Initial commit

.gitignore

@@ -0,0 +1,8 @@
+BaitAndSwitch.bin
+BaitAndSwitch.eep
+BaitAndSwitch.elf
+BaitAndSwitch.hex
+BaitAndSwitch.lss
+BaitAndSwitch.map
+BaitAndSwitch.sym
+obj

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "lufa"]
+	path = lufa
+	url = https://github.com/abcminiuser/lufa.git

Config/LUFAConfig.h

@@ -0,0 +1,7 @@
+#pragma once
+#define USE_STATIC_OPTIONS               (USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)
+#define USB_DEVICE_ONLY
+#define USE_FLASH_DESCRIPTORS
+#define FIXED_CONTROL_ENDPOINT_SIZE      8
+#define FIXED_NUM_CONFIGURATIONS         1
+#define INTERRUPT_CONTROL_ENDPOINT

board.h

@@ -0,0 +1,34 @@
+#pragma once
+#include <avr/io.h>
+#include <stdio.h>
+
+extern FILE USBSerialStream;
+
+#define SET_FUN_N(NAME, PORT, PIN) inline static void NAME(void) { PORT |=  (1<<PIN); }
+#define CLR_FUN_N(NAME, PORT, PIN) inline static void NAME(void) { PORT &= ~(1<<PIN); }
+#define GET_FUN_N(NAME, PORT, PIN) inline static int NAME(void) { return !!(PORT & (1<<PIN)); }
+
+#define PIN_FUN_N(NAME, PORT_NAME, PIN_NUM) \
+	SET_FUN_N(NAME##On, PORT##PORT_NAME, PIN_NUM) \
+	CLR_FUN_N(NAME##Off, PORT##PORT_NAME, PIN_NUM) \
+	GET_FUN_N(NAME##Pin, PIN##PORT_NAME, PIN_NUM) \
+	GET_FUN_N(NAME##Port, PORT##PORT_NAME, PIN_NUM)
+
+#define SET_FUN_I(NAME, PORT, PIN) inline static void NAME(void) { PORT &= ~(1<<PIN); }
+#define CLR_FUN_I(NAME, PORT, PIN) inline static void NAME(void) { PORT |=  (1<<PIN); }
+#define GET_FUN_I(NAME, PORT, PIN) inline static int NAME(void) { return !(PORT & (1<<PIN)); }
+
+#define PIN_FUN_I(NAME, PORT_NAME, PIN_NUM) \
+	SET_FUN_I(NAME##On, PORT##PORT_NAME, PIN_NUM) \
+	CLR_FUN_I(NAME##Off, PORT##PORT_NAME, PIN_NUM) \
+	GET_FUN_I(NAME##Pin, PIN##PORT_NAME, PIN_NUM) \
+	GET_FUN_I(NAME##Port, PORT##PORT_NAME, PIN_NUM)
+
+PIN_FUN_N(SysLed, B, 7)
+PIN_FUN_N(PortAInd, D, 0)
+PIN_FUN_N(PortBInd, D, 2)
+PIN_FUN_N(PortAPow, D, 1)
+PIN_FUN_N(PortBPow, D, 3)
+PIN_FUN_I(OutEn, D, 4)
+PIN_FUN_I(CtrlData, D, 5)
+PIN_FUN_N(DutData, D, 5)

