diff options
Diffstat (limited to 'usb-serial')
-rw-r--r-- | usb-serial/Makefile | 90 | ||||
-rw-r--r-- | usb-serial/usb-serial.c | 562 |
2 files changed, 326 insertions, 326 deletions
diff --git a/usb-serial/Makefile b/usb-serial/Makefile index 26bae81..093a2c9 100644 --- a/usb-serial/Makefile +++ b/usb-serial/Makefile @@ -1,45 +1,45 @@ -##
-## spreadspace avr utils
-##
-##
-## Copyright (C) 2013-2014 Christian Pointner <equinox@spreadspace.org>
-##
-## This file is part of spreadspace avr utils.
-##
-## spreadspace avr utils is free software: you can redistribute it and/or modify
-## it under the terms of the GNU General Public License as published by
-## the Free Software Foundation, either version 3 of the License, or
-## any later version.
-##
-## spreadspace avr utils is distributed in the hope that it will be useful,
-## but WITHOUT ANY WARRANTY; without even the implied warranty of
-## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-## GNU General Public License for more details.
-##
-## You should have received a copy of the GNU General Public License
-## along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
-##
-
-NAME := usb-serial
-BOARD_TYPE := slowpandongle2
-OBJ := $(NAME).o
-LIBS := util led lufa-descriptor-usbserial
-EXTERNAL_LIBS := lufa
-SPREADAVR_PATH := ..
-
-LUFA_PATH := $(SPREADAVR_PATH)/contrib/LUFA-120219
-LUFA_OPTS = -D USB_DEVICE_ONLY
-LUFA_OPTS += -D DEVICE_STATE_AS_GPIOR=0
-LUFA_OPTS += -D ORDERED_EP_CONFIG
-LUFA_OPTS += -D FIXED_CONTROL_ENDPOINT_SIZE=8
-LUFA_OPTS += -D FIXED_NUM_CONFIGURATIONS=1
-LUFA_OPTS += -D USE_FLASH_DESCRIPTORS
-LUFA_OPTS += -D USE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)"
-LUFA_OPTS += -D INTERRUPT_CONTROL_ENDPOINT
-
-LUFA_OPTS += -D USB_MANUFACTURER="L\"equinox\"" -D USB_MANUFACTURER_LEN=7
-LUFA_OPTS += -D USB_PRODUCT="L\"spreadspace usb-serial example\"" -D USB_PRODUCT_LEN=30
-
-LUFA_COMPONENTS := USB USBCLASS SERIAL
-
-include $(SPREADAVR_PATH)/include.mk
+## +## spreadspace avr utils +## +## +## Copyright (C) 2013-2014 Christian Pointner <equinox@spreadspace.org> +## +## This file is part of spreadspace avr utils. +## +## spreadspace avr utils is free software: you can redistribute it and/or modify +## it under the terms of the GNU General Public License as published by +## the Free Software Foundation, either version 3 of the License, or +## any later version. +## +## spreadspace avr utils is distributed in the hope that it will be useful, +## but WITHOUT ANY WARRANTY; without even the implied warranty of +## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +## GNU General Public License for more details. +## +## You should have received a copy of the GNU General Public License +## along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>. +## + +NAME := usb-serial +BOARD_TYPE := slowpandongle2 +OBJ := $(NAME).o +LIBS := util led lufa-descriptor-usbserial +EXTERNAL_LIBS := lufa +SPREADAVR_PATH := .. + +LUFA_PATH := $(SPREADAVR_PATH)/contrib/LUFA-120219 +LUFA_OPTS = -D USB_DEVICE_ONLY +LUFA_OPTS += -D DEVICE_STATE_AS_GPIOR=0 +LUFA_OPTS += -D ORDERED_EP_CONFIG +LUFA_OPTS += -D FIXED_CONTROL_ENDPOINT_SIZE=8 +LUFA_OPTS += -D FIXED_NUM_CONFIGURATIONS=1 +LUFA_OPTS += -D USE_FLASH_DESCRIPTORS +LUFA_OPTS += -D USE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)" +LUFA_OPTS += -D INTERRUPT_CONTROL_ENDPOINT + +LUFA_OPTS += -D USB_MANUFACTURER="L\"equinox\"" -D USB_MANUFACTURER_LEN=7 +LUFA_OPTS += -D USB_PRODUCT="L\"spreadspace usb-serial example\"" -D USB_PRODUCT_LEN=30 + +LUFA_COMPONENTS := USB USBCLASS SERIAL + +include $(SPREADAVR_PATH)/include.mk diff --git a/usb-serial/usb-serial.c b/usb-serial/usb-serial.c index 9983d9d..f333675 100644 --- a/usb-serial/usb-serial.c +++ b/usb-serial/usb-serial.c @@ -1,281 +1,281 @@ -/*
- * spreadspace avr utils
- *
- *
- * Copyright (C) 2013-2014 Christian Pointner <equinox@spreadspace.org>
- *
- * This file is part of spreadspace avr utils.
