diff --git a/src/main/io/canvas.c b/src/main/io/canvas.c
index e57e641eb9..f2d0eeed15 100644
--- a/src/main/io/canvas.c
+++ b/src/main/io/canvas.c
@@ -75,7 +75,7 @@ void canvasResync(displayPort_t *pPort)
     pPort->rows = 30;
 }
 
-uint32_t canvasTxRoom(void)
+uint32_t canvasTxBytesFree(void)
 {
     return mspSerialTxBytesFree();
 }
@@ -87,7 +87,7 @@ displayPortVTable_t canvasVTable = {
     canvasWrite,
     canvasHeartBeat,
     canvasResync,
-    canvasTxRoom,
+    canvasTxBytesFree,
 };
 
 void canvasCmsInit(displayPort_t *pPort)
diff --git a/src/main/io/cms.c b/src/main/io/cms.c
index 706b1ccec6..d65ac12d94 100644
--- a/src/main/io/cms.c
+++ b/src/main/io/cms.c
@@ -136,9 +136,9 @@ void cmsScreenResync(displayPort_t *instance)
     instance->vTable->resync(instance);
 }
 
-uint16_t cmsScreenTxRoom(displayPort_t *instance)
+uint16_t cmsScreenTxBytesFree(displayPort_t *instance)
 {
-    return instance->vTable->txroom();
+    return instance->vTable->txBytesFree();
 }
 
 void cmsScreenInit(displayPort_t *pDisp, cmsDeviceInitFuncPtr cmsDeviceInitFunc)
@@ -376,7 +376,7 @@ void cmsDrawMenu(displayPort_t *pDisplay)
     static uint8_t pollDenom = 0;
     bool drawPolled = (++pollDenom % 8 == 0);
 
-    uint32_t room = cmsScreenTxRoom(pDisplay);
+    uint32_t room = cmsScreenTxBytesFree(pDisplay);
 
     if (!currentMenu)
         return;
diff --git a/src/main/io/cms.h b/src/main/io/cms.h
index e90f228278..bef66c62e2 100644
--- a/src/main/io/cms.h
+++ b/src/main/io/cms.h
@@ -9,7 +9,7 @@ typedef struct displayPortVTable_s {
     int (*write)(uint8_t col, uint8_t row, char *text);
     int (*heartbeat)(void);
     void (*resync)(struct displayPort_s *pPort);
-    uint32_t (*txroom)(void);
+    uint32_t (*txBytesFree)(void);
 } displayPortVTable_t;
 
 typedef struct displayPort_s {
diff --git a/src/main/io/display.c b/src/main/io/display.c
index d9b651b69d..bc44e6552d 100644
--- a/src/main/io/display.c
+++ b/src/main/io/display.c
@@ -788,7 +788,7 @@ void displayCmsResync(displayPort_t *pPort)
     UNUSED(pPort);
 }
 
-uint32_t displayCmsTxroom(void)
+uint32_t displayCmsTxBytesFree(void)
 {
     return UINT32_MAX;
 }
@@ -800,7 +800,7 @@ displayPortVTable_t displayCmsVTable = {
     displayCmsWrite,
     displayCmsHeartbeat,
     displayCmsResync,
-    displayCmsTxroom,
+    displayCmsTxBytesFree,
 };
 
 void displayCmsInit(displayPort_t *pPort)
diff --git a/src/main/io/osd.c b/src/main/io/osd.c
index 472dacd428..6ba590020c 100755
--- a/src/main/io/osd.c
+++ b/src/main/io/osd.c
@@ -683,7 +683,7 @@ int osdHeartbeat(void)
     return 0;
 }
 
-uint32_t osdTxroom(void)
+uint32_t osdTxBytesFree(void)
 {
     return UINT32_MAX;
 }
@@ -721,7 +721,7 @@ displayPortVTable_t osdVTable = {
     osdWrite,
     osdHeartbeat,
     osdResync,
-    osdTxroom,
+    osdTxBytesFree,
 };
 
 void osdCmsInit(displayPort_t *pPort)