commands.c

@@ -0,0 +1,114 @@
+#include "board.h"
+#include "commands.h"
+#include "usb.h"
+#include "main.h"
+#include <LUFA/Drivers/USB/USB.h>
+
+extern FILE USBSerialStream;
+
+static void DB(char const *s) {
+	if (connected) {
+		fputs(s, &USBSerialStream);
+		fputs("\r\n", &USBSerialStream);
+	}
+}
+
+void connectCTL(void) {
+	DB("CC");
+	connectPowerCTL();
+	disconnectPowerDUT();
+	connectDataCTL();
+}
+
+void connectDUT(void) {
+	DB("CD");
+	connectPowerDUT();
+	disconnectPowerCTL();
+	connectDataDUT();
+}
+
+void connectDataCTL(void) {
+	DB("CDC");
+	PortBIndOff();
+	CtrlDataOn();
+	OutEnOn();
+	PortAIndOn();
+}
+
+void connectDataDUT(void) {
+	DB("CDD");
+	PortAIndOff();
+	DutDataOn();
+	OutEnOn();
+	PortBIndOn();
+}
+
+void connectPowerCTL(void) {
+	DB("CPC");
+	PortAPowOn();
+}
+
+void connectPowerDUT(void) {
+	DB("CPD");
+	PortBPowOn();
+}
+
+void disconnect(void) {
+	DB("D");
+	disconnectData();
+	disconnectPower();
+}
+
+void disconnectData(void) {
+	DB("DD");
+	OutEnOff();
+	PortAIndOff();
+	PortBIndOff();
+}
+
+void disconnectPower(void) {
+	DB("DP");
+	disconnectPowerCTL();
+	disconnectPowerDUT();
+}
+
+void disconnectPowerCTL(void) {
+	DB("DPC");
+	PortAPowOff();
+}
+
+void disconnectPowerDUT(void) {
+	DB("DPD");
+	PortBPowOff();
+}
+
+void clearID(void) {
+	DB("CI");
+	SysLedOff();
+}
+
+void setID(void) {
+	DB("SI");
+	SysLedOn();
+}
+
+void status(void) {
+	char buf[30];
+	snprintf(buf, sizeof buf,
+			"PC:%d, PD:%d, "
+			"DT:%s\r\n"
+			, PortAPowPort(), PortBPowPort()
+			, OutEnPort() ? (CtrlDataPort() ? "Ctrl" : "DUT") : "off"
+			);
+	CDC_Device_SendString(&VirtualSerial_CDC_Interface, buf);
+}
+
+void debug(void) {
+	char buf[20];
+	snprintf(buf, sizeof buf,
+			"(%02x %02x %02x)\r\n"
+			, (unsigned) (PINB & 0x87), (unsigned) (PINC & 0xF6), (unsigned) (PIND & 0xFF)
+			);
+	CDC_Device_SendString(&VirtualSerial_CDC_Interface, buf);
+}
+

commands.h

@@ -0,0 +1,16 @@
+#pragma once
+void connectCTL(void);
+void connectDUT(void);
+void connectDataCTL(void);
+void connectDataDUT(void);
+void connectPowerCTL(void);
+void connectPowerDUT(void);
+void disconnect(void);
+void disconnectData(void);
+void disconnectPower(void);
+void disconnectPowerCTL(void);
+void disconnectPowerDUT(void);
+void clearID(void);
+void setID(void);
+void status(void);
+void debug(void);

