change Adafruit_USBH_CDC to inherit HardwareSerial (instead of Stream)

change begin(idx) to setInterfaceIndex(idx), to allow using begin(baud)
as other API. Update example accordingly

Author: hathach

examples/DualRole/serial_host_bridge/serial_host_bridge.ino

@@ -138,14 +138,15 @@ void loop1()
 // idx is index of cdc interface in the internal pool.
 void tuh_cdc_mount_cb(uint8_t idx) {
   // bind SerialHost object to this interface index
-  SerialHost.begin(idx);
+  SerialHost.setInterfaceIndex(idx);
+  SerialHost.begin(115200);
 
   Serial.println("SerialHost is connected to a new CDC device");
 }
 
 // Invoked when a device with CDC interface is unmounted
 void tuh_cdc_umount_cb(uint8_t idx) {
-  if (idx == SerialHost.getIndex()) {
+  if (idx == SerialHost.getInterfaceIndex()) {
     // unbind SerialHost if this interface is unmounted
     SerialHost.end();
 

src/arduino/cdc/Adafruit_USBH_CDC.cpp

@@ -32,7 +32,23 @@
 
 Adafruit_USBH_CDC::Adafruit_USBH_CDC(void) { _idx = TUSB_INDEX_INVALID; }
 
-void Adafruit_USBH_CDC::begin(uint8_t idx) { _idx = idx; }
+void Adafruit_USBH_CDC::begin(unsigned long baud) {
+
+  // default to index 0 when begin
+  if (_idx == TUSB_INDEX_INVALID) {
+    _idx = 0;
+  }
+
+  _baud = baud;
+  if (_baud == 0) {
+    _baud = 115200; // default, backward compatible with previous API begin(0)
+  }
+}
+
+void Adafruit_USBH_CDC::begin(unsigned long baudrate, uint16_t config) {
+  (void)config; // TODO support line coding later
+  begin(115200);
+}
 
 void Adafruit_USBH_CDC::end(void) { _idx = TUSB_INDEX_INVALID; }
 

src/arduino/cdc/Adafruit_USBH_CDC.h

@@ -25,21 +25,22 @@
 #ifndef ADAFRUIT_USBH_CDC_H_
 #define ADAFRUIT_USBH_CDC_H_
 
-#include "Stream.h"
+#include "HardwareSerial.h"
 
-class Adafruit_USBH_CDC : public Stream {
+class Adafruit_USBH_CDC : public HardwareSerial {
 public:
   Adafruit_USBH_CDC(void);
 
-  // Init/Bind to an specific cdc interface
-  void begin(uint8_t idx = 0);
+  // Set/Get index of cdc interface
+  void setInterfaceIndex(uint8_t idx) { _idx = idx; }
+  uint8_t getInterfaceIndex(void) { return _idx; }
+
+  void begin(unsigned long baudrate);
+  void begin(unsigned long baudrate, uint16_t config);
 
   // unbind cdc interface
   void end(void);
 
-  // Get index of cdc interface
-  uint8_t getIndex(void) { return _idx; }
-
   // If cdc is mounted
   bool mounted(void);
   operator bool() { return mounted(); }
@@ -67,6 +68,7 @@ class Adafruit_USBH_CDC : public Stream {
 
 private:
   uint8_t _idx; // TinyUSB CDC Interface Index
+  uint32_t _baud;
 };
 
 #endif