diff options
Diffstat (limited to 'Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c')
| -rw-r--r-- | Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c | 340 |
1 files changed, 0 insertions, 340 deletions
diff --git a/Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c b/Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c deleted file mode 100644 index 577d2ba67..000000000 --- a/Demos/Device/LowLevel/USBtoSerial/USBtoSerial.c +++ /dev/null @@ -1,340 +0,0 @@ -/*
- LUFA Library
- Copyright (C) Dean Camera, 2009.
-
- dean [at] fourwalledcubicle [dot] com
- www.fourwalledcubicle.com
-*/
-
-/*
- Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
-
- Permission to use, copy, modify, and distribute this software
- and its documentation for any purpose and without fee is hereby
- granted, 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 disclaim 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.
-*/
-
-#include "USBtoSerial.h"
-
-/** Contains the current baud rate and other settings of the virtual serial port.
- *
- * These values are set by the host via a class-specific request, and the physical USART should be reconfigured to match the
- * new settings each time they are changed by the host.
- */
-CDC_Line_Coding_t LineEncoding = { .BaudRateBPS = 0,
- .CharFormat = OneStopBit,
- .ParityType = Parity_None,
- .DataBits = 8 };
-
-/** Ring (circular) buffer to hold the RX data - data from the host to the attached device on the serial port. */
-RingBuff_t Rx_Buffer;
-
-/** Ring (circular) buffer to hold the TX data - data from the attached device on the serial port to the host. */
-RingBuff_t Tx_Buffer;
-
-/** Flag to indicate if the USART is currently transmitting data from the Rx_Buffer circular buffer. */
-volatile bool Transmitting = false;
-
-
-/** Main program entry point. This routine configures the hardware required by the application, then
- * enters a loop to run the application tasks in sequence.
- */
-int main(void)
-{
- SetupHardware();
-
- /* Ring buffer Initialization */
- Buffer_Initialize(&Rx_Buffer);
- Buffer_Initialize(&Tx_Buffer);
-
- LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
-
- 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);
-
- /* Hardware Initialization */
- Serial_Init(9600, false);
- LEDs_Init();
- 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)
-{
- /* Indicate USB enumerating */
- LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
-}
-
-/** 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)
-{
- /* Reset Tx and Rx buffers, device disconnected */
- Buffer_Initialize(&Rx_Buffer);
- Buffer_Initialize(&Tx_Buffer);
-
- /* Indicate USB not ready */
- LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
-}
-
-/** 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)
-{
- /* Indicate USB connected and ready */
- LEDs_SetAllLEDs(LEDMASK_USB_READY);
-
- /* Setup CDC Notification, Rx and Tx Endpoints */
- if (!(Endpoint_ConfigureEndpoint(CDC_NOTIFICATION_EPNUM, EP_TYPE_INTERRUPT,
- ENDPOINT_DIR_IN, CDC_NOTIFICATION_EPSIZE,
- ENDPOINT_BANK_SINGLE)))
- {
- LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
- }
-
- if (!(Endpoint_ConfigureEndpoint(CDC_TX_EPNUM, EP_TYPE_BULK,
- ENDPOINT_DIR_IN, CDC_TXRX_EPSIZE,
- ENDPOINT_BANK_SINGLE)))
- {
- LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
- }
-
- if (!(Endpoint_ConfigureEndpoint(CDC_RX_EPNUM, EP_TYPE_BULK,
- ENDPOINT_DIR_OUT, CDC_TXRX_EPSIZE,
- ENDPOINT_BANK_SINGLE)))
- {
- LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
- }
-
- /* Reset line encoding baud rate so that the host knows to send new values */
- LineEncoding.BaudRateBPS = 0;
-}
-
-/** Event handler for the USB_UnhandledControlRequest event. This is used to catch standard and class specific
- * control requests that are not handled internally by the USB library (including the CDC control commands,
- * which are all issued via the control endpoint), so that they can be handled appropriately for the application.
- */
-void EVENT_USB_Device_UnhandledControlRequest(void)
-{
- /* Process CDC specific control requests */
- switch (USB_ControlRequest.bRequest)
- {
- case REQ_GetLineEncoding:
- if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
- {
- /* Acknowledge the SETUP packet, ready for data transfer */
- Endpoint_ClearSETUP();
-
- /* Write the line coding data to the control endpoint */
- Endpoint_Write_Control_Stream_LE(&LineEncoding, sizeof(LineEncoding));
-
- /* Finalize the stream transfer to send the last packet or clear the host abort */
- Endpoint_ClearOUT();
- }
-
- break;
- case REQ_SetLineEncoding:
- if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
- {
- /* Acknowledge the SETUP packet, ready for data transfer */
- Endpoint_ClearSETUP();
-
- /* Read the line coding data in from the host into the global struct */
- Endpoint_Read_Control_Stream_LE(&LineEncoding, sizeof(LineEncoding));
-
- /* Finalize the stream transfer to clear the last packet from the host */
- Endpoint_ClearIN();
-
- /* Reconfigure the USART with the new settings */
- ReconfigureUSART();
- }
-
- break;
- case REQ_SetControlLineState:
- if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
- {
- /* Acknowledge the SETUP packet, ready for data transfer */
