From d23da1981184b367ca74146a830e279861d31e00 Mon Sep 17 00:00:00 2001 From: Olaf Rempel Date: Sun, 31 Jan 2021 21:00:05 +0100 Subject: [PATCH] Initial commit --- .gitmodules | 3 + Descriptors.c | 222 ++++++++++++++++++++++++++++++++++++++++++++++++++ Descriptors.h | 110 +++++++++++++++++++++++++ LUFA | 1 + LUFAConfig.h | 86 +++++++++++++++++++ Makefile | 38 +++++++++ main.c | 181 ++++++++++++++++++++++++++++++++++++++++ 7 files changed, 641 insertions(+) create mode 100644 .gitmodules create mode 100644 Descriptors.c create mode 100644 Descriptors.h create mode 160000 LUFA create mode 100644 LUFAConfig.h create mode 100644 Makefile create mode 100644 main.c diff --git a/.gitmodules b/.gitmodules new file mode 100644 index 0000000..91cf4ca --- /dev/null +++ b/.gitmodules @@ -0,0 +1,3 @@ +[submodule "LUFA"] + path = LUFA + url = https://github.com/abcminiuser/lufa.git diff --git a/Descriptors.c b/Descriptors.c new file mode 100644 index 0000000..2561e12 --- /dev/null +++ b/Descriptors.c @@ -0,0 +1,222 @@ +/* + 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 + * + * USB Device Descriptors, for library use when in USB device mode. Descriptors are special + * computer-readable structures which the host requests upon device enumeration, to determine + * the device's capabilities and functions. + */ + +#include "Descriptors.h" + + +/** Device descriptor structure. This descriptor, located in FLASH memory, describes the overall + * device characteristics, including the supported USB version, control endpoint size and the + * number of device configurations. The descriptor is read out by the USB host when the enumeration + * process begins. + */ +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 +}; + +/** Configuration descriptor structure. This descriptor, located in FLASH memory, describes the usage + * of the device in one of its supported configurations, including information about any device interfaces + * and endpoints. The descriptor is read out by the USB host during the enumeration process when selecting + * a configuration so that the host may correctly communicate with the USB device. + */ +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 + } +}; + +/** Language descriptor structure. This descriptor, located in FLASH memory, is returned when the host requests + * the string descriptor with index 0 (the first index). It is actually an array of 16-bit integers, which indicate + * via the language ID table available at USB.org what languages the device supports for its string descriptors. + */ +const USB_Descriptor_String_t PROGMEM LanguageString = USB_STRING_DESCRIPTOR_ARRAY(LANGUAGE_ID_ENG); + +/** Manufacturer descriptor string. This is a Unicode string containing the manufacturer's details in human readable + * form, and is read out upon request by the host when the appropriate string ID is requested, listed in the Device + * Descriptor. + */ +const USB_Descriptor_String_t PROGMEM ManufacturerString = USB_STRING_DESCRIPTOR(L"LUFA Library"); + +/** Product descriptor string. This is a Unicode string containing the product's details in human readable form, + * and is read out upon request by the host when the appropriate string ID is requested, listed in the Device + * Descriptor. + */ +const USB_Descriptor_String_t PROGMEM ProductString = USB_STRING_DESCRIPTOR(L"LUFA CDC Demo"); + +/** This function is called by the library when in device mode, and must be overridden (see library "USB Descriptors" + * documentation) by the application code so that the address and size of a requested descriptor can be given + * to the USB library. When the device receives a Get Descriptor request on the control endpoint, this function + * is called so that the descriptor details can be passed back and the appropriate descriptor sent back to the + * USB host. + */ +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; +} + diff --git a/Descriptors.h b/Descriptors.h new file mode 100644 index 0000000..25ae8a5 --- /dev/null +++ b/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 + + #include + + /* 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 + diff --git a/LUFA b/LUFA new file mode 160000 index 0000000..fa2cc3e --- /dev/null +++ b/LUFA @@ -0,0 +1 @@ +Subproject commit