2 FreeRTOS V9.0.0rc1 - Copyright (C) 2016 Real Time Engineers Ltd.
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5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 This file is part of the FreeRTOS distribution.
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9 FreeRTOS is free software; you can redistribute it and/or modify it under
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10 the terms of the GNU General Public License (version 2) as published by the
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11 Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception.
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13 ***************************************************************************
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14 >>! NOTE: The modification to the GPL is included to allow you to !<<
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15 >>! distribute a combined work that includes FreeRTOS without being !<<
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16 >>! obliged to provide the source code for proprietary components !<<
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17 >>! outside of the FreeRTOS kernel. !<<
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18 ***************************************************************************
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20 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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21 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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22 FOR A PARTICULAR PURPOSE. Full license text is available on the following
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23 link: http://www.freertos.org/a00114.html
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25 ***************************************************************************
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27 * FreeRTOS provides completely free yet professionally developed, *
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28 * robust, strictly quality controlled, supported, and cross *
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29 * platform software that is more than just the market leader, it *
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30 * is the industry's de facto standard. *
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32 * Help yourself get started quickly while simultaneously helping *
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33 * to support the FreeRTOS project by purchasing a FreeRTOS *
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34 * tutorial book, reference manual, or both: *
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35 * http://www.FreeRTOS.org/Documentation *
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37 ***************************************************************************
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39 http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
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40 the FAQ page "My application does not run, what could be wrong?". Have you
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41 defined configASSERT()?
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43 http://www.FreeRTOS.org/support - In return for receiving this top quality
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44 embedded software for free we request you assist our global community by
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45 participating in the support forum.
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47 http://www.FreeRTOS.org/training - Investing in training allows your team to
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48 be as productive as possible as early as possible. Now you can receive
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49 FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
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50 Ltd, and the world's leading authority on the world's leading RTOS.
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52 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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53 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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54 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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56 http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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57 Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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59 http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
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60 Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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61 licenses offer ticketed support, indemnification and commercial middleware.
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63 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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64 engineered and independently SIL3 certified version for use in safety and
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65 mission critical applications that require provable dependability.
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71 Sample interrupt driven USB device driver. This is a minimal implementation
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72 for demonstration only. Although functional, it is not a full and compliant
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75 The USB device enumerates as a simple 3 axis joystick, and once configured
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76 transmits 3 axis of data which can be viewed from the USB host machine.
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78 This file implements the USB interrupt service routine, and a demo FreeRTOS
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79 task. The interrupt service routine handles the USB hardware - taking a
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80 snapshot of the USB status at the point of the interrupt. The task receives
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81 the status information from the interrupt for processing at the task level.
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83 See the FreeRTOS.org WEB documentation for more information.
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89 + Descriptors that have a length that is an exact multiple of usbFIFO_LENGTH
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90 can now be transmitted. To this end an extra parameter has been
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91 added to the prvSendControlData() function, and the state
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92 eSENDING_EVEN_DESCRIPTOR has been introduced. Thanks to Scott Miller for
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93 assisting with this contribution.
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97 + Replaced the duplicated RX_DATA_BK0 in the interrupt mask with the
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101 /* Standard includes. */
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102 #include <string.h>
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104 /* Demo board includes. */
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107 /* Scheduler includes. */
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108 #include "FreeRTOS.h"
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113 /* Descriptor type definitions. */
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114 #define usbDESCRIPTOR_TYPE_DEVICE ( 0x01 )
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115 #define usbDESCRIPTOR_TYPE_CONFIGURATION ( 0x02 )
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116 #define usbDESCRIPTOR_TYPE_STRING ( 0x03 )
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118 /* USB request type definitions. */
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119 #define usbGET_REPORT_REQUEST ( 0x01 )
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120 #define usbGET_IDLE_REQUEST ( 0x02 )
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121 #define usbGET_PROTOCOL_REQUEST ( 0x03 )
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122 #define usbSET_REPORT_REQUEST ( 0x09 )
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123 #define usbSET_IDLE_REQUEST ( 0x0A )
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124 #define usbSET_PROTOCOL_REQUEST ( 0x0B )
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125 #define usbGET_CONFIGURATION_REQUEST ( 0x08 )
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126 #define usbGET_STATUS_REQUEST ( 0x00 )
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127 #define usbCLEAR_FEATURE_REQUEST ( 0x01 )
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128 #define usbSET_FEATURE_REQUEST ( 0x03 )
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129 #define usbSET_ADDRESS_REQUEST ( 0x05 )
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130 #define usbGET_DESCRIPTOR_REQUEST ( 0x06 )
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131 #define usbSET_CONFIGURATION_REQUEST ( 0x09 )
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132 #define usbGET_INTERFACE_REQUEST ( 0x0A )
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133 #define usbSET_INTERFACE_REQUEST ( 0x0B )
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136 /* Misc USB definitions. */
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137 #define usbDEVICE_CLASS_VENDOR_SPECIFIC ( 0xFF )
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138 #define usbBUS_POWERED ( 0x80 )
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139 #define usbHID_REPORT_DESCRIPTOR ( 0x22 )
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140 #define AT91C_UDP_TRANSCEIVER_ENABLE ( *( ( unsigned long * ) 0xfffb0074 ) )
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142 /* Index to the various string. */
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143 #define usbLANGUAGE_STRING ( 0 )
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144 #define usbMANUFACTURER_STRING ( 1 )
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145 #define usbPRODUCT_STRING ( 2 )
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146 #define usbCONFIGURATION_STRING ( 3 )
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147 #define usbINTERFACE_STRING ( 4 )
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149 /* Data indexes for reading the request from the xISRStatus.ucFifoData[]
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150 into xUSB_REQUEST. The data order is designed for speed - so looks a
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152 #define usbREQUEST_TYPE_INDEX ( 7 )
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153 #define usbREQUEST_INDEX ( 6 )
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154 #define usbVALUE_HIGH_BYTE ( 4 )
