add tuh_cdc_peek()

src/common/tusb_fifo.c

@@ -682,8 +682,6 @@ uint16_t tu_fifo_read_n_const_addr_full_words(tu_fifo_t* f, void * buffer, uint1
 
     @param[in]  f
                 Pointer to the FIFO buffer to manipulate
-    @param[in]  offset
-                Position to read from in the FIFO buffer with respect to read pointer
     @param[in]  p_buffer
                 Pointer to the place holder for data read from the buffer
 

src/common/tusb_private.h

@@ -160,6 +160,11 @@ uint32_t tu_edpt_stream_read_available(tu_edpt_stream_t* s)
   return (uint32_t) tu_fifo_count(&s->ff);
 }
 
+TU_ATTR_ALWAYS_INLINE static inline
+bool tu_edpt_stream_peek(tu_edpt_stream_t* s, uint8_t* ch)
+{
+  return tu_fifo_peek(&s->ff, ch);
+}
 
 #ifdef __cplusplus
  }