descriptors.c

@@ -0,0 +1,180 @@
+#include "descriptors.h"
+
+
+const USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
+{
+	.Header                 = {.Size = sizeof(USB_Descriptor_Device_t), .Type = DTYPE_Device},
+
+	.USBSpecification       = VERSION_BCD(1,1,0),
+	.Class                  = CDC_CSCP_CDCClass,
+	.SubClass               = CDC_CSCP_NoSpecificSubclass,
+	.Protocol               = CDC_CSCP_NoSpecificProtocol,
+
+	.Endpoint0Size          = FIXED_CONTROL_ENDPOINT_SIZE,
+
+	.VendorID               = 0x03EB,
+	.ProductID              = 0x2044,
+	.ReleaseNumber          = VERSION_BCD(0,0,1),
+
+	.ManufacturerStrIndex   = STRING_ID_Manufacturer,
+	.ProductStrIndex        = STRING_ID_Product,
+	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
+
+	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
+};
+
+const USB_Descriptor_Configuration_t PROGMEM ConfigurationDescriptor =
+{
+	.Config =
+		{
+			.Header                 = {.Size = sizeof(USB_Descriptor_Configuration_Header_t), .Type = DTYPE_Configuration},
+
+			.TotalConfigurationSize = sizeof(USB_Descriptor_Configuration_t),
+			.TotalInterfaces        = 2,
+
+			.ConfigurationNumber    = 1,
+			.ConfigurationStrIndex  = NO_DESCRIPTOR,
+
+			.ConfigAttributes       = (USB_CONFIG_ATTR_RESERVED | USB_CONFIG_ATTR_SELFPOWERED),
+
+			.MaxPowerConsumption    = USB_CONFIG_POWER_MA(100)
+		},
+
+	.CDC_CCI_Interface =
+		{
+			.Header                 = {.Size = sizeof(USB_Descriptor_Interface_t), .Type = DTYPE_Interface},
+
+			.InterfaceNumber        = INTERFACE_ID_CDC_CCI,
+			.AlternateSetting       = 0,
+
+			.TotalEndpoints         = 1,
+
+			.Class                  = CDC_CSCP_CDCClass,
+			.SubClass               = CDC_CSCP_ACMSubclass,
+			.Protocol               = CDC_CSCP_ATCommandProtocol,
+
+			.InterfaceStrIndex      = NO_DESCRIPTOR
+		},
+
+	.CDC_Functional_Header =
+		{
+			.Header                 = {.Size = sizeof(USB_CDC_Descriptor_FunctionalHeader_t), .Type = CDC_DTYPE_CSInterface},
+			.Subtype                = CDC_DSUBTYPE_CSInterface_Header,
+
+			.CDCSpecification       = VERSION_BCD(1,1,0),
+		},
+
+	.CDC_Functional_ACM =
+		{
+			.Header                 = {.Size = sizeof(USB_CDC_Descriptor_FunctionalACM_t), .Type = CDC_DTYPE_CSInterface},
+			.Subtype                = CDC_DSUBTYPE_CSInterface_ACM,
+
+			.Capabilities           = 0x06,
+		},
+
+	.CDC_Functional_Union =
+		{
+			.Header                 = {.Size = sizeof(USB_CDC_Descriptor_FunctionalUnion_t), .Type = CDC_DTYPE_CSInterface},
+			.Subtype                = CDC_DSUBTYPE_CSInterface_Union,
+
+			.MasterInterfaceNumber  = INTERFACE_ID_CDC_CCI,
+			.SlaveInterfaceNumber   = INTERFACE_ID_CDC_DCI,
+		},
+
+	.CDC_NotificationEndpoint =
+		{
+			.Header                 = {.Size = sizeof(USB_Descriptor_Endpoint_t), .Type = DTYPE_Endpoint},
+
+			.EndpointAddress        = CDC_NOTIFICATION_EPADDR,
