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 int epComplete;
00120 static uint32_t endpointStallState;
00121 
00122 static void SIECommand(uint32_t command) {
00123     // The command phase of a SIE transaction
00124     LPC_USB->USBDevIntClr = CCEMPTY;
00125     LPC_USB->USBCmdCode = SIE_CMD_CODE(SIE_COMMAND, command);
00126     while (!(LPC_USB->USBDevIntSt & CCEMPTY));
00127 }
00128 
00129 static void SIEWriteData(uint8_t data) {
00130     // The data write phase of a SIE transaction
00131     LPC_USB->USBDevIntClr = CCEMPTY;
00132     LPC_USB->USBCmdCode = SIE_CMD_CODE(SIE_WRITE, data);
00133     while (!(LPC_USB->USBDevIntSt & CCEMPTY));
00134 }
00135 
00136 static uint8_t SIEReadData(uint32_t command) {
00137     // The data read phase of a SIE transaction
00138     LPC_USB->USBDevIntClr = CDFULL;
00139     LPC_USB->USBCmdCode = SIE_CMD_CODE(SIE_READ, command);
00140     while (!(LPC_USB->USBDevIntSt & CDFULL));
00141     return (uint8_t)LPC_USB->USBCmdData;
00142 }
00143 
00144 static void SIEsetDeviceStatus(uint8_t status) {
00145     // Write SIE device status register
00146     SIECommand(SIE_CMD_SET_DEVICE_STATUS);
00147     SIEWriteData(status);
00148 }
00149 
00150 static uint8_t SIEgetDeviceStatus(void) {
00151     // Read SIE device status register
00152     SIECommand(SIE_CMD_GET_DEVICE_STATUS);
00153     return SIEReadData(SIE_CMD_GET_DEVICE_STATUS);
00154 }
00155 
00156 void SIEsetAddress(uint8_t address) {
00157     // Write SIE device address register
00158     SIECommand(SIE_CMD_SET_ADDRESS);
00159     SIEWriteData((address & 0x7f) | SIE_DSA_DEV_EN);
00160 }
00161 
00162 static uint8_t SIEselectEndpoint(uint8_t endpoint) {
00163     // SIE select endpoint command
00164     SIECommand(SIE_CMD_SELECT_ENDPOINT(endpoint));
00165     return SIEReadData(SIE_CMD_SELECT_ENDPOINT(endpoint));
00166 }
00167 
00168 static uint8_t SIEclearBuffer(void) {
00169     // SIE clear buffer command
00170     SIECommand(SIE_CMD_CLEAR_BUFFER);
00171     return SIEReadData(SIE_CMD_CLEAR_BUFFER);
00172 }
00173 
00174 static void SIEvalidateBuffer(void) {
00175     // SIE validate buffer command
00176     SIECommand(SIE_CMD_VALIDATE_BUFFER);
00177 }
00178 
00179 static void SIEsetEndpointStatus(uint8_t endpoint, uint8_t status) {
00180     // SIE set endpoint status command
00181     SIECommand(SIE_CMD_SET_ENDPOINT_STATUS(endpoint));
00182     SIEWriteData(status);
00183 }
00184 
00185 static uint16_t SIEgetFrameNumber(void) __attribute__ ((unused));
00186 static uint16_t SIEgetFrameNumber(void) {
00187     // Read current frame number
00188     uint16_t lowByte;
00189     uint16_t highByte;
00190 
00191     SIECommand(SIE_CMD_READ_FRAME_NUMBER);
00192     lowByte = SIEReadData(SIE_CMD_READ_FRAME_NUMBER);
00193     highByte = SIEReadData(SIE_CMD_READ_FRAME_NUMBER);
00194 
00195     return (highByte << 8) | lowByte;
00196 }
00197 
00198 static void SIEconfigureDevice(void) {
00199     // SIE Configure device command
00200     SIECommand(SIE_CMD_CONFIGURE_DEVICE);
00201     SIEWriteData(SIE_CONF_DEVICE);
00202 }
00203 
00204 static void SIEunconfigureDevice(void) {
00205     // SIE Configure device command
00206     SIECommand(SIE_CMD_CONFIGURE_DEVICE);
00207     SIEWriteData(0);
00208 }
00209 
00210 static void SIEconnect(void) {
00211     // Connect USB device
00212     uint8_t status = SIEgetDeviceStatus();
00213     SIEsetDeviceStatus(status | SIE_DS_CON);
00214 }
00215 
00216 
00217 static void SIEdisconnect(void) {
00218     // Disconnect USB device
00219     uint8_t status = SIEgetDeviceStatus();
00220     SIEsetDeviceStatus(status & ~SIE_DS_CON);
00221 }
00222 
00223 
00224 static uint8_t selectEndpointClearInterrupt(uint8_t endpoint) {
00225     // Implemented using using EP_INT_CLR.
