uf2uno.c

/*
             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 uf2uno demo. This file contains the main tasks of
 *  the demo and is responsible for the initial application hardware configuration.
 */

#include "uf2uno.h"

/** LUFA Mass Storage Class driver interface configuration and state information. This structure is
 *  passed to all Mass Storage Class driver functions, so that multiple instances of the same class
 *  within a device can be differentiated from one another.
 */
USB_ClassInfo_MS_Device_t Disk_MS_Interface =
	{
		.Config =
			{
				.InterfaceNumber                = INTERFACE_ID_MassStorage,
				.DataINEndpoint                 =
					{
						.Address                = MASS_STORAGE_IN_EPADDR,
						.Size                   = MASS_STORAGE_IO_EPSIZE,
						.Banks                  = 1,
					},
				.DataOUTEndpoint                =
					{
						.Address                = MASS_STORAGE_OUT_EPADDR,
						.Size                   = MASS_STORAGE_IO_EPSIZE,
						.Banks                  = 1,
					},
				.TotalLUNs                      = TOTAL_LUNS,
			},
	};

/** Circular buffer to hold data from the host before it is sent to the device via the serial port. */
RingBuff_t USBtoUSART_Buffer;

/** Circular buffer to hold data from the serial port before it is sent to the host. */
RingBuff_t USARTtoUSB_Buffer;

uint8_t needsFlush;

/** Pulse generation counters to keep track of the number of milliseconds remaining for each pulse type */
volatile struct
{
	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;

void logChar(char c) {
	// RingBuffer_Insert(&USARTtoUSB_Buffer, c);
}

/** 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);
	RingBuffer_InitBuffer(&USARTtoUSB_Buffer);

	LEDs_SetAllLEDs(LEDMASK_ERROR);
	GlobalInterruptEnable();

	for (;;)
	{
		/* Check if the UART receive buffer flush timer has expired or the buffer is nearly full */
		RingBuff_Count_t BufferCount = RingBuffer_GetCount(&USARTtoUSB_Buffer);
		if ((TIFR0 & (1 << TOV0)) || (BufferCount > BUFFER_NEARLY_FULL))
		{
			TIFR0 |= (1 << TOV0);

			if (BufferCount) {
				//LEDs_TurnOnLEDs(LEDMASK_TX);
				//PulseMSRemaining.TxLEDPulse = TX_RX_LED_PULSE_MS;
			}

			if (BufferCount > 0)
				needsFlush = 1;

			/* 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);
		}
		
		/* Load the next byte from the USART transmit buffer into the USART */
		if (!(RingBuffer_IsEmpty(&USBtoUSART_Buffer))) {
		    Serial_SendByte(RingBuffer_Remove(&USBtoUSART_Buffer));
		  	
		  	//LEDs_TurnOnLEDs(LEDMASK_RX);
			//PulseMSRemaining.RxLEDPulse = TX_RX_LED_PULSE_MS;
		}
	
		MS_Device_USBTask(&Disk_MS_Interface);
		HID_Task();
		USB_USBTask();
	}
}

void configSerial(void) {
	/* Must turn off USART before reconfiguring it, otherwise incorrect operation may occur */
	UCSR1B = 0;
	UCSR1A = 0;
	UCSR1C = 0;

	UBRR1  = SERIAL_2X_UBBRVAL(115200);	

	UCSR1C = (1 << UCSZ11) | (1 << UCSZ10);
	UCSR1A = (1 << U2X1);
	UCSR1B = ((1 << RXCIE1) | (1 << TXEN1) | (1 << RXEN1));
}

/** 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);
#elif (ARCH == ARCH_XMEGA)
	/* Start the PLL to multiply the 2MHz RC oscillator to 32MHz and switch the CPU core to run from it */
	XMEGACLK_StartPLL(CLOCK_SRC_INT_RC2MHZ, 2000000, F_CPU);
	XMEGACLK_SetCPUClockSource(CLOCK_SRC_PLL);

	/* Start the 32MHz internal RC oscillator and start the DFLL to increase it to 48MHz using the USB SOF as a reference */
	XMEGACLK_StartInternalOscillator(CLOCK_SRC_INT_RC32MHZ);
	XMEGACLK_StartDFLL(CLOCK_SRC_INT_RC32MHZ, DFLL_REF_INT_USBSOF, F_USB);

	PMIC.CTRL = PMIC_LOLVLEN_bm | PMIC_MEDLVLEN_bm | PMIC_HILVLEN_bm;
#endif

	Serial_Init(115200, true);
	configSerial(); // includes RXCIE1 bit

	/* Hardware Initialization */
	LEDs_Init();
	USB_Init();

	/* Start the flush timer so that overflows occur rapidly to push received bytes to the USB interface */
	TCCR0B = (1 << CS02);
	
	/* Pull target /RESET line high */
	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)
{
	LEDs_SetAllLEDs(LEDMASK_ENUMERATING);
}

/** Event handler for the library USB Disconnection event. */
void EVENT_USB_Device_Disconnect(void)
{
	LEDs_SetAllLEDs(LEDMASK_NOTREADY);
}

/** Event handler for the library USB Configuration Changed event. */
void EVENT_USB_Device_ConfigurationChanged(void)
{
	bool ConfigSuccess = true;

	ConfigSuccess &= MS_Device_ConfigureEndpoints(&Disk_MS_Interface);

	ConfigSuccess &= Endpoint_ConfigureEndpoint(HID_IN_EPADDR, EP_TYPE_INTERRUPT, HID_IO_EPSIZE, 1);
	ConfigSuccess &= Endpoint_ConfigureEndpoint(HID_OUT_EPADDR, EP_TYPE_INTERRUPT, HID_IO_EPSIZE, 1);
	LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_READY : LEDMASK_ERROR);
}

/** Event handler for the library USB Control Request reception event. */
void EVENT_USB_Device_ControlRequest(void)
{
	MS_Device_ProcessControlRequest(&Disk_MS_Interface);

	/* Handle HID Class specific requests */
	switch (USB_ControlRequest.bRequest)
	{
		case HID_REQ_GetReport:
			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				uint8_t GenericData[8];

				Endpoint_ClearSETUP();
				memset(GenericData, 0, sizeof(GenericData));

				/* Write the report data to the control endpoint */
				Endpoint_Write_Control_Stream_LE(&GenericData, sizeof(GenericData));
				Endpoint_ClearOUT();
			}

			break;
		case HID_REQ_SetReport:
			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();
				Endpoint_ClearIN();
			}

			break;
	}

}

/** Mass Storage class driver callback function the reception of SCSI commands from the host, which must be processed.
 *
 *  \param[in] MSInterfaceInfo  Pointer to the Mass Storage class interface configuration structure being referenced
 */
bool CALLBACK_MS_Device_SCSICommandReceived(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
	bool CommandSuccess;

	LEDs_TurnOnLEDs(LEDMASK_MSD);
	CommandSuccess = SCSI_DecodeSCSICommand(MSInterfaceInfo);
	LEDs_TurnOffLEDs(LEDMASK_MSD);

	return CommandSuccess;
}


volatile uint8_t recv_STK_OK = 0;

/** 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 (ReceivedByte == 0x10)
		recv_STK_OK++;

	if (USB_DeviceState == DEVICE_STATE_Configured) {
 		RingBuffer_Insert(&USARTtoUSB_Buffer, ReceivedByte);
	}
}