fa2cc3e1c3abab7c971506bd86ca4e28ecc7d288 diff --git a/LUFAConfig.h b/LUFAConfig.h new file mode 100644 index 0000000..0aa6746 --- /dev/null +++ b/LUFAConfig.h @@ -0,0 +1,86 @@ +/* + 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 + * \brief LUFA Library Configuration Header File + * + * This header file is used to configure LUFA's compile time options, + * as an alternative to the compile time constants supplied through + * a makefile. + * + * For information on what each token does, refer to the LUFA + * manual section "Summary of Compile Tokens". + */ + +#ifndef _LUFA_CONFIG_H_ +#define _LUFA_CONFIG_H_ + + /* Non-USB Related Configuration Tokens: */ +// #define DISABLE_TERMINAL_CODES + + /* USB Class Driver Related Tokens: */ +// #define HID_HOST_BOOT_PROTOCOL_ONLY +// #define HID_STATETABLE_STACK_DEPTH {Insert Value Here} +// #define HID_USAGE_STACK_DEPTH {Insert Value Here} +// #define HID_MAX_COLLECTIONS {Insert Value Here} +// #define HID_MAX_REPORTITEMS {Insert Value Here} +// #define HID_MAX_REPORT_IDS {Insert Value Here} +// #define NO_CLASS_DRIVER_AUTOFLUSH + + /* General USB Driver Related Tokens: */ +// #define ORDERED_EP_CONFIG + #define USE_STATIC_OPTIONS (USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL) + #define USB_DEVICE_ONLY +// #define USB_HOST_ONLY +// #define USB_STREAM_TIMEOUT_MS {Insert Value Here} +// #define NO_LIMITED_CONTROLLER_CONNECT +// #define NO_SOF_EVENTS + + /* USB Device Mode Driver Related Tokens: */ +// #define USE_RAM_DESCRIPTORS + #define USE_FLASH_DESCRIPTORS +// #define USE_EEPROM_DESCRIPTORS +// #define NO_INTERNAL_SERIAL + #define FIXED_CONTROL_ENDPOINT_SIZE 8 +// #define DEVICE_STATE_AS_GPIOR {Insert Value Here} + #define FIXED_NUM_CONFIGURATIONS 1 +// #define CONTROL_ONLY_DEVICE +// #define INTERRUPT_CONTROL_ENDPOINT +// #define NO_DEVICE_REMOTE_WAKEUP +// #define NO_DEVICE_SELF_POWER + + /* USB Host Mode Driver Related Tokens: */ +// #define HOST_STATE_AS_GPIOR {Insert Value Here} +// #define USB_HOST_TIMEOUT_MS {Insert Value Here} +// #define HOST_DEVICE_SETTLE_DELAY_MS {Insert Value Here} +// #define NO_AUTO_VBUS_MANAGEMENT +// #define INVERTED_VBUS_ENABLE_LINE + +#endif diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..248677c --- /dev/null +++ b/Makefile @@ -0,0 +1,38 @@ +# +# LUFA Library +# Copyright (C) Dean Camera, 2015. +# +# dean [at] fourwalledcubicle [dot] com +# www.lufa-lib.org +# +# -------------------------------------- +# LUFA Project Makefile. +# -------------------------------------- + +# Run "make help" for target help. + +MCU = atmega32u4 +ARCH = AVR8 +BOARD = USER +F_CPU = 16000000 +F_USB = $(F_CPU) +OPTIMIZATION = s +TARGET = usbfanctrl +SRC = main.c Descriptors.c $(LUFA_SRC_USB) $(LUFA_SRC_USBCLASS) $(LUFA_SRC_PLATFORM) +LUFA_PATH = LUFA/LUFA +CC_FLAGS = -DUSE_LUFA_CONFIG_HEADER -IConfig +LD_FLAGS = + +# Default target +all: + +# Include LUFA build script makefiles +include $(LUFA_PATH)/Build/lufa_core.mk +include $(LUFA_PATH)/Build/lufa_sources.mk +include $(LUFA_PATH)/Build/lufa_build.mk +#include $(LUFA_PATH)/Build/lufa_cppcheck.mk +#include $(LUFA_PATH)/Build/lufa_doxygen.mk +#include $(LUFA_PATH)/Build/lufa_dfu.mk +#include $(LUFA_PATH)/Build/lufa_hid.mk +include $(LUFA_PATH)/Build/lufa_avrdude.mk +#include $(LUFA_PATH)/Build/lufa_atprogram.mk diff --git a/main.c b/main.c new file mode 100644 index 0000000..8a2826b --- /dev/null +++ b/main.c @@ -0,0 +1,181 @@ +#include +#include +#include +#include +#include + +#include "Descriptors.h" + +#include +#include + +void SetupHardware(void); +void CDC_Task(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); + + +/** Contains the current baud rate and other settings of the virtual serial port. While this demo does not use + * the physical USART and thus does not use these settings, they must still be retained and returned to the host + * upon request or the host will assume the device is non-functional. + * + * These values are set by the host via a class-specific request, however they are not required to be used accurately. + * It is possible to completely ignore these value or use other settings as the host is completely unaware of the physical + * serial link characteristics and instead sends and receives data in endpoint