+++ /dev/null
-/*\r
- LUFA Library\r
- Copyright (C) Dean Camera, 2009.\r
- \r
- dean [at] fourwalledcubicle [dot] com\r
- www.fourwalledcubicle.com\r
-*/\r
-\r
-/*\r
- Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
-\r
- Permission to use, copy, modify, and distribute this software\r
- and its documentation for any purpose and without fee is hereby\r
- granted, provided that the above copyright notice appear in all\r
- copies and that both that the copyright notice and this\r
- permission notice and warranty disclaimer appear in supporting\r
- documentation, and that the name of the author not be used in\r
- advertising or publicity pertaining to distribution of the\r
- software without specific, written prior permission.\r
-\r
- The author disclaim all warranties with regard to this\r
- software, including all implied warranties of merchantability\r
- and fitness. In no event shall the author be liable for any\r
- special, indirect or consequential damages or any damages\r
- whatsoever resulting from loss of use, data or profits, whether\r
- in an action of contract, negligence or other tortious action,\r
- arising out of or in connection with the use or performance of\r
- this software.\r
-*/\r
-\r
-#include "USBtoSerial.h"\r
-\r
-/* Project Tags, for reading out using the ButtLoad project */\r
-BUTTLOADTAG(ProjName, "LUFA USB RS232 App");\r
-BUTTLOADTAG(BuildTime, __TIME__);\r
-BUTTLOADTAG(BuildDate, __DATE__);\r
-BUTTLOADTAG(LUFAVersion, "LUFA V" LUFA_VERSION_STRING);\r
-\r
-/* Scheduler Task List */\r
-TASK_LIST\r
-{\r
- { Task: USB_USBTask , TaskStatus: TASK_STOP },\r
- { Task: CDC_Task , TaskStatus: TASK_STOP },\r
-};\r
-\r
-/* Globals: */\r
-/** Contains the current baud rate and other settings of the virtual serial port.\r
- *\r
- * These values are set by the host via a class-specific request, and the physical USART should be reconfigured to match the\r
- * new settings each time they are changed by the host.\r
- */\r
-CDC_Line_Coding_t LineCoding = { BaudRateBPS: 9600,\r
- CharFormat: OneStopBit,\r
- ParityType: Parity_None,\r
- DataBits: 8 };\r
-\r
-/** Ring (circular) buffer to hold the RX data - data from the host to the attached device on the serial port. */\r
-RingBuff_t Rx_Buffer;\r
-\r
-/** Ring (circular) buffer to hold the TX data - data from the attached device on the serial port to the host. */\r
-RingBuff_t Tx_Buffer;\r
-\r
-/** Flag to indicate if the USART is currently transmitting data from the Rx_Buffer circular buffer. */\r
-volatile bool Transmitting = false;\r
-\r
-/** Main program entry point. This routine configures the hardware required by the application, then\r
- * starts the scheduler to run the application tasks.\r
- */\r
-int main(void)\r
-{\r
- /* Disable watchdog if enabled by bootloader/fuses */\r
- MCUSR &= ~(1 << WDRF);\r
- wdt_disable();\r
-\r
- /* Disable clock division */\r
- clock_prescale_set(clock_div_1);\r
-\r
- /* Hardware Initialization */\r
- LEDs_Init();\r
- ReconfigureUSART();\r
- \r
- /* Ringbuffer Initialization */\r
- Buffer_Initialize(&Rx_Buffer);\r
- Buffer_Initialize(&Tx_Buffer);\r
- \r
- /* Indicate USB not ready */\r
- UpdateStatus(Status_USBNotReady);\r
- \r
- /* Initialize Scheduler so that it can be used */\r
- Scheduler_Init();\r
-\r
- /* Initialize USB Subsystem */\r
- USB_Init();\r
-\r
- /* Scheduling - routine never returns, so put this last in the main function */\r
- Scheduler_Start();\r
-}\r
-\r