- Endpoint_ClearSETUP();
-
- /* NOTE: Here you can read in the line state mask from the host, to get the current state of the output handshake
- lines. The mask is read in from the wValue parameter in USB_ControlRequest, and can be masked against the
- CONTROL_LINE_OUT_* masks to determine the RTS and DTR line states using the following code:
- */
-
- Endpoint_ClearStatusStage();
- }
-
- break;
- }
-}
-
-/** Task to manage CDC data transmission and reception to and from the host, from and to the physical USART. */
-void CDC_Task(void)
-{
- /* Device must be connected and configured for the task to run */
- if (USB_DeviceState != DEVICE_STATE_Configured)
- return;
-
-#if 0
- /* NOTE: Here you can use the notification endpoint to send back line state changes to the host, for the special RS-232
- handshake signal lines (and some error states), via the CONTROL_LINE_IN_* masks and the following code:
- */
-
- USB_Notification_Header_t Notification = (USB_Notification_Header_t)
- {
- .NotificationType = (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE),
- .Notification = NOTIF_SerialState,
- .wValue = 0,
- .wIndex = 0,
- .wLength = sizeof(uint16_t),
- };
-
- uint16_t LineStateMask;
-
- // Set LineStateMask here to a mask of CONTROL_LINE_IN_* masks to set the input handshake line states to send to the host
-
- Endpoint_SelectEndpoint(CDC_NOTIFICATION_EPNUM);
- Endpoint_Write_Stream_LE(&Notification, sizeof(Notification));
- Endpoint_Write_Stream_LE(&LineStateMask, sizeof(LineStateMask));
- Endpoint_ClearIN();
-#endif
-
- /* Select the Serial Rx Endpoint */
- Endpoint_SelectEndpoint(CDC_RX_EPNUM);
-
- /* Check to see if a packet has been received from the host */
- if (Endpoint_IsOUTReceived())
- {
- /* Read the bytes in from the endpoint into the buffer while space is available */
- while (Endpoint_BytesInEndpoint() && (Rx_Buffer.Elements != BUFF_STATICSIZE))
- {
- /* Store each character from the endpoint */
- Buffer_StoreElement(&Rx_Buffer, Endpoint_Read_Byte());
- }
-
- /* Check to see if all bytes in the current packet have been read */
- if (!(Endpoint_BytesInEndpoint()))
- {
- /* Clear the endpoint buffer */
- Endpoint_ClearOUT();
- }
- }
-
- /* Check if Rx buffer contains data - if so, send it */
- if (Rx_Buffer.Elements)
- Serial_TxByte(Buffer_GetElement(&Rx_Buffer));
-
- /* Select the Serial Tx Endpoint */
- Endpoint_SelectEndpoint(CDC_TX_EPNUM);
-
- /* Check if the Tx buffer contains anything to be sent to the host */
- if ((Tx_Buffer.Elements) && LineEncoding.BaudRateBPS)
- {
- /* Wait until Serial Tx Endpoint Ready for Read/Write */
- Endpoint_WaitUntilReady();
-
- /* Write the bytes from the buffer to the endpoint while space is available */
- while (Tx_Buffer.Elements && Endpoint_IsReadWriteAllowed())
- {
- /* Write each byte retreived from the buffer to the endpoint */
- Endpoint_Write_Byte(Buffer_GetElement(&Tx_Buffer));
- }
-
- /* Remember if the packet to send completely fills the endpoint */
- bool IsFull = (Endpoint_BytesInEndpoint() == CDC_TXRX_EPSIZE);
-
- /* Send the data */
- Endpoint_ClearIN();
-
- /* If no more data to send and 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 && !(Tx_Buffer.Elements))
- {
- /* Wait until Serial Tx Endpoint Ready for Read/Write */
- Endpoint_WaitUntilReady();
-
- /* Send an empty packet to terminate the transfer */
- Endpoint_ClearIN();
- }
- }
-}
-
-/** ISR to handle the USART receive complete interrupt, fired each time the USART has received a character. This stores the received
- * character into the Tx_Buffer circular buffer for later transmission to the host.
- */
-ISR(USART1_RX_vect, ISR_BLOCK)
-{
- uint8_t ReceivedByte = UDR1;
-
- /* Only store received characters if the USB interface is connected */
- if ((USB_DeviceState == DEVICE_STATE_Configured) && LineEncoding.BaudRateBPS)
- Buffer_StoreElement(&Tx_Buffer, ReceivedByte);
-}
-
-/** Reconfigures the USART to match the current serial port settings issued by the host as closely as possible. */
-void ReconfigureUSART(void)
-{
- uint8_t ConfigMask = 0;
-
- /* Determine parity - non odd/even parity mode defaults to no parity */
- if (LineEncoding.ParityType == Parity_Odd)
- ConfigMask = ((1 << UPM11) | (1 << UPM10));
- else if (LineEncoding.ParityType == Parity_Even)
- ConfigMask = (1 << UPM11);
-
- /* Determine stop bits - 1.5 stop bits is set as 1 stop bit due to hardware limitations */
- if (LineEncoding.CharFormat == TwoStopBits)
- ConfigMask |= (1 << USBS1);
-
- /* Determine data size - 5, 6, 7, or 8 bits are supported */
- if (LineEncoding.DataBits == 6)
- ConfigMask |= (1 << UCSZ10);
- else if (LineEncoding.DataBits == 7)
- ConfigMask |= (1 << UCSZ11);
- else if (LineEncoding.DataBits == 8)
- ConfigMask |= ((1 << UCSZ11) | (1 << UCSZ10));
-
- /* Enable double speed, gives better error percentages at 8MHz */
- UCSR1A = (1 << U2X1);
-
- /* Enable transmit and receive modules and interrupts */
- UCSR1B = ((1 << RXCIE1) | (1 << TXEN1) | (1 << RXEN1));
-
- /* Set the USART mode to the mask generated by the Line Coding options */
- UCSR1C = ConfigMask;
-
- /* Set the USART baud rate register to the desired baud rate value */
- UBRR1 = SERIAL_2X_UBBRVAL((uint16_t)LineEncoding.BaudRateBPS);
-}
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