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Diffstat (limited to 'lib/lufa/Projects/Benito/Benito.c')
| -rw-r--r-- | lib/lufa/Projects/Benito/Benito.c | 311 |
1 files changed, 311 insertions, 0 deletions
diff --git a/lib/lufa/Projects/Benito/Benito.c b/lib/lufa/Projects/Benito/Benito.c new file mode 100644 index 000000000..93a39cb7b --- /dev/null +++ b/lib/lufa/Projects/Benito/Benito.c @@ -0,0 +1,311 @@ +/* + 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 Benito project. This file contains the main tasks of + * the project and is responsible for the initial application hardware configuration. + */ + +#include "Benito.h" + +/** 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]; + +/** Pulse generation counters to keep track of the number of milliseconds remaining for each pulse type */ +volatile struct +{ + uint8_t ResetPulse; /**< Milliseconds remaining for target /RESET pulse */ + uint8_t TxLEDPulse; /**< Milliseconds remaining for data Tx LED pulse */ + uint8_t RxLEDPulse; /**< Milliseconds remaining for data Rx LED pulse */ + uint8_t PingPongLEDPulse; /**< Milliseconds remaining for enumeration Tx/Rx ping-pong LED pulse */ +} PulseMSRemaining; + +/** Milliseconds remaining until the receive buffer is flushed to the USB host */ +uint8_t FlushPeriodRemaining = RECEIVE_BUFFER_FLUSH_MS; + +/** 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(&USARTtoUSB_Buffer, USARTtoUSB_Buffer_Data, sizeof(USARTtoUSB_Buffer_Data)); + + GlobalInterruptEnable(); + + for (;;) + { + /* Echo bytes from the host to the target via the hardware USART */ + if ((UCSR1A & (1 << UDRE1)) && CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface)) + { + UDR1 = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface); + + LEDs_TurnOnLEDs(LEDMASK_TX); + PulseMSRemaining.TxLEDPulse = TX_RX_LED_PULSE_MS; + } + + /* Check if the millisecond timer has elapsed */ + if (TIFR0 & (1 << OCF0A)) + { + /* Clear flush timer expiry flag */ + TIFR0 |= (1 << TOV0); + + /* Check if the reset pulse period has elapsed, if so tristate the target reset line */ + if (PulseMSRemaining.ResetPulse && !(--PulseMSRemaining.ResetPulse)) + { + LEDs_TurnOffLEDs(LEDMASK_BUSY); + AVR_RESET_LINE_DDR &= ~AVR_RESET_LINE_MASK; + } + + /* Check if the LEDs should be ping-ponging (during enumeration) */ + if (PulseMSRemaining.PingPongLEDPulse && !(--PulseMSRemaining.PingPongLEDPulse)) + { + LEDs_ToggleLEDs(LEDMASK_TX | LEDMASK_RX); + PulseMSRemaining.PingPongLEDPulse = PING_PONG_LED_PULSE_MS; + } + + /* Turn off TX LED(s) once the TX pulse period has elapsed */ + if (PulseMSRemaining.TxLEDPulse && !(--PulseMSRemaining.TxLEDPulse)) + LEDs_TurnOffLEDs(LEDMASK_TX); + + /* Turn off RX LED(s) once the RX pulse period has elapsed */ + if (PulseMSRemaining.RxLEDPulse && !(--PulseMSRemaining.RxLEDPulse)) + LEDs_TurnOffLEDs(LEDMASK_RX); + + /* Check if the receive buffer flush period has expired */ + uint16_t BufferCount = RingBuffer_GetCount(&USARTtoUSB_Buffer); + if (!(--FlushPeriodRemaining) || (BufferCount > 200)) + { + FlushPeriodRemaining = RECEIVE_BUFFER_FLUSH_MS; + + /* Start RX LED indicator pulse */ + if (BufferCount) + { + LEDs_TurnOnLEDs(LEDMASK_RX); + PulseMSRemaining.RxLEDPulse = TX_RX_LED_PULSE_MS; + } + + /* Echo bytes from the target to the host via the virtual serial port */ + 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); + } + } + } + + CDC_Device_USBTask(&VirtualSerial_CDC_Interface); + USB_USBTask(); + } +} + +/** 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 + + /* Hardware Initialization */ + LEDs_Init(); + USB_Init(); + + /* Millisecond Timer Interrupt */ + OCR0A = (F_CPU / 64 / 1000); + TCCR0A = (1 << WGM01); + TCCR0B = ((1 << CS01) | (1 << CS00)); + + /* Tristate target /RESET Line */ + AVR_RESET_LINE_PORT &= ~AVR_RESET_LINE_MASK; + AVR_RESET_LINE_DDR &= ~AVR_RESET_LINE_MASK; +} + +/** Event handler for the library USB Connection event. */ +void EVENT_USB_Device_Connect(void) +{ + PulseMSRemaining.PingPongLEDPulse = PING_PONG_LED_PULSE_MS; + LEDs_SetAllLEDs(LEDMASK_TX); +} + +/** Event handler for the library USB Disconnection event. */ +void EVENT_USB_Device_Disconnect(void) +{ + PulseMSRemaining.PingPongLEDPulse = 0; + LEDs_SetAllLEDs(LEDS_NO_LEDS); +} + +/** Event handler for the library USB Configuration Changed event. */ +void EVENT_USB_Device_ConfigurationChanged(void) +{ + bool ConfigSuccess = true; + + ConfigSuccess &= CDC_Device_ConfigureEndpoints(&VirtualSerial_CDC_Interface); + + PulseMSRemaining.PingPongLEDPulse = 0; + + LEDs_SetAllLEDs(ConfigSuccess ? LEDS_NO_LEDS : LEDMASK_ERROR); +} + +/** Event handler for the USB_ControlRequest event. This is used to catch and process control requests sent to + * the device from the USB host before passing along unhandled control requests to the library for processing + * internally. + */ +void EVENT_USB_Device_ControlRequest(void) +{ + CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface); +} + +/** 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)); +} + +/** 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 Host-to-Device Line Encoding Changed event. + * + * \param[in] CDCInterfaceInfo Pointer to the CDC class interface configuration structure being referenced + */ +void EVENT_CDC_Device_ControLineStateChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) +{ + static bool PreviousDTRState = false; + bool CurrentDTRState = (CDCInterfaceInfo->State.ControlLineStates.HostToDevice & CDC_CONTROL_LINE_OUT_DTR); + + /* Check if the DTR line has been asserted - if so, start the target AVR's reset pulse */ + if (!(PreviousDTRState) && CurrentDTRState) + { + LEDs_SetAllLEDs(LEDMASK_BUSY); + + AVR_RESET_LINE_DDR |= AVR_RESET_LINE_MASK; + PulseMSRemaining.ResetPulse = AVR_RESET_PULSE_MS; + } + + PreviousDTRState = CurrentDTRState; +} + |