2 * FreeRTOS Kernel V10.3.0
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3 * Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
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6 * this software and associated documentation files (the "Software"), to deal in
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7 * the Software without restriction, including without limitation the rights to
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8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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9 * the Software, and to permit persons to whom the Software is furnished to do so,
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10 * subject to the following conditions:
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12 * The above copyright notice and this permission notice shall be included in all
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13 * copies or substantial portions of the Software.
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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17 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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18 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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19 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 * http://www.FreeRTOS.org
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23 * http://aws.amazon.com/freertos
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25 * 1 tab == 4 spaces!
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29 USB Communications Device Class driver.
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30 Implements task vUSBCDCTask and provides an Abstract Control Model serial
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31 interface. Control is through endpoint 0, device-to-host notification is
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32 provided by interrupt-in endpoint 3, and raw data is transferred through
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33 bulk endpoints 1 and 2.
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35 - developed from original FreeRTOS HID example by Scott Miller
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36 - modified to support 3.2 GCC by najay
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39 /* Standard includes. */
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43 /* Demo board includes. */
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46 /* Scheduler includes. */
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47 #include "FreeRTOS.h"
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51 /* Demo app includes. */
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52 #include "USB-CDC.h"
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53 #include "descriptors.h"
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55 #define usbNO_BLOCK ( ( TickType_t ) 0 )
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57 /* Reset all endpoints */
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58 static void prvResetEndPoints( void );
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60 /* Clear pull up resistor to detach device from host */
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61 static void vDetachUSBInterface( void );
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63 /* Set up interface and initialize variables */
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64 static void vInitUSBInterface( void );
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66 /* Handle control endpoint events. */
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67 static void prvProcessEndPoint0Interrupt( xISRStatus *pxMessage );
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69 /* Handle standard device requests. */
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70 static void prvHandleStandardDeviceRequest( xUSB_REQUEST *pxRequest );
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72 /* Handle standard interface requests. */
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73 static void prvHandleStandardInterfaceRequest( xUSB_REQUEST *pxRequest );
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75 /* Handle endpoint requests. */
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76 static void prvHandleStandardEndPointRequest( xUSB_REQUEST *pxRequest );
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78 /* Handle class interface requests. */
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79 static void prvHandleClassInterfaceRequest( xUSB_REQUEST *pxRequest );
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81 /* Prepare control data transfer. prvSendNextSegment starts transfer. */
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82 static void prvSendControlData( unsigned char *pucData, unsigned short usRequestedLength, unsigned long ulLengthLeftToSend, long lSendingDescriptor );
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84 /* Send next segment of data for the control transfer */
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85 static void prvSendNextSegment( void );
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87 /* Send stall - used to respond to unsupported requests */
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88 static void prvSendStall( void );
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90 /* Send a zero-length (null) packet */
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91 static void prvSendZLP( void );
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93 /* Handle requests for standard interface descriptors */
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94 static void prvGetStandardInterfaceDescriptor( xUSB_REQUEST *pxRequest );
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96 /*------------------------------------------------------------*/
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98 /* File scope static variables */
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99 static unsigned char ucUSBConfig = ( unsigned char ) 0;
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100 static unsigned long ulReceivedAddress = ( unsigned long ) 0;
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101 static eDRIVER_STATE eDriverState = eNOTHING;
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103 /* Incoming and outgoing control data structures */
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104 static xCONTROL_MESSAGE pxControlTx;
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105 static xCONTROL_MESSAGE pxControlRx;
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107 /* Queue holding pointers to pending messages */
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108 QueueHandle_t xUSBInterruptQueue;
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110 /* Queues used to hold received characters, and characters waiting to be
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111 transmitted. Rx queue must be larger than FIFO size. */
