2 FreeRTOS V7.4.1 - Copyright (C) 2013 Real Time Engineers Ltd.
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4 FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT
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5 http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS tutorial books are available in pdf and paperback. *
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10 * Complete, revised, and edited pdf reference manuals are also *
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13 * Purchasing FreeRTOS documentation will not only help you, by *
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14 * ensuring you get running as quickly as possible and with an *
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15 * in-depth knowledge of how to use FreeRTOS, it will also help *
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16 * the FreeRTOS project to continue with its mission of providing *
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17 * professional grade, cross platform, de facto standard solutions *
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18 * for microcontrollers - completely free of charge! *
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20 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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22 * Thank you for using FreeRTOS, and thank you for your support! *
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24 ***************************************************************************
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27 This file is part of the FreeRTOS distribution.
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29 FreeRTOS is free software; you can redistribute it and/or modify it under
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30 the terms of the GNU General Public License (version 2) as published by the
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31 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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33 >>>>>>NOTE<<<<<< The modification to the GPL is included to allow you to
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34 distribute a combined work that includes FreeRTOS without being obliged to
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35 provide the source code for proprietary components outside of the FreeRTOS
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38 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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39 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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40 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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41 details. You should have received a copy of the GNU General Public License
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42 and the FreeRTOS license exception along with FreeRTOS; if not it can be
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43 viewed here: http://www.freertos.org/a00114.html and also obtained by
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44 writing to Real Time Engineers Ltd., contact details for whom are available
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45 on the FreeRTOS WEB site.
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49 ***************************************************************************
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51 * Having a problem? Start by reading the FAQ "My application does *
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52 * not run, what could be wrong?" *
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54 * http://www.FreeRTOS.org/FAQHelp.html *
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56 ***************************************************************************
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59 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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60 license and Real Time Engineers Ltd. contact details.
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62 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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63 including FreeRTOS+Trace - an indispensable productivity tool, and our new
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64 fully thread aware and reentrant UDP/IP stack.
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66 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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67 Integrity Systems, who sell the code with commercial support,
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68 indemnification and middleware, under the OpenRTOS brand.
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70 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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71 engineered and independently SIL3 certified version for use in safety and
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72 mission critical applications that require provable dependability.
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76 Sample interrupt driven USB device driver. This is a minimal implementation
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77 for demonstration only. Although functional, it is not a full and compliant
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80 The USB device enumerates as a simple 3 axis joystick, and once configured
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81 transmits 3 axis of data which can be viewed from the USB host machine.
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83 This file implements the USB interrupt service routine, and a demo FreeRTOS
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84 task. The interrupt service routine handles the USB hardware - taking a
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85 snapshot of the USB status at the point of the interrupt. The task receives
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86 the status information from the interrupt for processing at the task level.
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88 See the FreeRTOS.org WEB documentation for more information.
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94 + Descriptors that have a length that is an exact multiple of usbFIFO_LENGTH
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95 can now be transmitted. To this end an extra parameter has been
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96 added to the prvSendControlData() function, and the state
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97 eSENDING_EVEN_DESCRIPTOR has been introduced. Thanks to Scott Miller for
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98 assisting with this contribution.
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100 Changes from V2.6.0
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102 + Replaced the duplicated RX_DATA_BK0 in the interrupt mask with the
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106 /* Standard includes. */
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107 #include <string.h>
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109 /* Demo board includes. */
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112 /* Scheduler includes. */
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113 #include "FreeRTOS.h"
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118 /* Descriptor type definitions. */
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119 #define usbDESCRIPTOR_TYPE_DEVICE ( 0x01 )
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120 #define usbDESCRIPTOR_TYPE_CONFIGURATION ( 0x02 )
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121 #define usbDESCRIPTOR_TYPE_STRING ( 0x03 )
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123 /* USB request type definitions. */
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124 #define usbGET_REPORT_REQUEST ( 0x01 )
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125 #define usbGET_IDLE_REQUEST ( 0x02 )
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126 #define usbGET_PROTOCOL_REQUEST ( 0x03 )
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127 #define usbSET_REPORT_REQUEST ( 0x09 )
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128 #define usbSET_IDLE_REQUEST ( 0x0A )
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129 #define usbSET_PROTOCOL_REQUEST ( 0x0B )
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130 #define usbGET_CONFIGURATION_REQUEST ( 0x08 )
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131 #define usbGET_STATUS_REQUEST ( 0x00 )
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132 #define usbCLEAR_FEATURE_REQUEST ( 0x01 )
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133 #define usbSET_FEATURE_REQUEST ( 0x03 )
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134 #define usbSET_ADDRESS_REQUEST ( 0x05 )
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135 #define usbGET_DESCRIPTOR_REQUEST ( 0x06 )
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136 #define usbSET_CONFIGURATION_REQUEST ( 0x09 )
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137 #define usbGET_INTERFACE_REQUEST ( 0x0A )
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138 #define usbSET_INTERFACE_REQUEST ( 0x0B )
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141 /* Misc USB definitions. */
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142 #define usbDEVICE_CLASS_VENDOR_SPECIFIC ( 0xFF )
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143 #define usbBUS_POWERED ( 0x80 )
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144 #define usbHID_REPORT_DESCRIPTOR ( 0x22 )
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145 #define AT91C_UDP_TRANSCEIVER_ENABLE ( *( ( unsigned long * ) 0xfffb0074 ) )
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147 /* Index to the various string. */
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148 #define usbLANGUAGE_STRING ( 0 )
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149 #define usbMANUFACTURER_STRING ( 1 )
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150 #define usbPRODUCT_STRING ( 2 )
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151 #define usbCONFIGURATION_STRING ( 3 )
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152 #define usbINTERFACE_STRING ( 4 )
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154 /* Data indexes for reading the request from the xISRStatus.ucFifoData[]
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155 into xUSB_REQUEST. The data order is designed for speed - so looks a
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157 #define usbREQUEST_TYPE_INDEX ( 7 )
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158 #define usbREQUEST_INDEX ( 6 )
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159 #define usbVALUE_HIGH_BYTE ( 4 )
