diff options
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); +} |