USBHAL_LPC17.cpp

00001 /* Copyright (c) 2010-2011 mbed.org, MIT License
00002 *
00003 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
00004 * and associated documentation files (the "Software"), to deal in the Software without
00005 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
00006 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
00007 * Software is furnished to do so, subject to the following conditions:
00008 *
00009 * The above copyright notice and this permission notice shall be included in all copies or
00010 * substantial portions of the Software.
00011 *
00012 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
00013 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00014 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
00015 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00016 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00017 */
00018 
00019 #if defined(TARGET_LPC1768) || defined(TARGET_LPC2368) || defined(TARGET_LPC2460)
00020 
00021 #include "USBHAL.h"
00022 
00023 
00024 // Get endpoint direction
00025 #define IN_EP(endpoint)     ((endpoint) & 1U ? true : false)
00026 #define OUT_EP(endpoint)    ((endpoint) & 1U ? false : true)
00027 
00028 // Convert physical endpoint number to register bit
00029 #define EP(endpoint) (1UL<<endpoint)
00030 
00031 // Power Control for Peripherals register
00032 #define PCUSB      (1UL<<31)
00033 
00034 // USB Clock Control register
00035 #define DEV_CLK_EN (1UL<<1)
00036 #define AHB_CLK_EN (1UL<<4)
00037 
00038 // USB Clock Status register
00039 #define DEV_CLK_ON (1UL<<1)
00040 #define AHB_CLK_ON (1UL<<4)
00041 
00042 // USB Device Interupt registers
00043 #define FRAME      (1UL<<0)
00044 #define EP_FAST    (1UL<<1)
00045 #define EP_SLOW    (1UL<<2)
00046 #define DEV_STAT   (1UL<<3)
00047 #define CCEMPTY    (1UL<<4)
00048 #define CDFULL     (1UL<<5)
00049 #define RxENDPKT   (1UL<<6)
00050 #define TxENDPKT   (1UL<<7)
00051 #define EP_RLZED   (1UL<<8)
00052 #define ERR_INT    (1UL<<9)
00053 
00054 // USB Control register
00055 #define RD_EN (1<<0)
00056 #define WR_EN (1<<1)
00057 #define LOG_ENDPOINT(endpoint) ((endpoint>>1)<<2)
00058 
00059 // USB Receive Packet Length register
00060 #define DV      (1UL<<10)
00061 #define PKT_RDY (1UL<<11)
00062 #define PKT_LNGTH_MASK (0x3ff)
00063 
00064 // Serial Interface Engine (SIE)
00065 #define SIE_WRITE   (0x01)
00066 #define SIE_READ    (0x02)
00067 #define SIE_COMMAND (0x05)
00068 #define SIE_CMD_CODE(phase, data) ((phase<<8)|(data<<16))
00069 
00070 // SIE Command codes
00071 #define SIE_CMD_SET_ADDRESS        (0xD0)
00072 #define SIE_CMD_CONFIGURE_DEVICE   (0xD8)
00073 #define SIE_CMD_SET_MODE           (0xF3)
00074 #define SIE_CMD_READ_FRAME_NUMBER  (0xF5)
00075 #define SIE_CMD_READ_TEST_REGISTER (0xFD)
00076 #define SIE_CMD_SET_DEVICE_STATUS  (0xFE)
00077 #define SIE_CMD_GET_DEVICE_STATUS  (0xFE)
00078 #define SIE_CMD_GET_ERROR_CODE     (0xFF)
00079 #define SIE_CMD_READ_ERROR_STATUS  (0xFB)
00080 
00081 #define SIE_CMD_SELECT_ENDPOINT(endpoint)                 (0x00+endpoint)
00082 #define SIE_CMD_SELECT_ENDPOINT_CLEAR_INTERRUPT(endpoint) (0x40+endpoint)
00083 #define SIE_CMD_SET_ENDPOINT_STATUS(endpoint)             (0x40+endpoint)
00084 
00085 #define SIE_CMD_CLEAR_BUFFER    (0xF2)
00086 #define SIE_CMD_VALIDATE_BUFFER (0xFA)
00087 
00088 // SIE Device Status register
00089 #define SIE_DS_CON    (1<<0)
00090 #define SIE_DS_CON_CH (1<<1)
00091 #define SIE_DS_SUS    (1<<2)
00092 #define SIE_DS_SUS_CH (1<<3)
00093 #define SIE_DS_RST    (1<<4)
00094 
00095 // SIE Device Set Address register
00096 #define SIE_DSA_DEV_EN  (1<<7)
00097 
00098 // SIE Configue Device register
00099 #define SIE_CONF_DEVICE (1<<0)
00100 
00101 // Select Endpoint register
00102 #define SIE_SE_FE       (1<<0)
00103 #define SIE_SE_ST       (1<<1)
00104 #define SIE_SE_STP      (1<<2)
00105 #define SIE_SE_PO       (1<<3)
00106 #define SIE_SE_EPN      (1<<4)
00107 #define SIE_SE_B_1_FULL (1<<5)
00108 #define SIE_SE_B_2_FULL (1<<6)
00109 
00110 // Set Endpoint Status command
00111 #define SIE_SES_ST      (1<<0)
00112 #define SIE_SES_DA      (1<<5)
00113 #define SIE_SES_RF_MO   (1<<6)
00114 #define SIE_SES_CND_ST  (1<<7)
00115 
00116 
00117 USBHAL * USBHAL::instance;
00118 
00119 static volatile uint8_t in_isr;
00120 static volatile int epComplete;
00121 static uint32_t endpointStallState;
00122 
00123 static void SIECommand(uint32_t command) {
00124     // The command phase of a SIE transaction
00125     LPC_USB->USBDevIntClr = CCEMPTY;
00126     LPC_USB->USBCmdCode = SIE_CMD_CODE(SIE_COMMAND, command);
00127     while (!(LPC_USB->USBDevIntSt & CCEMPTY));
00128 }
00129 
00130 static void SIEWriteData(uint8_t data) {
00131     // The data write phase of a SIE transaction
00132     LPC_USB->USBDevIntClr = CCEMPTY;
00133     LPC_USB->USBCmdCode = SIE_CMD_CODE(SIE_WRITE, data);
00134     while (!(LPC_USB->USBDevIntSt & CCEMPTY));
00135 }
00136 
00137 static uint8_t SIEReadData(uint32_t command) {
00138     // The data read phase of a SIE transaction
00139     LPC_USB->USBDevIntClr = CDFULL;
00140     LPC_USB->USBCmdCode = SIE_CMD_CODE(SIE_READ, command);
00141     while (!(LPC_USB->USBDevIntSt & CDFULL));
00142     return (uint8_t)LPC_USB->USBCmdData;
00143 }
00144 
00145 static void SIEsetDeviceStatus(uint8_t status) {
00146     // Write SIE device status register
00147     SIECommand(SIE_CMD_SET_DEVICE_STATUS);
00148     SIEWriteData(status);
00149 }
00150 
00151 static uint8_t SIEgetDeviceStatus(void) {
00152     // Read SIE device status register
00153     SIECommand(SIE_CMD_GET_DEVICE_STATUS);
00154     return SIEReadData(SIE_CMD_GET_DEVICE_STATUS);
00155 }
00156 
00157 void SIEsetAddress(uint8_t address) {
00158     // Write SIE device address register
00159     SIECommand(SIE_CMD_SET_ADDRESS);
00160     SIEWriteData((address & 0x7f) | SIE_DSA_DEV_EN);
00161 }
00162 
00163 static uint8_t SIEselectEndpoint(uint8_t endpoint) {
00164     // SIE select endpoint command
00165     SIECommand(SIE_CMD_SELECT_ENDPOINT(endpoint));
00166     return SIEReadData(SIE_CMD_SELECT_ENDPOINT(endpoint));
00167 }
00168 
00169 static uint8_t SIEclearBuffer(void) {
00170     // SIE clear buffer command
00171     SIECommand(SIE_CMD_CLEAR_BUFFER);
00172     return SIEReadData(SIE_CMD_CLEAR_BUFFER);
00173 }
00174 
00175 static void SIEvalidateBuffer(void) {
00176     // SIE validate buffer command
00177     SIECommand(SIE_CMD_VALIDATE_BUFFER);
00178 }
00179 
00180 static void SIEsetEndpointStatus(uint8_t endpoint, uint8_t status) {
00181     // SIE set endpoint status command
00182     SIECommand(SIE_CMD_SET_ENDPOINT_STATUS(endpoint));
00183     SIEWriteData(status);
00184 }
00185 
00186 static uint16_t SIEgetFrameNumber(void) __attribute__ ((unused));
00187 static uint16_t SIEgetFrameNumber(void) {
00188     // Read current frame number
00189     uint16_t lowByte;
00190     uint16_t highByte;
00191 
00192     SIECommand(SIE_CMD_READ_FRAME_NUMBER);
00193     lowByte = SIEReadData(SIE_CMD_READ_FRAME_NUMBER);
00194     highByte = SIEReadData(SIE_CMD_READ_FRAME_NUMBER);
00195 
00196     return (highByte << 8) | lowByte;
00197 }
00198 
00199 static void SIEconfigureDevice(void) {
00200     // SIE Configure device command
00201     SIECommand(SIE_CMD_CONFIGURE_DEVICE);
00202     SIEWriteData(SIE_CONF_DEVICE);
00203 }
00204 
00205 static void SIEunconfigureDevice(void) {
00206     // SIE Configure device command
00207     SIECommand(SIE_CMD_CONFIGURE_DEVICE);
00208     SIEWriteData(0);
00209 }
00210 
00211 static void SIEconnect(void) {
00212     // Connect USB device
00213     uint8_t status = SIEgetDeviceStatus();
00214     SIEsetDeviceStatus(status | SIE_DS_CON);
00215 }
00216 
00217 
00218 static void SIEdisconnect(void) {
00219     // Disconnect USB device
00220     uint8_t status = SIEgetDeviceStatus();
00221     SIEsetDeviceStatus(status & ~SIE_DS_CON);
00222 }
00223 
00224 
00225 static uint8_t selectEndpointClearInterrupt(uint8_t endpoint) {
00226     // Implemented using using EP_INT_CLR.
00227     LPC_USB->USBEpIntClr = EP(endpoint);
00228     while (!(LPC_USB->USBDevIntSt & CDFULL));
00229     return (uint8_t)LPC_USB->USBCmdData;
00230 }
00231 
00232 
00233 static void enableEndpointEvent(uint8_t endpoint) {
00234     // Enable an endpoint interrupt
00235     LPC_USB->USBEpIntEn |= EP(endpoint);
00236 }
00237 
00238 static void disableEndpointEvent(uint8_t endpoint) __attribute__ ((unused));
00239 static void disableEndpointEvent(uint8_t endpoint) {
00240     // Disable an endpoint interrupt
00241     LPC_USB->USBEpIntEn &= ~EP(endpoint);
00242 }
00243 
00244 static volatile uint32_t __attribute__((used)) dummyRead;
00245 uint32_t USBHAL::endpointReadcore(uint8_t endpoint, uint8_t *buffer) {
00246     // Read from an OUT endpoint
00247     uint32_t size;
00248     uint32_t i;
00249     uint32_t data = 0;
00250     uint8_t offset;
00251 
00252     LPC_USB->USBCtrl = LOG_ENDPOINT(endpoint) | RD_EN;
00253     while (!(LPC_USB->USBRxPLen & PKT_RDY));
00254 
00255     size = LPC_USB->USBRxPLen & PKT_LNGTH_MASK;
00256 
00257     offset = 0;
00258 
00259     if (size > 0) {
00260         for (i=0; i<size; i++) {
00261             if (offset==0) {
00262                 // Fetch up to four bytes of data as a word
00263                 data = LPC_USB->USBRxData;
00264             }
00265 
00266             // extract a byte
00267             *buffer = (data>>offset) & 0xff;
00268             buffer++;
00269 
00270             // move on to the next byte
00271             offset = (offset + 8) % 32;
00272         }
00273     } else {
00274         dummyRead = LPC_USB->USBRxData;
00275     }
00276 
00277     LPC_USB->USBCtrl = 0;
00278 
00279     if ((endpoint >> 1) % 3 || (endpoint >> 1) == 0) {
00280         SIEselectEndpoint(endpoint);
00281         SIEclearBuffer();
00282     }
00283     
00284     return size;
00285 }
00286 
00287 static void endpointWritecore(uint8_t endpoint, uint8_t *buffer, uint32_t size) {
00288     // Write to an IN endpoint
00289     uint32_t temp, data;
00290     uint8_t offset;
00291 
00292     LPC_USB->USBCtrl = LOG_ENDPOINT(endpoint) | WR_EN;
00293 
00294     LPC_USB->USBTxPLen = size;
00295     offset = 0;
00296     data = 0;
00297 
00298     if (size>0) {
00299         do {
00300             // Fetch next data byte into a word-sized temporary variable
00301             temp = *buffer++;
00302 
00303             // Add to current data word
00304             temp = temp << offset;
00305             data = data | temp;
00306 
00307             // move on to the next byte
00308             offset = (offset + 8) % 32;
00309             size--;
00310 
00311             if ((offset==0) || (size==0)) {
00312                 // Write the word to the endpoint
00313                 LPC_USB->USBTxData = data;
00314                 data = 0;
00315             }
00316         } while (size>0);
00317     } else {
00318         LPC_USB->USBTxData = 0;
00319     }
00320 
00321     // Clear WR_EN to cover zero length packet case
00322     LPC_USB->USBCtrl=0;
00323 
00324     SIEselectEndpoint(endpoint);
00325     SIEvalidateBuffer();
00326 }
00327 
00328 USBHAL::USBHAL(void) {
00329     // Disable IRQ
00330     NVIC_DisableIRQ(USB_IRQn);
00331     in_isr = 1; // Don't re-enable IRQs during calls this function makes
00332     
00333     // fill in callback array
00334     epCallback[0] = &USBHAL::EP1_OUT_callback;
00335     epCallback[1] = &USBHAL::EP1_IN_callback;
00336     epCallback[2] = &USBHAL::EP2_OUT_callback;
00337     epCallback[3] = &USBHAL::EP2_IN_callback;
00338     epCallback[4] = &USBHAL::EP3_OUT_callback;
00339     epCallback[5] = &USBHAL::EP3_IN_callback;
00340     epCallback[6] = &USBHAL::EP4_OUT_callback;
00341     epCallback[7] = &USBHAL::EP4_IN_callback;
00342     epCallback[8] = &USBHAL::EP5_OUT_callback;
00343     epCallback[9] = &USBHAL::EP5_IN_callback;
00344     epCallback[10] = &USBHAL::EP6_OUT_callback;
00345     epCallback[11] = &USBHAL::EP6_IN_callback;
00346     epCallback[12] = &USBHAL::EP7_OUT_callback;
00347     epCallback[13] = &USBHAL::EP7_IN_callback;
00348     epCallback[14] = &USBHAL::EP8_OUT_callback;
00349     epCallback[15] = &USBHAL::EP8_IN_callback;
00350     epCallback[16] = &USBHAL::EP9_OUT_callback;
00351     epCallback[17] = &USBHAL::EP9_IN_callback;
00352     epCallback[18] = &USBHAL::EP10_OUT_callback;
00353     epCallback[19] = &USBHAL::EP10_IN_callback;
00354     epCallback[20] = &USBHAL::EP11_OUT_callback;
00355     epCallback[21] = &USBHAL::EP11_IN_callback;
00356     epCallback[22] = &USBHAL::EP12_OUT_callback;
00357     epCallback[23] = &USBHAL::EP12_IN_callback;
00358     epCallback[24] = &USBHAL::EP13_OUT_callback;
00359     epCallback[25] = &USBHAL::EP13_IN_callback;
00360     epCallback[26] = &USBHAL::EP14_OUT_callback;
00361     epCallback[27] = &USBHAL::EP14_IN_callback;
00362     epCallback[28] = &USBHAL::EP15_OUT_callback;
00363     epCallback[29] = &USBHAL::EP15_IN_callback;
00364 
00365     // Enable power to USB device controller
00366     LPC_SC->PCONP |= PCUSB;
00367 
00368     // Enable USB clocks
00369     LPC_USB->USBClkCtrl |= DEV_CLK_EN | AHB_CLK_EN;
00370     while (LPC_USB->USBClkSt != (DEV_CLK_ON | AHB_CLK_ON));
00371 
00372     // Configure pins P0.29 and P0.30 to be USB D+ and USB D-
00373     LPC_PINCON->PINSEL1 &= 0xc3ffffff;
00374     LPC_PINCON->PINSEL1 |= 0x14000000;
00375 
00376     // Disconnect USB device
00377     SIEdisconnect();
00378 
00379     // Configure pin P2.9 to be Connect
00380     LPC_PINCON->PINSEL4 &= 0xfffcffff;
00381     LPC_PINCON->PINSEL4 |= 0x00040000;
00382 
00383     // Connect must be low for at least 2.5uS
00384     wait(0.3);
00385 
00386     // Set the maximum packet size for the control endpoints
00387     realiseEndpoint(EP0IN, MAX_PACKET_SIZE_EP0, 0);
00388     realiseEndpoint(EP0OUT, MAX_PACKET_SIZE_EP0, 0);
00389 
00390     // Attach IRQ
00391     instance = this;
00392     NVIC_SetVector(USB_IRQn, (uint32_t)&_usbisr);
00393 
00394     // Enable interrupts for device events and EP0
00395     LPC_USB->USBDevIntEn = EP_SLOW | DEV_STAT | FRAME;
00396     enableEndpointEvent(EP0IN);
00397     enableEndpointEvent(EP0OUT);
00398     
00399     in_isr = 0;
00400 }
00401 
00402 USBHAL::~USBHAL(void) {
00403     // Ensure device disconnected
00404     SIEdisconnect();
00405     // Disable USB interrupts
00406     NVIC_DisableIRQ(USB_IRQn);
00407 }
00408 
00409 void USBHAL::connect(void) {
00410     // Connect USB device
00411     SIEconnect();
00412     
00413     NVIC_EnableIRQ(USB_IRQn);
00414 }
00415 
00416 void USBHAL::disconnect(void) {
00417     NVIC_DisableIRQ(USB_IRQn);
00418     // Disconnect USB device
00419     SIEdisconnect();
00420 }
00421 
00422 void USBHAL::configureDevice(void) {
00423     if (!in_isr) NVIC_DisableIRQ(USB_IRQn);
00424     SIEconfigureDevice();
00425     if (!in_isr) NVIC_EnableIRQ(USB_IRQn);
00426 }
00427 
00428 void USBHAL::unconfigureDevice(void) {
00429     if (!in_isr) NVIC_DisableIRQ(USB_IRQn);
00430     SIEunconfigureDevice();
00431     if (!in_isr) NVIC_EnableIRQ(USB_IRQn);
00432 }
00433 
00434 void USBHAL::setAddress(uint8_t address) {
00435     if (!in_isr) NVIC_DisableIRQ(USB_IRQn);
00436     SIEsetAddress(address);
00437     if (!in_isr) NVIC_EnableIRQ(USB_IRQn);
00438 }
00439 
00440 void USBHAL::EP0setup(uint8_t *buffer) {
00441     if (!in_isr) NVIC_DisableIRQ(USB_IRQn);
00442     endpointReadcore(EP0OUT, buffer);
00443     if (!in_isr) NVIC_EnableIRQ(USB_IRQn);
00444 }
00445 
00446 void USBHAL::EP0read(void) {
00447     // Not required
00448 }
00449 
00450 void USBHAL::EP0readStage(void) {
00451     // Not required
00452 }
00453 
00454 uint32_t USBHAL::EP0getReadResult(uint8_t *buffer) {
00455     if (!in_isr) NVIC_DisableIRQ(USB_IRQn);
00456     uint32_t result = endpointReadcore(EP0OUT, buffer);
00457     if (!in_isr) NVIC_EnableIRQ(USB_IRQn);
00458     
00459     return result;
00460 }
00461 
00462 void USBHAL::EP0write(uint8_t *buffer, uint32_t size) {
00463     if (!in_isr) NVIC_DisableIRQ(USB_IRQn);
00464     endpointWritecore(EP0IN, buffer, size);
00465     if (!in_isr) NVIC_EnableIRQ(USB_IRQn);
00466 }
00467 
00468 void USBHAL::EP0getWriteResult(void) {
00469     // Not required
00470 }