-/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs and\r
- * starts the library USB task to begin the enumeration and USB management process.\r
- */\r
-EVENT_HANDLER(USB_Connect)\r
-{\r
- /* Start USB management task */\r
- Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);\r
-\r
- /* Indicate USB enumerating */\r
- UpdateStatus(Status_USBEnumerating);\r
-}\r
-\r
-/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via\r
- * the status LEDs and stops the USB management and CDC management tasks.\r
- */\r
-EVENT_HANDLER(USB_Disconnect)\r
-{\r
- /* Stop running CDC and USB management tasks */\r
- Scheduler_SetTaskMode(CDC_Task, TASK_STOP);\r
- Scheduler_SetTaskMode(USB_USBTask, TASK_STOP);\r
- \r
- /* Reset Tx and Rx buffers, device disconnected */\r
- Buffer_Initialize(&Rx_Buffer);\r
- Buffer_Initialize(&Tx_Buffer);\r
-\r
- /* Indicate USB not ready */\r
- UpdateStatus(Status_USBNotReady);\r
-}\r
-\r
-/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration\r
- * of the USB device after enumeration - the device endpoints are configured and the CDC management task started.\r
- */\r
-EVENT_HANDLER(USB_ConfigurationChanged)\r
-{\r
- /* Setup CDC Notification, Rx and Tx Endpoints */\r
- Endpoint_ConfigureEndpoint(CDC_NOTIFICATION_EPNUM, EP_TYPE_INTERRUPT,\r
- ENDPOINT_DIR_IN, CDC_NOTIFICATION_EPSIZE,\r
- ENDPOINT_BANK_SINGLE);\r
-\r
- Endpoint_ConfigureEndpoint(CDC_TX_EPNUM, EP_TYPE_BULK,\r
- ENDPOINT_DIR_IN, CDC_TXRX_EPSIZE,\r
- ENDPOINT_BANK_SINGLE);\r
-\r
- Endpoint_ConfigureEndpoint(CDC_RX_EPNUM, EP_TYPE_BULK,\r
- ENDPOINT_DIR_OUT, CDC_TXRX_EPSIZE,\r
- ENDPOINT_BANK_SINGLE);\r
-\r
- /* Indicate USB connected and ready */\r
- UpdateStatus(Status_USBReady);\r
-\r
- /* Start CDC task */\r
- Scheduler_SetTaskMode(CDC_Task, TASK_RUN);\r
-}\r
-\r
-/** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific\r
- * control requests that are not handled internally by the USB library (including the CDC control commands,\r
- * which are all issued via the control endpoint), so that they can be handled appropriately for the application.\r
- */\r
-EVENT_HANDLER(USB_UnhandledControlPacket)\r
-{\r
- uint8_t* LineCodingData = (uint8_t*)&LineCoding;\r
-\r
- /* Process CDC specific control requests */\r
- switch (bRequest)\r
- {\r
- case REQ_GetLineEncoding:\r
- if (bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))\r
- { \r
- /* Acknowledge the SETUP packet, ready for data transfer */\r
- Endpoint_ClearSetupReceived();\r
-\r
- /* Write the line coding data to the control endpoint */\r
- Endpoint_Write_Control_Stream_LE(LineCodingData, sizeof(LineCoding));\r
- \r
- /* Finalize the stream transfer to send the last packet or clear the host abort */\r
- Endpoint_ClearSetupOUT();\r
- }\r
- \r
- break;\r
- case REQ_SetLineEncoding:\r
- if (bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))\r
- {\r
- /* Acknowledge the SETUP packet, ready for data transfer */\r
- Endpoint_ClearSetupReceived();\r
-\r
- /* Read the line coding data in from the host into the global struct */\r
- Endpoint_Read_Control_Stream_LE(LineCodingData, sizeof(LineCoding));\r
-\r
- /* Finalize the stream transfer to clear the last packet from the host */\r
- Endpoint_ClearSetupIN();\r
- \r
- /* Reconfigure the USART with the new settings */\r
- ReconfigureUSART();\r
- }\r
- \r
- break;\r
- case REQ_SetControlLineState:\r
- if (bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))\r
- {\r
-#if 0\r
- /* NOTE: Here you can read in the line state mask from the host, to get the current state of the output handshake\r