00226     LPC_USB->USBEpIntClr = EP(endpoint);
00227     while (!(LPC_USB->USBDevIntSt & CDFULL));
00228     return (uint8_t)LPC_USB->USBCmdData;
00229 }
00230 
00231 
00232 static void enableEndpointEvent(uint8_t endpoint) {
00233     // Enable an endpoint interrupt
00234     LPC_USB->USBEpIntEn |= EP(endpoint);
00235 }
00236 
00237 static void disableEndpointEvent(uint8_t endpoint) __attribute__ ((unused));
00238 static void disableEndpointEvent(uint8_t endpoint) {
00239     // Disable an endpoint interrupt
00240     LPC_USB->USBEpIntEn &= ~EP(endpoint);
00241 }
00242 
00243 static volatile uint32_t __attribute__((used)) dummyRead;
00244 uint32_t USBHAL::endpointReadcore(uint8_t endpoint, uint8_t *buffer) {
00245     // Read from an OUT endpoint
00246     uint32_t size;
00247     uint32_t i;
00248     uint32_t data = 0;
00249     uint8_t offset;
00250 
00251     LPC_USB->USBCtrl = LOG_ENDPOINT(endpoint) | RD_EN;
00252     while (!(LPC_USB->USBRxPLen & PKT_RDY));
00253 
00254     size = LPC_USB->USBRxPLen & PKT_LNGTH_MASK;
00255 
00256     offset = 0;
00257 
00258     if (size > 0) {
00259         for (i=0; i<size; i++) {
00260             if (offset==0) {
00261                 // Fetch up to four bytes of data as a word
00262                 data = LPC_USB->USBRxData;
00263             }
00264 
00265             // extract a byte
00266             *buffer = (data>>offset) & 0xff;
00267             buffer++;
00268 
00269             // move on to the next byte
00270             offset = (offset + 8) % 32;
00271         }
00272     } else {
00273         dummyRead = LPC_USB->USBRxData;
00274     }
00275 
00276     LPC_USB->USBCtrl = 0;
00277 
00278     if ((endpoint >> 1) % 3 || (endpoint >> 1) == 0) {
00279         SIEselectEndpoint(endpoint);
00280         SIEclearBuffer();
00281     }
00282 
00283     return size;
00284 }
00285 
00286 static void endpointWritecore(uint8_t endpoint, uint8_t *buffer, uint32_t size) {
00287     // Write to an IN endpoint
00288     uint32_t temp, data;
00289     uint8_t offset;
00290 
00291     LPC_USB->USBCtrl = LOG_ENDPOINT(endpoint) | WR_EN;
00292 
00293     LPC_USB->USBTxPLen = size;
00294     offset = 0;
00295     data = 0;
00296 
00297     if (size>0) {
00298         do {
00299             // Fetch next data byte into a word-sized temporary variable
00300             temp = *buffer++;
00301 
00302             // Add to current data word
00303             temp = temp << offset;
00304             data = data | temp;
00305 
00306             // move on to the next byte
00307             offset = (offset + 8) % 32;
00308             size--;
00309 
00310             if ((offset==0) || (size==0)) {
00311                 // Write the word to the endpoint
00312                 LPC_USB->USBTxData = data;
00313                 data = 0;
00314             }
00315         } while (size>0);
00316     } else {
00317         LPC_USB->USBTxData = 0;
00318     }
00319 
00320     // Clear WR_EN to cover zero length packet case
00321     LPC_USB->USBCtrl=0;
00322 
00323     SIEselectEndpoint(endpoint);
00324     SIEvalidateBuffer();
00325 }
00326 
00327 USBHAL::USBHAL(void) {
00328     // Disable IRQ
00329     NVIC_DisableIRQ(USB_IRQn);
00330 
00331     // fill in callback array