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112 static QueueHandle_t xRxCDC;
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113 static QueueHandle_t xTxCDC;
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115 /* Line coding - 115,200 baud, N-8-1 */
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116 static const unsigned char pxLineCoding[] = { 0x00, 0xC2, 0x01, 0x00, 0x00, 0x00, 0x08 };
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118 /* Status variables. */
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119 static unsigned char ucControlState;
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120 static unsigned int uiCurrentBank;
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123 /*------------------------------------------------------------*/
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126 void vUSBCDCTask( void *pvParameters )
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128 xISRStatus *pxMessage;
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129 unsigned long ulStatus;
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130 unsigned long ulRxBytes;
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131 unsigned char ucByte;
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132 portBASE_TYPE xByte;
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134 ( void ) pvParameters;
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136 /* Disconnect USB device from hub. For debugging - causes host to register reset */
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137 portENTER_CRITICAL();
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138 vDetachUSBInterface();
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139 portEXIT_CRITICAL();
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141 vTaskDelay( portTICK_PERIOD_MS * 60 );
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143 /* Init USB interface */
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144 portENTER_CRITICAL();
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145 vInitUSBInterface();
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146 portEXIT_CRITICAL();
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148 /* Main task loop. Process incoming endpoint 0 interrupts, handle data transfers. */
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152 /* Look for data coming from the ISR. */
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153 if( xQueueReceive( xUSBInterruptQueue, &pxMessage, usbSHORTEST_DELAY ) )
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155 if( pxMessage->ulISR & AT91C_UDP_EPINT0 )
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157 /* All endpoint 0 interrupts are handled here. */
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158 prvProcessEndPoint0Interrupt( pxMessage );
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161 if( pxMessage->ulISR & AT91C_UDP_ENDBUSRES )
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163 /* End of bus reset - reset the endpoints and de-configure. */
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164 prvResetEndPoints();
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168 /* See if we're ready to send and receive data. */
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169 if( eDriverState == eREADY_TO_SEND && ucControlState )
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171 if( ( !(AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_2 ] & AT91C_UDP_TXPKTRDY) ) && uxQueueMessagesWaiting( xTxCDC ) )
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173 for( xByte = 0; xByte < 64; xByte++ )
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175 if( !xQueueReceive( xTxCDC, &ucByte, 0 ) )
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177 /* No data buffered to transmit. */
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181 /* Got a byte to transmit. */
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182 AT91C_BASE_UDP->UDP_FDR[ usbEND_POINT_2 ] = ucByte;
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184 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_2 ] |= AT91C_UDP_TXPKTRDY;
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187 /* Check for incoming data (host-to-device) on endpoint 1. */
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188 while( AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ] & (AT91C_UDP_RX_DATA_BK0 | AT91C_UDP_RX_DATA_BK1) )
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190 ulRxBytes = (AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ] >> 16) & usbRX_COUNT_MASK;
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192 /* Only process FIFO if there's room to store it in the queue */
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193 if( ulRxBytes < ( USB_CDC_QUEUE_SIZE - uxQueueMessagesWaiting( xRxCDC ) ) )
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195 while( ulRxBytes-- )
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197 ucByte = AT91C_BASE_UDP->UDP_FDR[ usbEND_POINT_1 ];
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198 xQueueSend( xRxCDC, &ucByte, 0 );
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201 /* Release the FIFO */
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202 portENTER_CRITICAL();
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204 ulStatus = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ];
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205 usbCSR_CLEAR_BIT( &ulStatus, uiCurrentBank );
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206 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ] = ulStatus;
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208 portEXIT_CRITICAL();
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210 /* Re-enable endpoint 1's interrupts */
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211 AT91C_BASE_UDP->UDP_IER = AT91C_UDP_EPINT1;
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213 /* Update the current bank in use */
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214 if( uiCurrentBank == AT91C_UDP_RX_DATA_BK0 )
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216 uiCurrentBank = AT91C_UDP_RX_DATA_BK1;
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220 uiCurrentBank = AT91C_UDP_RX_DATA_BK0;
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232 /*------------------------------------------------------------*/
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234 void vUSBSendByte( char cByte )
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236 /* Queue the byte to be sent. The USB task will send it. */
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237 xQueueSend( xTxCDC, &cByte, usbNO_BLOCK );
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239 /*------------------------------------------------------------*/
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241 static void prvSendZLP( void )
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243 unsigned long ulStatus;
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245 /* Wait until the FIFO is free - even though we are not going to use it.