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160 #define usbVALUE_LOW_BYTE ( 5 )
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161 #define usbINDEX_HIGH_BYTE ( 2 )
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162 #define usbINDEX_LOW_BYTE ( 3 )
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163 #define usbLENGTH_HIGH_BYTE ( 0 )
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164 #define usbLENGTH_LOW_BYTE ( 1 )
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166 /* Misc application definitions. */
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167 #define usbINTERRUPT_PRIORITY ( 3 )
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168 #define usbQUEUE_LENGTH ( 0x3 ) /* Must have all bits set! */
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169 #define usbFIFO_LENGTH ( ( unsigned long ) 8 )
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170 #define usbEND_POINT_0 ( 0 )
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171 #define usbEND_POINT_1 ( 1 )
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172 #define usbXUP ( 1 )
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173 #define usbXDOWN ( 2 )
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174 #define usbYUP ( 3 )
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175 #define usbYDOWN ( 4 )
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176 #define usbMAX_COORD ( 120 )
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177 #define usbMAX_TX_MESSAGE_SIZE ( 128 )
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178 #define usbRX_COUNT_MASK ( ( unsigned long ) 0x7ff )
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179 #define AT91C_UDP_STALLSENT AT91C_UDP_ISOERROR
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180 #define usbSHORTEST_DELAY ( ( portTickType ) 1 )
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181 #define usbINIT_DELAY ( ( portTickType ) 500 / portTICK_RATE_MS )
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182 #define usbSHORT_DELAY ( ( portTickType ) 50 / portTICK_RATE_MS )
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183 #define usbEND_POINT_RESET_MASK ( ( unsigned long ) 0x0f )
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184 #define usbDATA_INC ( ( char ) 5 )
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185 #define usbEXPECTED_NUMBER_OF_BYTES ( ( unsigned long ) 8 )
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187 /* Control request types. */
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188 #define usbSTANDARD_DEVICE_REQUEST ( 0 )
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189 #define usbSTANDARD_INTERFACE_REQUEST ( 1 )
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190 #define usbSTANDARD_END_POINT_REQUEST ( 2 )
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191 #define usbCLASS_INTERFACE_REQUEST ( 5 )
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193 /*-----------------------------------------------------------*/
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195 /* Structure used to take a snapshot of the USB status from within the ISR. */
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196 typedef struct X_ISR_STATUS
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198 unsigned long ulISR;
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199 unsigned long ulCSR0;
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200 unsigned char ucFifoData[ 8 ];
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203 /* Structure used to hold the received requests. */
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206 unsigned char ucReqType;
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207 unsigned char ucRequest;
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208 unsigned short usValue;
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209 unsigned short usIndex;
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210 unsigned short usLength;
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219 eSENDING_EVEN_DESCRIPTOR,
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223 /* Structure used to control the data being sent to the host. */
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226 unsigned char ucTxBuffer[ usbMAX_TX_MESSAGE_SIZE ];
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227 unsigned long ulNextCharIndex;
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228 unsigned long ulTotalDataLength;
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231 /*-----------------------------------------------------------*/
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234 * The USB interrupt service routine. This takes a snapshot of the USB
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235 * device at the time of the interrupt, clears the interrupts, and posts
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236 * the data to the USB processing task.
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238 __arm void vUSB_ISR( void );
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241 * Called after the bus reset interrupt - this function readies all the
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242 * end points for communication.
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244 static void prvResetEndPoints( void );
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247 * Setup the USB hardware, install the interrupt service routine and
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248 * initialise all the state variables.
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250 static void vInitUSBInterface( void );
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253 * Decode and act upon an interrupt generated by the control end point.
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255 static void prvProcessEndPoint0Interrupt( xISRStatus *pxMessage );
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258 * For simplicity requests are separated into device, interface, class
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259 * interface and end point requests.
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261 * Decode and handle standard device requests originating on the control
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264 static void prvHandleStandardDeviceRequest( xUSB_REQUEST *pxRequest );
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267 * For simplicity requests are separated into device, interface, class
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268 * interface and end point requests.
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270 * Decode and handle standard interface requests originating on the control
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273 static void prvHandleStandardInterfaceRequest( xUSB_REQUEST *pxRequest );
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276 * For simplicity requests are separated into device, interface, class
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277 * interface and end point requests.
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279 * Decode and handle standard end point requests originating on the control
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282 static void prvHandleStandardEndPointRequest( xUSB_REQUEST *pxRequest );
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285 * For simplicity requests are separated into device, interface, class
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286 * interface and end point requests.
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288 * Decode and handle the class interface requests.
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290 static void prvHandleClassInterfaceRequest( xUSB_REQUEST *pxRequest );
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293 * Setup the Tx buffer to send data in response to a control request.
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295 * The data to be transmitted is buffered, the state variables are updated,
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296 * then prvSendNextSegment() is called to start the transmission off. Once
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297 * the first segment has been sent the remaining segments are transmitted
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298 * in response to TXCOMP interrupts until the entire buffer has been
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301 static void prvSendControlData( unsigned char *pucData, unsigned short usRequestedLength, unsigned long ulLengthLeftToSend, long lSendingDescriptor );
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304 * Examine the Tx buffer to see if there is any more data to be transmitted.
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306 * If there is data to be transmitted then send the next segment. A segment
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307 * can have a maximum of 8 bytes (this is defined as the maximum for the end
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308 * point by the descriptor). The final segment may be less than 8 bytes if
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309 * the total data length was not an exact multiple of 8.
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311 static void prvSendNextSegment( void );
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314 * A stall condition is forced each time the host makes a request that is not
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315 * supported by this minimal implementation.
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317 * A stall is forced by setting the appropriate bit in the end points control
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318 * and status register.
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320 static void prvSendStall( void );
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323 * A NULL (or zero length packet) is transmitted in acknowledge the reception
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324 * of certain events from the host.
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326 static void prvUSBTransmitNull( void );
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329 * When the host requests a descriptor this function is called to determine
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330 * which descriptor is being requested and start its transmission.
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332 static void prvGetStandardInterfaceDescriptor( xUSB_REQUEST *pxRequest );
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335 * This demo USB device enumerates as a simple 3 axis joystick. Once
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336 * configured this function is periodically called to generate some sample
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339 * The x and y axis are made to move in a square. The z axis is made to
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340 * repeatedly increment up to its maximum.
