samd51 fix stable issue with dcd

1 files changed, 8 insertions, 4 deletions

diff --git a/src/device/dcd.h b/src/device/dcd.h
index bd0ea852e..f07bda2d3 100644
--- a/src/device/dcd.h
+++ b/src/device/dcd.h
@@ -124,10 +124,14 @@ void dcd_event_xfer_complete (uint8_t rhport, uint8_t ep_addr, uint32_t xferred_
 

 /*------------------------------------------------------------------*/

 /* Endpoint API

- * Note:

- * - Address of control endpoint OUT is 0x00, In is 0x80

- * - When stalling control endpoint both control OUT and IN must be stalled

- * (according to USB spec, stalled control is only recovered with setup token)

+ *  - open        : Configure endpoint's registers

+ *  - xfer        : Submit a transfer. When complete dcd_event_xfer_complete

+ *                  must be called to notify the stack

+ *  - busy        : Check if endpoint transferring is complete (TODO remove)

+ *  - stall       : stall ep. When control endpoint (addr = 0) is stalled,

+ *                  both direction (IN & OUT) of control ep must be stalled.

+ *  - clear_stall : clear stall

+ *  - stalled     : check if stalled ( TODO remove )

  *------------------------------------------------------------------*/

 bool dcd_edpt_open        (uint8_t rhport, tusb_desc_endpoint_t const * p_endpoint_desc);

 bool dcd_edpt_xfer        (uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes);