Diff: USBDevice/USBHAL_LPC11U.cpp

Revision:

1:80ab0d068708

Child:

3:6d85e04fb59f

diff -r d8db74b663b3 -r 80ab0d068708 USBDevice/USBHAL_LPC11U.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/USBDevice/USBHAL_LPC11U.cpp	Tue Jul 17 14:30:29 2012 +0000
@@ -0,0 +1,712 @@
+/* Copyright (c) 2010-2011 mbed.org, MIT License
+*
+* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+* and associated documentation files (the "Software"), to deal in the Software without
+* restriction, including without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
+* Software is furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in all copies or
+* substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#ifdef TARGET_LPC11U24
+
+#include "USBHAL.h"
+
+USBHAL * USBHAL::instance;
+
+
+// Valid physical endpoint numbers are 0 to (NUMBER_OF_PHYSICAL_ENDPOINTS-1)
+#define LAST_PHYSICAL_ENDPOINT (NUMBER_OF_PHYSICAL_ENDPOINTS-1)
+
+// Convert physical endpoint number to register bit
+#define EP(endpoint) (1UL<<endpoint)
+
+// Convert physical to logical
+#define PHY_TO_LOG(endpoint)    ((endpoint)>>1)
+
+// Get endpoint direction
+#define IN_EP(endpoint)     ((endpoint) & 1U ? true : false)
+#define OUT_EP(endpoint)    ((endpoint) & 1U ? false : true)
+
+// USB RAM
+#define USB_RAM_START (0x20004000)
+#define USB_RAM_SIZE  (0x00000800)
+
+// SYSAHBCLKCTRL
+#define CLK_USB     (1UL<<14)
+#define CLK_USBRAM  (1UL<<27)
+
+// USB Information register
+#define FRAME_NR(a)     ((a) & 0x7ff)   // Frame number
+
+// USB Device Command/Status register
+#define DEV_ADDR_MASK   (0x7f)          // Device address
+#define DEV_ADDR(a)     ((a) & DEV_ADDR_MASK)
+#define DEV_EN          (1UL<<7)        // Device enable
+#define SETUP           (1UL<<8)        // SETUP token received
+#define PLL_ON          (1UL<<9)        // PLL enabled in suspend
+#define DCON            (1UL<<16)       // Device status - connect
+#define DSUS            (1UL<<17)       // Device status - suspend
+#define DCON_C          (1UL<<24)       // Connect change
+#define DSUS_C          (1UL<<25)       // Suspend change
+#define DRES_C          (1UL<<26)       // Reset change
+#define VBUSDEBOUNCED   (1UL<<28)       // Vbus detected
+
+// Endpoint Command/Status list
+#define CMDSTS_A                 (1UL<<31)          // Active
+#define CMDSTS_D                 (1UL<<30)          // Disable
+#define CMDSTS_S                 (1UL<<29)          // Stall
+#define CMDSTS_TR                (1UL<<28)          // Toggle Reset
+#define CMDSTS_RF                (1UL<<27)          // Rate Feedback mode
+#define CMDSTS_TV                (1UL<<27)          // Toggle Value
+#define CMDSTS_T                 (1UL<<26)          // Endpoint Type
+#define CMDSTS_NBYTES(n)         (((n)&0x3ff)<<16)  // Number of bytes
+#define CMDSTS_ADDRESS_OFFSET(a) (((a)>>6)&0xffff)  // Buffer start address
+
+#define BYTES_REMAINING(s)       (((s)>>16)&0x3ff)  // Bytes remaining after transfer
+
+// USB Non-endpoint interrupt sources
+#define FRAME_INT   (1UL<<30)
+#define DEV_INT     (1UL<<31)
+
+static volatile int epComplete = 0;
+
+// One entry for a double-buffered logical endpoint in the endpoint
+// command/status list. Endpoint 0 is single buffered, out[1] is used
+// for the SETUP packet and in[1] is not used
+typedef __packed struct {
+    uint32_t out[2];
+    uint32_t in[2];
+} EP_COMMAND_STATUS;
+
+typedef __packed struct {
+    uint8_t out[MAX_PACKET_SIZE_EP0];
+    uint8_t in[MAX_PACKET_SIZE_EP0];
+    uint8_t setup[SETUP_PACKET_SIZE];
+} CONTROL_TRANSFER;
+
+typedef __packed struct {
+    uint32_t    maxPacket;
+    uint32_t    buffer[2];
+    uint32_t    options;
+} EP_STATE;
+
+static volatile EP_STATE endpointState[NUMBER_OF_PHYSICAL_ENDPOINTS];
+
+// Pointer to the endpoint command/status list
+static EP_COMMAND_STATUS *ep = NULL;
+
+// Pointer to endpoint 0 data (IN/OUT and SETUP)
+static CONTROL_TRANSFER *ct = NULL;
+
+// Shadow DEVCMDSTAT register to avoid accidentally clearing flags or
+// initiating a remote wakeup event.