- *
- * spreadspace avr utils is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * any later version.
- *
- * spreadspace avr utils is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
- */
-
-
-/* this is more or less the same as the LUFA example Project USBtoSerial and
- this is their LICENSE Header */
-
-/*
- LUFA Library
- Copyright (C) Dean Camera, 2012.
-
- dean [at] fourwalledcubicle [dot] com
- www.lufa-lib.org
-*/
-
-/*
- Copyright 2012 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 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.
-*/
-
-/** \file
- *
- * Main source file for the USBtoSerial project. This file contains the main tasks of
- * the project and is responsible for the initial application hardware configuration.
- */
-
-
-#include <avr/io.h>
-#include <avr/wdt.h>
-#include <avr/interrupt.h>
-#include <avr/power.h>
-
-#include "lufa-descriptor-usbserial.h"
-
-#include "util.h"
-#include "led.h"
-
-#include <LUFA/Version.h>
-#include <LUFA/Drivers/Peripheral/Serial.h>
-#include <LUFA/Drivers/Misc/RingBuffer.h>
-#include <LUFA/Drivers/USB/USB.h>
-
- /* Function Prototypes: */
-void SetupHardware(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);
-
-void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo);
-
-/** Circular buffer to hold data from the host before it is sent to the device via the serial port. */
-static RingBuffer_t USBtoUSART_Buffer;
-
-/** Underlying data buffer for \ref USBtoUSART_Buffer, where the stored bytes are located. */
-static uint8_t USBtoUSART_Buffer_Data[128];
-
-/** Circular buffer to hold data from the serial port before it is sent to the host. */
-static RingBuffer_t USARTtoUSB_Buffer;
-
-/** Underlying data buffer for \ref USARTtoUSB_Buffer, where the stored bytes are located. */
-static uint8_t USARTtoUSB_Buffer_Data[128];
-
-/** LUFA CDC Class driver interface configuration and state information. This structure is
- * passed to all CDC Class driver functions, so that multiple instances of the same class
- * within a device can be differentiated from one another.