+			.Attributes             = (EP_TYPE_INTERRUPT | ENDPOINT_ATTR_NO_SYNC | ENDPOINT_USAGE_DATA),
+			.EndpointSize           = CDC_NOTIFICATION_EPSIZE,
+			.PollingIntervalMS      = 0xFF
+		},
+
+	.CDC_DCI_Interface =
+		{
+			.Header                 = {.Size = sizeof(USB_Descriptor_Interface_t), .Type = DTYPE_Interface},
+
+			.InterfaceNumber        = INTERFACE_ID_CDC_DCI,
+			.AlternateSetting       = 0,
+
+			.TotalEndpoints         = 2,
+
+			.Class                  = CDC_CSCP_CDCDataClass,
+			.SubClass               = CDC_CSCP_NoDataSubclass,
+			.Protocol               = CDC_CSCP_NoDataProtocol,
+
+			.InterfaceStrIndex      = NO_DESCRIPTOR
+		},
+
+	.CDC_DataOutEndpoint =
+		{
+			.Header                 = {.Size = sizeof(USB_Descriptor_Endpoint_t), .Type = DTYPE_Endpoint},
+
+			.EndpointAddress        = CDC_RX_EPADDR,
+			.Attributes             = (EP_TYPE_BULK | ENDPOINT_ATTR_NO_SYNC | ENDPOINT_USAGE_DATA),
+			.EndpointSize           = CDC_TXRX_EPSIZE,
+			.PollingIntervalMS      = 0x05
+		},
+
+	.CDC_DataInEndpoint =
+		{
+			.Header                 = {.Size = sizeof(USB_Descriptor_Endpoint_t), .Type = DTYPE_Endpoint},
+
+			.EndpointAddress        = CDC_TX_EPADDR,
+			.Attributes             = (EP_TYPE_BULK | ENDPOINT_ATTR_NO_SYNC | ENDPOINT_USAGE_DATA),
+			.EndpointSize           = CDC_TXRX_EPSIZE,
+			.PollingIntervalMS      = 0x05
+		}
+};
+
+const USB_Descriptor_String_t PROGMEM LanguageString = USB_STRING_DESCRIPTOR_ARRAY(LANGUAGE_ID_ENG);
+
+const USB_Descriptor_String_t PROGMEM ManufacturerString = USB_STRING_DESCRIPTOR(L"LUFA Library");
+
+const USB_Descriptor_String_t PROGMEM ProductString = USB_STRING_DESCRIPTOR(L"LUFA CDC Demo");
+
+uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
+                                    const uint16_t wIndex,
+                                    const void** const DescriptorAddress)
+{
+	const uint8_t  DescriptorType   = (wValue >> 8);
+	const uint8_t  DescriptorNumber = (wValue & 0xFF);
+
+	const void* Address = NULL;
+	uint16_t    Size    = NO_DESCRIPTOR;
+
+	switch (DescriptorType)
+	{
+		case DTYPE_Device:
+			Address = &DeviceDescriptor;
+			Size    = sizeof(USB_Descriptor_Device_t);
+			break;
+		case DTYPE_Configuration:
+			Address = &ConfigurationDescriptor;
+			Size    = sizeof(USB_Descriptor_Configuration_t);
+			break;
+		case DTYPE_String:
+			switch (DescriptorNumber)
+			{
+				case STRING_ID_Language:
+					Address = &LanguageString;
+					Size    = pgm_read_byte(&LanguageString.Header.Size);
+					break;
+				case STRING_ID_Manufacturer:
+					Address = &ManufacturerString;
+					Size    = pgm_read_byte(&ManufacturerString.Header.Size);
+					break;
+				case STRING_ID_Product:
+					Address = &ProductString;
+					Size    = pgm_read_byte(&ProductString.Header.Size);
+					break;
+			}
+
+			break;
+	}
+
+	*DescriptorAddress = Address;
+	return Size;
+}
+