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342 static void prvTransmitSampleValues( void );
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345 * The created task to handle the USB demo functionality.
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347 void vUSBDemoTask( void *pvParameters );
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349 /*-----------------------------------------------------------*/
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352 - DESCRIPTOR DEFINITIONS -
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355 /* String descriptors used during the enumeration process.
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356 These take the form:
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359 Length of descriptor,
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364 const char pxLanguageStringDescriptor[] =
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367 usbDESCRIPTOR_TYPE_STRING,
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371 const char pxManufacturerStringDescriptor[] =
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374 usbDESCRIPTOR_TYPE_STRING,
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386 const char pxProductStringDescriptor[] =
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389 usbDESCRIPTOR_TYPE_STRING,
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414 const char pxConfigurationStringDescriptor[] =
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417 usbDESCRIPTOR_TYPE_STRING,
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439 const char pxInterfaceStringDescriptor[] =
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442 usbDESCRIPTOR_TYPE_STRING,
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460 /* Enumeration descriptors. */
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461 const char pxReportDescriptor[] =
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463 0x05, 0x01, /* USAGE_PAGE (Generic Desktop) */
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464 0x09, 0x04, /* USAGE (Joystick) */
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465 0xa1, 0x01, /* COLLECTION (Application) */
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466 0x05, 0x01, /* USAGE_PAGE (Generic Desktop) */
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467 0x09, 0x01, /* USAGE (Pointer) */
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468 0xa1, 0x00, /* COLLECTION (Physical) */
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469 0x09, 0x30, /* USAGE (X) */
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470 0x09, 0x31, /* USAGE (Y) */
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471 0x09, 0x32, /* USAGE (Z) */
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472 0x15, 0x81, /* LOGICAL_MINIMUM (-127) */
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473 0x25, 0x7f, /* LOGICAL_MAXIMUM (127) */
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474 0x75, 0x08, /* REPORT_SIZE (8) */
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475 0x95, 0x03, /* REPORT_COUNT (3) */
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476 0x81, 0x02, /* INPUT (Data,Var,Abs) */
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477 0xc0, /* END_COLLECTION */
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478 0xc0 /* END_COLLECTION */
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481 const char pxDeviceDescriptor[] =
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483 /* Device descriptor */
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484 0x12, /* bLength */
\r
485 0x01, /* bDescriptorType */
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486 0x10, 0x01, /* bcdUSBL */
\r
487 usbDEVICE_CLASS_VENDOR_SPECIFIC, /* bDeviceClass: */
\r
488 0x00, /* bDeviceSubclass: */
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489 0x00, /* bDeviceProtocol: */
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490 0x08, /* bMaxPacketSize0 */
\r
491 0xFF, 0xFF, /* idVendorL */
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492 0x01, 0x00, /* idProductL */
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493 0x00, 0x01, /* bcdDeviceL */
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494 usbMANUFACTURER_STRING, /* iManufacturer */
\r
495 usbPRODUCT_STRING, /* iProduct */
\r
496 0x00, /* SerialNumber */
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497 0x01 /* bNumConfigs */
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500 const char pxConfigDescriptor[] = {
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501 /* Configuration 1 descriptor */
\r
502 0x09, /* CbLength */
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503 0x02, /* CbDescriptorType */
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504 0x22, 0x00, /* CwTotalLength 2 EP + Control */
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505 0x01, /* CbNumInterfaces */
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506 0x01, /* CbConfigurationValue */
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507 usbCONFIGURATION_STRING,/* CiConfiguration */
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508 usbBUS_POWERED, /* CbmAttributes Bus powered + Remote Wakeup*/
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509 0x32, /* CMaxPower: 100mA */
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511 /* Joystick Interface Descriptor Requirement */
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512 0x09, /* bLength */
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513 0x04, /* bDescriptorType */
\r
514 0x00, /* bInterfaceNumber */
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515 0x00, /* bAlternateSetting */
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516 0x01, /* bNumEndpoints */
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517 0x03, /* bInterfaceClass: HID code */
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518 0x00, /* bInterfaceSubclass */
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519 0x00, /* bInterfaceProtocol */
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520 usbINTERFACE_STRING,/* iInterface */
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522 /* HID Descriptor */
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523 0x09, /* bLength */
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524 0x21, /* bDescriptor type: HID Descriptor Type */
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525 0x00, 0x01, /* bcdHID */
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526 0x00, /* bCountryCode */
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527 0x01, /* bNumDescriptors */