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155 #define usbVALUE_LOW_BYTE ( 5 )
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156 #define usbINDEX_HIGH_BYTE ( 2 )
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157 #define usbINDEX_LOW_BYTE ( 3 )
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158 #define usbLENGTH_HIGH_BYTE ( 0 )
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159 #define usbLENGTH_LOW_BYTE ( 1 )
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161 /* Misc application definitions. */
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162 #define usbINTERRUPT_PRIORITY ( 3 )
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163 #define usbQUEUE_LENGTH ( 0x3 ) /* Must have all bits set! */
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164 #define usbFIFO_LENGTH ( ( unsigned long ) 8 )
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165 #define usbEND_POINT_0 ( 0 )
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166 #define usbEND_POINT_1 ( 1 )
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167 #define usbXUP ( 1 )
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168 #define usbXDOWN ( 2 )
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169 #define usbYUP ( 3 )
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170 #define usbYDOWN ( 4 )
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171 #define usbMAX_COORD ( 120 )
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172 #define usbMAX_TX_MESSAGE_SIZE ( 128 )
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173 #define usbRX_COUNT_MASK ( ( unsigned long ) 0x7ff )
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174 #define AT91C_UDP_STALLSENT AT91C_UDP_ISOERROR
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175 #define usbSHORTEST_DELAY ( ( TickType_t ) 1 )
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176 #define usbINIT_DELAY ( ( TickType_t ) 500 / portTICK_PERIOD_MS )
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177 #define usbSHORT_DELAY ( ( TickType_t ) 50 / portTICK_PERIOD_MS )
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178 #define usbEND_POINT_RESET_MASK ( ( unsigned long ) 0x0f )
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179 #define usbDATA_INC ( ( char ) 5 )
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180 #define usbEXPECTED_NUMBER_OF_BYTES ( ( unsigned long ) 8 )
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182 /* Control request types. */
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183 #define usbSTANDARD_DEVICE_REQUEST ( 0 )
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184 #define usbSTANDARD_INTERFACE_REQUEST ( 1 )
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185 #define usbSTANDARD_END_POINT_REQUEST ( 2 )
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186 #define usbCLASS_INTERFACE_REQUEST ( 5 )
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188 /*-----------------------------------------------------------*/
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190 /* Structure used to take a snapshot of the USB status from within the ISR. */
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191 typedef struct X_ISR_STATUS
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193 unsigned long ulISR;
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194 unsigned long ulCSR0;
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195 unsigned char ucFifoData[ 8 ];
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198 /* Structure used to hold the received requests. */
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201 unsigned char ucReqType;
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202 unsigned char ucRequest;
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203 unsigned short usValue;
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204 unsigned short usIndex;
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205 unsigned short usLength;
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214 eSENDING_EVEN_DESCRIPTOR,
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218 /* Structure used to control the data being sent to the host. */
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221 unsigned char ucTxBuffer[ usbMAX_TX_MESSAGE_SIZE ];
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222 unsigned long ulNextCharIndex;
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223 unsigned long ulTotalDataLength;
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226 /*-----------------------------------------------------------*/
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229 * The USB interrupt service routine. This takes a snapshot of the USB
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230 * device at the time of the interrupt, clears the interrupts, and posts
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231 * the data to the USB processing task.
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233 __arm void vUSB_ISR( void );
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236 * Called after the bus reset interrupt - this function readies all the
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237 * end points for communication.
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239 static void prvResetEndPoints( void );
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242 * Setup the USB hardware, install the interrupt service routine and
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243 * initialise all the state variables.
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245 static void vInitUSBInterface( void );
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248 * Decode and act upon an interrupt generated by the control end point.
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250 static void prvProcessEndPoint0Interrupt( xISRStatus *pxMessage );
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253 * For simplicity requests are separated into device, interface, class
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254 * interface and end point requests.
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256 * Decode and handle standard device requests originating on the control
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259 static void prvHandleStandardDeviceRequest( xUSB_REQUEST *pxRequest );
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262 * For simplicity requests are separated into device, interface, class
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263 * interface and end point requests.
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265 * Decode and handle standard interface requests originating on the control
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268 static void prvHandleStandardInterfaceRequest( xUSB_REQUEST *pxRequest );
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271 * For simplicity requests are separated into device, interface, class
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272 * interface and end point requests.
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274 * Decode and handle standard end point requests originating on the control
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277 static void prvHandleStandardEndPointRequest( xUSB_REQUEST *pxRequest );
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280 * For simplicity requests are separated into device, interface, class
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281 * interface and end point requests.
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283 * Decode and handle the class interface requests.
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285 static void prvHandleClassInterfaceRequest( xUSB_REQUEST *pxRequest );
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288 * Setup the Tx buffer to send data in response to a control request.
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290 * The data to be transmitted is buffered, the state variables are updated,
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291 * then prvSendNextSegment() is called to start the transmission off. Once
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292 * the first segment has been sent the remaining segments are transmitted
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293 * in response to TXCOMP interrupts until the entire buffer has been
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296 static void prvSendControlData( unsigned char *pucData, unsigned short usRequestedLength, unsigned long ulLengthLeftToSend, long lSendingDescriptor );
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299 * Examine the Tx buffer to see if there is any more data to be transmitted.
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301 * If there is data to be transmitted then send the next segment. A segment
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302 * can have a maximum of 8 bytes (this is defined as the maximum for the end
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303 * point by the descriptor). The final segment may be less than 8 bytes if
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304 * the total data length was not an exact multiple of 8.
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306 static void prvSendNextSegment( void );
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309 * A stall condition is forced each time the host makes a request that is not
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310 * supported by this minimal implementation.
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312 * A stall is forced by setting the appropriate bit in the end points control
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313 * and status register.
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315 static void prvSendStall( void );
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318 * A NULL (or zero length packet) is transmitted in acknowledge the reception
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319 * of certain events from the host.
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321 static void prvUSBTransmitNull( void );
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324 * When the host requests a descriptor this function is called to determine
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325 * which descriptor is being requested and start its transmission.
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327 static void prvGetStandardInterfaceDescriptor( xUSB_REQUEST *pxRequest );
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330 * This demo USB device enumerates as a simple 3 axis joystick. Once
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331 * configured this function is periodically called to generate some sample
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334 * The x and y axis are made to move in a square. The z axis is made to
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335 * repeatedly increment up to its maximum.
