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Diffstat (limited to 'lib/lufa/Projects/XPLAINBridge/XPLAINBridge.c')
| -rw-r--r-- | lib/lufa/Projects/XPLAINBridge/XPLAINBridge.c | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/lib/lufa/Projects/XPLAINBridge/XPLAINBridge.c b/lib/lufa/Projects/XPLAINBridge/XPLAINBridge.c new file mode 100644 index 0000000000..d901af819c --- /dev/null +++ b/lib/lufa/Projects/XPLAINBridge/XPLAINBridge.c @@ -0,0 +1,292 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2017. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2017 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 + * + * Main source file for the XPLAINBridge project. This file contains the main tasks of + * the project and is responsible for the initial application hardware configuration. + */ + +#include "XPLAINBridge.h" + +/** Current firmware mode, making the device behave as either a programmer or a USART bridge */ +bool CurrentFirmwareMode = MODE_USART_BRIDGE; + +/** 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 = 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, + }, + }, + }; + +/** Circular buffer to hold data from the host before it is sent to the device via the serial port. */ +RingBuffer_t USBtoUART_Buffer; + +/** Underlying data buffer for \ref USBtoUART_Buffer, where the stored bytes are located. */ +static uint8_t USBtoUART_Buffer_Data[128]; + +/** Circular buffer to hold data from the serial port before it is sent to the host. */ +RingBuffer_t UARTtoUSB_Buffer; + +/** Underlying data buffer for \ref UARTtoUSB_Buffer, where the stored bytes are located. */ +static uint8_t UARTtoUSB_Buffer_Data[128]; + + +/** 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(); + + LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY); + GlobalInterruptEnable(); + + for (;;) + { + if (CurrentFirmwareMode == MODE_USART_BRIDGE) + UARTBridge_Task(); + else + AVRISP_Task(); + + USB_USBTask(); + } +} + +void AVRISP_Task(void) +{ + /* Must be in the configured state for the AVRISP code to process data */ + if (USB_DeviceState != DEVICE_STATE_Configured) + return; + + V2Params_UpdateParamValues(); + + Endpoint_SelectEndpoint(AVRISP_DATA_OUT_EPADDR); + + /* Check to see if a V2 Protocol command has been received */ + if (Endpoint_IsOUTReceived()) + { + LEDs_SetAllLEDs(LEDMASK_BUSY); + + /* Pass off processing of the V2 Protocol command to the V2 Protocol handler */ + V2Protocol_ProcessCommand(); + + LEDs_SetAllLEDs(LEDMASK_USB_READY); + } +} + +void UARTBridge_Task(void) +{ + /* Must be in the configured state for the USART Bridge code to process data */ + if (USB_DeviceState != DEVICE_STATE_Configured) + return; + + /* Only try to read in bytes from the CDC interface if the transmit buffer is not full */ + if (!(RingBuffer_IsFull(&USBtoUART_Buffer))) + { + int16_t ReceivedByte = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface); + + /* Read bytes from the USB OUT endpoint into the UART transmit buffer */ + if (!(ReceivedByte < 0)) + RingBuffer_Insert(&USBtoUART_Buffer, ReceivedByte); + } + + /* Check if the UART receive buffer flush timer has expired or buffer is nearly full */ + uint16_t BufferCount = RingBuffer_GetCount(&UARTtoUSB_Buffer); + if ((TIFR0 & (1 << TOV0)) || (BufferCount > 200)) + { + /* 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(&UARTtoUSB_Buffer)) != ENDPOINT_READYWAIT_NoError) + { + break; + } + + /* Dequeue the already sent byte from the buffer now we have confirmed that no transmission error occurred */ + RingBuffer_Remove(&UARTtoUSB_Buffer); + } + } + + CDC_Device_USBTask(&VirtualSerial_CDC_Interface); +} + +/** Configures the board hardware and chip peripherals for the demo's functionality. */ +void