+static volatile uint32_t devCmdStat;
+
+// Pointers used to allocate USB RAM
+static uint32_t usbRamPtr = USB_RAM_START;
+static uint32_t epRamPtr = 0; // Buffers for endpoints > 0 start here
+
+#define ROUND_UP_TO_MULTIPLE(x, m) ((((x)+((m)-1))/(m))*(m))
+
+void USBMemCopy(uint8_t *dst, uint8_t *src, uint32_t size);
+void USBMemCopy(uint8_t *dst, uint8_t *src, uint32_t size) {
+    if (size > 0) {
+        do {
+            *dst++ = *src++;
+        } while (--size > 0);
+    }
+}
+
+
+USBHAL::USBHAL(void) {
+    NVIC_DisableIRQ(USB_IRQn);
+
+    // nUSB_CONNECT output
+    LPC_IOCON->PIO0_6 = 0x00000001;
+
+    // Enable clocks (USB registers, USB RAM)
+    LPC_SYSCON->SYSAHBCLKCTRL |= CLK_USB | CLK_USBRAM;
+
+    // Ensure device disconnected (DCON not set)
+    LPC_USB->DEVCMDSTAT = 0;
+
+    // to ensure that the USB host sees the device as
+    // disconnected if the target CPU is reset.
+    wait(0.3);
+
+    // Reserve space in USB RAM for endpoint command/status list
+    // Must be 256 byte aligned
+    usbRamPtr = ROUND_UP_TO_MULTIPLE(usbRamPtr, 256);
+    ep = (EP_COMMAND_STATUS *)usbRamPtr;
+    usbRamPtr += (sizeof(EP_COMMAND_STATUS) * NUMBER_OF_LOGICAL_ENDPOINTS);
+    LPC_USB->EPLISTSTART = (uint32_t)(ep) & 0xffffff00;
+
+    // Reserve space in USB RAM for Endpoint 0
+    // Must be 64 byte aligned
+    usbRamPtr = ROUND_UP_TO_MULTIPLE(usbRamPtr, 64);
+    ct = (CONTROL_TRANSFER *)usbRamPtr;
+    usbRamPtr += sizeof(CONTROL_TRANSFER);
+    LPC_USB->DATABUFSTART =(uint32_t)(ct) & 0xffc00000;
+
+    // Setup command/status list for EP0
+    ep[0].out[0] = 0;
+    ep[0].in[0] =  0;
+    ep[0].out[1] = CMDSTS_ADDRESS_OFFSET((uint32_t)ct->setup);
+
+    // Route all interrupts to IRQ, some can be routed to
+    // USB_FIQ if you wish.
+    LPC_USB->INTROUTING = 0;
+
+    // Set device address 0, enable USB device, no remote wakeup
+    devCmdStat = DEV_ADDR(0) | DEV_EN | DSUS;
+    LPC_USB->DEVCMDSTAT = devCmdStat;
+
+    // Enable interrupts for device events and EP0
+    LPC_USB->INTEN = DEV_INT | EP(EP0IN) | EP(EP0OUT) | FRAME_INT;
+    instance = this;
+
+    //attach IRQ handler and enable interrupts
+    NVIC_SetVector(USB_IRQn, (uint32_t)&_usbisr);
+    NVIC_EnableIRQ(USB_IRQn);
+}
+
+USBHAL::~USBHAL(void) {
+    // Ensure device disconnected (DCON not set)
+    LPC_USB->DEVCMDSTAT = 0;
+
+    // Disable USB interrupts
+    NVIC_DisableIRQ(USB_IRQn);
+}
+
+void USBHAL::connect(void) {
+    devCmdStat |= DCON;
+    LPC_USB->DEVCMDSTAT = devCmdStat;
+}
+
+void USBHAL::disconnect(void) {
+    devCmdStat &= ~DCON;
+    LPC_USB->DEVCMDSTAT = devCmdStat;
+}
+
+void USBHAL::configureDevice(void) {
+}
+
+void USBHAL::unconfigureDevice(void) {
+}
+
+void USBHAL::EP0setup(uint8_t *buffer) {
+    // Copy setup packet data
+    USBMemCopy(buffer, ct->setup, SETUP_PACKET_SIZE);
+}
+
+void USBHAL::EP0read(void) {
+    // Start an endpoint 0 read
+
+    // The USB ISR will call USBDevice_EP0out() when a packet has been read,
+    // the USBDevice layer then calls USBBusInterface_EP0getReadResult() to
+    // read the data.