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337 static void prvTransmitSampleValues( void );
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340 * The created task to handle the USB demo functionality.
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342 void vUSBDemoTask( void *pvParameters );
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344 /*-----------------------------------------------------------*/
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347 - DESCRIPTOR DEFINITIONS -
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350 /* String descriptors used during the enumeration process.
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351 These take the form:
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354 Length of descriptor,
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359 const char pxLanguageStringDescriptor[] =
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362 usbDESCRIPTOR_TYPE_STRING,
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366 const char pxManufacturerStringDescriptor[] =
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369 usbDESCRIPTOR_TYPE_STRING,
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381 const char pxProductStringDescriptor[] =
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384 usbDESCRIPTOR_TYPE_STRING,
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409 const char pxConfigurationStringDescriptor[] =
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412 usbDESCRIPTOR_TYPE_STRING,
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434 const char pxInterfaceStringDescriptor[] =
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437 usbDESCRIPTOR_TYPE_STRING,
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455 /* Enumeration descriptors. */
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456 const char pxReportDescriptor[] =
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458 0x05, 0x01, /* USAGE_PAGE (Generic Desktop) */
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459 0x09, 0x04, /* USAGE (Joystick) */
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460 0xa1, 0x01, /* COLLECTION (Application) */
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461 0x05, 0x01, /* USAGE_PAGE (Generic Desktop) */
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462 0x09, 0x01, /* USAGE (Pointer) */
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463 0xa1, 0x00, /* COLLECTION (Physical) */
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464 0x09, 0x30, /* USAGE (X) */
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465 0x09, 0x31, /* USAGE (Y) */
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466 0x09, 0x32, /* USAGE (Z) */
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467 0x15, 0x81, /* LOGICAL_MINIMUM (-127) */
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468 0x25, 0x7f, /* LOGICAL_MAXIMUM (127) */
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469 0x75, 0x08, /* REPORT_SIZE (8) */
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470 0x95, 0x03, /* REPORT_COUNT (3) */
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471 0x81, 0x02, /* INPUT (Data,Var,Abs) */
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472 0xc0, /* END_COLLECTION */
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473 0xc0 /* END_COLLECTION */
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476 const char pxDeviceDescriptor[] =
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478 /* Device descriptor */
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479 0x12, /* bLength */
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480 0x01, /* bDescriptorType */
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481 0x10, 0x01, /* bcdUSBL */
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482 usbDEVICE_CLASS_VENDOR_SPECIFIC, /* bDeviceClass: */
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483 0x00, /* bDeviceSubclass: */
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484 0x00, /* bDeviceProtocol: */
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485 0x08, /* bMaxPacketSize0 */
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486 0xFF, 0xFF, /* idVendorL */
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487 0x01, 0x00, /* idProductL */
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488 0x00, 0x01, /* bcdDeviceL */
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489 usbMANUFACTURER_STRING, /* iManufacturer */
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490 usbPRODUCT_STRING, /* iProduct */
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491 0x00, /* SerialNumber */
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492 0x01 /* bNumConfigs */
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495 const char pxConfigDescriptor[] = {
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496 /* Configuration 1 descriptor */
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497 0x09, /* CbLength */
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498 0x02, /* CbDescriptorType */
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499 0x22, 0x00, /* CwTotalLength 2 EP + Control */
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500 0x01, /* CbNumInterfaces */
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501 0x01, /* CbConfigurationValue */
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502 usbCONFIGURATION_STRING,/* CiConfiguration */
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503 usbBUS_POWERED, /* CbmAttributes Bus powered + Remote Wakeup*/
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504 0x32, /* CMaxPower: 100mA */
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506 /* Joystick Interface Descriptor Requirement */
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507 0x09, /* bLength */
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508 0x04, /* bDescriptorType */
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509 0x00, /* bInterfaceNumber */
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510 0x00, /* bAlternateSetting */
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511 0x01, /* bNumEndpoints */
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512 0x03, /* bInterfaceClass: HID code */
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513 0x00, /* bInterfaceSubclass */
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514 0x00, /* bInterfaceProtocol */
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515 usbINTERFACE_STRING,/* iInterface */
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517 /* HID Descriptor */
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518 0x09, /* bLength */
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519 0x21, /* bDescriptor type: HID Descriptor Type */
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520 0x00, 0x01, /* bcdHID */
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521 0x00, /* bCountryCode */
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522 0x01, /* bNumDescriptors */
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523 usbHID_REPORT_DESCRIPTOR, /* bDescriptorType */
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524 sizeof( pxReportDescriptor ), 0x00, /* wItemLength */
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526 /* Endpoint 1 descriptor */