SetupHardware(void) +{ +#if (ARCH == ARCH_AVR8) + /* Disable watchdog if enabled by bootloader/fuses */ + MCUSR &= ~(1 << WDRF); + wdt_disable(); + + /* Disable clock division */ + clock_prescale_set(clock_div_1); +#endif + + /* Disable JTAG debugging */ + MCUCR |= (1 << JTD); + MCUCR |= (1 << JTD); + + /* Enable pull-up on the JTAG TDI pin so we can use it to select the mode */ + PORTF |= (1 << 7); + Delay_MS(10); + + /* Select the firmware mode based on the JTD pin's value */ + CurrentFirmwareMode = (PINF & (1 << 7)) ? MODE_USART_BRIDGE : MODE_PDI_PROGRAMMER; + + /* Re-enable JTAG debugging */ + MCUCR &= ~(1 << JTD); + MCUCR &= ~(1 << JTD); + + /* Hardware Initialization */ + SoftUART_Init(); + LEDs_Init(); + #if defined(RESET_TOGGLES_LIBUSB_COMPAT) + UpdateCurrentCompatibilityMode(); + #endif + + /* USB Stack Initialization */ + USB_Init(); +} + +/** Event handler for the library USB Configuration Changed event. */ +void EVENT_USB_Device_ConfigurationChanged(void) +{ + bool ConfigSuccess = true; + + /* Configure the device endpoints according to the selected mode */ + if (CurrentFirmwareMode == MODE_USART_BRIDGE) + { + ConfigSuccess &= CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface); + + /* Configure the UART flush timer - run at Fcpu/1024 for maximum interval before overflow */ + TCCR0B = ((1 << CS02) | (1 << CS00)); + + /* Initialize ring buffers used to hold serial data between USB and software UART interfaces */ + RingBuffer_InitBuffer(&USBtoUART_Buffer, USBtoUART_Buffer_Data, sizeof(USBtoUART_Buffer_Data)); + RingBuffer_InitBuffer(&UARTtoUSB_Buffer, UARTtoUSB_Buffer_Data, sizeof(UARTtoUSB_Buffer_Data)); + + /* Start the software USART */ + SoftUART_Init(); + } + else + { + ConfigSuccess &= Endpoint_ConfigureEndpoint(AVRISP_DATA_OUT_EPADDR, EP_TYPE_BULK, AVRISP_DATA_EPSIZE, 1); + + if ((AVRISP_DATA_IN_EPADDR & ENDPOINT_EPNUM_MASK) != (AVRISP_DATA_OUT_EPADDR & ENDPOINT_EPNUM_MASK)) + ConfigSuccess &= Endpoint_ConfigureEndpoint(AVRISP_DATA_IN_EPADDR, EP_TYPE_BULK, AVRISP_DATA_EPSIZE, 1); + + /* Configure the V2 protocol packet handler */ + V2Protocol_Init(); + } + + LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR); +} + +/** Event handler for the library USB Control Request reception event. */ +void EVENT_USB_Device_ControlRequest(void) +{ + if (CurrentFirmwareMode == MODE_USART_BRIDGE) + CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface); +} + +/** Event handler for the library USB Connection event. */ +void EVENT_USB_Device_Connect(void) +{ + LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING); +} + +/** Event handler for the library USB Disconnection event. */ +void EVENT_USB_Device_Disconnect(void) +{ + LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY); +} + +/** 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) +{ + /* Change the software UART's baud rate to match the new baud rate */ + SoftUART_SetBaud(CDCInterfaceInfo->State.LineEncoding.BaudRateBPS); +} + +/** 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. + * + * \param[in] wValue Descriptor type and index to retrieve + * \param[in] wIndex Sub-index to retrieve (such as a localized string language) + * \param[out] DescriptorAddress Address of the retrieved descriptor + * + * \return Length of the retrieved descriptor in bytes, or NO_DESCRIPTOR if the descriptor was not found + */ +uint16_t CALLBACK_USB_GetDescriptor(const uint16_t wValue, + const uint16_t wIndex, + const void** const DescriptorAddress) +{ + /* Return the correct descriptors based on the selected mode */ + if (CurrentFirmwareMode == MODE_USART_BRIDGE) + return USART_GetDescriptor(wValue, wIndex, DescriptorAddress); + else + return AVRISP_GetDescriptor(wValue, wIndex, DescriptorAddress); +} + |