New function to modify fifo overwritability

src/class/cdc/cdc_device.c

@@ -356,7 +356,7 @@ bool cdcd_control_request(uint8_t rhport, tusb_control_request_t const * request
       p_cdc->line_state = (uint8_t) request->wValue;
 
       // Disable fifo overwriting if DTR bit is set
-      p_cdc->tx_ff.overwritable = dtr ? false : true;
+      tu_fifo_change_mode(&p_cdc->tx_ff, (dtr?false:true));
 
       TU_LOG2("  Set Control Line State: DTR = %d, RTS = %d\r\n", dtr, rts);
 

src/common/tusb_fifo.c

@@ -319,3 +319,22 @@ bool tu_fifo_clear(tu_fifo_t *f)
 
   return true;
 }
+
+/******************************************************************************/
+/*!
+    @brief Change the fifo mode to overwritable or not overwritable
+
+    @param[in]  f
+                Pointer to the FIFO buffer to manipulate
+*/
+/******************************************************************************/
+bool tu_fifo_change_mode(tu_fifo_t *f, bool overwritable)
+{
+  tu_fifo_lock(f);
+
+  f->overwritable = overwritable;
+
+  tu_fifo_unlock(f);
+
+  return true;
+}

src/common/tusb_fifo.h

@@ -76,6 +76,7 @@ typedef struct
       .overwritable = _overwritable,         \
   }
 
+bool tu_fifo_change_mode(tu_fifo_t *f, bool overwritable);
 bool tu_fifo_clear(tu_fifo_t *f);
 bool tu_fifo_config(tu_fifo_t *f, void* buffer, uint16_t depth, uint16_t item_size, bool overwritable);