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527 0x07, /* bLength */
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528 0x05, /* bDescriptorType */
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529 0x81, /* bEndpointAddress, Endpoint 01 - IN */
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530 0x03, /* bmAttributes INT */
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531 0x03, 0x00, /* wMaxPacketSize: 3 bytes (x, y, z) */
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532 0x0A /* bInterval */
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535 /*-----------------------------------------------------------*/
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537 /* File scope state variables. */
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538 static unsigned char ucUSBConfig = ( unsigned char ) 0;
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539 static unsigned long ulReceivedAddress = ( unsigned long ) 0;
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540 static eDRIVER_STATE eDriverState = eNOTHING;
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542 /* Array in which the USB interrupt status is passed between the ISR and task. */
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543 static xISRStatus xISRMessages[ usbQUEUE_LENGTH + 1 ];
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545 /* Structure used to control the characters being sent to the host. */
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546 static xTX_MESSAGE pxCharsForTx;
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548 /* Queue used to pass messages between the ISR and the task. */
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549 static QueueHandle_t xUSBInterruptQueue;
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551 /* ISR entry has to be written in the asm file as we want a context switch
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552 to occur from within the ISR. See the port documentation on the FreeRTOS.org
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553 WEB site for more information. */
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554 extern void vUSBISREntry( void );
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556 /*-----------------------------------------------------------*/
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558 /* Macros to manipulate the control and status registers. These registers
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559 cannot be accessed using a direct read modify write operation outside of the
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560 ISR as some bits are left unchanged by writing with a 0, and some are left
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561 unchanged by writing with a 1. */
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563 #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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565 #define usbCSR_SET_BIT( pulValueNow, ulBit ) \
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567 /* Set TXCOMP, RX_DATA_BK0, RXSETUP, */ \
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568 /* STALLSENT and RX_DATA_BK1 to 1 so the */ \
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569 /* write has no effect. */ \
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570 ( * ( ( unsigned long * ) pulValueNow ) ) |= ( unsigned long ) 0x4f; \
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572 /* Clear the FORCE_STALL and TXPKTRDY bits */ \
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573 /* so the write has no effect. */ \
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574 ( * ( ( unsigned long * ) pulValueNow ) ) &= ( unsigned long ) 0xffffffcf; \
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576 /* Set whichever bit we want set. */ \
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577 ( * ( ( unsigned long * ) pulValueNow ) ) |= ( ulBit ); \
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580 #define usbCSR_CLEAR_BIT( pulValueNow, ulBit ) \
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582 /* Set TXCOMP, RX_DATA_BK0, RXSETUP, */ \
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583 /* STALLSENT and RX_DATA_BK1 to 1 so the */ \
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584 /* write has no effect. */ \
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585 ( * ( ( unsigned long * ) pulValueNow ) ) |= ( unsigned long ) 0x4f; \
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587 /* Clear the FORCE_STALL and TXPKTRDY bits */ \
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588 /* so the write has no effect. */ \
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589 ( * ( ( unsigned long * ) pulValueNow ) ) &= ( unsigned long ) 0xffffffcf; \
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591 /* Clear whichever bit we want clear. */ \
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592 ( * ( ( unsigned long * ) pulValueNow ) ) &= ( ~ulBit ); \
\r
595 /*-----------------------------------------------------------*/
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597 __arm void vUSB_ISR( void )
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599 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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600 static volatile unsigned long ulNextMessage = 0;
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601 xISRStatus *pxMessage;
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602 unsigned long ulTemp, ulRxBytes;
\r
604 /* Take the next message from the queue. Note that usbQUEUE_LENGTH *must*
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605 be all 1's, as in 0x01, 0x03, 0x07, etc. */
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606 pxMessage = &( xISRMessages[ ( ulNextMessage & usbQUEUE_LENGTH ) ] );
\r
609 /* Take a snapshot of the current USB state for processing at the task
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611 pxMessage->ulISR = AT91C_BASE_UDP->UDP_ISR;
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612 pxMessage->ulCSR0 = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ];
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614 /* Clear the interrupts from the ICR register. The bus end interrupt is
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615 cleared separately as it does not appear in the mask register. */
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616 AT91C_BASE_UDP->UDP_ICR = AT91C_BASE_UDP->UDP_IMR | AT91C_UDP_ENDBUSRES;
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618 /* If there are bytes in the FIFO then we have to retrieve them here.
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619 Ideally this would be done at the task level. However we need to clear the
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620 RXSETUP interrupt before leaving the ISR, and this may cause the data in
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621 the FIFO to be overwritten. Also the DIR bit has to be changed before the
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622 RXSETUP bit is cleared (as per the SAM7 manual). */
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623 ulTemp = pxMessage->ulCSR0;
\r
625 /* Are there any bytes in the FIFO? */
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626 ulRxBytes = ulTemp >> 16;
\r