00332     epCallback[0] = &USBHAL::EP1_OUT_callback;
00333     epCallback[1] = &USBHAL::EP1_IN_callback;
00334     epCallback[2] = &USBHAL::EP2_OUT_callback;
00335     epCallback[3] = &USBHAL::EP2_IN_callback;
00336     epCallback[4] = &USBHAL::EP3_OUT_callback;
00337     epCallback[5] = &USBHAL::EP3_IN_callback;
00338     epCallback[6] = &USBHAL::EP4_OUT_callback;
00339     epCallback[7] = &USBHAL::EP4_IN_callback;
00340     epCallback[8] = &USBHAL::EP5_OUT_callback;
00341     epCallback[9] = &USBHAL::EP5_IN_callback;
00342     epCallback[10] = &USBHAL::EP6_OUT_callback;
00343     epCallback[11] = &USBHAL::EP6_IN_callback;
00344     epCallback[12] = &USBHAL::EP7_OUT_callback;
00345     epCallback[13] = &USBHAL::EP7_IN_callback;
00346     epCallback[14] = &USBHAL::EP8_OUT_callback;
00347     epCallback[15] = &USBHAL::EP8_IN_callback;
00348     epCallback[16] = &USBHAL::EP9_OUT_callback;
00349     epCallback[17] = &USBHAL::EP9_IN_callback;
00350     epCallback[18] = &USBHAL::EP10_OUT_callback;
00351     epCallback[19] = &USBHAL::EP10_IN_callback;
00352     epCallback[20] = &USBHAL::EP11_OUT_callback;
00353     epCallback[21] = &USBHAL::EP11_IN_callback;
00354     epCallback[22] = &USBHAL::EP12_OUT_callback;
00355     epCallback[23] = &USBHAL::EP12_IN_callback;
00356     epCallback[24] = &USBHAL::EP13_OUT_callback;
00357     epCallback[25] = &USBHAL::EP13_IN_callback;
00358     epCallback[26] = &USBHAL::EP14_OUT_callback;
00359     epCallback[27] = &USBHAL::EP14_IN_callback;
00360     epCallback[28] = &USBHAL::EP15_OUT_callback;
00361     epCallback[29] = &USBHAL::EP15_IN_callback;
00362 
00363     // Enable power to USB device controller
00364     LPC_SC->PCONP |= PCUSB;
00365 
00366     // Enable USB clocks
00367     LPC_USB->USBClkCtrl |= DEV_CLK_EN | AHB_CLK_EN;
00368     while (LPC_USB->USBClkSt != (DEV_CLK_ON | AHB_CLK_ON));
00369 
00370     // Configure pins P0.29 and P0.30 to be USB D+ and USB D-
00371     LPC_PINCON->PINSEL1 &= 0xc3ffffff;
00372     LPC_PINCON->PINSEL1 |= 0x14000000;
00373 
00374     // Disconnect USB device
00375     SIEdisconnect();
00376 
00377     // Configure pin P2.9 to be Connect
00378     LPC_PINCON->PINSEL4 &= 0xfffcffff;
00379     LPC_PINCON->PINSEL4 |= 0x00040000;
00380 
00381     // Connect must be low for at least 2.5uS
00382     wait(0.3);
00383 
00384     // Set the maximum packet size for the control endpoints
00385     realiseEndpoint(EP0IN, MAX_PACKET_SIZE_EP0, 0);
00386     realiseEndpoint(EP0OUT, MAX_PACKET_SIZE_EP0, 0);
00387 
00388     // Attach IRQ
00389     instance = this;
00390     NVIC_SetVector(USB_IRQn, (uint32_t)&_usbisr);
00391 
00392     // Enable interrupts for device events and EP0
00393     LPC_USB->USBDevIntEn = EP_SLOW | DEV_STAT | FRAME;
00394     enableEndpointEvent(EP0IN);
00395     enableEndpointEvent(EP0OUT);
00396 }
00397 
00398 USBHAL::~USBHAL(void) {
00399     // Ensure device disconnected
00400     SIEdisconnect();
00401     // Disable USB interrupts
00402     NVIC_DisableIRQ(USB_IRQn);
00403 }
00404 
00405 void USBHAL::connect(void) {
00406     NVIC_EnableIRQ(USB_IRQn);
00407     // Connect USB device
00408     SIEconnect();
00409 }
00410 
00411 void USBHAL::disconnect(void) {
00412     NVIC_DisableIRQ(USB_IRQn);
00413     // Disconnect USB device
00414     SIEdisconnect();