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528 usbHID_REPORT_DESCRIPTOR, /* bDescriptorType */
\r
529 sizeof( pxReportDescriptor ), 0x00, /* wItemLength */
\r
531 /* Endpoint 1 descriptor */
\r
532 0x07, /* bLength */
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533 0x05, /* bDescriptorType */
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534 0x81, /* bEndpointAddress, Endpoint 01 - IN */
\r
535 0x03, /* bmAttributes INT */
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536 0x03, 0x00, /* wMaxPacketSize: 3 bytes (x, y, z) */
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537 0x0A /* bInterval */
\r
540 /*-----------------------------------------------------------*/
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542 /* File scope state variables. */
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543 static unsigned char ucUSBConfig = ( unsigned char ) 0;
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544 static unsigned long ulReceivedAddress = ( unsigned long ) 0;
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545 static eDRIVER_STATE eDriverState = eNOTHING;
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547 /* Array in which the USB interrupt status is passed between the ISR and task. */
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548 static xISRStatus xISRMessages[ usbQUEUE_LENGTH + 1 ];
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550 /* Structure used to control the characters being sent to the host. */
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551 static xTX_MESSAGE pxCharsForTx;
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553 /* Queue used to pass messages between the ISR and the task. */
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554 static xQueueHandle xUSBInterruptQueue;
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556 /* ISR entry has to be written in the asm file as we want a context switch
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557 to occur from within the ISR. See the port documentation on the FreeRTOS.org
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558 WEB site for more information. */
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559 extern void vUSBISREntry( void );
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561 /*-----------------------------------------------------------*/
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563 /* Macros to manipulate the control and status registers. These registers
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564 cannot be accessed using a direct read modify write operation outside of the
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565 ISR as some bits are left unchanged by writing with a 0, and some are left
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566 unchanged by writing with a 1. */
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568 #define usbINT_CLEAR_MASK (AT91C_UDP_TXCOMP | AT91C_UDP_STALLSENT | AT91C_UDP_RXSETUP | AT91C_UDP_RX_DATA_BK0 | AT91C_UDP_RX_DATA_BK1 )
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570 #define usbCSR_SET_BIT( pulValueNow, ulBit ) \
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572 /* Set TXCOMP, RX_DATA_BK0, RXSETUP, */ \
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573 /* STALLSENT and RX_DATA_BK1 to 1 so the */ \
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574 /* write has no effect. */ \
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575 ( * ( ( unsigned long * ) pulValueNow ) ) |= ( unsigned long ) 0x4f; \
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577 /* Clear the FORCE_STALL and TXPKTRDY bits */ \
\r
578 /* so the write has no effect. */ \
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579 ( * ( ( unsigned long * ) pulValueNow ) ) &= ( unsigned long ) 0xffffffcf; \
\r
581 /* Set whichever bit we want set. */ \
\r
582 ( * ( ( unsigned long * ) pulValueNow ) ) |= ( ulBit ); \
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585 #define usbCSR_CLEAR_BIT( pulValueNow, ulBit ) \
\r
587 /* Set TXCOMP, RX_DATA_BK0, RXSETUP, */ \
\r
588 /* STALLSENT and RX_DATA_BK1 to 1 so the */ \
\r
589 /* write has no effect. */ \
\r
590 ( * ( ( unsigned long * ) pulValueNow ) ) |= ( unsigned long ) 0x4f; \
\r
592 /* Clear the FORCE_STALL and TXPKTRDY bits */ \
\r
593 /* so the write has no effect. */ \
\r
594 ( * ( ( unsigned long * ) pulValueNow ) ) &= ( unsigned long ) 0xffffffcf; \
\r
596 /* Clear whichever bit we want clear. */ \
\r
597 ( * ( ( unsigned long * ) pulValueNow ) ) &= ( ~ulBit ); \
\r
600 /*-----------------------------------------------------------*/
\r
602 __arm void vUSB_ISR( void )
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604 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
\r
605 static volatile unsigned long ulNextMessage = 0;
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606 xISRStatus *pxMessage;
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607 unsigned long ulTemp, ulRxBytes;
\r
609 /* Take the next message from the queue. Note that usbQUEUE_LENGTH *must*
\r
610 be all 1's, as in 0x01, 0x03, 0x07, etc. */
\r
611 pxMessage = &( xISRMessages[ ( ulNextMessage & usbQUEUE_LENGTH ) ] );
\r
614 /* Take a snapshot of the current USB state for processing at the task
\r
616 pxMessage->ulISR = AT91C_BASE_UDP->UDP_ISR;
\r
617 pxMessage->ulCSR0 = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ];
\r
619 /* Clear the interrupts from the ICR register. The bus end interrupt is
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620 cleared separately as it does not appear in the mask register. */
\r
621 AT91C_BASE_UDP->UDP_ICR = AT91C_BASE_UDP->UDP_IMR | AT91C_UDP_ENDBUSRES;
\r
623 /* If there are bytes in the FIFO then we have to retrieve them here.
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624 Ideally this would be done at the task level. However we need to clear the
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625 RXSETUP interrupt before leaving the ISR, and this may cause the data in
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626 the FIFO to be overwritten. Also the DIR bit has to be changed before the
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627 RXSETUP bit is cleared (as per the SAM7 manual). */
\r
628 ulTemp = pxMessage->ulCSR0;
\r
630 /* Are there any bytes in the FIFO? */
\r
631 ulRxBytes = ulTemp >> 16;
\r
632 ulRxBytes &= usbRX_COUNT_MASK;
\r
634 /* With this minimal implementation we are only interested in receiving
\r
635 setup bytes on the control end point. */
\r
