1 files changed, 6 insertions, 2 deletions
diff --git a/tools/reset_arduino.c b/tools/reset_arduino.c
index 99ace88..53dbbf5 100644
--- a/tools/reset_arduino.c
+++ b/tools/reset_arduino.c
@@ -27,6 +27,8 @@
 #include <time.h>
 #include <stdio.h>
 #include <sys/select.h>
+#include <errno.h>
+#include <string.h>
 
 #define STATE_OFF 0
 #define STATE_ON  1
@@ -44,10 +46,12 @@ main(int argc, char* argv[])
 {
   char* device = argc < 2 ? "/dev/ttyUSB0" : argv[1];
   int fd = open(device, O_RDWR);
-  if (fd == 0) {
-    fprintf(stderr, "Could not open %s\n", device);
+  if (fd < 0) {
+    fprintf(stderr, "Could not open %s (%s)\n", device, strerror(errno));
     return EXIT_FAILURE;
   }
+
+  printf("reseting arduino at %s\n", device);
   
   setDTRState(fd, STATE_ON);
   struct timeval sleeptime = {0, 100000}; // 100ms