627 ulRxBytes &= usbRX_COUNT_MASK;
\r
629 /* With this minimal implementation we are only interested in receiving
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630 setup bytes on the control end point. */
\r
631 if( ( ulRxBytes > 0 ) && ( ulTemp & AT91C_UDP_RXSETUP ) )
\r
633 /* Take off 1 for a zero based index. */
\r
634 while( ulRxBytes > 0 )
\r
637 pxMessage->ucFifoData[ ulRxBytes ] = AT91C_BASE_UDP->UDP_FDR[ usbEND_POINT_0 ];
\r
640 /* The direction must be changed first. */
\r
641 usbCSR_SET_BIT( &ulTemp, ( AT91C_UDP_DIR ) );
\r
642 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] = ulTemp;
\r
645 /* Must write zero's to TXCOMP, STALLSENT, RXSETUP, and the RX DATA
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646 registers to clear the interrupts in the CSR register. */
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647 usbCSR_CLEAR_BIT( &ulTemp, usbINT_CLEAR_MASK );
\r
648 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] = ulTemp;
\r
650 /* Also clear the interrupts in the CSR1 register. */
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651 ulTemp = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ];
\r
652 usbCSR_CLEAR_BIT( &ulTemp, usbINT_CLEAR_MASK );
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653 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ] = ulTemp;
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655 /* The message now contains the entire state and optional data from
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656 the USB interrupt. This can now be posted on the Rx queue ready for
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657 processing at the task level. */
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658 xQueueSendFromISR( xUSBInterruptQueue, &pxMessage, &xHigherPriorityTaskWoken );
\r
660 /* We may want to switch to the USB task, if this message has made
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661 it the highest priority task that is ready to execute. */
\r
662 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
\r
664 /* Clear the AIC ready for the next interrupt. */
\r
665 AT91C_BASE_AIC->AIC_EOICR = 0;
\r
667 /*-----------------------------------------------------------*/
\r
669 void vUSBDemoTask( void *pvParameters )
\r
671 xISRStatus *pxMessage;
\r
673 /* The parameters are not used in this task. */
\r
674 ( void ) pvParameters;
\r
676 /* Init USB device */
\r
677 portENTER_CRITICAL();
\r
678 vInitUSBInterface();
\r
679 portEXIT_CRITICAL();
\r
681 /* Process interrupts as they arrive. The ISR takes a snapshot of the
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682 interrupt status then posts the information on this queue for processing
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683 at the task level. This simple demo implementation only processes
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684 a few interrupt sources. */
\r
687 if( xQueueReceive( xUSBInterruptQueue, &pxMessage, usbSHORT_DELAY ) )
\r
689 if( pxMessage->ulISR & AT91C_UDP_EPINT0 )
\r
691 /* Process end point 0 interrupt. */
\r
692 prvProcessEndPoint0Interrupt( pxMessage );
\r
695 if( pxMessage->ulISR & AT91C_UDP_ENDBUSRES )
\r
697 /* Process an end of bus reset interrupt. */
\r
698 prvResetEndPoints();
\r
703 /* The ISR did not post any data for us to process on the queue, so
\r
704 just generate and send some sample data. */
\r
705 if( eDriverState == eREADY_TO_SEND )
\r
707 prvTransmitSampleValues();
\r
712 /*-----------------------------------------------------------*/
\r
714 static void prvTransmitSampleValues( void )
\r
716 unsigned long ulStatus;
\r
717 static long lState = usbXUP;
\r
719 /* Variables to hold dummy x, y and z joystick axis data. */
\r
720 static signed char x = 0, y = 0, z = 0;
\r
722 /* Generate some sample data in the x and y axis - draw a square. */
\r
725 case usbXUP : x += usbDATA_INC;
\r
726 if( x >= usbMAX_COORD )
\r
732 case usbXDOWN : x -= usbDATA_INC;
\r
733 if( x <= -usbMAX_COORD )
\r
739 case usbYUP : y += usbDATA_INC;
\r
740 if( y >= usbMAX_COORD )
\r
746 case usbYDOWN : y -= usbDATA_INC;
\r
747 if( y <= -usbMAX_COORD )
\r
754 /* Just make the z axis go up and down. */
\r
757 /* Can we place data in the fifo? */
\r
758 if( !( AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ] & AT91C_UDP_TXPKTRDY ) )
\r
760 /* Write our sample data to the fifo. */
\r
761 AT91C_BASE_UDP->UDP_FDR[ usbEND_POINT_1 ] = x;
\r
762 AT91C_BASE_UDP->UDP_FDR[ usbEND_POINT_1 ] = y;
\r
763 AT91C_BASE_UDP->UDP_FDR[ usbEND_POINT_1 ] = z;
\r
765 /* Send the data. */
\r
766 portENTER_CRITICAL();
\r
768 ulStatus = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ];
\r
769 usbCSR_SET_BIT( &ulStatus, ( AT91C_UDP_TXPKTRDY ) );
\r
770 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ] = ulStatus;
\r
772 portEXIT_CRITICAL();
\r
775 /*-----------------------------------------------------------*/
\r
777 static void prvUSBTransmitNull( void )
\r
779 unsigned long ulStatus;
\r
781 /* Wait until the FIFO is free - even though we are not going to use it.
\r
782 THERE IS NO TIMEOUT HERE! */
\r
783 while( AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] & AT91C_UDP_TXPKTRDY )
\r
785 vTaskDelay( usbSHORTEST_DELAY );
\r
788 portENTER_CRITICAL();
\r
790 /* Set the length of data to send to equal the index of the next byte
\r
791 to send. This will prevent the ACK to this NULL packet causing any
\r
792 further data transmissions. */
\r
793 pxCharsForTx.ulTotalDataLength = pxCharsForTx.ulNextCharIndex;
\r
795 /* Set the TXPKTRDY bit to cause a transmission with no data. */
\r
796 ulStatus = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ];
\r
797 usbCSR_SET_BIT( &ulStatus, ( AT91C_UDP_TXPKTRDY ) );
\r
798 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] = ulStatus;
\r
800 portEXIT_CRITICAL();
\r
802 /*-----------------------------------------------------------*/
\r
804 static void prvSendStall( void )
\r
806 unsigned long ulStatus;
\r
808 portENTER_CRITICAL();
\r
810 /* Force a stall by simply setting the FORCESTALL bit in the CSR. */
\r
811 ulStatus = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ];
\r
812 usbCSR_SET_BIT( &ulStatus, AT91C_UDP_FORCESTALL );
\r
813 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] = ulStatus;
\r
815 portEXIT_CRITICAL();
\r
817 /*-----------------------------------------------------------*/
\r
819 static void prvResetEndPoints( void )
\r
821 unsigned long ulTemp;
\r
823 eDriverState = eJUST_RESET;
\r
825 /* Reset all the end points. */
\r
826 AT91C_BASE_UDP->UDP_RSTEP = usbEND_POINT_RESET_MASK;
\r
827 AT91C_BASE_UDP->UDP_RSTEP = ( unsigned long ) 0x00;
\r
829 /* Enable data to be sent and received. */
\r
830 AT91C_BASE_UDP->UDP_FADDR = AT91C_UDP_FEN;
\r
832 /* Repair the configuration end point. */
\r
833 portENTER_CRITICAL();
\r
835 ulTemp = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ];
\r
836 usbCSR_SET_BIT( &ulTemp, ( ( unsigned long ) ( AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_CTRL ) ) );
\r
837 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] = ulTemp;
\r
838 AT91F_UDP_EnableIt( AT91C_BASE_UDP, AT91C_UDP_EPINT0 );
\r
840 portEXIT_CRITICAL();
\r
842 /*-----------------------------------------------------------*/
\r
844 static void prvProcessEndPoint0Interrupt( xISRStatus *pxMessage )
\r
846 if( pxMessage->ulCSR0 & AT91C_UDP_RX_DATA_BK0 )
\r
848 /* We only expect to receive zero length data here as ACK's.