636 if( ( ulRxBytes > 0 ) && ( ulTemp & AT91C_UDP_RXSETUP ) )
\r
638 /* Take off 1 for a zero based index. */
\r
639 while( ulRxBytes > 0 )
\r
642 pxMessage->ucFifoData[ ulRxBytes ] = AT91C_BASE_UDP->UDP_FDR[ usbEND_POINT_0 ];
\r
645 /* The direction must be changed first. */
\r
646 usbCSR_SET_BIT( &ulTemp, ( AT91C_UDP_DIR ) );
\r
647 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] = ulTemp;
\r
650 /* Must write zero's to TXCOMP, STALLSENT, RXSETUP, and the RX DATA
\r
651 registers to clear the interrupts in the CSR register. */
\r
652 usbCSR_CLEAR_BIT( &ulTemp, usbINT_CLEAR_MASK );
\r
653 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] = ulTemp;
\r
655 /* Also clear the interrupts in the CSR1 register. */
\r
656 ulTemp = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ];
\r
657 usbCSR_CLEAR_BIT( &ulTemp, usbINT_CLEAR_MASK );
\r
658 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ] = ulTemp;
\r
660 /* The message now contains the entire state and optional data from
\r
661 the USB interrupt. This can now be posted on the Rx queue ready for
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662 processing at the task level. */
\r
663 xQueueSendFromISR( xUSBInterruptQueue, &pxMessage, &xHigherPriorityTaskWoken );
\r
665 /* We may want to switch to the USB task, if this message has made
\r
666 it the highest priority task that is ready to execute. */
\r
667 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
\r
669 /* Clear the AIC ready for the next interrupt. */
\r
670 AT91C_BASE_AIC->AIC_EOICR = 0;
\r
672 /*-----------------------------------------------------------*/
\r
674 void vUSBDemoTask( void *pvParameters )
\r
676 xISRStatus *pxMessage;
\r
678 /* The parameters are not used in this task. */
\r
679 ( void ) pvParameters;
\r
681 /* Init USB device */
\r
682 portENTER_CRITICAL();
\r
683 vInitUSBInterface();
\r
684 portEXIT_CRITICAL();
\r
686 /* Process interrupts as they arrive. The ISR takes a snapshot of the
\r
687 interrupt status then posts the information on this queue for processing
\r
688 at the task level. This simple demo implementation only processes
\r
689 a few interrupt sources. */
\r
692 if( xQueueReceive( xUSBInterruptQueue, &pxMessage, usbSHORT_DELAY ) )
\r
694 if( pxMessage->ulISR & AT91C_UDP_EPINT0 )
\r
696 /* Process end point 0 interrupt. */
\r
697 prvProcessEndPoint0Interrupt( pxMessage );
\r
700 if( pxMessage->ulISR & AT91C_UDP_ENDBUSRES )
\r
702 /* Process an end of bus reset interrupt. */
\r
703 prvResetEndPoints();
\r
708 /* The ISR did not post any data for us to process on the queue, so
\r
709 just generate and send some sample data. */
\r
710 if( eDriverState == eREADY_TO_SEND )
\r
712 prvTransmitSampleValues();
\r
717 /*-----------------------------------------------------------*/
\r
719 static void prvTransmitSampleValues( void )
\r
721 unsigned long ulStatus;
\r
722 static long lState = usbXUP;
\r
724 /* Variables to hold dummy x, y and z joystick axis data. */
\r
725 static signed char x = 0, y = 0, z = 0;
\r
727 /* Generate some sample data in the x and y axis - draw a square. */
\r
730 case usbXUP : x += usbDATA_INC;
\r
731 if( x >= usbMAX_COORD )
\r
737 case usbXDOWN : x -= usbDATA_INC;
\r
738 if( x <= -usbMAX_COORD )
\r
744 case usbYUP : y += usbDATA_INC;
\r
745 if( y >= usbMAX_COORD )
\r
751 case usbYDOWN : y -= usbDATA_INC;
\r
752 if( y <= -usbMAX_COORD )
\r
759 /* Just make the z axis go up and down. */
\r
762 /* Can we place data in the fifo? */
\r
763 if( !( AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ] & AT91C_UDP_TXPKTRDY ) )
\r
765 /* Write our sample data to the fifo. */
\r
766 AT91C_BASE_UDP->UDP_FDR[ usbEND_POINT_1 ] = x;
\r
767 AT91C_BASE_UDP->UDP_FDR[ usbEND_POINT_1 ] = y;
\r
768 AT91C_BASE_UDP->UDP_FDR[ usbEND_POINT_1 ] = z;
\r
770 /* Send the data. */
\r
771 portENTER_CRITICAL();
\r
773 ulStatus = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ];
\r
774 usbCSR_SET_BIT( &ulStatus, ( AT91C_UDP_TXPKTRDY ) );
\r
775 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ] = ulStatus;
\r
777 portEXIT_CRITICAL();
\r
780 /*-----------------------------------------------------------*/
\r
782 static void prvUSBTransmitNull( void )
\r
784 unsigned long ulStatus;
\r
786 /* Wait until the FIFO is free - even though we are not going to use it.
\r
787 THERE IS NO TIMEOUT HERE! */
\r
788 while( AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] & AT91C_UDP_TXPKTRDY )
\r
790 vTaskDelay( usbSHORTEST_DELAY );
\r
793 portENTER_CRITICAL();
\r
795 /* Set the length of data to send to equal the index of the next byte
\r
796 to send. This will prevent the ACK to this NULL packet causing any
\r
797 further data transmissions. */
\r
798 pxCharsForTx.ulTotalDataLength = pxCharsForTx.ulNextCharIndex;
\r
800 /* Set the TXPKTRDY bit to cause a transmission with no data. */
\r
801 ulStatus = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ];
\r
802 usbCSR_SET_BIT( &ulStatus, ( AT91C_UDP_TXPKTRDY ) );
\r
803 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] = ulStatus;
\r
805 portEXIT_CRITICAL();
\r
807 /*-----------------------------------------------------------*/
\r
809 static void prvSendStall( void )
\r
811 unsigned long ulStatus;
\r
813 portENTER_CRITICAL();
\r
815 /* Force a stall by simply setting the FORCESTALL bit in the CSR. */
\r
816 ulStatus = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ];
\r
817 usbCSR_SET_BIT( &ulStatus, AT91C_UDP_FORCESTALL );
\r
818 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] = ulStatus;
\r
820 portEXIT_CRITICAL();
\r
822 /*-----------------------------------------------------------*/
\r
824 static void prvResetEndPoints( void )
\r
826 unsigned long ulTemp;
\r
828 eDriverState = eJUST_RESET;
\r
830 /* Reset all the end points. */
\r
831 AT91C_BASE_UDP->UDP_RSTEP = usbEND_POINT_RESET_MASK;
\r
832 AT91C_BASE_UDP->UDP_RSTEP = ( unsigned long ) 0x00;
\r
834 /* Enable data to be sent and received. */
\r
835 AT91C_BASE_UDP->UDP_FADDR = AT91C_UDP_FEN;
\r
837 /* Repair the configuration end point. */
\r
838 portENTER_CRITICAL();
\r
840 ulTemp = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ];
\r
841 usbCSR_SET_BIT( &ulTemp, ( ( unsigned long ) ( AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_CTRL ) ) );
\r
842 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] = ulTemp;
\r
843 AT91F_UDP_EnableIt( AT91C_BASE_UDP, AT91C_UDP_EPINT0 );
\r
845 portEXIT_CRITICAL();
\r
847 /*-----------------------------------------------------------*/
\r
849 static void prvProcessEndPoint0Interrupt( xISRStatus *pxMessage )
\r
851 if( pxMessage->ulCSR0 & AT91C_UDP_RX_DATA_BK0 )
\r
853 /* We only expect to receive zero length data here as ACK's.