descriptors.h

@@ -0,0 +1,110 @@
+/*
+             LUFA Library
+     Copyright (C) Dean Camera, 2021.
+
+  dean [at] fourwalledcubicle [dot] com
+           www.lufa-lib.org
+*/
+
+/*
+  Copyright 2021  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+  Permission to use, copy, modify, distribute, and sell this
+  software and its documentation for any purpose is hereby granted
+  without fee, provided that the above copyright notice appear in
+  all copies and that both that the copyright notice and this
+  permission notice and warranty disclaimer appear in supporting
+  documentation, and that the name of the author not be used in
+  advertising or publicity pertaining to distribution of the
+  software without specific, written prior permission.
+
+  The author disclaims all warranties with regard to this
+  software, including all implied warranties of merchantability
+  and fitness.  In no event shall the author be liable for any
+  special, indirect or consequential damages or any damages
+  whatsoever resulting from loss of use, data or profits, whether
+  in an action of contract, negligence or other tortious action,
+  arising out of or in connection with the use or performance of
+  this software.
+*/
+
+/** \file
+ *
+ *  Header file for Descriptors.c.
+ */
+
+#ifndef _DESCRIPTORS_H_
+#define _DESCRIPTORS_H_
+
+	/* Includes: */
+		#include <avr/pgmspace.h>
+
+		#include <LUFA/Drivers/USB/USB.h>
+
+	/* Macros: */
+		/** Endpoint address of the CDC device-to-host notification IN endpoint. */
+		#define CDC_NOTIFICATION_EPADDR        (ENDPOINT_DIR_IN  | 2)
+
+		/** Endpoint address of the CDC device-to-host data IN endpoint. */
+		#define CDC_TX_EPADDR                  (ENDPOINT_DIR_IN  | 3)
+
+		/** Endpoint address of the CDC host-to-device data OUT endpoint. */
+		#define CDC_RX_EPADDR                  (ENDPOINT_DIR_OUT | 4)
+
+		/** Size in bytes of the CDC device-to-host notification IN endpoint. */
+		#define CDC_NOTIFICATION_EPSIZE        8
+
+		/** Size in bytes of the CDC data IN and OUT endpoints. */
+		#define CDC_TXRX_EPSIZE                16
+
+	/* Type Defines: */
+		/** Type define for the device configuration descriptor structure. This must be defined in the
+		 *  application code, as the configuration descriptor contains several sub-descriptors which
+		 *  vary between devices, and which describe the device's usage to the host.
+		 */
+		typedef struct
+		{
+			USB_Descriptor_Configuration_Header_t    Config;
+
+			// CDC Control Interface
+			USB_Descriptor_Interface_t               CDC_CCI_Interface;
+			USB_CDC_Descriptor_FunctionalHeader_t    CDC_Functional_Header;
+			USB_CDC_Descriptor_FunctionalACM_t       CDC_Functional_ACM;
+			USB_CDC_Descriptor_FunctionalUnion_t     CDC_Functional_Union;
+			USB_Descriptor_Endpoint_t                CDC_NotificationEndpoint;
+
+			// CDC Data Interface
+			USB_Descriptor_Interface_t               CDC_DCI_Interface;
+			USB_Descriptor_Endpoint_t                CDC_DataOutEndpoint;
+			USB_Descriptor_Endpoint_t                CDC_DataInEndpoint;
+		} USB_Descriptor_Configuration_t;
+
+		/** Enum for the device interface descriptor IDs within the device. Each interface descriptor
+		 *  should have a unique ID index associated with it, which can be used to refer to the
+		 *  interface from other descriptors.
+		 */
+		enum InterfaceDescriptors_t
+		{
+			INTERFACE_ID_CDC_CCI = 0, /**< CDC CCI interface descriptor ID */
+			INTERFACE_ID_CDC_DCI = 1, /**< CDC DCI interface descriptor ID */
+		};
+
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum StringDescriptors_t
+		{
+			STRING_ID_Language     = 0, /**< Supported Languages string descriptor ID (must be zero) */
+			STRING_ID_Manufacturer = 1, /**< Manufacturer string ID */
+			STRING_ID_Product      = 2, /**< Product string ID */
+		};
+
+	/* Function Prototypes: */
+		uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue,
+		                                    const uint16_t wIndex,
+		                                    const void** const DescriptorAddress)
+		                                    ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(3);
+
+#endif
+