- */
-USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
- {
- .Config =
- {
- .ControlInterfaceNumber = 0,
-
- .DataINEndpointNumber = CDC_TX_EPNUM,
- .DataINEndpointSize = CDC_TXRX_EPSIZE,
- .DataINEndpointDoubleBank = false,
-
- .DataOUTEndpointNumber = CDC_RX_EPNUM,
- .DataOUTEndpointSize = CDC_TXRX_EPSIZE,
- .DataOUTEndpointDoubleBank = false,
-
- .NotificationEndpointNumber = CDC_NOTIFICATION_EPNUM,
- .NotificationEndpointSize = CDC_NOTIFICATION_EPSIZE,
- .NotificationEndpointDoubleBank = false,
- },
- };
-
-
-/** 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();
-
- RingBuffer_InitBuffer(&USBtoUSART_Buffer, USBtoUSART_Buffer_Data, sizeof(USBtoUSART_Buffer_Data));
- RingBuffer_InitBuffer(&USARTtoUSB_Buffer, USARTtoUSB_Buffer_Data, sizeof(USARTtoUSB_Buffer_Data));
-
- sei();
-
- for (;;)
- {
- /* Only try to read in bytes from the CDC interface if the transmit buffer is not full */
- if (!(RingBuffer_IsFull(&USBtoUSART_Buffer)))
- {
- int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
-
- /* Read bytes from the USB OUT endpoint into the USART transmit buffer */
- if (!(ReceivedByte < 0))
- RingBuffer_Insert(&USBtoUSART_Buffer, ReceivedByte);
- }
-
- /* Check if the UART receive buffer flush timer has expired or the buffer is nearly full */
- uint16_t BufferCount = RingBuffer_GetCount(&USARTtoUSB_Buffer);
- if ((TIFR0 & (1 << TOV0)) || (BufferCount > (uint8_t)(sizeof(USARTtoUSB_Buffer_Data) * .75)))
- {
- /* Clear flush timer expiry flag */
- TIFR0 |= (1 << TOV0);
-
- /* Read bytes from the USART receive buffer into the USB IN endpoint */
- while (BufferCount--)
- {
- /* Try to send the next byte of data to the host, abort if there is an error without dequeuing */
- if (CDC_Device_SendByte(&VirtualSerial_CDC_Interface,
- RingBuffer_Peek(&USARTtoUSB_Buffer)) != ENDPOINT_READYWAIT_NoError)
- {
- break;
- }
-
- /* Dequeue the already sent byte from the buffer now we have confirmed that no transmission error occurred */
- RingBuffer_Remove(&USARTtoUSB_Buffer);
- }
- }
-
- /* Load the next byte from the USART transmit buffer into the USART */
- if (!(RingBuffer_IsEmpty(&USBtoUSART_Buffer)))
- Serial_SendByte(RingBuffer_Remove(&USBtoUSART_Buffer));
-
- 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();
-
- cpu_init();
- led_init();
- USB_Init();
-
- /* Start the flush timer so that overflows occur rapidly to push received bytes to the USB interface */
- TCCR0B = (1 << CS02);
-}
-
-/** Event handler for the library USB Connection event. */
-void EVENT_USB_Device_Connect(void)
-{
- led_on();
-}
-
-/** Event handler for the library USB Disconnection event. */
-void EVENT_USB_Device_Disconnect(void)
-{
- led_off();
-}
-
-/** Event handler for the library USB Configuration Changed event. */
-void EVENT_USB_Device_ConfigurationChanged(void)
-{
- CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface);
- led_toggle();
- _delay_ms(10);
- led_toggle();
-}
-
-/** Event handler for the library USB Control Request reception event. */
-void EVENT_USB_Device_ControlRequest(void)
-{
- CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);
-}
-
-/** ISR to manage the reception of data from the serial port, placing received bytes into a circular buffer
- * for later transmission to the host.
- */
-ISR(USART1_RX_vect, ISR_BLOCK)
-{
- uint8_t ReceivedByte = UDR1;
-
- if (USB_DeviceState == DEVICE_STATE_Configured)
- RingBuffer_Insert(&USARTtoUSB_Buffer, ReceivedByte);
-}
-
-/** Event handler for the CDC Class driver Line Encoding Changed event.
