X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/rigol/blobdiff_plain/0926876978e80ae1e9c29d9f33a8f8ec0babaf5e..7df76f49adf30ac260c99649678b084c9b6c282b:/usbtmc.c

diff --git a/usbtmc.c b/usbtmc.c
index 622ea80..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;
@@ -126,8 +134,7 @@ usb_dev_handle* usbtmc_initscope(void) {
 	//Locate and open the scope
 	dev = usbtmc_find_scope();
 	if (!dev) {
-		printf("No scope found.\n");
-		exit(1);
+		return NULL;
 	}
 	usbtmc_claim(dev);
 	//The following code isn't really necessary, the program works