Rework audio driver

src/device/dcd.h

@@ -125,23 +125,23 @@ void dcd_disconnect(uint8_t rhport) TU_ATTR_WEAK;
 void dcd_edpt0_status_complete(uint8_t rhport, tusb_control_request_t const * request) TU_ATTR_WEAK;
 
 // Configure endpoint's registers according to descriptor
-bool dcd_edpt_open        (uint8_t rhport, tusb_desc_endpoint_t const * p_endpoint_desc);
+bool dcd_edpt_open            (uint8_t rhport, tusb_desc_endpoint_t const * p_endpoint_desc);
 
 // Close an endpoint.
 // Since it is weak, caller must TU_ASSERT this function's existence before calling it.
-void dcd_edpt_close        (uint8_t rhport, uint8_t ep_addr) TU_ATTR_WEAK;
+void dcd_edpt_close           (uint8_t rhport, uint8_t ep_addr) TU_ATTR_WEAK;
 
 // Submit a transfer, When complete dcd_event_xfer_complete() is invoked to notify the stack
-bool dcd_edpt_xfer        (uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes);
+bool dcd_edpt_xfer            (uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes);
 
 // Submit an ISO transfer, When complete dcd_event_xfer_complete() is invoked to notify the stack
-bool dcd_edpt_iso_xfer    (uint8_t rhport, uint8_t ep_addr, tu_fifo_t * ff);
+bool dcd_edpt_iso_xfer (uint8_t rhport, uint8_t ep_addr, tu_fifo_t * ff, uint16_t total_bytes);
 
 // Stall endpoint
-void dcd_edpt_stall       (uint8_t rhport, uint8_t ep_addr);
+void dcd_edpt_stall           (uint8_t rhport, uint8_t ep_addr);
 
 // clear stall, data toggle is also reset to DATA0
-void dcd_edpt_clear_stall (uint8_t rhport, uint8_t ep_addr);
+void dcd_edpt_clear_stall     (uint8_t rhport, uint8_t ep_addr);
 
 //--------------------------------------------------------------------+
 // Event API (implemented by stack)

src/device/usbd.c

@@ -1206,12 +1206,16 @@ bool usbd_edpt_xfer(uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t
   }
 }
 
-bool usbd_edpt_iso_xfer(uint8_t rhport, uint8_t ep_addr, tu_fifo_t * ff)
+// The number of bytes has to be given explicitly to allow more flexible control of how many
+// bytes should be written and second to keep the return value free to give back a boolean
+// success message. If total_bytes is too big, the FIFO will copy only what is available
+// into the USB buffer!
+bool usbd_edpt_iso_xfer(uint8_t rhport, uint8_t ep_addr, tu_fifo_t * ff, uint16_t total_bytes)
 {
   uint8_t const epnum = tu_edpt_number(ep_addr);
   uint8_t const dir   = tu_edpt_dir(ep_addr);
 
-  TU_LOG2("  Queue ISO EP %02X with %u bytes ... ", ep_addr, tu_fifo_count(ff));
+  TU_LOG2("  Queue ISO EP %02X with %u bytes ... ", ep_addr, count);
 
   // Attempt to transfer on a busy endpoint, sound like an race condition !
   TU_ASSERT(_usbd_dev.ep_status[epnum][dir].busy == 0);
@@ -1220,7 +1224,7 @@ bool usbd_edpt_iso_xfer(uint8_t rhport, uint8_t ep_addr, tu_fifo_t * ff)
   // and usbd task can preempt and clear the busy
   _usbd_dev.ep_status[epnum][dir].busy = true;
 
-  if ( dcd_edpt_iso_xfer(rhport, ep_addr, ff) )
+  if (dcd_edpt_iso_xfer(rhport, ep_addr, ff, total_bytes))
   {
     TU_LOG2("OK\r\n");
     return true;

src/device/usbd_pvt.h

@@ -73,7 +73,7 @@ void usbd_edpt_close(uint8_t rhport, uint8_t ep_addr);
 bool usbd_edpt_xfer(uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes);
 
 // Submit a usb ISO transfer by use of a FIFO (ring buffer) - all bytes in FIFO get transmitted
-bool usbd_edpt_iso_xfer(uint8_t rhport, uint8_t ep_addr, tu_fifo_t * ff);
+bool usbd_edpt_iso_xfer(uint8_t rhport, uint8_t ep_addr, tu_fifo_t * ff, uint16_t total_bytes);
 
 // Claim an endpoint before submitting a transfer.
 // If caller does not make any transfer, it must release endpoint for others.