- lines. The mask is read in from the wValue parameter, and can be masked against the CONTROL_LINE_OUT_* masks\r
- to determine the RTS and DTR line states using the following code:\r
- */\r
-\r
- uint16_t wIndex = Endpoint_Read_Word_LE();\r
- \r
- // Do something with the given line states in wIndex\r
-#endif\r
- \r
- /* Acknowledge the SETUP packet, ready for data transfer */\r
- Endpoint_ClearSetupReceived();\r
- \r
- /* Acknowledge status stage */\r
- while (!(Endpoint_IsSetupINReady()));\r
- Endpoint_ClearSetupIN();\r
- }\r
- \r
- break;\r
- }\r
-}\r
-\r
-/** Task to manage CDC data transmission and reception to and from the host, from and to the physical USART. */\r
-TASK(CDC_Task)\r
-{\r
- if (USB_IsConnected)\r
- {\r
-#if 0\r
- /* NOTE: Here you can use the notification endpoint to send back line state changes to the host, for the special RS-232\r
- handshake signal lines (and some error states), via the CONTROL_LINE_IN_* masks and the following code:\r
- */\r
-\r
- USB_Notification_Header_t Notification = (USB_Notification_Header_t)\r
- {\r
- NotificationType: (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE),\r
- Notification: NOTIF_SerialState,\r
- wValue: 0,\r
- wIndex: 0,\r
- wLength: sizeof(uint16_t),\r
- };\r
- \r
- uint16_t LineStateMask;\r
- \r
- // Set LineStateMask here to a mask of CONTROL_LINE_IN_* masks to set the input handshake line states to send to the host\r
- \r
- Endpoint_SelectEndpoint(CDC_NOTIFICATION_EPNUM);\r
- Endpoint_Write_Stream_LE(&Notification, sizeof(Notification));\r
- Endpoint_Write_Stream_LE(&LineStateMask, sizeof(LineStateMask));\r
- Endpoint_ClearCurrentBank();\r
-#endif\r
-\r
- /* Select the Serial Rx Endpoint */\r
- Endpoint_SelectEndpoint(CDC_RX_EPNUM);\r
- \r
- if (Endpoint_ReadWriteAllowed())\r
- {\r
- /* Read the received data endpoint into the transmission buffer */\r
- while (Endpoint_BytesInEndpoint())\r
- {\r
- /* Wait until the buffer has space for a new character */\r
- while (!((BUFF_STATICSIZE - Rx_Buffer.Elements)));\r
- \r
- /* Store each character from the endpoint */\r
- Buffer_StoreElement(&Rx_Buffer, Endpoint_Read_Byte());\r
- }\r
- \r
- /* Clear the endpoint buffer */\r
- Endpoint_ClearCurrentBank();\r
- }\r
- \r
- /* Check if Rx buffer contains data */\r
- if (Rx_Buffer.Elements)\r
- {\r
- /* Initiate the transmission of the buffer contents if USART idle */\r
- if (!(Transmitting))\r
- {\r
- Transmitting = true;\r
- Serial_TxByte(Buffer_GetElement(&Rx_Buffer));\r
- }\r
- }\r
-\r
- /* Select the Serial Tx Endpoint */\r
- Endpoint_SelectEndpoint(CDC_TX_EPNUM);\r
-\r
- /* Check if the Tx buffer contains anything to be sent to the host */\r
- if (Tx_Buffer.Elements)\r
- {\r
- /* Wait until Serial Tx Endpoint Ready for Read/Write */\r
- while (!(Endpoint_ReadWriteAllowed()));\r
- \r
- /* Check before sending the data if the endpoint is completely full */\r
- bool IsFull = (Endpoint_BytesInEndpoint() == CDC_TXRX_EPSIZE);\r
- \r
- /* Write the transmission buffer contents to the received data endpoint */\r
- while (Tx_Buffer.Elements && (Endpoint_BytesInEndpoint() < CDC_TXRX_EPSIZE))\r
- Endpoint_Write_Byte(Buffer_GetElement(&Tx_Buffer));\r
- \r
- /* Send the data */\r
- Endpoint_ClearCurrentBank();\r
-\r
- /* If a full endpoint was sent, we need to send an empty packet afterwards to terminate the transfer */\r
- if (IsFull)\r
- {\r
- /* Wait until Serial Tx Endpoint Ready for Read/Write */\r
