Add availableForWrite method to Serial.

Author: pyro9

cores/nRF5/Adafruit_TinyUSB_Core/Adafruit_USBD_CDC.cpp

@@ -125,6 +125,11 @@ size_t Adafruit_USBD_CDC::write(const uint8_t *buffer, size_t size)
   return size - remain;
 }
 
+size_t Adafruit_USBD_CDC::availableForWrite(void)
+{
+  return tud_cdc_availableForWrite();
+}
+
 extern "C"
 {
 

cores/nRF5/Adafruit_TinyUSB_Core/Adafruit_USBD_CDC.h

@@ -50,6 +50,7 @@ class Adafruit_USBD_CDC : public Stream, Adafruit_USBD_Interface
 	size_t write(const char *buffer, size_t size) {
 	  return write((const uint8_t *)buffer, size);
 	}
+        size_t availableForWrite(void);
 	operator bool();
 };
 

cores/nRF5/Adafruit_TinyUSB_Core/tinyusb/src/class/cdc/cdc_device.c

@@ -190,6 +190,11 @@ bool tud_cdc_n_write_flush (uint8_t itf)
   return true;
 }
 
+uint32_t tud_cdc_n_availableForWrite (uint8_t itf)
+{
+  return CFG_TUD_CDC_TX_BUFSIZE - tu_fifo_count(&_cdcd_itf[itf].tx_ff);
+}
+
 
 //--------------------------------------------------------------------+
 // USBD Driver API

cores/nRF5/Adafruit_TinyUSB_Core/tinyusb/src/class/cdc/cdc_device.h

@@ -66,6 +66,7 @@ uint32_t    tud_cdc_n_write_char      (uint8_t itf, char ch);
 uint32_t    tud_cdc_n_write           (uint8_t itf, void const* buffer, uint32_t bufsize);
 uint32_t    tud_cdc_n_write_str       (uint8_t itf, char const* str);
 bool        tud_cdc_n_write_flush     (uint8_t itf);
+uint32_t    tud_cdc_n_availableForWrite (uint8_t itf);
 
 //--------------------------------------------------------------------+
 // Application API (Interface0)
@@ -85,6 +86,7 @@ static inline uint32_t    tud_cdc_write_char      (char ch);
 static inline uint32_t    tud_cdc_write           (void const* buffer, uint32_t bufsize);
 static inline uint32_t    tud_cdc_write_str       (char const* str);
 static inline bool        tud_cdc_write_flush     (void);
+static inline uint32_t    tud_cdc_availableForWrite(void);
 
 //--------------------------------------------------------------------+
 // Application Callback API (weak is optional)
@@ -170,6 +172,11 @@ static inline bool tud_cdc_write_flush (void)
   return tud_cdc_n_write_flush(0);
 }
 
+static inline uint32_t tud_cdc_availableForWrite(void)
+{
+  return tud_cdc_n_availableForWrite(0);
+}
+
 /** @} */
 /** @} */