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246 THERE IS NO TIMEOUT HERE! */
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247 while( AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] & AT91C_UDP_TXPKTRDY )
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249 vTaskDelay( usbSHORTEST_DELAY );
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252 portENTER_CRITICAL();
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254 /* Cancel any further pending data */
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255 pxControlTx.ulTotalDataLength = pxControlTx.ulNextCharIndex;
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257 /* Set the TXPKTRDY bit to cause a transmission with no data. */
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258 ulStatus = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ];
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259 usbCSR_SET_BIT( &ulStatus, AT91C_UDP_TXPKTRDY );
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260 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] = ulStatus;
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262 portEXIT_CRITICAL();
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264 /*------------------------------------------------------------*/
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266 static void prvSendStall( void )
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268 unsigned long ulStatus;
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270 portENTER_CRITICAL();
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272 /* Force a stall by simply setting the FORCESTALL bit in the CSR. */
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273 ulStatus = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ];
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274 usbCSR_SET_BIT( &ulStatus, AT91C_UDP_FORCESTALL );
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275 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] = ulStatus;
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277 portEXIT_CRITICAL();
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279 /*------------------------------------------------------------*/
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281 static void prvResetEndPoints( void )
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283 unsigned long ulTemp;
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285 eDriverState = eJUST_RESET;
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286 ucControlState = 0;
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288 /* Reset all the end points. */
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289 AT91C_BASE_UDP->UDP_RSTEP = usbEND_POINT_RESET_MASK;
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290 AT91C_BASE_UDP->UDP_RSTEP = ( unsigned long ) 0x00;
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292 /* Enable data to be sent and received. */
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293 AT91C_BASE_UDP->UDP_FADDR = AT91C_UDP_FEN;
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295 /* Repair the configuration end point. */
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296 portENTER_CRITICAL();
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298 ulTemp = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ];
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299 usbCSR_SET_BIT( &ulTemp, ( ( unsigned long ) ( AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_CTRL ) ) );
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300 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] = ulTemp;
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301 AT91C_BASE_UDP->UDP_IER = AT91C_UDP_EPINT0;
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303 portEXIT_CRITICAL();
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304 uiCurrentBank = AT91C_UDP_RX_DATA_BK0;
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306 /*------------------------------------------------------------*/
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308 static void prvProcessEndPoint0Interrupt( xISRStatus *pxMessage )
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310 static xUSB_REQUEST xRequest;
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311 unsigned long ulRxBytes;
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313 /* Get number of bytes received, if any */
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314 ulRxBytes = pxMessage->ulCSR0 >> 16;
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315 ulRxBytes &= usbRX_COUNT_MASK;
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317 if( pxMessage->ulCSR0 & AT91C_UDP_TXCOMP )
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319 /* We received a TX complete interrupt. What we do depends on
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320 what we sent to get this interrupt. */
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322 if( eDriverState == eJUST_GOT_CONFIG )
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324 /* We sent an acknowledgement of a SET_CONFIG request. We
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325 are now at the end of the enumeration.
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327 TODO: Config 0 sets unconfigured state, should enter Address state.