- *
- * \param[in] CDCInterfaceInfo Pointer to the CDC class interface configuration structure being referenced
- */
-void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo)
-{
- uint8_t ConfigMask = 0;
-
- switch (CDCInterfaceInfo->State.LineEncoding.ParityType)
- {
- case CDC_PARITY_Odd:
- ConfigMask = ((1 << UPM11) | (1 << UPM10));
- break;
- case CDC_PARITY_Even:
- ConfigMask = (1 << UPM11);
- break;
- }
-
- if (CDCInterfaceInfo->State.LineEncoding.CharFormat == CDC_LINEENCODING_TwoStopBits)
- ConfigMask |= (1 << USBS1);
-
- switch (CDCInterfaceInfo->State.LineEncoding.DataBits)
- {
- case 6:
- ConfigMask |= (1 << UCSZ10);
- break;
- case 7:
- ConfigMask |= (1 << UCSZ11);
- break;
- case 8:
- ConfigMask |= ((1 << UCSZ11) | (1 << UCSZ10));
- break;
- }
-
- /* Must turn off USART before reconfiguring it, otherwise incorrect operation may occur */
- UCSR1B = 0;
- UCSR1A = 0;
- UCSR1C = 0;
-
- /* Set the new baud rate before configuring the USART */
- UBRR1 = SERIAL_2X_UBBRVAL(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS);
-
- /* Reconfigure the USART in double speed mode for a wider baud rate range at the expense of accuracy */
- UCSR1C = ConfigMask;
- UCSR1A = (1 << U2X1);
- UCSR1B = ((1 << RXCIE1) | (1 << TXEN1) | (1 << RXEN1));
-}
-
+/* + * spreadspace avr utils + * + * + * Copyright (C) 2013-2014 Christian Pointner <equinox@spreadspace.org> + * + * This file is part of spreadspace avr utils. + * + * spreadspace avr utils is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * any later version. + * + * spreadspace avr utils is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>. + */ + + +/* this is more or less the same as the LUFA example Project USBtoSerial and + this is their LICENSE Header */ + +/* + LUFA Library + Copyright (C) Dean Camera, 2012. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2012 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 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. +*/ + +/** \file + * + * Main source file for the USBtoSerial project. This file contains the main tasks of + * the project and is responsible for the initial application hardware configuration. + */ + + +#include <avr/io.h> +#include <avr/wdt.h> +#include <avr/interrupt.h> +#include <avr/power.h> + +#include "lufa-descriptor-usbserial.h" + +#include "util.h" +#include "led.h" + +#include <LUFA/Version.h> +#include <LUFA/Drivers/Peripheral/Serial.h> +#include <LUFA/Drivers/Misc/RingBuffer.h> +#include <LUFA/Drivers/USB/USB.h> + + /* Function Prototypes: */ +void SetupHardware(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); + +void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo); + +/** Circular buffer to hold data from the host before it is sent to the device via the serial port. */ +static RingBuffer_t USBtoUSART_Buffer; + +/** Underlying data buffer for \ref USBtoUSART_Buffer, where the stored bytes are located. */ +static uint8_t USBtoUSART_Buffer_Data[128]; + +/** Circular buffer to hold data from the serial port before it is sent to the host. */ +static RingBuffer_t USARTtoUSB_Buffer; + +/** Underlying data buffer for \ref USARTtoUSB_Buffer, where the stored bytes are located. */ +static uint8_t USARTtoUSB_Buffer_Data[128]; + +/** LUFA CDC Class driver interface configuration and state information. This structure is + * passed to all CDC Class driver functions, so that multiple instances of the same class + * within a device can be differentiated from one another. + */ +USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface = + { + .Config = + { + .ControlInterfaceNumber = 0, + + .DataINEndpointNumber = CDC_TX_EPNUM, + .DataINEndpointSize = CDC_TXRX_EPSIZE, + .DataINEndpointDoubleBank = false, + + .DataOUTEndpointNumber = CDC_RX_EPNUM, + .DataOUTEndpointSize = CDC_TXRX_EPSIZE, + .DataOUTEndpointDoubleBank = false, + + .NotificationEndpointNumber = CDC_NOTIFICATION_EPNUM, + .NotificationEndpointSize = CDC_NOTIFICATION_EPSIZE, + .NotificationEndpointDoubleBank = false, + }, + }; + + +/** 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(); + + RingBuffer_InitBuffer(&USBtoUSART_Buffer, USBtoUSART_Buffer_Data, sizeof(USBtoUSART_Buffer_Data)); + RingBuffer_InitBuffer(&USARTtoUSB_Buffer, USARTtoUSB_Buffer_Data, sizeof(USARTtoUSB_Buffer_Data)); + + sei(); + + for (;;) + { + /* Only try to read in bytes from the CDC interface if the transmit buffer is not full */ + if (!