lufa

@@ -0,0 +1 @@
+Subproject commit 15cf7809c7d9e7a6e42f256309dd965b6c8cc20b

main.c

@@ -0,0 +1,141 @@
+#include "main.h"
+#include "board.h"
+#include "commands.h"
+#include "usb.h"
+
+static void GPIO_Init();
+static void HandleSerialByte(uint8_t);
+
+int main(void)
+{
+	GlobalInterruptEnable();
+	SetupHardware();
+
+	/* Create a regular character stream for the interface so that it can be used with the stdio.h functions */
+	CDC_Device_CreateStream(&VirtualSerial_CDC_Interface, &USBSerialStream);
+
+	for (;;)
+	{
+		CheckInputs();
+		
+		CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
+		USB_USBTask();
+
+		/* Must read data from the host, or it will lock up while waiting for the device */
+		int16_t data = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
+		if (data >= 0) {
+			HandleSerialByte((uint8_t)(data & 0xFF));
+		}
+
+		CDC_Device_USBTask(&VirtualSerial_CDC_Interface);
+		USB_USBTask();
+	}
+}
+
+/** Configures the board hardware and chip peripherals for the demo's functionality. */
+void SetupHardware(void)
+{
+	/* Disable watchdog if enabled by bootloader/fuses */
+	MCUSR &= ~(1 << WDRF);
+	wdt_disable();
+
+	/* Disable clock division */
+	clock_prescale_set(clock_div_1);
+
+	/* Hardware Initialization */
+	GPIO_Init();
+	USB_Init();
+}
+
+void GPIO_Init() {
+	// Port B:
+	// 0, 1, 2: Inputs Disconnect, Sel B, Sel A -> Pullup
+	// 7: SYS_LED
+	DDRB = 1<<7;
+	PINB |= (1 << 0) | (1 << 1) | (1 << 2);
+	// Port C:
+	// 2, 4, 5, 6, 7: C_SENSE, VBUS_CTRL_DET, HS, ~USBON, VBUS_DUT_DET
+	// DDRC = 0;
+	// Port D:
+	// 0, 1: IND_PORTA, EN_POW_CTRL
+	// 2, 3: IND_PORTB, EN_POW_DUT
+	// 4: ~OE
+	// 5: ~CTRL/DUT
+	// 6: UNRST
+	// 7: 5VMCU
+	DDRD = ~((1<<7) | (1<<6));
+}
+
+static int gotCommand = 0;
+void CheckInputs(void)
+{
+	uint8_t portValue = (~PINB) & 7;
+	static int lV = 0;
+	if ((portValue == 0 || portValue == lV) && !gotCommand) {
+		return;
+	}
+
+	lV = portValue;
+	gotCommand = 0;
+
+	if (portValue & (1<<0)) {
+		disconnect();
+	} else if (portValue & (1<<1)) {
+		connectDUT();
+	} else if (portValue & (1<<2)) {
+		connectCTL();
+	}
+}
+
+static const struct {
+	char const *name;
+	void (*fun)(void);
+} commands[] = {
+	{ "C", connectCTL },
+	{ "PC", connectPowerCTL },
+	{ "DC", connectDataCTL },
+	{ "D", connectDUT },
+	{ "PD", connectPowerDUT },
+	{ "DD", connectDataDUT },
+	{ "dPC", disconnectPowerCTL },
+	{ "dPD", disconnectPowerDUT },
+	{ "dP", disconnectPower },
+	{ "dD", disconnectData },
+	{ "d", disconnect },
+	{ "I", setID },
+	{ "i", clearID },
+	{ "s", status },
+	{ "x", debug }
+};
+
+static void HandleCommand(char *cmd, int cmdLen) {
+	for (int i = 0; i < (sizeof commands) / (sizeof commands[0]); i++) {
+		if (!strncmp(commands[i].name, cmd, cmdLen)) {
+			gotCommand = 1;
+			commands[i].fun();
+			return;
+		}
+	}
+
+	fputs("Unknown command\r\n", &USBSerialStream);
+}
+
+static void HandleSerialByte(uint8_t b) {
+	static char cmd[64];
+	static int cmdLen = 0;
+
+	if (b != '\r' && b != '\n') {
+		if (cmdLen < sizeof cmd - 1) {
+			cmd[cmdLen++] = b;
+			fputc(b, &USBSerialStream);
+		}
+	} else {
+		if (cmdLen > 0) {
+			fputs("\r\n", &USBSerialStream);
+			CDC_Device_Flush(&VirtualSerial_CDC_Interface);
+			cmd[cmdLen] = '\0';
+			HandleCommand(cmd, cmdLen);
+			cmdLen = 0; 
+		}
+	}
+}

main.h

@@ -0,0 +1,22 @@
+#pragma once
+#include <avr/io.h>
+#include <avr/wdt.h>
+#include <avr/power.h>
+#include <avr/interrupt.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "descriptors.h"
+
+#include <LUFA/Drivers/USB/USB.h>
+#include <LUFA/Platform/Platform.h>
+
+void SetupHardware(void);
+void CheckInputs(void);
+
+void EVENT_USB_Device_Connect(void);
+void EVENT_USB_Device_Disconnect(void);
+void EVENT_USB_Device_ConfigurationChanged(void);
+void EVENT_USB_Device_ControlRequest(void);
+
+extern USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface;