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328 Request for unsupported config should stall. */
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329 AT91C_BASE_UDP->UDP_GLBSTATE = AT91C_UDP_CONFG;
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331 /* Set up endpoints */
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332 portENTER_CRITICAL();
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334 unsigned long ulTemp;
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336 /* Set endpoint 1 to bulk-out */
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337 ulTemp = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ];
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338 usbCSR_SET_BIT( &ulTemp, AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT );
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339 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_1 ] = ulTemp;
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340 AT91C_BASE_UDP->UDP_IER = AT91C_UDP_EPINT1;
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341 /* Set endpoint 2 to bulk-in */
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342 ulTemp = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_2 ];
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343 usbCSR_SET_BIT( &ulTemp, AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN );
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344 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_2 ] = ulTemp;
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345 AT91C_BASE_UDP->UDP_IER = AT91C_UDP_EPINT2;
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346 /* Set endpoint 3 to interrupt-in, enable it, and enable interrupts */
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347 ulTemp = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_3 ];
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348 usbCSR_SET_BIT( &ulTemp, AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_INT_IN );
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349 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_3 ] = ulTemp;
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350 /*AT91F_UDP_EnableIt( AT91C_BASE_UDP, AT91C_UDP_EPINT3 ); */
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352 portEXIT_CRITICAL();
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354 eDriverState = eREADY_TO_SEND;
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356 else if( eDriverState == eJUST_GOT_ADDRESS )
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358 /* We sent an acknowledgement of a SET_ADDRESS request. Move
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359 to the addressed state. */
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360 if( ulReceivedAddress != ( unsigned long ) 0 )
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362 AT91C_BASE_UDP->UDP_GLBSTATE = AT91C_UDP_FADDEN;
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366 AT91C_BASE_UDP->UDP_GLBSTATE = 0;
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369 AT91C_BASE_UDP->UDP_FADDR = ( AT91C_UDP_FEN | ulReceivedAddress );
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370 eDriverState = eNOTHING;
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374 /* The TXCOMP was not for any special type of transmission. See
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375 if there is any more data to send. */
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376 prvSendNextSegment();
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380 if( pxMessage->ulCSR0 & AT91C_UDP_RX_DATA_BK0 )
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382 /* Received a control data packet. May be a 0-length ACK or a data stage. */
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383 unsigned char ucBytesToGet;
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385 /* Got data. Cancel any outgoing data. */
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386 pxControlTx.ulNextCharIndex = pxControlTx.ulTotalDataLength;
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388 /* Determine how many bytes we need to receive. */
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389 ucBytesToGet = pxControlRx.ulTotalDataLength - pxControlRx.ulNextCharIndex;
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390 if( ucBytesToGet > ulRxBytes )
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392 ucBytesToGet = ulRxBytes;
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395 /* If we're not expecting any data, it's an ack - just quit now. */