(RingBuffer_IsFull(&USBtoUSART_Buffer))) + { + int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface); + + /* Read bytes from the USB OUT endpoint into the USART transmit buffer */ + if (!(ReceivedByte < 0)) + RingBuffer_Insert(&USBtoUSART_Buffer, ReceivedByte); + } + + /* Check if the UART receive buffer flush timer has expired or the buffer is nearly full */ + uint16_t BufferCount = RingBuffer_GetCount(&USARTtoUSB_Buffer); + if ((TIFR0 & (1 << TOV0)) || (BufferCount > (uint8_t)(sizeof(USARTtoUSB_Buffer_Data) * .75))) + { + /* Clear flush timer expiry flag */ + TIFR0 |= (1 << TOV0); + + /* Read bytes from the USART receive buffer into the USB IN endpoint */ + while (BufferCount--) + { + /* Try to send the next byte of data to the host, abort if there is an error without dequeuing */ + if (CDC_Device_SendByte(&VirtualSerial_CDC_Interface, + RingBuffer_Peek(&USARTtoUSB_Buffer)) != ENDPOINT_READYWAIT_NoError) + { + break; + } + + /* Dequeue the already sent byte from the buffer now we have confirmed that no transmission error occurred */ + RingBuffer_Remove(&USARTtoUSB_Buffer); + } + } + + /* Load the next byte from the USART transmit buffer into the USART */ + if (!(RingBuffer_IsEmpty(&USBtoUSART_Buffer))) + Serial_SendByte(RingBuffer_Remove(&USBtoUSART_Buffer)); + + 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(); + + cpu_init(); + led_init(); + USB_Init(); + + /* Start the flush timer so that overflows occur rapidly to push received bytes to the USB interface */ + TCCR0B = (1 << CS02); +} + +/** Event handler for the library USB Connection event. */ +void EVENT_USB_Device_Connect(void) +{ + led_on(); +} + +/** Event handler for the library USB Disconnection event. */ +void EVENT_USB_Device_Disconnect(void) +{ + led_off(); +} + +/** Event handler for the library USB Configuration Changed event. */ +void EVENT_USB_Device_ConfigurationChanged(void) +{ + CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface); + led_toggle(); + _delay_ms(10); + led_toggle(); +} + +/** Event handler for the library USB Control Request reception event. */ +void EVENT_USB_Device_ControlRequest(void) +{ + CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface); +} + +/** ISR to manage the reception of data from the serial port, placing received bytes into a circular buffer + * for later transmission to the host. + */ +ISR(USART1_RX_vect, ISR_BLOCK) +{ + uint8_t ReceivedByte = UDR1; + + if (USB_DeviceState == DEVICE_STATE_Configured) + RingBuffer_Insert(&USARTtoUSB_Buffer, ReceivedByte); +} + +/** Event handler for the CDC Class driver Line Encoding Changed event. + * + * \param[in] CDCInterfaceInfo Pointer to the CDC class interface configuration structure being referenced + */ +void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) +{ + uint8_t ConfigMask = 0; + + switch (CDCInterfaceInfo->State.LineEncoding.ParityType) + { + case CDC_PARITY_Odd: + ConfigMask = ((1 << UPM11) | (1 << UPM10)); + break; + case CDC_PARITY_Even: + ConfigMask = (1 << UPM11); + break; + } + + if (CDCInterfaceInfo->State.LineEncoding.CharFormat == CDC_LINEENCODING_TwoStopBits) + ConfigMask |= (1 << USBS1); + + switch (CDCInterfaceInfo->State.LineEncoding.DataBits) + { + case 6: + ConfigMask |= (1 << UCSZ10); + break; + case 7: + ConfigMask |= (1 << UCSZ11); + break; + case 8: + ConfigMask |= ((1 << UCSZ11) | (1 << UCSZ10)); + break; + } + + /* Must turn off USART before reconfiguring it, otherwise incorrect operation may occur */ + UCSR1B = 0; + UCSR1A = 0; + UCSR1C = 0; + + /* Set the new baud rate before configuring the USART */ + UBRR1 = SERIAL_2X_UBBRVAL(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS); + + /* Reconfigure the USART in double speed mode for a wider baud rate range at the expense of accuracy */ + UCSR1C = ConfigMask; + UCSR1A = (1 << U2X1); + UCSR1B = ((1 << RXCIE1) | (1 << TXEN1) | (1 << RXEN1)); +} + |