X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=bertos%2Fdrv%2Fusb.h;h=eee7828bafdecf32f2181b69037056aca6f0c4ef;hb=7911a6f01bc8a19f220f98e2fdc8595f65996853;hp=23b14973af96ce9d6dfd7c52aa60013be6b5173c;hpb=4512274f1561597d312d5f6b6bc72284f65854ca;p=bertos.git

diff --git a/bertos/drv/usb.h b/bertos/drv/usb.h
index 23b14973..eee7828b 100644
--- a/bertos/drv/usb.h
+++ b/bertos/drv/usb.h
@@ -37,6 +37,8 @@
  * This file holds USB constants and structures that are needed for USB device
  * APIs, as defined in the USB 2.0 specification.
  *
+ * \attention The API is work in progress and may change in future versions.
+ *
  * $WIZ$ module_name = "usb"
  * $WIZ$ module_configuration = "bertos/cfg/cfg_usb.h"
  * $WIZ$ module_supports = "stm32"
@@ -485,17 +487,41 @@ INLINE int usb_endpointIsIsocOut(const struct UsbEndpointDesc *epd)
  * Read up to \a size bytes from the USB endpoint identified by the address
  * \a ep and store them in \a buffer.
  *
- * \return number of bytes actually read.
+ * The \a timeout is an upper bound on the amount of time (in ticks) elapsed
+ * before returns. If \a timeout is zero, the the function returns immediatly
+ * and it basically works in non-blocking fashion. A negative value for \a
+ * timeout means that the function can block indefinitely.
+ *
+ * \return number of bytes actually read, or a negative value in case of
+ * errors.
  */
-ssize_t usb_endpointRead(int ep, void *buffer, ssize_t size);
+ssize_t usb_endpointReadTimeout(int ep, void *buffer, ssize_t size,
+				ticks_t timeout);
+
+INLINE ssize_t usb_endpointRead(int ep, void *buffer, ssize_t size)
+{
+	return usb_endpointReadTimeout(ep, buffer, size, -1);
+}
 
 /**
  * Write up to \a size bytes from the buffer pointed \a buffer to the USB
  * endpoint identified by the address \a ep.
  *
- * \return number of bytes actually wrote.
+ * The \a timeout is an upper bound on the amount of time (in ticks) elapsed
+ * before returns. If \a timeout is zero, the the function returns immediatly
+ * and it basically works in non-blocking fashion. A negative value for \a
+ * timeout means that the function can block indefinitely.
+ *
+ * \return number of bytes actually wrote, or a negative value in case of
+ * errors.
  */
-ssize_t usb_endpointWrite(int ep, const void *buffer, ssize_t size);
+ssize_t usb_endpointWriteTimeout(int ep, const void *buffer, ssize_t size,
+				ticks_t timeout);
+
+INLINE ssize_t usb_endpointWrite(int ep, const void *buffer, ssize_t size)
+{
+	return usb_endpointWriteTimeout(ep, buffer, size, -1);
+}
 
 /**
  * Register a generic USB device driver \a dev in the USB controller.