started usb spi project as copy of usb-serial

git-svn-id: https://svn.spreadspace.org/avr/trunk@42 aa12f405-d877-488e-9caf-2d797e2a1cc7

2 files changed, 323 insertions, 0 deletions

diff --git a/usb-spi/Makefile b/usb-spi/Makefile
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index 0000000..59bb14c
--- /dev/null
+++ b/usb-spi/Makefile
@@ -0,0 +1,39 @@
+##

+##  spreadspace avr utils

+##

+##

+##  Copyright (C) 2012 Christian Pointner <equinox@spreadspace.org>

+##

+##  This file is part of spreadspace avr utils.

+##

+##  spreadspace avr utils is free software: you can redistribute it and/or modify

+##  it under the terms of the GNU General Public License as published by

+##  the Free Software Foundation, either version 3 of the License, or

+##  any later version.

+##

+##  spreadspace avr utils is distributed in the hope that it will be useful,

+##  but WITHOUT ANY WARRANTY; without even the implied warranty of

+##  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+##  GNU General Public License for more details.

+##

+##  You should have received a copy of the GNU General Public License

+##  along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.

+##

+

+NAME := usb-spi

+BOARD_TYPE := teensy2

+OBJ := $(NAME).o

+LIBS := util led lufa-descriptor-usbserial

+EXTERNAL_LIBS := lufa

+

+LUFA_PATH := ../contrib/LUFA-120219

+LUFA_OPTS  = -D USB_DEVICE_ONLY

+LUFA_OPTS += -D DEVICE_STATE_AS_GPIOR=0

+LUFA_OPTS += -D ORDERED_EP_CONFIG

+LUFA_OPTS += -D FIXED_CONTROL_ENDPOINT_SIZE=8

+LUFA_OPTS += -D FIXED_NUM_CONFIGURATIONS=1

+LUFA_OPTS += -D USE_FLASH_DESCRIPTORS

+LUFA_OPTS += -D USE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)"

+LUFA_OPTS += -D INTERRUPT_CONTROL_ENDPOINT

+

+include ../include.mk

diff --git a/usb-spi/usb-spi.c b/usb-spi/usb-spi.c
new file mode 100644
index 0000000..a4d578b
--- /dev/null
+++ b/usb-spi/usb-spi.c
@@ -0,0 +1,284 @@
+/*

+ *  spreadspace avr utils

+ *

+ *

+ *  Copyright (C) 2012 Christian Pointner <equinox@spreadspace.org>

+ *

+ *  This file is part of spreadspace avr utils.

+ *

+ *  spreadspace avr utils is free software: you can redistribute it and/or modify

+ *  it under the terms of the GNU General Public License as published by

+ *  the Free Software Foundation, either version 3 of the License, or

+ *  any later version.

+ *

+ *  spreadspace avr utils is distributed in the hope that it will be useful,

+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of

+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+ *  GNU General Public License for more details.

+ *

+ *  You should have received a copy of the GNU General Public License

+ *  along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.

+ */

+

+

+/* this is more or less the same as the LUFA example Project USBtoSerial and

+   this is their LICENSE Header */

+

+/*

+             LUFA Library

+     Copyright (C) Dean Camera, 2012.

+

+  dean [at] fourwalledcubicle [dot] com

+           www.lufa-lib.org

+*/

+

+/*

+  Copyright 2012  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 disclaim 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 USBtoSerial project. This file contains the main tasks of

+ *  the project and is responsible for the initial application hardware configuration.

+ */

+

+

+#include <avr/io.h>

+#include <avr/wdt.h>

+#include <avr/interrupt.h>

+#include <avr/power.h>

+

+#include "lufa-descriptor-usbserial.h"

+

+#include "util.h"

+#include "led.h"

+

+#include <LUFA/Version.h>

+#include <LUFA/Drivers/Peripheral/Serial.h>

+#include <LUFA/Drivers/Misc/RingBuffer.h>

+#include <LUFA/Drivers/USB/USB.h>

+

+    /* Function Prototypes: */

+void SetupHardware(void);

+

+void EVENT_USB_Device_Connect(void);

+void EVENT_USB_Device_Disconnect(void);

+void EVENT_USB_Device_ConfigurationChanged(void);

+void EVENT_USB_Device_ControlRequest(void);

+

+void EVENT_CDC_Device_LineEncodingChanged(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo);

+

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

+static RingBuffer_t USBtoUSART_Buffer;

+

+/** Underlying data buffer for \ref USBtoUSART_Buffer, where the stored bytes are located. */

+static uint8_t      USBtoUSART_Buffer_Data[128];

+

+/** 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];

+

+/** 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         = 0,

+

+				.DataINEndpointNumber           = CDC_TX_EPNUM,

+				.DataINEndpointSize             = CDC_TXRX_EPSIZE,

+				.DataINEndpointDoubleBank       = false,

+

+				.DataOUTEndpointNumber          = CDC_RX_EPNUM,

+				.DataOUTEndpointSize            = CDC_TXRX_EPSIZE,

+				.DataOUTEndpointDoubleBank      = false,

+

+				.NotificationEndpointNumber     = CDC_NOTIFICATION_EPNUM,

+				.NotificationEndpointSize       = CDC_NOTIFICATION_EPSIZE,

+				.NotificationEndpointDoubleBank = false,

+			},

+	};

+

+

+/** 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, USBtoUSART_Buffer_Data, sizeof(USBtoUSART_Buffer_Data));

+	RingBuffer_InitBuffer(&USARTtoUSB_Buffer, USARTtoUSB_Buffer_Data, sizeof(USARTtoUSB_Buffer_Data));

+

+	sei();

+

+	for (;;)

+	{

+		/* Only try to read in bytes from the CDC interface if the transmit buffer is not full */

+		if (!(RingBuffer_IsFull(&USBtoUSART_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(&USBtoUSART_Buffer, ReceivedByte);

+		}

+

+		/* Check if the UART receive buffer flush timer has expired or the buffer is nearly full */

+		uint16_t BufferCount = RingBuffer_GetCount(&USARTtoUSB_Buffer);

+		if ((TIFR0 & (1 << TOV0)) || (BufferCount > (uint8_t)(sizeof(USARTtoUSB_Buffer_Data) * .75)))

+		{

+			/* 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(&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);

+			}

+		}

+

+		/* Load the next byte from the USART transmit buffer into the USART */

+		if (!(RingBuffer_IsEmpty(&USBtoUSART_Buffer)))

+		  Serial_SendByte(RingBuffer_Remove(&USBtoUSART_Buffer));

+

+		CDC_Device_USBTask(&VirtualSerial_CDC_Interface);

+		USB_USBTask();

+	}

+}

+

+/** Configures the board hardware and chip peripherals for the demo's functionality. */

+void SetupHardware(void)

+{

+	/* Disable watchdog if enabled by bootloader/fuses */

+	MCUSR &= ~(1 << WDRF);

+	wdt_disable();

+

+  cpu_init();

+  led_init();

+	USB_Init();

+

+	/* 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 Connection event. */

+void EVENT_USB_Device_Connect(void)

+{

+  led_on();

+}

+

+/** Event handler for the library USB Disconnection event. */

+void EVENT_USB_Device_Disconnect(void)

+{

+  led_off();

+}

+

+/** 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);

+

+  led_toggle();

+  _delay_ms(10);

+  led_toggle();

+}

+

+/** Event handler for the library USB Control Request reception event. */

+void EVENT_USB_Device_ControlRequest(void)

+{

+	CDC_Device_ProcessControlRequest(&VirtualSerial_CDC_Interface);

+}

+

+/** 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 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));

+}

+