00471 
00472 void USBHAL::EP0stall(void) {
00473     // This will stall both control endpoints
00474     stallEndpoint(EP0OUT);
00475 }
00476 
00477 EP_STATUS USBHAL::endpointRead(uint8_t endpoint, uint32_t maximumSize) {
00478     return EP_PENDING;
00479 }
00480 
00481 EP_STATUS USBHAL::endpointReadResult(uint8_t endpoint, uint8_t * buffer, uint32_t *bytesRead) {
00482 
00483     //for isochronous endpoint, we don't wait an interrupt
00484     if ((endpoint >> 1) % 3 || (endpoint >> 1) == 0) {
00485         if (!(epComplete & EP(endpoint)))
00486             return EP_PENDING;
00487     }
00488 
00489     if (!in_isr) NVIC_DisableIRQ(USB_IRQn);
00490         
00491     *bytesRead = endpointReadcore(endpoint, buffer);
00492     epComplete &= ~EP(endpoint);
00493     
00494     if (!in_isr) NVIC_EnableIRQ(USB_IRQn);        
00495     
00496     return EP_COMPLETED;
00497 }
00498 
00499 EP_STATUS USBHAL::endpointWrite(uint8_t endpoint, uint8_t *data, uint32_t size) {
00500     if (getEndpointStallState(endpoint)) {
00501         return EP_STALLED;
00502     }
00503 
00504     if (!in_isr) NVIC_DisableIRQ(USB_IRQn);
00505     
00506     epComplete &= ~EP(endpoint);
00507 
00508     endpointWritecore(endpoint, data, size);
00509     
00510     if (!in_isr) NVIC_EnableIRQ(USB_IRQn);    
00511     
00512     return EP_PENDING;
00513 }
00514 
00515 EP_STATUS USBHAL::endpointWriteResult(uint8_t endpoint) {
00516     if (epComplete & EP(endpoint)) {
00517         if (!in_isr) NVIC_DisableIRQ(USB_IRQn);
00518         epComplete &= ~EP(endpoint);
00519         if (!in_isr) NVIC_EnableIRQ(USB_IRQn);
00520             
00521         return EP_COMPLETED;
00522     }
00523 
00524     return EP_PENDING;
00525 }
00526 
00527 bool USBHAL::realiseEndpoint(uint8_t endpoint, uint32_t maxPacket, uint32_t flags) {
00528     if (!in_isr) NVIC_DisableIRQ(USB_IRQn);
00529     
00530     // Realise an endpoint
00531     LPC_USB->USBDevIntClr = EP_RLZED;
00532     LPC_USB->USBReEp |= EP(endpoint);
00533     LPC_USB->USBEpInd = endpoint;
00534     LPC_USB->USBMaxPSize = maxPacket;
00535 
00536     while (!(LPC_USB->USBDevIntSt & EP_RLZED));
00537     LPC_USB->USBDevIntClr = EP_RLZED;
00538 
00539     // Clear stall state
00540     endpointStallState &= ~EP(endpoint);
00541 
00542     enableEndpointEvent(endpoint);
00543 
00544     if (!in_isr) NVIC_EnableIRQ(USB_IRQn);
00545     
00546     return true;
00547 }
00548 
00549 void USBHAL::stallEndpoint(uint8_t endpoint) {
00550     if (!in_isr) NVIC_DisableIRQ(USB_IRQn);
00551     
00552     // Stall an endpoint
00553     if ( (endpoint==EP0IN) || (endpoint==EP0OUT) ) {
00554         // Conditionally stall both control endpoints
00555         SIEsetEndpointStatus(EP0OUT, SIE_SES_CND_ST);
00556     } else {
00557         SIEsetEndpointStatus(endpoint, SIE_SES_ST);
00558 
00559         // Update stall state
00560         endpointStallState |= EP(endpoint);
00561     }
00562     
00563     if (!in_isr) NVIC_EnableIRQ(USB_IRQn);
00564 }
00565 
00566 void USBHAL::unstallEndpoint(uint8_t endpoint) {
00567     if (!in_isr) NVIC_DisableIRQ(USB_IRQn);
00568     
00569     // Unstall an endpoint. The endpoint will also be reinitialised
00570     SIEsetEndpointStatus(endpoint, 0);