+
+    ep[0].out[0] = CMDSTS_A |CMDSTS_NBYTES(MAX_PACKET_SIZE_EP0) \
+                   | CMDSTS_ADDRESS_OFFSET((uint32_t)ct->out);
+}
+
+uint32_t USBHAL::EP0getReadResult(uint8_t *buffer) {
+    // Complete an endpoint 0 read
+    uint32_t bytesRead;
+
+    // Find how many bytes were read
+    bytesRead = MAX_PACKET_SIZE_EP0 - BYTES_REMAINING(ep[0].out[0]);
+
+    // Copy data
+    USBMemCopy(buffer, ct->out, bytesRead);
+    return bytesRead;
+}
+
+void USBHAL::EP0write(uint8_t *buffer, uint32_t size) {
+    // Start and endpoint 0 write
+
+    // The USB ISR will call USBDevice_EP0in() when the data has
+    // been written, the USBDevice layer then calls
+    // USBBusInterface_EP0getWriteResult() to complete the transaction.
+
+    // Copy data
+    USBMemCopy(ct->in, buffer, size);
+
+    // Start transfer
+    ep[0].in[0] = CMDSTS_A | CMDSTS_NBYTES(size) \
+                  | CMDSTS_ADDRESS_OFFSET((uint32_t)ct->in);
+}
+
+
+EP_STATUS USBHAL::endpointRead(uint8_t endpoint, uint32_t maximumSize) {
+    uint8_t bf = 0;
+    uint32_t flags = 0;
+
+    //check which buffer must be filled
+    if (LPC_USB->EPBUFCFG & EP(endpoint)) {
+        // Double buffered
+        if (LPC_USB->EPINUSE & EP(endpoint)) {
+            bf = 1;
+        } else {
+            bf = 0;
+        }
+    }
+    
+    // if isochronous endpoint, T = 1
+    if(endpointState[endpoint].options & ISOCHRONOUS)
+    {
+        flags |= CMDSTS_T;
+    }
+        
+    //Active the endpoint for reading
+    ep[PHY_TO_LOG(endpoint)].out[bf] = CMDSTS_A | CMDSTS_NBYTES(maximumSize) \
+                                       | CMDSTS_ADDRESS_OFFSET((uint32_t)ct->out) | flags;
+    return EP_PENDING;
+}
+
+EP_STATUS USBHAL::endpointReadResult(uint8_t endpoint, uint8_t *data, uint32_t *bytesRead) {
+
+    uint8_t bf = 0;
+
+    if (!(epComplete & EP(endpoint)))
+        return EP_PENDING;
+    else {
+        epComplete &= ~EP(endpoint);
+
+        //check which buffer has been filled
+        if (LPC_USB->EPBUFCFG & EP(endpoint)) {
+            // Double buffered (here we read the previous buffer which was used)
+            if (LPC_USB->EPINUSE & EP(endpoint)) {
+                bf = 0;
+            } else {
+                bf = 1;
+            }
+        }
+
+        // Find how many bytes were read
+        *bytesRead = (uint32_t) (endpointState[endpoint].maxPacket - BYTES_REMAINING(ep[PHY_TO_LOG(endpoint)].out[bf]));
+
+        // Copy data
+        USBMemCopy(data, ct->out, *bytesRead);
+        return EP_COMPLETED;
+    }
+}
+
+void USBHAL::EP0getWriteResult(void) {
+    // Complete an endpoint 0 write
+
+    // Nothing required for this target
+    return;
+}
+
+void USBHAL::EP0stall(void) {