- while (!(Endpoint_ReadWriteAllowed()));\r
-\r
- /* Send an empty packet to terminate the transfer */\r
- Endpoint_ClearCurrentBank();\r
- }\r
- }\r
- }\r
-}\r
-\r
-/** ISR to handle the USART transmit complete interrupt, fired each time the USART has sent a character. This reloads the USART\r
- * data register with the next byte from the Rx_Buffer circular buffer if a character is available, or stops the transmission if\r
- * the buffer is currently empty.\r
- */\r
-ISR(USART1_TX_vect, ISR_BLOCK)\r
-{\r
- /* Send next character if available */\r
- if (Rx_Buffer.Elements)\r
- UDR1 = Buffer_GetElement(&Rx_Buffer);\r
- else\r
- Transmitting = false;\r
-}\r
-\r
-/** ISR to handle the USART receive complete interrupt, fired each time the USART has received a character. This stores the received\r
- * character into the Tx_Buffer circular buffer for later transmission to the host.\r
- */\r
-ISR(USART1_RX_vect, ISR_BLOCK)\r
-{\r
- /* Only store received characters if the USB interface is connected */\r
- if (USB_IsConnected)\r
- {\r
- /* Character received, store it into the buffer */\r
- Buffer_StoreElement(&Tx_Buffer, UDR1);\r
- }\r
-}\r
-\r
-/** Function to manage status updates to the user. This is done via LEDs on the given board, if available, but may be changed to\r
- * log to a serial port, or anything else that is suitable for status updates.\r
- *\r
- * \param CurrentStatus Current status of the system, from the USBtoSerial_StatusCodes_t enum\r
- */\r
-void UpdateStatus(uint8_t CurrentStatus)\r
-{\r
- uint8_t LEDMask = LEDS_NO_LEDS;\r
- \r
- /* Set the LED mask to the appropriate LED mask based on the given status code */\r
- switch (CurrentStatus)\r
- {\r
- case Status_USBNotReady:\r
- LEDMask = (LEDS_LED1);\r
- break;\r
- case Status_USBEnumerating:\r
- LEDMask = (LEDS_LED1 | LEDS_LED2);\r
- break;\r
- case Status_USBReady:\r
- LEDMask = (LEDS_LED2 | LEDS_LED4);\r
- break;\r
- }\r
- \r
- /* Set the board LEDs to the new LED mask */\r
- LEDs_SetAllLEDs(LEDMask);\r
-}\r
-\r
-/** Reconfigures the USART to match the current serial port settings issued by the host as closely as possible. */\r
-void ReconfigureUSART(void)\r
-{\r
- uint8_t ConfigMask = 0;\r
-\r
- /* Determine parity - non odd/even parity mode defaults to no parity */\r
- if (LineCoding.ParityType == Parity_Odd)\r
- ConfigMask = ((1 << UPM11) | (1 << UPM10));\r
- else if (LineCoding.ParityType == Parity_Even)\r
- ConfigMask = (1 << UPM11);\r
-\r
- /* Determine stop bits - 1.5 stop bits is set as 1 stop bit due to hardware limitations */\r
- if (LineCoding.CharFormat == TwoStopBits)\r
- ConfigMask |= (1 << USBS1);\r
-\r
- /* Determine data size - 5, 6, 7, or 8 bits are supported */\r
- if (LineCoding.DataBits == 6)\r
- ConfigMask |= (1 << UCSZ10);\r
- else if (LineCoding.DataBits == 7)\r
- ConfigMask |= (1 << UCSZ11);\r
- else if (LineCoding.DataBits == 8)\r
- ConfigMask |= ((1 << UCSZ11) | (1 << UCSZ10));\r
- \r
- /* Enable double speed, gives better error percentages at 8MHz */\r
- UCSR1A = (1 << U2X1);\r
- \r
- /* Enable transmit and receive modules and interrupts */\r
- UCSR1B = ((1 << TXCIE1) | (1 << RXCIE1) | (1 << TXEN1) | (1 << RXEN1));\r
-\r
- /* Set the USART mode to the mask generated by the Line Coding options */\r
- UCSR1C = ConfigMask;\r
- \r
- /* Set the USART baud rate register to the desired baud rate value */\r
- UBRR1 = SERIAL_2X_UBBRVAL((uint16_t)LineCoding.BaudRateBPS);\r
-}\r
projects / pub / lufa.git / blobdiff