send a full frame containing only zeroes instead of a zero-byte frame

[hmcfgusb] / hmcfgusb.h

diff --git a/hmcfgusb.h b/hmcfgusb.h
index e33f6e68fb051c55316d28dd9bf07b5b6c364a71..df6d1c1717c525cdf05ae97641fff53985b58ac2 100644 (file)
--- a/hmcfgusb.h
+++ b/hmcfgusb.h
@@ -21,7 +21,7 @@
  * IN THE SOFTWARE.
  */
 
-typedef void (*hmcfgusb_cb_fn)(uint8_t *buf, int buf_len, void *data);
+typedef int (*hmcfgusb_cb_fn)(uint8_t *buf, int buf_len, void *data);
 
 struct hmcfgusb_dev {
        libusb_device_handle *usb_devh;
@@ -32,6 +32,7 @@ struct hmcfgusb_dev {
 };
 
 int hmcfgusb_send(struct hmcfgusb_dev *usbdev, unsigned char* send_data, int len, int done);
+int hmcfgusb_send_null_frame(struct hmcfgusb_dev *usbdev, int silent);
 struct hmcfgusb_dev *hmcfgusb_init(hmcfgusb_cb_fn cb, void *data);
 int hmcfgusb_add_pfd(struct hmcfgusb_dev *dev, int fd, short events);
 int hmcfgusb_poll(struct hmcfgusb_dev *dev, int timeout);