+    ep[0].in[0] = CMDSTS_S;
+    ep[0].out[0] = CMDSTS_S;
+}
+
+void USBHAL::setAddress(uint8_t address) {
+    devCmdStat &= ~DEV_ADDR_MASK;
+    devCmdStat |= DEV_ADDR(address);
+    LPC_USB->DEVCMDSTAT = devCmdStat;
+}
+
+EP_STATUS USBHAL::endpointWrite(uint8_t endpoint, uint8_t *data, uint32_t size) {
+    uint32_t flags = 0;
+    uint32_t bf;
+
+    // Validate parameters
+    if (data == NULL) {
+        return EP_INVALID;
+    }
+
+    if (endpoint > LAST_PHYSICAL_ENDPOINT) {
+        return EP_INVALID;
+    }
+
+    if ((endpoint==EP0IN) || (endpoint==EP0OUT)) {
+        return EP_INVALID;
+    }
+
+    if (size > endpointState[endpoint].maxPacket) {
+        return EP_INVALID;
+    }
+
+    if (LPC_USB->EPBUFCFG & EP(endpoint)) {
+        // Double buffered
+        if (LPC_USB->EPINUSE & EP(endpoint)) {
+            bf = 1;
+        } else {
+            bf = 0;
+        }
+    } else {
+        // Single buffered
+        bf = 0;
+    }
+
+    // Check if already active
+    if (ep[PHY_TO_LOG(endpoint)].in[bf] & CMDSTS_A) {
+        return EP_INVALID;
+    }
+
+    // Check if stalled
+    if (ep[PHY_TO_LOG(endpoint)].in[bf] & CMDSTS_S) {
+        return EP_STALLED;
+    }
+
+    // Copy data to USB RAM
+    USBMemCopy((uint8_t *)endpointState[endpoint].buffer[bf], data, size);
+
+    // Add options
+    if (endpointState[endpoint].options & RATE_FEEDBACK_MODE) {
+        flags |= CMDSTS_RF;
+    }
+
+    if (endpointState[endpoint].options & ISOCHRONOUS) {
+        flags |= CMDSTS_T;
+    }
+
+    // Add transfer
+    ep[PHY_TO_LOG(endpoint)].in[bf] = CMDSTS_ADDRESS_OFFSET( \
+                                      endpointState[endpoint].buffer[bf]) \
+                                      | CMDSTS_NBYTES(size) | CMDSTS_A | flags;
+
+    return EP_PENDING;
+}
+
+EP_STATUS USBHAL::endpointWriteResult(uint8_t endpoint) {
+    uint32_t bf;
+    // Validate parameters
+
+    if (endpoint > LAST_PHYSICAL_ENDPOINT) {
+        return EP_INVALID;
+    }
+
+    if (OUT_EP(endpoint)) {
+        return EP_INVALID;
+    }
+
+    if (LPC_USB->EPBUFCFG & EP(endpoint)) {
+        // Double buffered     // TODO: FIX THIS
+        if (LPC_USB->EPINUSE & EP(endpoint)) {
+            bf = 1;
+        } else {
+            bf = 0;
+        }
+    } else {
+        // Single buffered
+        bf = 0;
+    }
+
+    // Check if endpoint still active
+    if (ep[PHY_TO_LOG(endpoint)].in[bf] & CMDSTS_A) {
+        return EP_PENDING;
+    }
+
+    // Check if stalled
+    if (ep[PHY_TO_LOG(endpoint)].in[bf] & CMDSTS_S) {
+        return EP_STALLED;
+    }
+
+    return EP_COMPLETED;
+}
+
+void USBHAL::stallEndpoint(uint8_t endpoint) {
+
+    // TODO: should this clear active bit?