\r
849 Set the data pointer to the end of the current Tx packet to
\r
850 ensure we don't send out any more data. */
\r
851 pxCharsForTx.ulNextCharIndex = pxCharsForTx.ulTotalDataLength;
\r
854 if( pxMessage->ulCSR0 & AT91C_UDP_TXCOMP )
\r
856 /* We received a TX complete interrupt. What we do depends on
\r
857 what we sent to get this interrupt. */
\r
859 if( eDriverState == eJUST_GOT_CONFIG )
\r
861 /* We sent an acknowledgement of a SET_CONFIG request. We
\r
862 are now at the end of the enumeration. */
\r
863 AT91C_BASE_UDP->UDP_GLBSTATE = AT91C_UDP_CONFG;
\r
865 /* Read the end point for data transfer. */
\r
866 portENTER_CRITICAL();
\r
868 unsigned long ulTemp;
\r
870 ulTemp = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ];
\r
871 usbCSR_SET_BIT( &ulTemp, AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_INT_IN );
\r
872 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ] = ulTemp;
\r
873 AT91F_UDP_EnableIt( AT91C_BASE_UDP, AT91C_UDP_EPINT1 );
\r
875 portEXIT_CRITICAL();
\r
877 eDriverState = eREADY_TO_SEND;
\r
879 else if( eDriverState == eJUST_GOT_ADDRESS )
\r
881 /* We sent an acknowledgement of a SET_ADDRESS request. Move
\r
882 to the addressed state. */
\r
883 if( ulReceivedAddress != ( unsigned long ) 0 )
\r
885 AT91C_BASE_UDP->UDP_GLBSTATE = AT91C_UDP_FADDEN;
\r
889 AT91C_BASE_UDP->UDP_GLBSTATE = 0;
\r
892 AT91C_BASE_UDP->UDP_FADDR = ( AT91C_UDP_FEN | ulReceivedAddress );
\r
893 eDriverState = eNOTHING;
\r
897 /* The TXCOMP was not for any special type of transmission. See
\r
898 if there is any more data to send. */
\r
899 prvSendNextSegment();
\r
903 if( pxMessage->ulCSR0 & AT91C_UDP_RXSETUP )
\r
905 xUSB_REQUEST xRequest;
\r
906 unsigned char ucRequest;
\r
907 unsigned long ulRxBytes;
\r
909 /* A data packet is available. */
\r
910 ulRxBytes = pxMessage->ulCSR0 >> 16;
\r
911 ulRxBytes &= usbRX_COUNT_MASK;
\r
913 if( ulRxBytes >= usbEXPECTED_NUMBER_OF_BYTES )
\r
915 /* Create an xUSB_REQUEST variable from the raw bytes array. */
\r
917 xRequest.ucReqType = pxMessage->ucFifoData[ usbREQUEST_TYPE_INDEX ];
\r
918 xRequest.ucRequest = pxMessage->ucFifoData[ usbREQUEST_INDEX ];
\r
920 /* NOT PORTABLE CODE! */
\r
921 xRequest.usValue = pxMessage->ucFifoData[ usbVALUE_HIGH_BYTE ];
\r
922 xRequest.usValue <<= 8;
\r
923 xRequest.usValue |= pxMessage->ucFifoData[ usbVALUE_LOW_BYTE ];
\r
925 xRequest.usIndex = pxMessage->ucFifoData[ usbINDEX_HIGH_BYTE ];
\r
926 xRequest.usIndex <<= 8;
\r
927 xRequest.usIndex |= pxMessage->ucFifoData[ usbINDEX_LOW_BYTE ];
\r
929 xRequest.usLength = pxMessage->ucFifoData[ usbLENGTH_HIGH_BYTE ];
\r
930 xRequest.usLength <<= 8;
\r
931 xRequest.usLength |= pxMessage->ucFifoData[ usbLENGTH_LOW_BYTE ];
\r
933 /* Manipulate the ucRequestType and the ucRequest parameters to
\r
934 generate a zero based request selection. This is just done to
\r
935 break up the requests into subsections for clarity. The
\r
936 alternative would be to have more huge switch statement that would
\r
937 be difficult to optimise. */
\r
938 ucRequest = ( ( xRequest.ucReqType & 0x60 ) >> 3 );
\r
939 ucRequest |= ( xRequest.ucReqType & 0x03 );
\r
941 switch( ucRequest )
\r
943 case usbSTANDARD_DEVICE_REQUEST:
\r
944 /* Standard Device request */
\r
945 prvHandleStandardDeviceRequest( &xRequest );
\r
948 case usbSTANDARD_INTERFACE_REQUEST:
\r
949 /* Standard Interface request */
\r
950 prvHandleStandardInterfaceRequest( &xRequest );
\r
953 case usbSTANDARD_END_POINT_REQUEST:
\r
954 /* Standard Endpoint request */
\r
955 prvHandleStandardEndPointRequest( &xRequest );
\r
958 case usbCLASS_INTERFACE_REQUEST:
\r
959 /* Class Interface request */
\r
960 prvHandleClassInterfaceRequest( &xRequest );
\r
963 default: /* This is not something we want to respond to. */
\r
969 /*-----------------------------------------------------------*/
\r
971 static void prvGetStandardDeviceDescriptor( xUSB_REQUEST *pxRequest )
\r
973 /* The type is in the high byte. Return whatever has been requested. */
\r
974 switch( ( pxRequest->usValue & 0xff00 ) >> 8 )
\r
976 case usbDESCRIPTOR_TYPE_DEVICE:
\r
977 prvSendControlData( ( unsigned char * ) &pxDeviceDescriptor, pxRequest->usLength, sizeof( pxDeviceDescriptor ), pdTRUE );
\r
980 case usbDESCRIPTOR_TYPE_CONFIGURATION:
\r
981 prvSendControlData( ( unsigned char * ) &( pxConfigDescriptor ), pxRequest->usLength, sizeof( pxConfigDescriptor ), pdTRUE );
\r
984 case usbDESCRIPTOR_TYPE_STRING:
\r
986 /* The index to the string descriptor is the lower byte. */
\r
987 switch( pxRequest->usValue & 0xff )
\r
989 case usbLANGUAGE_STRING:
\r
990 prvSendControlData( ( unsigned char * ) &pxLanguageStringDescriptor, pxRequest->usLength, sizeof(pxLanguageStringDescriptor), pdTRUE );
\r
993 case usbMANUFACTURER_STRING:
\r
994 prvSendControlData( ( unsigned char * ) &pxManufacturerStringDescriptor, pxRequest->usLength, sizeof( pxManufacturerStringDescriptor ), pdTRUE );
\r
997 case usbPRODUCT_STRING:
