From 4071e490e259de5bf2891c9893ab7965b5be3d2e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20D=C3=BCmpelmann?= <jan.duempelmann@inotec-licht.de>
Date: Thu, 3 Sep 2020 17:21:32 +0200
Subject: [PATCH] New function to modify fifo overwritability

---
 src/class/cdc/cdc_device.c |  2 +-
 src/common/tusb_fifo.c     | 19 +++++++++++++++++++
 src/common/tusb_fifo.h     |  1 +
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/class/cdc/cdc_device.c b/src/class/cdc/cdc_device.c
index 6c0f5fc7a..6f71cb781 100644
--- a/src/class/cdc/cdc_device.c
+++ b/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);
 
diff --git a/src/common/tusb_fifo.c b/src/common/tusb_fifo.c
index 6ab158cca..fdd8c3e35 100644
--- a/src/common/tusb_fifo.c
+++ b/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;
+}
diff --git a/src/common/tusb_fifo.h b/src/common/tusb_fifo.h
index fb0c896f3..7957d83af 100644
--- a/src/common/tusb_fifo.h
+++ b/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);