | (((uint32_t)x)<<24)))
+#else
+#error BYTE_ORDER not defined/known!
+#endif
+
 //Helper-routine: Convert a little-endian 4-byte word to an int
 static void int2chars(unsigned char *buff,unsigned int a) {
 	buff[3]=(a>>24)&0xff;