00415 }
00416 
00417 void USBHAL::configureDevice(void) {
00418     SIEconfigureDevice();
00419 }
00420 
00421 void USBHAL::unconfigureDevice(void) {
00422     SIEunconfigureDevice();
00423 }
00424 
00425 void USBHAL::setAddress(uint8_t address) {
00426     SIEsetAddress(address);
00427 }
00428 
00429 void USBHAL::EP0setup(uint8_t *buffer) {
00430     endpointReadcore(EP0OUT, buffer);
00431 }
00432 
00433 void USBHAL::EP0read(void) {
00434     // Not required
00435 }
00436 
00437 void USBHAL::EP0readStage(void) {
00438     // Not required
00439 }
00440 
00441 uint32_t USBHAL::EP0getReadResult(uint8_t *buffer) {
00442     return endpointReadcore(EP0OUT, buffer);
00443 }
00444 
00445 void USBHAL::EP0write(uint8_t *buffer, uint32_t size) {
00446     endpointWritecore(EP0IN, buffer, size);
00447 }
00448 
00449 void USBHAL::EP0getWriteResult(void) {
00450     // Not required
00451 }
00452 
00453 void USBHAL::EP0stall(void) {
00454     // This will stall both control endpoints
00455     stallEndpoint(EP0OUT);
00456 }
00457 
00458 EP_STATUS USBHAL::endpointRead(uint8_t endpoint, uint32_t maximumSize) {
00459     return EP_PENDING;
00460 }
00461 
00462 EP_STATUS USBHAL::endpointReadResult(uint8_t endpoint, uint8_t * buffer, uint32_t *bytesRead) {
00463 
00464     //for isochronous endpoint, we don't wait an interrupt
00465     if ((endpoint >> 1) % 3 || (endpoint >> 1) == 0) {
00466         if (!(epComplete & EP(endpoint)))
00467             return EP_PENDING;
00468     }
00469 
00470     *bytesRead = endpointReadcore(endpoint, buffer);
00471     epComplete &= ~EP(endpoint);
00472     return EP_COMPLETED;
00473 }
00474 
00475 EP_STATUS USBHAL::endpointWrite(uint8_t endpoint, uint8_t *data, uint32_t size) {
00476     if (getEndpointStallState(endpoint)) {
00477         return EP_STALLED;
00478     }
00479 
00480     epComplete &= ~EP(endpoint);
00481 
00482     endpointWritecore(endpoint, data, size);
00483     return EP_PENDING;
00484 }
00485 
00486 EP_STATUS USBHAL::endpointWriteResult(uint8_t endpoint) {
00487     if (epComplete & EP(endpoint)) {
00488         epComplete &= ~EP(endpoint);
00489         return EP_COMPLETED;
00490     }
00491 
00492     return EP_PENDING;
00493 }
00494 
00495 bool USBHAL::realiseEndpoint(uint8_t endpoint, uint32_t maxPacket, uint32_t flags) {
00496     // Realise an endpoint
00497     LPC_USB->USBDevIntClr = EP_RLZED;
00498     LPC_USB->USBReEp |= EP(endpoint);
00499     LPC_USB->USBEpInd = endpoint;
00500     LPC_USB->USBMaxPSize = maxPacket;
00501 
00502     while (!(LPC_USB->USBDevIntSt & EP_RLZED));
00503     LPC_USB->USBDevIntClr = EP_RLZED;
00504 
00505     // Clear stall state
00506     endpointStallState &= ~EP(endpoint);
00507 
00508     enableEndpointEvent(endpoint);
00509     return true;
00510 }
00511 
00512 void USBHAL::stallEndpoint(uint8_t endpoint) {
00513     // Stall an endpoint
00514     if ( (endpoint==EP0IN) || (endpoint==EP0OUT) ) {
00515         // Conditionally stall both control endpoints
00516         SIEsetEndpointStatus(EP0OUT, SIE_SES_CND_ST);
00517     } else {
00518         SIEsetEndpointStatus(endpoint, SIE_SES_ST);
00519 
00520         // Update stall state
00521         endpointStallState |= EP(endpoint);
00522     }
00523 }
00524 