\r
998 prvSendControlData( ( unsigned char * ) &pxProductStringDescriptor, pxRequest->usLength, sizeof( pxProductStringDescriptor ), pdTRUE );
\r
1001 case usbCONFIGURATION_STRING:
\r
1002 prvSendControlData( ( unsigned char * ) &pxConfigurationStringDescriptor, pxRequest->usLength, sizeof( pxConfigurationStringDescriptor ), pdTRUE );
\r
1005 case usbINTERFACE_STRING:
\r
1006 prvSendControlData( ( unsigned char * ) &pxInterfaceStringDescriptor, pxRequest->usLength, sizeof( pxInterfaceStringDescriptor ), pdTRUE );
\r
1010 /* Don't know what this string is. */
\r
1018 /* We are not responding to anything else. */
\r
1023 /*-----------------------------------------------------------*/
\r
1025 static void prvHandleStandardDeviceRequest( xUSB_REQUEST *pxRequest )
\r
1027 unsigned short usStatus = 0;
\r
1029 switch( pxRequest->ucRequest )
\r
1031 case usbGET_STATUS_REQUEST:
\r
1032 /* Just send two byte dummy status. */
\r
1033 prvSendControlData( ( unsigned char * ) &usStatus, sizeof( usStatus ), sizeof( usStatus ), pdFALSE );
\r
1036 case usbGET_DESCRIPTOR_REQUEST:
\r
1037 /* Send device descriptor */
\r
1038 prvGetStandardDeviceDescriptor( pxRequest );
\r
1041 case usbGET_CONFIGURATION_REQUEST:
\r
1042 /* Send selected device configuration */
\r
1043 prvSendControlData( ( unsigned char * ) &ucUSBConfig, sizeof( ucUSBConfig ), sizeof( ucUSBConfig ), pdFALSE );
\r
1046 case usbSET_FEATURE_REQUEST:
\r
1047 prvUSBTransmitNull();
\r
1050 case usbSET_ADDRESS_REQUEST:
\r
1052 /* Acknowledge the SET_ADDRESS, but (according to the manual) we
\r
1053 cannot actually move to the addressed state until we get a TXCOMP
\r
1054 interrupt from this NULL packet. Therefore we just remember the
\r
1055 address and set our state so we know we have received the address. */
\r
1056 prvUSBTransmitNull();
\r
1057 eDriverState = eJUST_GOT_ADDRESS;
\r
1058 ulReceivedAddress = ( unsigned long ) pxRequest->usValue;
\r
1061 case usbSET_CONFIGURATION_REQUEST:
\r
1063 /* Acknowledge the SET_CONFIGURATION, but (according to the manual)
\r
1064 we cannot actually move to the configured state until we get a
\r
1065 TXCOMP interrupt from this NULL packet. Therefore we just remember the
\r
1066 config and set our state so we know we have received the go ahead. */
\r
1067 ucUSBConfig = ( unsigned char ) ( pxRequest->usValue & 0xff );
\r
1068 eDriverState = eJUST_GOT_CONFIG;
\r
1069 prvUSBTransmitNull();
\r
1074 /* We don't answer to anything else. */
\r
1079 /*-----------------------------------------------------------*/
\r
1081 static void prvHandleClassInterfaceRequest( xUSB_REQUEST *pxRequest )
\r
1083 switch( pxRequest->ucRequest )
\r
1085 case usbSET_IDLE_REQUEST:
\r
1086 prvUSBTransmitNull();
\r
1089 /* This minimal implementation ignores these. */
\r
1090 case usbGET_REPORT_REQUEST:
\r
1091 case usbGET_IDLE_REQUEST:
\r
1092 case usbGET_PROTOCOL_REQUEST:
\r
1093 case usbSET_REPORT_REQUEST:
\r
1094 case usbSET_PROTOCOL_REQUEST:
\r
1101 /*-----------------------------------------------------------*/
\r
1103 static void prvGetStandardInterfaceDescriptor( xUSB_REQUEST *pxRequest )
\r
1105 switch( ( pxRequest->usValue & ( unsigned short ) 0xff00 ) >> 8 )
\r
1107 case usbHID_REPORT_DESCRIPTOR:
\r
1108 prvSendControlData( ( unsigned char * ) pxReportDescriptor, pxRequest->usLength, sizeof( pxReportDescriptor ), pdTRUE );
\r
1113 /* Don't expect to send any others. */
\r
1118 /*-----------------------------------------------------------*/
\r
1120 static void prvHandleStandardInterfaceRequest( xUSB_REQUEST *pxRequest )
\r
1122 unsigned short usStatus = 0;
\r
1124 switch( pxRequest->ucRequest )
\r
1126 case usbGET_STATUS_REQUEST:
\r
1127 /* Send dummy 2 bytes. */
\r
1128 prvSendControlData( ( unsigned char * ) &usStatus, sizeof( usStatus ), sizeof( usStatus ), pdFALSE );
\r
1131 case usbGET_DESCRIPTOR_REQUEST:
\r
1132 prvGetStandardInterfaceDescriptor( pxRequest );
\r
1135 /* This minimal implementation does not respond to these. */
\r
1136 case usbGET_INTERFACE_REQUEST:
\r
1137 case usbSET_FEATURE_REQUEST:
\r
1138 case usbSET_INTERFACE_REQUEST:
\r
1145 /*-----------------------------------------------------------*/
\r
1147 static void prvHandleStandardEndPointRequest( xUSB_REQUEST *pxRequest )
\r
1149 switch( pxRequest->ucRequest )
\r
1151 /* This minimal implementation does not expect to respond to these. */
\r
1152 case usbGET_STATUS_REQUEST:
\r
1153 case usbCLEAR_FEATURE_REQUEST:
\r
1154 case usbSET_FEATURE_REQUEST:
\r
1161 /*-----------------------------------------------------------*/
\r
1163 static void vInitUSBInterface( void )
\r
1165 volatile unsigned long ulTemp;
\r
1167 /* Create the queue used to communicate between the USB ISR and task. */
\r
1168 xUSBInterruptQueue = xQueueCreate( usbQUEUE_LENGTH + 1, sizeof( xISRStatus * ) );
\r
1170 /* Initialise a few state variables. */
\r
1171 pxCharsForTx.ulNextCharIndex = ( unsigned long ) 0;
\r
