add TinyUSB_Device_FlushCDC

Author: hathach

src/arduino/Adafruit_TinyUSB_API.cpp

@@ -44,6 +44,12 @@ void TinyUSB_Device_Task(void)
   USBDevice.task();
 }
 
+void TinyUSB_Device_FlushCDC(void)
+{
+  // TODO multiple CDCs
+  tud_cdc_n_write_flush(0);
+}
+
 }
 
 #endif

src/arduino/Adafruit_TinyUSB_API.h

@@ -44,6 +44,9 @@ void TinyUSB_Device_Init(uint8_t rhport) __attribute__((weak));
 // Called by core/sketch to handle device event
 void TinyUSB_Device_Task(void) __attribute__((weak));
 
+// Called by core/sketch to flush write on CDC
+void TinyUSB_Device_FlushCDC(void) __attribute__((weak));
+
 #ifdef __cplusplus
  }
 #endif

src/arduino/Adafruit_USBD_CDC.h

@@ -25,8 +25,11 @@
 #ifndef ADAFRUIT_USBD_CDC_H_
 #define ADAFRUIT_USBD_CDC_H_
 
-#include "Stream.h"
 #include "Adafruit_TinyUSB_API.h"
+
+#ifdef __cplusplus
+
+#include "Stream.h"
 #include "Adafruit_USBD_Interface.h"
 
 class Adafruit_USBD_CDC : public Stream, public Adafruit_USBD_Interface
@@ -72,4 +75,5 @@ class Adafruit_USBD_CDC : public Stream, public Adafruit_USBD_Interface
 
 extern Adafruit_USBD_CDC Serial;
 
+#endif // __cplusplus
 #endif

src/arduino/Adafruit_USBD_Device.cpp

@@ -246,11 +246,6 @@ bool Adafruit_USBD_Device::begin(uint8_t rhport)
 void Adafruit_USBD_Device::task(void)
 {
   tud_task();
-
-#if CFG_TUSB_OS == OPT_OS_NONE || CFG_TUSB_OS == OPT_OS_PICO
-  // flush Serial if we don't use RTOS TODO multiple CDCs
-  tud_cdc_n_write_flush(0);
-#endif
 }
 
 bool Adafruit_USBD_Device::mounted (void)