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396 if( !ucBytesToGet )
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401 /* Get the required data and update the index. */
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402 memcpy( pxControlRx.ucBuffer, pxMessage->ucFifoData, ucBytesToGet );
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403 pxControlRx.ulNextCharIndex += ucBytesToGet;
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406 if( pxMessage->ulCSR0 & AT91C_UDP_RXSETUP )
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408 /* Received a SETUP packet. May be followed by data packets. */
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410 if( ulRxBytes >= usbEXPECTED_NUMBER_OF_BYTES )
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412 /* Create an xUSB_REQUEST variable from the raw bytes array. */
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414 xRequest.ucReqType = pxMessage->ucFifoData[ usbREQUEST_TYPE_INDEX ];
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415 xRequest.ucRequest = pxMessage->ucFifoData[ usbREQUEST_INDEX ];
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417 xRequest.usValue = pxMessage->ucFifoData[ usbVALUE_HIGH_BYTE ];
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418 xRequest.usValue <<= 8;
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419 xRequest.usValue |= pxMessage->ucFifoData[ usbVALUE_LOW_BYTE ];
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421 xRequest.usIndex = pxMessage->ucFifoData[ usbINDEX_HIGH_BYTE ];
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422 xRequest.usIndex <<= 8;
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423 xRequest.usIndex |= pxMessage->ucFifoData[ usbINDEX_LOW_BYTE ];
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425 xRequest.usLength = pxMessage->ucFifoData[ usbLENGTH_HIGH_BYTE ];
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426 xRequest.usLength <<= 8;
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427 xRequest.usLength |= pxMessage->ucFifoData[ usbLENGTH_LOW_BYTE ];
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429 pxControlRx.ulNextCharIndex = 0;
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430 if( ! (xRequest.ucReqType & 0x80) ) /* Host-to-Device transfer, may need to get data first */
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432 if( xRequest.usLength > usbMAX_CONTROL_MESSAGE_SIZE )
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434 /* Too big! No space for control data, stall and abort. */
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439 pxControlRx.ulTotalDataLength = xRequest.usLength;
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443 /* We're sending the data, don't wait for any. */
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444 pxControlRx.ulTotalDataLength = 0;
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449 /* See if we've got a pending request and all its associated data ready */
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450 if( ( pxMessage->ulCSR0 & ( AT91C_UDP_RX_DATA_BK0 | AT91C_UDP_RXSETUP ) )
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451 && ( pxControlRx.ulNextCharIndex >= pxControlRx.ulTotalDataLength ) )
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453 unsigned char ucRequest;
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455 /* Manipulate the ucRequestType and the ucRequest parameters to
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456 generate a zero based request selection. This is just done to
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457 break up the requests into subsections for clarity. The
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458 alternative would be to have more huge switch statement that would
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459 be difficult to optimise. */
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460 ucRequest = ( ( xRequest.ucReqType & 0x60 ) >> 3 );
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461 ucRequest |= ( xRequest.ucReqType & 0x03 );
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463 switch( ucRequest )
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465 case usbSTANDARD_DEVICE_REQUEST:
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466 /* Standard Device request */
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467 prvHandleStandardDeviceRequest( &xRequest );
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470 case usbSTANDARD_INTERFACE_REQUEST:
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471 /* Standard Interface request */
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472 prvHandleStandardInterfaceRequest( &xRequest );
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475 case usbSTANDARD_END_POINT_REQUEST:
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476 /* Standard Endpoint request */
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477 prvHandleStandardEndPointRequest( &xRequest );
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480 case usbCLASS_INTERFACE_REQUEST:
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481 /* Class Interface request */
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482 prvHandleClassInterfaceRequest( &xRequest );
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485 default: /* This is not something we want to respond to. */
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490 /*------------------------------------------------------------*/
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492 static void prvGetStandardDeviceDescriptor( xUSB_REQUEST *pxRequest )
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494 /* The type is in the high byte. Return whatever has been requested. */
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495 switch( ( pxRequest->usValue & 0xff00 ) >> 8 )
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497 case usbDESCRIPTOR_TYPE_DEVICE:
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498 prvSendControlData( ( unsigned char * ) &pxDeviceDescriptor, pxRequest->usLength, sizeof( pxDeviceDescriptor ), pdTRUE );
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501 case usbDESCRIPTOR_TYPE_CONFIGURATION:
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502 prvSendControlData( ( unsigned char * ) &( pxConfigDescriptor ), pxRequest->usLength, sizeof( pxConfigDescriptor ), pdTRUE );
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505 case usbDESCRIPTOR_TYPE_STRING:
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507 /* The index to the string descriptor is the lower byte. */
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508 switch( pxRequest->usValue & 0xff )
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510 case usbLANGUAGE_STRING:
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511 prvSendControlData( ( unsigned char * ) &pxLanguageStringDescriptor, pxRequest->usLength, sizeof(pxLanguageStringDescriptor), pdTRUE );
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514 case usbMANUFACTURER_STRING:
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515 prvSendControlData( ( unsigned char * ) &pxManufacturerStringDescriptor, pxRequest->usLength, sizeof( pxManufacturerStringDescriptor ), pdTRUE );
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518 case usbPRODUCT_STRING:
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519 prvSendControlData( ( unsigned char * ) &pxProductStringDescriptor, pxRequest->usLength, sizeof( pxProductStringDescriptor ), pdTRUE );
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522 case usbCONFIGURATION_STRING:
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523 prvSendControlData( ( unsigned char * ) &pxConfigurationStringDescriptor, pxRequest->usLength, sizeof( pxConfigurationStringDescriptor ), pdTRUE );
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526 case usbINTERFACE_STRING:
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527 prvSendControlData( ( unsigned char * ) &pxInterfaceStringDescriptor, pxRequest->usLength, sizeof( pxInterfaceStringDescriptor ), pdTRUE );
\r
541 /*------------------------------------------------------------*/
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543 static void prvHandleStandardDeviceRequest( xUSB_REQUEST *pxRequest )
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545 unsigned short usStatus = 0;
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547 switch( pxRequest->ucRequest )
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549 case usbGET_STATUS_REQUEST:
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550 /* Just send two byte dummy status. */
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551 prvSendControlData( ( unsigned char * ) &usStatus, sizeof( usStatus ), sizeof( usStatus ), pdFALSE );
\r
554 case usbGET_DESCRIPTOR_REQUEST:
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555 /* Send device descriptor */
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556 prvGetStandardDeviceDescriptor( pxRequest );
\r
559 case usbGET_CONFIGURATION_REQUEST:
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560 /* Send selected device configuration */
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561 prvSendControlData( ( unsigned char * ) &ucUSBConfig, sizeof( ucUSBConfig ), sizeof( ucUSBConfig ), pdFALSE );
\r
564 case usbSET_FEATURE_REQUEST:
\r
568 case usbSET_ADDRESS_REQUEST:
\r
569 /* Get assigned address and send ack, but don't implement new address until we get a TXCOMP */
\r
571 eDriverState = eJUST_GOT_ADDRESS;
\r
572 ulReceivedAddress = ( unsigned long ) pxRequest->usValue;
\r
575 case usbSET_CONFIGURATION_REQUEST:
\r
576 /* Ack SET_CONFIGURATION request, but don't implement until TXCOMP */
\r
577 ucUSBConfig = ( unsigned char ) ( pxRequest->usValue & 0xff );
\r
578 eDriverState = eJUST_GOT_CONFIG;
\r
583 /* Any unsupported request results in a STALL response. */
\r
588 /*------------------------------------------------------------*/
\r
590 static void prvHandleClassInterfaceRequest( xUSB_REQUEST *pxRequest )
\r
592 switch( pxRequest->ucRequest )
\r
594 case usbSEND_ENCAPSULATED_COMMAND:
\r
598 case usbGET_ENCAPSULATED_RESPONSE:
\r
602 case usbSET_LINE_CODING:
\r
603 /* Set line coding - baud rate, data bits, parity, stop bits */
\r
605 memcpy( ( void * ) pxLineCoding, pxControlRx.ucBuffer, sizeof( pxLineCoding ) );
\r
608 case usbGET_LINE_CODING:
\r
609 /* Get line coding */
\r
610 prvSendControlData( (unsigned char *) &pxLineCoding, pxRequest->usLength, sizeof( pxLineCoding ), pdFALSE );
\r
613 case usbSET_CONTROL_LINE_STATE:
\r
614 /* D0: 1=DTR, 0=No DTR, D1: 1=Activate Carrier, 0=Deactivate carrier (RTS, half-duplex) */
\r
616 ucControlState = pxRequest->usValue;
\r
624 /*------------------------------------------------------------*/
\r
626 static void prvGetStandardInterfaceDescriptor( xUSB_REQUEST *pxRequest )
\r
628 switch( ( pxRequest->usValue & ( unsigned short ) 0xff00 ) >> 8 )
\r
635 /*-----------------------------------------------------------*/
\r
637 static void prvHandleStandardInterfaceRequest( xUSB_REQUEST *pxRequest )
\r
639 unsigned short usStatus = 0;
\r
641 switch( pxRequest->ucRequest )
\r
643 case usbGET_STATUS_REQUEST:
\r
644 /* Send dummy 2 bytes. */
\r
645 prvSendControlData( ( unsigned char * ) &usStatus, sizeof( usStatus ), sizeof( usStatus ), pdFALSE );
\r
648 case usbGET_DESCRIPTOR_REQUEST:
\r
649 prvGetStandardInterfaceDescriptor( pxRequest );
\r
652 /* This minimal implementation does not respond to these. */
\r
653 case usbGET_INTERFACE_REQUEST:
\r
654 case usbSET_FEATURE_REQUEST:
\r
655 case usbSET_INTERFACE_REQUEST:
\r
662 /*-----------------------------------------------------------*/
\r
664 static void prvHandleStandardEndPointRequest( xUSB_REQUEST *pxRequest )
\r
666 switch( pxRequest->ucRequest )
\r
668 /* This minimal implementation does not expect to respond to these. */
\r
669 case usbGET_STATUS_REQUEST:
\r
670 case usbCLEAR_FEATURE_REQUEST:
\r
671 case usbSET_FEATURE_REQUEST:
\r
678 /*-----------------------------------------------------------*/
\r
680 static void vDetachUSBInterface( void)
\r
682 /* Setup the PIO for the USB pull up resistor. */
\r
683 AT91C_BASE_PIOA->PIO_PER = AT91C_PIO_PA16;
\r
684 AT91C_BASE_PIOA->PIO_OER = AT91C_PIO_PA16;
\r
687 /* Disable pull up */
\r
688 AT91C_BASE_PIOA->PIO_SODR = AT91C_PIO_PA16;
\r
690 /*-----------------------------------------------------------*/
\r
692 static void vInitUSBInterface( void )
\r
694 extern void ( vUSB_ISR_Wrapper )( void );
\r
696 /* Create the queue used to communicate between the USB ISR and task. */
\r
697 xUSBInterruptQueue = xQueueCreate( usbQUEUE_LENGTH + 1, sizeof( xISRStatus * ) );
\r
699 /* Create the queues used to hold Rx and Tx characters. */
\r
700 xRxCDC = xQueueCreate( USB_CDC_QUEUE_SIZE, ( unsigned char ) sizeof( signed char ) );
\r
701 xTxCDC = xQueueCreate( USB_CDC_QUEUE_SIZE + 1, ( unsigned char ) sizeof( signed char ) );
\r
703 if( (!xUSBInterruptQueue) || (!xRxCDC) || (!xTxCDC) )
\r
705 /* Not enough RAM to create queues!. */
\r
709 /* Initialise a few state variables. */
\r
710 pxControlTx.ulNextCharIndex = ( unsigned long ) 0;
\r
711 pxControlRx.ulNextCharIndex = ( unsigned long ) 0;
\r
712 ucUSBConfig = ( unsigned char ) 0;
\r
713 eDriverState = eNOTHING;
\r
714 ucControlState = 0;
\r
715 uiCurrentBank = AT91C_UDP_RX_DATA_BK0;
\r
718 /* HARDWARE SETUP */
\r
720 /* Set the PLL USB Divider */
\r
721 AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1;
\r
723 /* Enables the 48MHz USB clock UDPCK and System Peripheral USB Clock. */
\r
724 AT91C_BASE_PMC->PMC_SCER = AT91C_PMC_UDP;
\r