streams. + */ +static CDC_LineEncoding_t LineEncoding = { .BaudRateBPS = 0, + .CharFormat = CDC_LINEENCODING_OneStopBit, + .ParityType = CDC_PARITY_None, + .DataBits = 8 }; + + +/** Main program entry point. This routine contains the overall program flow, including initial + * setup of all components and the main program loop. + */ +int main(void) +{ + SetupHardware(); + + GlobalInterruptEnable(); + + for (;;) + { + CDC_Task(); + 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); + + USB_Init(); +} + +/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs and + * starts the library USB task to begin the enumeration and USB management process. + */ +void EVENT_USB_Device_Connect(void) +{ +} + +/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via + * the status LEDs and stops the USB management and CDC management tasks. + */ +void EVENT_USB_Device_Disconnect(void) +{ +} + +/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration + * of the USB device after enumeration - the device endpoints are configured and the CDC management task started. + */ +void EVENT_USB_Device_ConfigurationChanged(void) +{ + /* Setup CDC Data Endpoints */ + Endpoint_ConfigureEndpoint(CDC_NOTIFICATION_EPADDR, EP_TYPE_INTERRUPT, CDC_NOTIFICATION_EPSIZE, 1); + Endpoint_ConfigureEndpoint(CDC_TX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1); + Endpoint_ConfigureEndpoint(CDC_RX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1); + + /* Reset line encoding baud rate so that the host knows to send new values */ + LineEncoding.BaudRateBPS = 0; +} + +/** Event handler for the USB_ControlRequest event. This is used to catch and process control requests sent to + * the device from the USB host before passing along unhandled control requests to the library for processing + * internally. + */ +void EVENT_USB_Device_ControlRequest(void) +{ + /* Process CDC specific control requests */ + switch (USB_ControlRequest.bRequest) + { + case CDC_REQ_GetLineEncoding: + if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE)) + { + Endpoint_ClearSETUP(); + + /* Write the line coding data to the control endpoint */ + Endpoint_Write_Control_Stream_LE(&LineEncoding, sizeof(CDC_LineEncoding_t)); + Endpoint_ClearOUT(); + } + break; + + case CDC_REQ_SetLineEncoding: + if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE)) + { + Endpoint_ClearSETUP(); + + /* Read the line coding data in from the host into the global struct */ + Endpoint_Read_Control_Stream_LE(&LineEncoding, sizeof(CDC_LineEncoding_t)); + Endpoint_ClearIN(); + } + break; + + case CDC_REQ_SetControlLineState: + if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE)) + { + Endpoint_ClearSETUP(); + Endpoint_ClearStatusStage(); + } + break; + } +} + +/** Function to manage CDC data transmission and reception to and from the host. */ +void CDC_Task(void) +{ + char* ReportString = NULL; + static bool ActionSent = false; + + /* Device must be connected and configured for the task to run */ + if (USB_DeviceState != DEVICE_STATE_Configured) + return; + + ActionSent = false; + + /* Flag management - Only allow one string to be sent per action */ + if ((ReportString != NULL) && (ActionSent == false) && LineEncoding.BaudRateBPS) + { + ActionSent = true; + + /* Select the Serial Tx Endpoint */ + Endpoint_SelectEndpoint(CDC_TX_EPADDR); + + /* Write the String to the Endpoint */ + Endpoint_Write_Stream_LE(ReportString, strlen(ReportString), NULL); + + /* Remember if the packet to send completely fills the endpoint */ + bool IsFull = (Endpoint_BytesInEndpoint() == CDC_TXRX_EPSIZE); + + /* Finalize the stream transfer to send the last packet */ + Endpoint_ClearIN(); + + /* If the last packet filled the endpoint, send an empty packet to release the buffer on + * the receiver (otherwise all data will be cached until a non-full packet is received) */ + if (IsFull) + { + /* Wait until the endpoint is ready for another packet */ + Endpoint_WaitUntilReady(); + + /* Send an empty packet to ensure that the host does not buffer data sent to it */ + Endpoint_ClearIN(); + } + } + + /* Select the Serial Rx Endpoint */ + Endpoint_SelectEndpoint(CDC_RX_EPADDR); + + /* Throw away any received data from the host */ + if (Endpoint_IsOUTReceived()) + Endpoint_ClearOUT(); +} +