move tud cdc write flush to yield(), add yield() to Stream timeRead(), timePeek()

Author: hathach

cores/nRF5/Adafruit_TinyUSB_Core/Adafruit_USBD_CDC.cpp

@@ -82,11 +82,6 @@ int Adafruit_USBD_CDC::read(void)
   return (int) tud_cdc_read_char();
 }
 
-size_t Adafruit_USBD_CDC::readBytes(char *buffer, size_t length)
-{
-  return tud_cdc_read(buffer, length);
-}
-
 void Adafruit_USBD_CDC::flush(void)
 {
   tud_cdc_write_flush();

cores/nRF5/Adafruit_TinyUSB_Core/Adafruit_USBD_CDC.h

@@ -51,9 +51,6 @@ class Adafruit_USBD_CDC : public Stream, Adafruit_USBD_Interface
 	  return write((const uint8_t *)buffer, size);
 	}
 	operator bool();
-
-	size_t readBytes(char *buffer, size_t length);
-	size_t readBytes(uint8_t *buffer, size_t length) { return readBytes((char *)buffer, length); }
 };
 
 extern Adafruit_USBD_CDC Serial;

cores/nRF5/Stream.cpp

@@ -35,6 +35,7 @@ int Stream::timedRead()
   do {
     c = read();
     if (c >= 0) return c;
+    yield(); // running TinyUSB task
   } while(millis() - _startMillis < _timeout);
   return -1;     // -1 indicates timeout
 }
@@ -47,6 +48,7 @@ int Stream::timedPeek()
   do {
     c = peek();
     if (c >= 0) return c;
+    yield(); // running TinyUSB task
   } while(millis() - _startMillis < _timeout);
   return -1;     // -1 indicates timeout
 }

cores/nRF5/main.cpp

@@ -56,10 +56,7 @@ static void loop_task(void* arg)
   while (1)
   {
     loop();
-
-#ifdef USE_TINYUSB
-    tud_cdc_write_flush();
-#endif
+    yield(); // yield run usb background task
 
     // Serial events
     if (serialEvent && serialEventRun) serialEventRun();

cores/nRF5/rtos.cpp

@@ -38,11 +38,6 @@
 
 SchedulerRTOS Scheduler;
 
-void yield(void)
-{
-  taskYIELD();
-}
-
 static void _redirect_task(void* arg)
 {
   SchedulerRTOS::taskfunc_t taskfunc = (SchedulerRTOS::taskfunc_t) arg;
@@ -81,12 +76,21 @@ bool SchedulerRTOS::startLoop(taskfunc_t task, const char* name, uint32_t stack_
 
 
 //--------------------------------------------------------------------+
-// FreeRTOS Hooks
+// Hooks
 //--------------------------------------------------------------------+
 
 extern "C"
 {
 
+void yield(void)
+{
+#ifdef USE_TINYUSB
+    tud_cdc_write_flush();
+#endif
+
+  taskYIELD();
+}
+
 void vApplicationStackOverflowHook( TaskHandle_t xTask, char *pcTaskName )
 {
   LOG_LV1("RTOS", "%s Stack Overflow !!!", pcTaskName);