X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/hmcfgusb/blobdiff_plain/4cadd56df3b8ae13191061cd1daf162596ff481b..b55c340d3dbf7b6071d64260a3dc5287c940b984:/hmcfgusb.c?ds=sidebyside

diff --git a/hmcfgusb.c b/hmcfgusb.c
index 0bcb5ae..f35138f 100644
--- a/hmcfgusb.c
+++ b/hmcfgusb.c
@@ -29,6 +29,7 @@
 #include <math.h>
 #include <poll.h>
 #include <errno.h>
+#include <sys/time.h>
 #include <libusb-1.0/libusb.h>
 
 #include "hexdump.h"
@@ -139,13 +140,33 @@ static libusb_device_handle *hmcfgusb_find() {
 	return NULL;
 }
 
+int hmcfgusb_send_null_frame(struct hmcfgusb_dev *usbdev)
+{
+	int err;
+	int cnt;
+
+	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, NULL, 0, &cnt, USB_TIMEOUT);
+	if (err) {
+		fprintf(stderr, "Can't send data: %s\n", usb_strerror(err));
+		return 0;
+	}
+
+	return 1;
+}
+
 int hmcfgusb_send(struct hmcfgusb_dev *usbdev, unsigned char* send_data, int len, int done)
 {
 	int err;
 	int cnt;
+	struct timeval tv_start, tv_end;
+	int msec;
 
-	if (debug)
+	if (debug) {
 		hexdump(send_data, len, "USB < ");
+	}
+
+	gettimeofday(&tv_start, NULL);
+
 	err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, send_data, len, &cnt, USB_TIMEOUT);
 	if (err) {
 		fprintf(stderr, "Can't send data: %s\n", usb_strerror(err));
@@ -153,13 +174,20 @@ int hmcfgusb_send(struct hmcfgusb_dev *usbdev, unsigned char* send_data, int len
 	}
 
 	if (done) {
-		err = libusb_interrupt_transfer(usbdev->usb_devh, EP_OUT, send_data, 0, &cnt, USB_TIMEOUT);
-		if (err) {
-			fprintf(stderr, "Can't send data: %s\n", usb_strerror(err));
+		if (!hmcfgusb_send_null_frame(usbdev)) {
 			return 0;
 		}
 	}
 
+	gettimeofday(&tv_end, NULL);
+	msec = ((tv_end.tv_sec-tv_start.tv_sec)*1000)+((tv_end.tv_usec-tv_start.tv_usec)/1000);
+
+	if (msec > 100) {
+		fprintf(stderr, "usb-transfer took more than 100ms (%dms), this may lead to timing problems!\n", msec);
+	} else if (debug) {
+		fprintf(stderr, "usb-transfer took %dms!\n", msec);
+	}
+
 	return 1;
 }