teensy3: Add support for a third USB serial port

Add support for a triple serial port configuration (USB_TRIPLE_SERIAL),
providing a composite USB device, comprised of three serial ports.
The third serial port is called usb_serial3 (C) or SerialB (C++).

Note that no dummy C++ class is created if USB_DISABLED is defined,
unlike for the first port.

This increases binary size by ca. 0.5 KiB (despite needing 720 more
bytes for USB buffers, as gcc-5.4.1 no longer decides to unroll a loop
over all endpoints in usb_isr()).

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

teensy3/WProgram.h

 #include "avr_emulation.h"
 #include "usb_serial.h"
 #include "usb_serial2.h"
+#include "usb_serial3.h"
 #include "usb_seremu.h"
 #include "usb_keyboard.h"
 #include "usb_mouse.h"

teensy3/usb_desc.c

 #define CDC2_DATA_INTERFACE_DESC_SIZE	0
 #endif
 
-#define MIDI_INTERFACE_DESC_POS		CDC2_DATA_INTERFACE_DESC_POS+CDC2_DATA_INTERFACE_DESC_SIZE
+#define CDC3_DATA_INTERFACE_DESC_POS	CDC2_DATA_INTERFACE_DESC_POS+CDC2_DATA_INTERFACE_DESC_SIZE
+#ifdef  CDC3_DATA_INTERFACE
+#define CDC3_DATA_INTERFACE_DESC_SIZE	8 + 9+5+5+4+5+7+9+7+7
+#else
+#define CDC3_DATA_INTERFACE_DESC_SIZE	0
+#endif
+
+#define MIDI_INTERFACE_DESC_POS		CDC3_DATA_INTERFACE_DESC_POS+CDC3_DATA_INTERFACE_DESC_SIZE
 #ifdef  MIDI_INTERFACE
   #if !defined(MIDI_NUM_CABLES) || MIDI_NUM_CABLES < 1 || MIDI_NUM_CABLES > 16
   #error "MIDI_NUM_CABLES must be defined between 1 to 16"
         EMIT_CDC_DESCRIPTORS(CDC2),
 #endif // CDC2_DATA_INTERFACE
 
+#ifdef CDC3_DATA_INTERFACE
+        EMIT_CDC_IAD_DESCRIPTOR(CDC3),
+        EMIT_CDC_DESCRIPTORS(CDC3),
+#endif // CDC3_DATA_INTERFACE
+
 #ifdef MIDI_INTERFACE
         // Standard MS Interface Descriptor,
         9,                                      // bLength