725 AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_UDP);
\r
727 /* Setup the PIO for the USB pull up resistor. */
\r
728 AT91C_BASE_PIOA->PIO_PER = AT91C_PIO_PA16;
\r
729 AT91C_BASE_PIOA->PIO_OER = AT91C_PIO_PA16;
\r
732 /* Start without the pullup - this will get set at the end of this
\r
734 AT91C_BASE_PIOA->PIO_SODR = AT91C_PIO_PA16;
\r
737 /* When using the USB debugger the peripheral registers do not always get
\r
738 set to the correct default values. To make sure set the relevant registers
\r
740 AT91C_BASE_UDP->UDP_IDR = ( unsigned long ) 0xffffffff;
\r
741 AT91C_BASE_UDP->UDP_ICR = ( unsigned long ) 0xffffffff;
\r
742 AT91C_BASE_UDP->UDP_CSR[ 0 ] = ( unsigned long ) 0x00;
\r
743 AT91C_BASE_UDP->UDP_CSR[ 1 ] = ( unsigned long ) 0x00;
\r
744 AT91C_BASE_UDP->UDP_CSR[ 2 ] = ( unsigned long ) 0x00;
\r
745 AT91C_BASE_UDP->UDP_CSR[ 3 ] = ( unsigned long ) 0x00;
\r
746 AT91C_BASE_UDP->UDP_GLBSTATE = 0;
\r
747 AT91C_BASE_UDP->UDP_FADDR = 0;
\r
749 /* Enable the transceiver. */
\r
750 AT91C_UDP_TRANSCEIVER_ENABLE = 0;
\r
752 /* Enable the USB interrupts - other interrupts get enabled as the
\r
753 enumeration process progresses. */
\r
754 AT91F_AIC_ConfigureIt( AT91C_ID_UDP, usbINTERRUPT_PRIORITY, AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, ( void (*)( void ) ) vUSB_ISR_Wrapper );
\r
755 AT91C_BASE_AIC->AIC_IECR = 0x1 << AT91C_ID_UDP;
\r
758 /* Wait a short while before making our presence known. */
\r
759 vTaskDelay( usbINIT_DELAY );
\r
760 AT91C_BASE_PIOA->PIO_CODR = AT91C_PIO_PA16;
\r
762 /*-----------------------------------------------------------*/
\r
764 static void prvSendControlData( unsigned char *pucData, unsigned short usRequestedLength, unsigned long ulLengthToSend, long lSendingDescriptor )
\r
766 if( ( ( unsigned long ) usRequestedLength < ulLengthToSend ) )
\r
768 /* Cap the data length to that requested. */
\r
769 ulLengthToSend = ( unsigned short ) usRequestedLength;
\r
771 else if( ( ulLengthToSend < ( unsigned long ) usRequestedLength ) && lSendingDescriptor )
\r
773 /* We are sending a descriptor. If the descriptor is an exact
\r
774 multiple of the FIFO length then it will have to be terminated
\r
775 with a NULL packet. Set the state to indicate this if
\r
777 if( ( ulLengthToSend % usbFIFO_LENGTH ) == 0 )
\r
779 eDriverState = eSENDING_EVEN_DESCRIPTOR;
\r
783 /* Here we assume that the previous message has been sent. THERE IS NO
\r
784 BUFFER OVERFLOW PROTECTION HERE.
\r
786 Copy the data to send into the buffer as we cannot send it all at once
\r
787 (if it is greater than 8 bytes in length). */
\r
788 memcpy( pxControlTx.ucBuffer, pucData, ulLengthToSend );
\r
790 /* Reinitialise the buffer index so we start sending from the start of
\r
792 pxControlTx.ulTotalDataLength = ulLengthToSend;
\r
793 pxControlTx.ulNextCharIndex = ( unsigned long ) 0;
\r
795 /* Send the first 8 bytes now. The rest will get sent in response to
\r
796 TXCOMP interrupts. */
\r
797 prvSendNextSegment();
\r
799 /*-----------------------------------------------------------*/
\r
801 static void prvSendNextSegment( void )
\r
803 volatile unsigned long ulNextLength, ulStatus, ulLengthLeftToSend;
\r
805 /* Is there any data to send? */
\r
806 if( pxControlTx.ulTotalDataLength > pxControlTx.ulNextCharIndex )
\r
808 ulLengthLeftToSend = pxControlTx.ulTotalDataLength - pxControlTx.ulNextCharIndex;
\r
810 /* We can only send 8 bytes to the fifo at a time. */
\r
811 if( ulLengthLeftToSend > usbFIFO_LENGTH )
\r
813 ulNextLength = usbFIFO_LENGTH;
\r
817 ulNextLength = ulLengthLeftToSend;
\r
820 /* Wait until we can place data in the fifo. THERE IS NO TIMEOUT
\r
822 while( AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] & AT91C_UDP_TXPKTRDY )
\r
824 vTaskDelay( usbSHORTEST_DELAY );
\r
827 /* Write the data to the FIFO. */
\r
828 while( ulNextLength > ( unsigned long ) 0 )
\r
830 AT91C_BASE_UDP->UDP_FDR[ usbEND_POINT_0 ] = pxControlTx.ucBuffer[ pxControlTx.ulNextCharIndex ];
\r
833 pxControlTx.ulNextCharIndex++;
\r
836 /* Start the transmission. */
\r
837 portENTER_CRITICAL();
\r
839 ulStatus = AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ];
\r
840 usbCSR_SET_BIT( &ulStatus, ( ( unsigned long ) 0x10 ) );
\r
841 AT91C_BASE_UDP->UDP_CSR[ usbEND_POINT_0 ] = ulStatus;
\r
843 portEXIT_CRITICAL();
\r
847 /* There is no data to send. If we were sending a descriptor and the
\r
848 descriptor was an exact multiple of the max packet size then we need
\r
849 to send a null to terminate the transmission. */
\r
850 if( eDriverState == eSENDING_EVEN_DESCRIPTOR )
\r
853 eDriverState = eNOTHING;
\r