\r
854 Set the data pointer to the end of the current Tx packet to
\r
855 ensure we don't send out any more data. */
\r
856 pxCharsForTx.ulNextCharIndex = pxCharsForTx.ulTotalDataLength;
\r
859 if( pxMessage->ulCSR0 & AT91C_UDP_TXCOMP )
\r
861 /* We received a TX complete interrupt. What we do depends on
\r
862 what we sent to get this interrupt. */
\r
864 if( eDriverState == eJUST_GOT_CONFIG )
\r
866 /* We sent an acknowledgement of a SET_CONFIG request. We
\r
867 are now at the end of the enumeration. */
\r
868 AT91C_BASE_UDP->UDP_GLBSTATE = AT91C_UDP_CONFG;
\r
870 /* Read the end point for data transfer. */
\r
871 portENTER_CRITICAL();
\r
873 unsigned long ulTemp;
\r
875 ulTemp = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ];
\r
876 usbCSR_SET_BIT( &ulTemp, AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_INT_IN );
\r
877 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ] = ulTemp;
\r
878 AT91F_UDP_EnableIt( AT91C_BASE_UDP, AT91C_UDP_EPINT1 );
\r
880 portEXIT_CRITICAL();
\r
882 eDriverState = eREADY_TO_SEND;
\r
884 else if( eDriverState == eJUST_GOT_ADDRESS )
\r
886 /* We sent an acknowledgement of a SET_ADDRESS request. Move
\r
887 to the addressed state. */
\r
888 if( ulReceivedAddress != ( unsigned long ) 0 )
\r
890 AT91C_BASE_UDP->UDP_GLBSTATE = AT91C_UDP_FADDEN;
\r
894 AT91C_BASE_UDP->UDP_GLBSTATE = 0;
\r
897 AT91C_BASE_UDP->UDP_FADDR = ( AT91C_UDP_FEN | ulReceivedAddress );
\r
898 eDriverState = eNOTHING;
\r
902 /* The TXCOMP was not for any special type of transmission. See
\r
903 if there is any more data to send. */
\r
904 prvSendNextSegment();
\r
908 if( pxMessage->ulCSR0 & AT91C_UDP_RXSETUP )
\r
910 xUSB_REQUEST xRequest;
\r
911 unsigned char ucRequest;
\r
912 unsigned long ulRxBytes;
\r
914 /* A data packet is available. */
\r
915 ulRxBytes = pxMessage->ulCSR0 >> 16;
\r
916 ulRxBytes &= usbRX_COUNT_MASK;
\r
918 if( ulRxBytes >= usbEXPECTED_NUMBER_OF_BYTES )
\r
920 /* Create an xUSB_REQUEST variable from the raw bytes array. */
\r
922 xRequest.ucReqType = pxMessage->ucFifoData[ usbREQUEST_TYPE_INDEX ];
\r
923 xRequest.ucRequest = pxMessage->ucFifoData[ usbREQUEST_INDEX ];
\r
925 /* NOT PORTABLE CODE! */
\r
926 xRequest.usValue = pxMessage->ucFifoData[ usbVALUE_HIGH_BYTE ];
\r
927 xRequest.usValue <<= 8;
\r
928 xRequest.usValue |= pxMessage->ucFifoData[ usbVALUE_LOW_BYTE ];
\r
930 xRequest.usIndex = pxMessage->ucFifoData[ usbINDEX_HIGH_BYTE ];
\r
931 xRequest.usIndex <<= 8;
\r
932 xRequest.usIndex |= pxMessage->ucFifoData[ usbINDEX_LOW_BYTE ];
\r
934 xRequest.usLength = pxMessage->ucFifoData[ usbLENGTH_HIGH_BYTE ];
\r
935 xRequest.usLength <<= 8;
\r
936 xRequest.usLength |= pxMessage->ucFifoData[ usbLENGTH_LOW_BYTE ];
\r
938 /* Manipulate the ucRequestType and the ucRequest parameters to
\r
939 generate a zero based request selection. This is just done to
\r
940 break up the requests into subsections for clarity. The
\r
941 alternative would be to have more huge switch statement that would
\r
942 be difficult to optimise. */
\r
943 ucRequest = ( ( xRequest.ucReqType & 0x60 ) >> 3 );
\r
944 ucRequest |= ( xRequest.ucReqType & 0x03 );
\r
946 switch( ucRequest )
\r
948 case usbSTANDARD_DEVICE_REQUEST:
\r
949 /* Standard Device request */
\r
950 prvHandleStandardDeviceRequest( &xRequest );
\r
953 case usbSTANDARD_INTERFACE_REQUEST:
\r
954 /* Standard Interface request */
\r
955 prvHandleStandardInterfaceRequest( &xRequest );
\r
958 case usbSTANDARD_END_POINT_REQUEST:
\r
959 /* Standard Endpoint request */
\r
960 prvHandleStandardEndPointRequest( &xRequest );
\r
963 case usbCLASS_INTERFACE_REQUEST:
\r
964 /* Class Interface request */
\r
965 prvHandleClassInterfaceRequest( &xRequest );
\r
968 default: /* This is not something we want to respond to. */
\r
974 /*-----------------------------------------------------------*/
\r
976 static void prvGetStandardDeviceDescriptor( xUSB_REQUEST *pxRequest )
\r
978 /* The type is in the high byte. Return whatever has been requested. */
\r
979 switch( ( pxRequest->usValue & 0xff00 ) >> 8 )
\r
981 case usbDESCRIPTOR_TYPE_DEVICE:
\r
982 prvSendControlData( ( unsigned char * ) &pxDeviceDescriptor, pxRequest->usLength, sizeof( pxDeviceDescriptor ), pdTRUE );
\r
985 case usbDESCRIPTOR_TYPE_CONFIGURATION:
\r
986 prvSendControlData( ( unsigned char * ) &( pxConfigDescriptor ), pxRequest->usLength, sizeof( pxConfigDescriptor ), pdTRUE );
\r
989 case usbDESCRIPTOR_TYPE_STRING:
\r
991 /* The index to the string descriptor is the lower byte. */
\r
992 switch( pxRequest->usValue & 0xff )
\r
994 case usbLANGUAGE_STRING:
\r
995 prvSendControlData( ( unsigned char * ) &pxLanguageStringDescriptor, pxRequest->usLength, sizeof(pxLanguageStringDescriptor), pdTRUE );
\r
998 case usbMANUFACTURER_STRING:
\r
999 prvSendControlData( ( unsigned char * ) &pxManufacturerStringDescriptor, pxRequest->usLength, sizeof( pxManufacturerStringDescriptor ), pdTRUE );
\r
1002 case usbPRODUCT_STRING:
\r
1003 prvSendControlData( ( unsigned char * ) &pxProductStringDescriptor, pxRequest->usLength, sizeof( pxProductStringDescriptor ), pdTRUE );
\r
1006 case usbCONFIGURATION_STRING:
\r
1007 prvSendControlData( ( unsigned char * ) &pxConfigurationStringDescriptor, pxRequest->usLength, sizeof( pxConfigurationStringDescriptor ), pdTRUE );
\r
1010 case usbINTERFACE_STRING:
\r
1011 prvSendControlData( ( unsigned char * ) &pxInterfaceStringDescriptor, pxRequest->usLength, sizeof( pxInterfaceStringDescriptor ), pdTRUE );
\r
1015 /* Don't know what this string is. */
\r
1023 /* We are not responding to anything else. */
\r
1028 /*-----------------------------------------------------------*/
\r
1030 static void prvHandleStandardDeviceRequest( xUSB_REQUEST *pxRequest )
\r
1032 unsigned short usStatus = 0;
\r
1034 switch( pxRequest->ucRequest )
\r
1036 case usbGET_STATUS_REQUEST:
\r
1037 /* Just send two byte dummy status. */
\r
1038 prvSendControlData( ( unsigned char * ) &usStatus, sizeof( usStatus ), sizeof( usStatus ), pdFALSE );
\r
1041 case usbGET_DESCRIPTOR_REQUEST:
\r
1042 /* Send device descriptor */
\r
1043 prvGetStandardDeviceDescriptor( pxRequest );
\r
1046 case usbGET_CONFIGURATION_REQUEST:
\r
1047 /* Send selected device configuration */
\r
1048 prvSendControlData( ( unsigned char * ) &ucUSBConfig, sizeof( ucUSBConfig ), sizeof( ucUSBConfig ), pdFALSE );
\r
1051 case usbSET_FEATURE_REQUEST:
\r
1052 prvUSBTransmitNull();
\r
1055 case usbSET_ADDRESS_REQUEST:
\r
1057 /* Acknowledge the SET_ADDRESS, but (according to the manual) we
\r
1058 cannot actually move to the addressed state until we get a TXCOMP
\r
1059 interrupt from this NULL packet. Therefore we just remember the
\r
1060 address and set our state so we know we have received the address. */
\r
1061 prvUSBTransmitNull();
\r
1062 eDriverState = eJUST_GOT_ADDRESS;
\r
1063 ulReceivedAddress = ( unsigned long ) pxRequest->usValue;
\r
1066 case usbSET_CONFIGURATION_REQUEST:
\r
1068 /* Acknowledge the SET_CONFIGURATION, but (according to the manual)
\r
1069 we cannot actually move to the configured state until we get a
\r
1070 TXCOMP interrupt from this NULL packet. Therefore we just remember the
\r
1071 config and set our state so we know we have received the go ahead. */
\r
1072 ucUSBConfig = ( unsigned char ) ( pxRequest->usValue & 0xff );
\r
1073 eDriverState = eJUST_GOT_CONFIG;
\r
1074 prvUSBTransmitNull();
\r
1079 /* We don't answer to anything else. */
\r
1084 /*-----------------------------------------------------------*/
\r
1086 static void prvHandleClassInterfaceRequest( xUSB_REQUEST *pxRequest )
\r
1088 switch( pxRequest->ucRequest )
\r
1090 case usbSET_IDLE_REQUEST:
\r
1091 prvUSBTransmitNull();
\r
1094 /* This minimal implementation ignores these. */
\r
1095 case usbGET_REPORT_REQUEST:
\r
1096 case usbGET_IDLE_REQUEST:
\r
1097 case usbGET_PROTOCOL_REQUEST:
\r
1098 case usbSET_REPORT_REQUEST:
\r
1099 case usbSET_PROTOCOL_REQUEST:
\r
1106 /*-----------------------------------------------------------*/
\r
1108 static void prvGetStandardInterfaceDescriptor( xUSB_REQUEST *pxRequest )
\r
1110 switch( ( pxRequest->usValue & ( unsigned short ) 0xff00 ) >> 8 )
\r
1112 case usbHID_REPORT_DESCRIPTOR:
\r
1113 prvSendControlData( ( unsigned char * ) pxReportDescriptor, pxRequest->usLength, sizeof( pxReportDescriptor ), pdTRUE );
\r
1118 /* Don't expect to send any others. */
\r
1123 /*-----------------------------------------------------------*/
\r
1125 static void prvHandleStandardInterfaceRequest( xUSB_REQUEST *pxRequest )
\r
1127 unsigned short usStatus = 0;
\r
1129 switch( pxRequest->ucRequest )
\r
1131 case usbGET_STATUS_REQUEST:
\r
1132 /* Send dummy 2 bytes. */
\r
1133 prvSendControlData( ( unsigned char * ) &usStatus, sizeof( usStatus ), sizeof( usStatus ), pdFALSE );
\r
1136 case usbGET_DESCRIPTOR_REQUEST:
\r
1137 prvGetStandardInterfaceDescriptor( pxRequest );
\r
1140 /* This minimal implementation does not respond to these. */
\r
1141 case usbGET_INTERFACE_REQUEST:
\r
1142 case usbSET_FEATURE_REQUEST:
\r
1143 case usbSET_INTERFACE_REQUEST:
\r
1150 /*-----------------------------------------------------------*/
\r
1152 static void prvHandleStandardEndPointRequest( xUSB_REQUEST *pxRequest )
\r
1154 switch( pxRequest->ucRequest )
\r
1156 /* This minimal implementation does not expect to respond to these. */
\r
1157 case usbGET_STATUS_REQUEST:
\r
1158 case usbCLEAR_FEATURE_REQUEST:
\r
1159 case usbSET_FEATURE_REQUEST:
\r
1166 /*-----------------------------------------------------------*/
\r
1168 static void vInitUSBInterface( void )
\r
1170 volatile unsigned long ulTemp;
\r
1172 /* Create the queue used to communicate between the USB ISR and task. */
\r
1173 xUSBInterruptQueue = xQueueCreate( usbQUEUE_LENGTH + 1, sizeof( xISRStatus * ) );
\r
1175 /* Initialise a few state variables. */
\r
1176 pxCharsForTx.ulNextCharIndex = ( unsigned long ) 0;
\r