teensy3/usb_desc.h

   #define ENDPOINT6_CONFIG	ENDPOINT_RECEIVE_ONLY
   #define ENDPOINT7_CONFIG	ENDPOINT_TRANSMIT_ONLY
 
+#elif defined(USB_TRIPLE_SERIAL)
+  #define VENDOR_ID		0x16C0
+  #define PRODUCT_ID		0x0483
+  #define MANUFACTURER_NAME	{'T','e','e','n','s','y','d','u','i','n','o'}
+  #define MANUFACTURER_NAME_LEN	11
+  #define PRODUCT_NAME		{'T','r','i','p','l','e',' ','S','e','r','i','a','l'}
+  #define PRODUCT_NAME_LEN	13
+  #define EP0_SIZE		64
+  #define NUM_ENDPOINTS		10
+  #define NUM_USB_BUFFERS	32
+  #define NUM_INTERFACE		6
+  #define CDC_IAD_DESCRIPTOR	1	// Serial
+  #define CDC_STATUS_INTERFACE	0
+  #define CDC_DATA_INTERFACE	1
+  #define CDC_ACM_ENDPOINT	2
+  #define CDC_RX_ENDPOINT	3
+  #define CDC_TX_ENDPOINT	4
+  #define CDC_ACM_SIZE		16
+  #define CDC_RX_SIZE		64
+  #define CDC_TX_SIZE		64
+  #define CDC2_STATUS_INTERFACE	2	// SerialA
+  #define CDC2_DATA_INTERFACE	3
+  #define CDC2_ACM_ENDPOINT	5
+  #define CDC2_RX_ENDPOINT	6
+  #define CDC2_TX_ENDPOINT	7
+  #define CDC2_ACM_SIZE		16
+  #define CDC2_RX_SIZE		64
+  #define CDC2_TX_SIZE		64
+  #define CDC3_STATUS_INTERFACE	4	// SerialB
+  #define CDC3_DATA_INTERFACE	5
+  #define CDC3_ACM_ENDPOINT	8
+  #define CDC3_RX_ENDPOINT	9
+  #define CDC3_TX_ENDPOINT	10
+  #define CDC3_ACM_SIZE		16
+  #define CDC3_RX_SIZE		64
+  #define CDC3_TX_SIZE		64
+  #define ENDPOINT2_CONFIG	ENDPOINT_TRANSMIT_ONLY
+  #define ENDPOINT3_CONFIG	ENDPOINT_RECEIVE_ONLY
+  #define ENDPOINT4_CONFIG	ENDPOINT_TRANSMIT_ONLY
+  #define ENDPOINT5_CONFIG	ENDPOINT_TRANSMIT_ONLY
+  #define ENDPOINT6_CONFIG	ENDPOINT_RECEIVE_ONLY
+  #define ENDPOINT7_CONFIG	ENDPOINT_TRANSMIT_ONLY
+  #define ENDPOINT8_CONFIG	ENDPOINT_TRANSMIT_ONLY
+  #define ENDPOINT9_CONFIG	ENDPOINT_RECEIVE_ONLY
+  #define ENDPOINT10_CONFIG	ENDPOINT_TRANSMIT_ONLY
+
 #elif defined(USB_KEYBOARDONLY)
   #define VENDOR_ID		0x16C0
   #define PRODUCT_ID		0x04D0

teensy3/usb_dev.c

 			usb_cdc2_line_rtsdtr_millis = systick_millis_count;
 			usb_cdc2_line_rtsdtr = setup.wValue;
 			break;
+#endif
+#ifdef CDC3_STATUS_INTERFACE
+		  case CDC3_STATUS_INTERFACE:
+			usb_cdc3_line_rtsdtr_millis = systick_millis_count;
+			usb_cdc3_line_rtsdtr = setup.wValue;
+			break;
 #endif
 		}
 		//serial_print("set control line state\n");
 			  case CDC2_STATUS_INTERFACE:
 				dst = (uint8_t *)usb_cdc2_line_coding;
 				break;
+#endif
+#ifdef CDC3_STATUS_INTERFACE
+			  case CDC3_STATUS_INTERFACE:
+				dst = (uint8_t *)usb_cdc3_line_coding;
+				break;
 #endif
 			}
 			if (!dst)
 				if (t == 0) usb_serial2_flush_callback();
 			}
 #endif
+#ifdef CDC3_DATA_INTERFACE
+			t = usb_cdc3_transmit_flush_timer;
+			if (t) {
+				usb_cdc3_transmit_flush_timer = --t;
+				if (t == 0) usb_serial3_flush_callback();
+			}
+#endif
 #ifdef SEREMU_INTERFACE
 			t = usb_seremu_transmit_flush_timer;
 			if (t) {

teensy3/usb_dev.h

 #include "usb_serial2.h"
 #endif
 
+#ifdef CDC3_DATA_INTERFACE
+#include "usb_serial3.h"
+#endif
+
 #else // F_CPU < 20000000
 
 #ifdef __cplusplus

teensy3/usb_inst.cpp

 #endif
 #endif
 
+#ifdef CDC3_DATA_INTERFACE
+#ifdef CDC3_STATUS_INTERFACE
+usb_serial3_class SerialB;
+#endif
+#endif
+
 #ifdef MIDI_INTERFACE
 usb_midi_class usbMIDI;
 #endif
 