makefile

@@ -0,0 +1,42 @@
+#
+#             LUFA Library
+#     Copyright (C) Dean Camera, 2021.
+#
+#  dean [at] fourwalledcubicle [dot] com
+#           www.lufa-lib.org
+#
+# --------------------------------------
+#         LUFA Project Makefile.
+# --------------------------------------
+
+# Run "make help" for target help.
+
+MCU          = atmega16u2
+ARCH         = AVR8
+F_CPU        = 16000000
+F_USB        = $(F_CPU)
+OPTIMIZATION = s
+TARGET       = BaitAndSwitch
+SRC          = main.c descriptors.c $(LUFA_SRC_USB) $(LUFA_SRC_USBCLASS) usb.c commands.c
+LUFA_PATH    = lufa/LUFA
+CC_FLAGS     = -DUSE_LUFA_CONFIG_HEADER -IConfig/
+LD_FLAGS     =
+
+# Default target
+all:
+
+# Include LUFA-specific DMBS extension modules
+DMBS_LUFA_PATH ?= $(LUFA_PATH)/Build/LUFA
+include $(DMBS_LUFA_PATH)/lufa-sources.mk
+include $(DMBS_LUFA_PATH)/lufa-gcc.mk
+
+# Include common DMBS build system modules
+DMBS_PATH      ?= $(LUFA_PATH)/Build/DMBS/DMBS
+include $(DMBS_PATH)/core.mk
+include $(DMBS_PATH)/cppcheck.mk
+include $(DMBS_PATH)/doxygen.mk
+include $(DMBS_PATH)/dfu.mk
+include $(DMBS_PATH)/gcc.mk
+include $(DMBS_PATH)/hid.mk
+include $(DMBS_PATH)/avrdude.mk
+include $(DMBS_PATH)/atprogram.mk

usb.c

@@ -0,0 +1,70 @@
+#include "main.h"
+#include "board.h"
+
+int connected = 0;
+
+FILE USBSerialStream;
+
+USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
+	{
+		.Config =
+			{
+				.ControlInterfaceNumber   = INTERFACE_ID_CDC_CCI,
+				.DataINEndpoint           =
+					{
+						.Address          = CDC_TX_EPADDR,
+						.Size             = CDC_TXRX_EPSIZE,
+						.Banks            = 1,
+					},
+				.DataOUTEndpoint =
+					{
+						.Address          = CDC_RX_EPADDR,
+						.Size             = CDC_TXRX_EPSIZE,
+						.Banks            = 1,
+					},
+				.NotificationEndpoint =
+					{
+						.Address          = CDC_NOTIFICATION_EPADDR,
+						.Size             = CDC_NOTIFICATION_EPSIZE,
+						.Banks            = 1,
+					},
+			},
+	};
+
+void EVENT_USB_Device_Connect(void)
+{
+}
+
+void EVENT_USB_Device_Disconnect(void)
+{
+	SysLedOff();
+	connected = 0;
+}
+
+void EVENT_USB_Device_ConfigurationChanged(void)
+{
+	bool ConfigSuccess = true;
+
+	ConfigSuccess &= CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
+
+	if (ConfigSuccess) {
+		SysLedOn();
+	}
+}
+
+void EVENT_USB_Device_ControlRequest(void)
+{
+	CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
+}
+
+void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t *const CDCInterfaceInfo)
+{
+	bool HostReady = (CDCInterfaceInfo->State.ControlLineStates.HostToDevice & CDC_CONTROL_LINE_OUT_DTR) != 0;
+	connected = HostReady;
+	if (connected) {
+		SysLedOn();
+	} else {
+		SysLedOff();
+	}
+}
+

usb.h

@@ -0,0 +1,3 @@
+#pragma once
+
+extern int connected;