00571 
00572     // Update stall state
00573     endpointStallState &= ~EP(endpoint);
00574     
00575     if (!in_isr) NVIC_EnableIRQ(USB_IRQn);
00576 }
00577 
00578 bool USBHAL::getEndpointStallState(uint8_t endpoint) {
00579     // Returns true if endpoint stalled
00580     return endpointStallState & EP(endpoint);
00581 }
00582 
00583 void USBHAL::remoteWakeup(void) {
00584     // Remote wakeup
00585     uint8_t status;
00586 
00587     if (!in_isr) NVIC_DisableIRQ(USB_IRQn);
00588     
00589     // Enable USB clocks
00590     LPC_USB->USBClkCtrl |= DEV_CLK_EN | AHB_CLK_EN;
00591     while (LPC_USB->USBClkSt != (DEV_CLK_ON | AHB_CLK_ON));
00592 
00593     status = SIEgetDeviceStatus();
00594     SIEsetDeviceStatus(status & ~SIE_DS_SUS);
00595     
00596     if (!in_isr) NVIC_EnableIRQ(USB_IRQn);
00597 }
00598 
00599 void USBHAL::_usbisr(void) {
00600     instance->usbisr();
00601 }
00602 
00603 
00604 void USBHAL::usbisr(void) {
00605     uint8_t devStat;
00606 
00607     in_isr = 1;
00608     if (LPC_USB->USBDevIntSt & FRAME) {
00609         // Start of frame event
00610         SOF(SIEgetFrameNumber());
00611         // Clear interrupt status flag
00612         LPC_USB->USBDevIntClr = FRAME;
00613     }
00614 
00615     if (LPC_USB->USBDevIntSt & DEV_STAT) {
00616         // Device Status interrupt
00617         // Must clear the interrupt status flag before reading the device status from the SIE
00618         LPC_USB->USBDevIntClr = DEV_STAT;
00619 
00620         // Read device status from SIE
00621         devStat = SIEgetDeviceStatus();
00622         //printf("devStat: %d\r\n", devStat);
00623 
00624         if (devStat & SIE_DS_SUS_CH) {
00625             // Suspend status changed
00626             if((devStat & SIE_DS_SUS) != 0) {
00627                 suspendStateChanged(0);
00628             }
00629         }
00630 
00631         if (devStat & SIE_DS_RST) {
00632             // Bus reset
00633             if((devStat & SIE_DS_SUS) == 0) {
00634                 suspendStateChanged(1);
00635             }
00636             busReset();
00637         }
00638     }
00639 
00640     if (LPC_USB->USBDevIntSt & EP_SLOW) {
00641         // (Slow) Endpoint Interrupt
00642 
00643         // Process each endpoint interrupt
00644         if (LPC_USB->USBEpIntSt & EP(EP0OUT)) {
00645             if (selectEndpointClearInterrupt(EP0OUT) & SIE_SE_STP) {
00646                 // this is a setup packet
00647                 EP0setupCallback();
00648             } else {
00649                 EP0out();
00650             }
00651         }
00652 
00653         if (LPC_USB->USBEpIntSt & EP(EP0IN)) {
00654             selectEndpointClearInterrupt(EP0IN);
00655             EP0in();
00656         }
00657         
00658         for (uint8_t num = 2; num < 16*2; num++) {
00659             if (LPC_USB->USBEpIntSt & EP(num)) {
00660                 selectEndpointClearInterrupt(num);
00661                 epComplete |= EP(num);
00662                 if ((instance->*(epCallback[num - 2]))()) {
00663                     epComplete &= ~EP(num);
00664                 }
00665             }
00666         }
00667         LPC_USB->USBDevIntClr = EP_SLOW;
00668     }
00669     in_isr = 0;
00670 }
00671 
00672 #endif