 #else // F_CPU < 20 MHz
 
-#if defined(USB_SERIAL) || defined(USB_DUAL_SERIAL) || defined(USB_SERIAL_HID)
+#if defined(USB_SERIAL) || defined(USB_DUAL_SERIAL) || \
+    defined(USB_TRIPLE_SERIAL) || defined(USB_SERIAL_HID)
 usb_serial_class Serial;
 #elif (USB_DISABLED)
 usb_serial_class Serial;
 void serialEvent() {}
 void serialEventA() __attribute__((weak));
 void serialEventA() {}
+void serialEventB() __attribute__((weak));
+void serialEventB() {}

teensy3/usb_serial3.c

+/* Teensyduino Core Library
+ * http://www.pjrc.com/teensy/
+ * Copyright (c) 2017 PJRC.COM, LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * 1. The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * 2. If the Software is incorporated into a build system that allows
+ * selection among a list of target devices, then similar target
+ * devices manufactured by PJRC.COM must be included in the list of
+ * target devices and selectable in the same manner.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "usb_dev.h"
+
+// defined by usb_dev.h -> usb_desc.h
+#if defined(CDC3_STATUS_INTERFACE) && defined(CDC3_DATA_INTERFACE)
+
+#if F_CPU >= 20000000
+#include "usb_serial_port.h"
+
+struct usb_serial_port usb_serial3_instance = {
+	.cdc_rx_endpoint	= CDC3_RX_ENDPOINT,
+	.cdc_tx_endpoint	= CDC3_TX_ENDPOINT,
+	.cdc_tx_size		= CDC3_TX_SIZE,
+};
+#endif
+
+#endif // CDC3_STATUS_INTERFACE && CDC3_DATA_INTERFACE

teensy3/usb_serial3.h

+/* Teensyduino Core Library
+ * http://www.pjrc.com/teensy/
+ * Copyright (c) 2017 PJRC.COM, LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * 1. The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * 2. If the Software is incorporated into a build system that allows
+ * selection among a list of target devices, then similar target
+ * devices manufactured by PJRC.COM must be included in the list of
+ * target devices and selectable in the same manner.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef USBserial3_h_
+#define USBserial3_h_
+
+#include "usb_desc.h"
+
+#if defined(CDC3_STATUS_INTERFACE) && defined(CDC3_DATA_INTERFACE)
+#define USB_SERIAL_SUFFIX	3
+#define SERIAL_CLASS_SUFFIX	B
+
+#include "usb_serial_template.h"
+
+#define usb_cdc3_line_coding		usb_serial3_instance.cdc_line_coding
+#define usb_cdc3_line_rtsdtr_millis	usb_serial3_instance.cdc_line_rtsdtr_millis
+#define usb_cdc3_line_rtsdtr		usb_serial3_instance.cdc_line_rtsdtr
+#define usb_cdc3_transmit_flush_timer	usb_serial3_instance.cdc_transmit_flush_timer
+#endif // CDC_STATUS_INTERFACE && CDC_DATA_INTERFACE
+
+#endif // USBserial3_h_

teensy3/usb_undef.h

 #ifdef CDC2_TX_SIZE
 #undef CDC2_TX_SIZE
 #endif
+#ifdef CDC3_STATUS_INTERFACE
+#undef CDC3_STATUS_INTERFACE
+#endif
+#ifdef CDC3_DATA_INTERFACE
+#undef CDC3_DATA_INTERFACE
+#endif
+#ifdef CDC3_ACM_ENDPOINT
+#undef CDC3_ACM_ENDPOINT
+#endif
+#ifdef CDC3_RX_ENDPOINT
+#undef CDC3_RX_ENDPOINT
+#endif
+#ifdef CDC3_TX_ENDPOINT
+#undef CDC3_TX_ENDPOINT
+#endif
+#ifdef CDC3_ACM_SIZE
+#undef CDC3_ACM_SIZE
+#endif
+#ifdef CDC3_RX_SIZE
+#undef CDC3_RX_SIZE
+#endif
+#ifdef CDC3_TX_SIZE
+#undef CDC3_TX_SIZE
+#endif
 #ifdef SEREMU_INTERFACE
 #undef SEREMU_INTERFACE
 #endif

teensy3/yield.cpp

 	if (running) return; // TODO: does this need to be atomic?
 	running = 1;
 	if (Serial.available()) serialEvent();
-#ifdef USB_DUAL_SERIAL
+#if defined(USB_DUAL_SERIAL) || defined(USB_TRIPLE_SERIAL)
 	if (SerialA.available()) serialEventA();
+#endif
+#ifdef USB_TRIPLE_SERIAL
+	if (SerialB.available()) serialEventB();
 #endif
 	if (Serial1.available()) serialEvent1();
 	if (Serial2.available()) serialEvent2();