1172 ucUSBConfig = ( unsigned char ) 0;
\r
1173 eDriverState = eNOTHING;
\r
1175 /* HARDWARE SETUP */
\r
1177 /* Set the PLL USB Divider */
\r
1178 AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1;
\r
1180 /* Enables the 48MHz USB clock UDPCK and System Peripheral USB Clock. */
\r
1181 AT91C_BASE_PMC->PMC_SCER = AT91C_PMC_UDP;
\r
1182 AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_UDP);
\r
1184 /* Setup the PIO for the USB pull up resistor. */
\r
1185 AT91F_PIO_CfgOutput(AT91C_BASE_PIOA,AT91C_PIO_PA16);
\r
1187 /* Start without the pullup - this will get set at the end of this
\r
1189 AT91F_PIO_SetOutput( AT91C_BASE_PIOA, AT91C_PIO_PA16 );
\r
1191 /* When using the USB debugger the peripheral registers do not always get
\r
1192 set to the correct default values. To make sure set the relevant registers
\r
1194 AT91C_BASE_UDP->UDP_IDR = ( unsigned long ) 0xffffffff;
\r
1195 AT91C_BASE_UDP->UDP_ICR = ( unsigned long ) 0xffffffff;
\r
1196 AT91C_BASE_UDP->UDP_CSR[ 0 ] = ( unsigned long ) 0x00;
\r
1197 AT91C_BASE_UDP->UDP_CSR[ 1 ] = ( unsigned long ) 0x00;
\r
1198 AT91C_BASE_UDP->UDP_GLBSTATE = 0;
\r
1199 AT91C_BASE_UDP->UDP_FADDR = 0;
\r
1201 /* Enable the transceiver. */
\r
1202 AT91C_UDP_TRANSCEIVER_ENABLE = 0;
\r
1204 /* Enable the USB interrupts - other interrupts get enabled as the
\r
1205 enumeration process progresses. */
\r
1206 AT91F_AIC_ConfigureIt( AT91C_BASE_AIC, AT91C_ID_UDP, usbINTERRUPT_PRIORITY, AT91C_AIC_SRCTYPE_INT_LEVEL_SENSITIVE, ( void (*)( void ) ) vUSBISREntry );
\r
1207 AT91F_AIC_EnableIt( AT91C_BASE_AIC, AT91C_ID_UDP );
\r
1209 /* Wait a short while before making our presence known. */
\r
1210 vTaskDelay( usbINIT_DELAY );
\r
1211 AT91F_PIO_ClearOutput(AT91C_BASE_PIOA, AT91C_PIO_PA16 );
\r
1213 /*-----------------------------------------------------------*/
\r
1215 static void prvSendControlData( unsigned char *pucData, unsigned short usRequestedLength, unsigned long ulLengthToSend, long lSendingDescriptor )
\r
1217 if( ( ( unsigned long ) usRequestedLength < ulLengthToSend ) )
\r
1219 /* Cap the data length to that requested. */
\r
1220 ulLengthToSend = ( unsigned short ) usRequestedLength;
\r
1222 else if( ( ulLengthToSend < ( unsigned long ) usRequestedLength ) && lSendingDescriptor )
\r
1224 /* We are sending a descriptor. If the descriptor is an exact
\r
1225 multiple of the FIFO length then it will have to be terminated
\r
1226 with a NULL packet. Set the state to indicate this if
\r
1228 if( ( ulLengthToSend % usbFIFO_LENGTH ) == 0 )
\r
1230 eDriverState = eSENDING_EVEN_DESCRIPTOR;
\r
1234 /* Here we assume that the previous message has been sent. THERE IS NO
\r
1235 BUFFER OVERFLOW PROTECTION HERE.
\r
1237 Copy the data to send into the buffer as we cannot send it all at once
\r
1238 (if it is greater than 8 bytes in length). */
\r
1239 memcpy( pxCharsForTx.ucTxBuffer, pucData, ulLengthToSend );
\r
1241 /* Reinitialise the buffer index so we start sending from the start of
\r
1243 pxCharsForTx.ulTotalDataLength = ulLengthToSend;
\r
1244 pxCharsForTx.ulNextCharIndex = ( unsigned long ) 0;
\r
1246 /* Send the first 8 bytes now. The rest will get sent in response to
\r
1247 TXCOMP interrupts. */
\r
1248 prvSendNextSegment();
\r
1250 /*-----------------------------------------------------------*/
\r
1252 static void prvSendNextSegment( void )
\r
1254 volatile unsigned long ulNextLength, ulStatus, ulLengthLeftToSend;
\r
1256 /* Is there any data to send? */
\r
1257 if( pxCharsForTx.ulTotalDataLength > pxCharsForTx.ulNextCharIndex )
\r
1259 ulLengthLeftToSend = pxCharsForTx.ulTotalDataLength - pxCharsForTx.ulNextCharIndex;
\r
1261 /* We can only send 8 bytes to the fifo at a time. */
\r
1262 if( ulLengthLeftToSend > usbFIFO_LENGTH )
\r
1264 ulNextLength = usbFIFO_LENGTH;
\r
1268 ulNextLength = ulLengthLeftToSend;
\r
1271 /* Wait until we can place data in the fifo. THERE IS NO TIMEOUT
\r
1273 while( AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] & AT91C_UDP_TXPKTRDY )
\r
1275 vTaskDelay( usbSHORTEST_DELAY );
\r
1278 /* Write the data to the FIFO. */
\r
1279 while( ulNextLength > ( unsigned long ) 0 )
\r
1281 AT91C_BASE_UDP->UDP_FDR[ usbEND_POINT_0 ] = pxCharsForTx.ucTxBuffer[ pxCharsForTx.ulNextCharIndex ];
\r
1284 pxCharsForTx.ulNextCharIndex++;
\r
1287 /* Start the transmission. */
\r
1288 portENTER_CRITICAL();
\r
1290 ulStatus = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ];
\r
1291 usbCSR_SET_BIT( &ulStatus, ( ( unsigned long ) 0x10 ) );
\r
1292 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] = ulStatus;
\r
1294 portEXIT_CRITICAL();
\r
1298 /* There is no data to send. If we were sending a descriptor and the
\r
1299 descriptor was an exact multiple of the max packet size then we need
\r
1300 to send a null to terminate the transmission. */
\r
1301 if( eDriverState == eSENDING_EVEN_DESCRIPTOR )
\r
1303 prvUSBTransmitNull();
\r
1304 eDriverState = eNOTHING;
\r