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Diffstat (limited to 'Projects/SerialToLCD/SerialToLCD.c')
| -rw-r--r-- | Projects/SerialToLCD/SerialToLCD.c | 170 | 
1 files changed, 170 insertions, 0 deletions
| diff --git a/Projects/SerialToLCD/SerialToLCD.c b/Projects/SerialToLCD/SerialToLCD.c new file mode 100644 index 0000000000..85abbdb50d --- /dev/null +++ b/Projects/SerialToLCD/SerialToLCD.c @@ -0,0 +1,170 @@ +/* +             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) +  Copyright 2012  Simon Foster (simon.foster [at] inbox [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 SerialToLCD program. This file contains the main tasks of + *  the project and is responsible for the initial application hardware configuration. + */ + +#include "SerialToLCD.h" + +/** Circular buffer to hold data from the host before it is sent to the LCD */ +static RingBuffer_t FromHost_Buffer; + +/** Underlying data buffer for \ref FromHost_Buffer, where the stored bytes are located. */ +static uint8_t      FromHost_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   = 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, +					}, +			}, +	}; + + +/** 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(&FromHost_Buffer, FromHost_Buffer_Data, sizeof(FromHost_Buffer_Data)); + +	GlobalInterruptEnable(); + +	for (;;) +	{ +		/* Only try to read in bytes from the CDC interface if the transmit buffer is not full */ +		if (!(RingBuffer_IsFull(&FromHost_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(&FromHost_Buffer, ReceivedByte); +		} + +		while (RingBuffer_GetCount(&FromHost_Buffer) > 0) +		{ +			static uint8_t EscapePending = 0; +			int16_t HD44780Byte = RingBuffer_Remove(&FromHost_Buffer); + +			if (HD44780Byte == COMMAND_ESCAPE) +			{ +				if (EscapePending) +				{ +					HD44780_WriteData(HD44780Byte); +					EscapePending = 0; +				} +				else +				{ +					/* Next received character is the command byte */ +					EscapePending = 1; +				} +			} +			else +			{ +				if (EscapePending) +				{ +					HD44780_WriteCommand(HD44780Byte); +					EscapePending = 0; +				} +				else +				{ +					HD44780_WriteData(HD44780Byte); +				} +			} +		} + +		CDC_Device_USBTask(&VirtualSerial_CDC_Interface); +		USB_USBTask(); +	} +} + +/** Configures the board hardware and chip peripherals for the application'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 + +	/* Hardware Initialization */ +	USB_Init(); + +	/* Power up the HD44780 Interface */ +	HD44780_Initialize(); +	HD44780_WriteCommand(CMD_DISPLAY_ON); + +	/* 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 Configuration Changed event. */ +void EVENT_USB_Device_ConfigurationChanged(void) +{ +	CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface); +} + +/** Event handler for the library USB Control Request reception event. */ +void EVENT_USB_Device_ControlRequest(void) +{ +	CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface); +} | 