1177 ucUSBConfig = ( unsigned char ) 0;
\r
1178 eDriverState = eNOTHING;
\r
1180 /* HARDWARE SETUP */
\r
1182 /* Set the PLL USB Divider */
\r
1183 AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1;
\r
1185 /* Enables the 48MHz USB clock UDPCK and System Peripheral USB Clock. */
\r
1186 AT91C_BASE_PMC->PMC_SCER = AT91C_PMC_UDP;
\r
1187 AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_UDP);
\r
1189 /* Setup the PIO for the USB pull up resistor. */
\r
1190 AT91F_PIO_CfgOutput(AT91C_BASE_PIOA,AT91C_PIO_PA16);
\r
1192 /* Start without the pullup - this will get set at the end of this
\r
1194 AT91F_PIO_SetOutput( AT91C_BASE_PIOA, AT91C_PIO_PA16 );
\r
1196 /* When using the USB debugger the peripheral registers do not always get
\r
1197 set to the correct default values. To make sure set the relevant registers
\r
1199 AT91C_BASE_UDP->UDP_IDR = ( unsigned long ) 0xffffffff;
\r
1200 AT91C_BASE_UDP->UDP_ICR = ( unsigned long ) 0xffffffff;
\r
1201 AT91C_BASE_UDP->UDP_CSR[ 0 ] = ( unsigned long ) 0x00;
\r
1202 AT91C_BASE_UDP->UDP_CSR[ 1 ] = ( unsigned long ) 0x00;
\r
1203 AT91C_BASE_UDP->UDP_GLBSTATE = 0;
\r
1204 AT91C_BASE_UDP->UDP_FADDR = 0;
\r
1206 /* Enable the transceiver. */
\r
1207 AT91C_UDP_TRANSCEIVER_ENABLE = 0;
\r
1209 /* Enable the USB interrupts - other interrupts get enabled as the
\r
1210 enumeration process progresses. */
\r
1211 AT91F_AIC_ConfigureIt( AT91C_BASE_AIC, AT91C_ID_UDP, usbINTERRUPT_PRIORITY, AT91C_AIC_SRCTYPE_INT_LEVEL_SENSITIVE, ( void (*)( void ) ) vUSBISREntry );
\r
1212 AT91F_AIC_EnableIt( AT91C_BASE_AIC, AT91C_ID_UDP );
\r
1214 /* Wait a short while before making our presence known. */
\r
1215 vTaskDelay( usbINIT_DELAY );
\r
1216 AT91F_PIO_ClearOutput(AT91C_BASE_PIOA, AT91C_PIO_PA16 );
\r
1218 /*-----------------------------------------------------------*/
\r
1220 static void prvSendControlData( unsigned char *pucData, unsigned short usRequestedLength, unsigned long ulLengthToSend, long lSendingDescriptor )
\r
1222 if( ( ( unsigned long ) usRequestedLength < ulLengthToSend ) )
\r
1224 /* Cap the data length to that requested. */
\r
1225 ulLengthToSend = ( unsigned short ) usRequestedLength;
\r
1227 else if( ( ulLengthToSend < ( unsigned long ) usRequestedLength ) && lSendingDescriptor )
\r
1229 /* We are sending a descriptor. If the descriptor is an exact
\r
1230 multiple of the FIFO length then it will have to be terminated
\r
1231 with a NULL packet. Set the state to indicate this if
\r
1233 if( ( ulLengthToSend % usbFIFO_LENGTH ) == 0 )
\r
1235 eDriverState = eSENDING_EVEN_DESCRIPTOR;
\r
1239 /* Here we assume that the previous message has been sent. THERE IS NO
\r
1240 BUFFER OVERFLOW PROTECTION HERE.
\r
1242 Copy the data to send into the buffer as we cannot send it all at once
\r
1243 (if it is greater than 8 bytes in length). */
\r
1244 memcpy( pxCharsForTx.ucTxBuffer, pucData, ulLengthToSend );
\r
1246 /* Reinitialise the buffer index so we start sending from the start of
\r
1248 pxCharsForTx.ulTotalDataLength = ulLengthToSend;
\r
1249 pxCharsForTx.ulNextCharIndex = ( unsigned long ) 0;
\r
1251 /* Send the first 8 bytes now. The rest will get sent in response to
\r
1252 TXCOMP interrupts. */
\r
1253 prvSendNextSegment();
\r
1255 /*-----------------------------------------------------------*/
\r
1257 static void prvSendNextSegment( void )
\r
1259 volatile unsigned long ulNextLength, ulStatus, ulLengthLeftToSend;
\r
1261 /* Is there any data to send? */
\r
1262 if( pxCharsForTx.ulTotalDataLength > pxCharsForTx.ulNextCharIndex )
\r
1264 ulLengthLeftToSend = pxCharsForTx.ulTotalDataLength - pxCharsForTx.ulNextCharIndex;
\r
1266 /* We can only send 8 bytes to the fifo at a time. */
\r
1267 if( ulLengthLeftToSend > usbFIFO_LENGTH )
\r
1269 ulNextLength = usbFIFO_LENGTH;
\r
1273 ulNextLength = ulLengthLeftToSend;
\r
1276 /* Wait until we can place data in the fifo. THERE IS NO TIMEOUT
\r
1278 while( AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] & AT91C_UDP_TXPKTRDY )
\r
1280 vTaskDelay( usbSHORTEST_DELAY );
\r
1283 /* Write the data to the FIFO. */
\r
1284 while( ulNextLength > ( unsigned long ) 0 )
\r
1286 AT91C_BASE_UDP->UDP_FDR[ usbEND_POINT_0 ] = pxCharsForTx.ucTxBuffer[ pxCharsForTx.ulNextCharIndex ];
\r
1289 pxCharsForTx.ulNextCharIndex++;
\r
1292 /* Start the transmission. */
\r
1293 portENTER_CRITICAL();
\r
1295 ulStatus = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ];
\r
1296 usbCSR_SET_BIT( &ulStatus, ( ( unsigned long ) 0x10 ) );
\r
1297 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] = ulStatus;
\r
1299 portEXIT_CRITICAL();
\r
1303 /* There is no data to send. If we were sending a descriptor and the
\r
1304 descriptor was an exact multiple of the max packet size then we need
\r
1305 to send a null to terminate the transmission. */
\r
1306 if( eDriverState == eSENDING_EVEN_DESCRIPTOR )
\r
1308 prvUSBTransmitNull();
\r
1309 eDriverState = eNOTHING;
\r