00525 void USBHAL::unstallEndpoint(uint8_t endpoint) {
00526     // Unstall an endpoint. The endpoint will also be reinitialised
00527     SIEsetEndpointStatus(endpoint, 0);
00528 
00529     // Update stall state
00530     endpointStallState &= ~EP(endpoint);
00531 }
00532 
00533 bool USBHAL::getEndpointStallState(uint8_t endpoint) {
00534     // Returns true if endpoint stalled
00535     return endpointStallState & EP(endpoint);
00536 }
00537 
00538 void USBHAL::remoteWakeup(void) {
00539     // Remote wakeup
00540     uint8_t status;
00541 
00542     // Enable USB clocks
00543     LPC_USB->USBClkCtrl |= DEV_CLK_EN | AHB_CLK_EN;
00544     while (LPC_USB->USBClkSt != (DEV_CLK_ON | AHB_CLK_ON));
00545 
00546     status = SIEgetDeviceStatus();
00547     SIEsetDeviceStatus(status & ~SIE_DS_SUS);
00548 }
00549 
00550 void USBHAL::_usbisr(void) {
00551     instance->usbisr();
00552 }
00553 
00554 
00555 void USBHAL::usbisr(void) {
00556     uint8_t devStat;
00557 
00558     if (LPC_USB->USBDevIntSt & FRAME) {
00559         // Start of frame event
00560         SOF(SIEgetFrameNumber());
00561         // Clear interrupt status flag
00562         LPC_USB->USBDevIntClr = FRAME;
00563     }
00564 
00565     if (LPC_USB->USBDevIntSt & DEV_STAT) {
00566         // Device Status interrupt
00567         // Must clear the interrupt status flag before reading the device status from the SIE
00568         LPC_USB->USBDevIntClr = DEV_STAT;
00569 
00570         // Read device status from SIE
00571         devStat = SIEgetDeviceStatus();
00572         //printf("devStat: %d\r\n", devStat);
00573 
00574         if (devStat & SIE_DS_SUS_CH) {
00575             // Suspend status changed
00576             if((devStat & SIE_DS_SUS) != 0) {
00577                 suspendStateChanged(0);
00578             }
00579         }
00580 
00581         if (devStat & SIE_DS_RST) {
00582             // Bus reset
00583             if((devStat & SIE_DS_SUS) == 0) {
00584                 suspendStateChanged(1);
00585             }
00586             busReset();
00587         }
00588     }
00589 
00590     if (LPC_USB->USBDevIntSt & EP_SLOW) {
00591         // (Slow) Endpoint Interrupt
00592 
00593         // Process each endpoint interrupt
00594         if (LPC_USB->USBEpIntSt & EP(EP0OUT)) {
00595             if (selectEndpointClearInterrupt(EP0OUT) & SIE_SE_STP) {
00596                 // this is a setup packet
00597                 EP0setupCallback();
00598             } else {
00599                 EP0out();
00600             }
00601             LPC_USB->USBDevIntClr = EP_SLOW;
00602         }
00603 
00604         if (LPC_USB->USBEpIntSt & EP(EP0IN)) {
00605             selectEndpointClearInterrupt(EP0IN);
00606             LPC_USB->USBDevIntClr = EP_SLOW;
00607             EP0in();
00608         }
00609 
00610         for (uint8_t num = 2; num < 16*2; num++) {
00611             if (LPC_USB->USBEpIntSt & EP(num)) {
00612                 selectEndpointClearInterrupt(num);
00613                 epComplete |= EP(num);
00614                 LPC_USB->USBDevIntClr = EP_SLOW;
00615                 if ((instance->*(epCallback[num - 2]))()) {
00616                     epComplete &= ~EP(num);
00617                 }
00618             }
00619         }
00620     }
00621 }
00622 
00623 #endif