+
+    if (IN_EP(endpoint)) {
+        ep[PHY_TO_LOG(endpoint)].in[0] |= CMDSTS_S;
+        ep[PHY_TO_LOG(endpoint)].in[1] |= CMDSTS_S;
+    } else {
+        ep[PHY_TO_LOG(endpoint)].out[0] |= CMDSTS_S;
+        ep[PHY_TO_LOG(endpoint)].out[1] |= CMDSTS_S;
+    }
+}
+
+void USBHAL::unstallEndpoint(uint8_t endpoint) {
+    if (LPC_USB->EPBUFCFG & EP(endpoint)) {
+        // Double buffered
+        if (IN_EP(endpoint)) {
+            ep[PHY_TO_LOG(endpoint)].in[0] = 0; // S = 0
+            ep[PHY_TO_LOG(endpoint)].in[1] = 0; // S = 0
+
+            if (LPC_USB->EPINUSE & EP(endpoint)) {
+                ep[PHY_TO_LOG(endpoint)].in[1] = CMDSTS_TR; // S =0, TR=1, TV = 0
+            } else {
+                ep[PHY_TO_LOG(endpoint)].in[0] = CMDSTS_TR; // S =0, TR=1, TV = 0
+            }
+        } else {
+            ep[PHY_TO_LOG(endpoint)].out[0] = 0; // S = 0
+            ep[PHY_TO_LOG(endpoint)].out[1] = 0; // S = 0
+
+            if (LPC_USB->EPINUSE & EP(endpoint)) {
+                ep[PHY_TO_LOG(endpoint)].out[1] = CMDSTS_TR; // S =0, TR=1, TV = 0
+            } else {
+                ep[PHY_TO_LOG(endpoint)].out[0] = CMDSTS_TR; // S =0, TR=1, TV = 0
+            }
+        }
+    } else {
+        // Single buffered
+        if (IN_EP(endpoint)) {
+            ep[PHY_TO_LOG(endpoint)].in[0] = CMDSTS_TR; // S=0, TR=1, TV = 0
+        } else {
+            ep[PHY_TO_LOG(endpoint)].out[0] = CMDSTS_TR; // S=0, TR=1, TV = 0
+        }
+    }
+}
+
+bool USBHAL::getEndpointStallState(unsigned char endpoint) {
+    if (IN_EP(endpoint)) {
+        if (LPC_USB->EPINUSE & EP(endpoint)) {
+            if (ep[PHY_TO_LOG(endpoint)].in[1] & CMDSTS_S) {
+                return true;
+            }
+        } else {
+            if (ep[PHY_TO_LOG(endpoint)].in[0] & CMDSTS_S) {
+                return true;
+            }
+        }
+    } else {
+        if (LPC_USB->EPINUSE & EP(endpoint)) {
+            if (ep[PHY_TO_LOG(endpoint)].out[1] & CMDSTS_S) {
+                return true;
+            }
+        } else {
+            if (ep[PHY_TO_LOG(endpoint)].out[0] & CMDSTS_S) {
+                return true;
+            }
+        }
+    }
+
+    return false;
+}
+
+bool USBHAL::realiseEndpoint(uint8_t endpoint, uint32_t maxPacket, uint32_t options) {
+    uint32_t tmpEpRamPtr;
+
+    if (endpoint > LAST_PHYSICAL_ENDPOINT) {
+        return false;
+    }
+
+    // Not applicable to the control endpoints
+    if ((endpoint==EP0IN) || (endpoint==EP0OUT)) {
+        return false;
+    }
+
+    // Allocate buffers in USB RAM
+    tmpEpRamPtr = epRamPtr;
+
+    // Must be 64 byte aligned
+    tmpEpRamPtr = ROUND_UP_TO_MULTIPLE(tmpEpRamPtr, 64);
+
+    if ((tmpEpRamPtr + maxPacket) > (USB_RAM_START + USB_RAM_SIZE)) {
+        // Out of memory
+        return false;
+    }
+
+    // Allocate first buffer
+    endpointState[endpoint].buffer[0] = tmpEpRamPtr;
+    tmpEpRamPtr += maxPacket;
+
+    if (!(options & SINGLE_BUFFERED)) {
+        // Must be 64 byte aligned
+        tmpEpRamPtr = ROUND_UP_TO_MULTIPLE(tmpEpRamPtr, 64);
+
+        if ((tmpEpRamPtr + maxPacket) > (USB_RAM_START + USB_RAM_SIZE)) {
+            // Out of memory
+            return false;
+        }
+
+        // Allocate second buffer
+        endpointState[endpoint].buffer[1] = tmpEpRamPtr;
+        tmpEpRamPtr += maxPacket;
+    }
+
+    // Commit to this USB RAM allocation
+    epRamPtr = tmpEpRamPtr;
+
+    // Remaining endpoint state values
+    endpointState[endpoint].maxPacket = maxPacket;
+    endpointState[endpoint].options = options;
+
+    // Enable double buffering if required
+    if (options & SINGLE_BUFFERED) {
+        LPC_USB->EPBUFCFG &= ~EP(endpoint);
+    } else {
+        // Double buffered
+        LPC_USB->EPBUFCFG |= EP(endpoint);
+    }
+
+    // Enable interrupt
+    LPC_USB->INTEN |= EP(endpoint);
+
+    // Enable endpoint
+    unstallEndpoint(endpoint);
+    return true;
+}
+
+void USBHAL::remoteWakeup(void) {
+    // Clearing DSUS bit initiates a remote wakeup if the
+    // device is currently enabled and suspended - otherwise
+    // it has no effect.
+    LPC_USB->DEVCMDSTAT = devCmdStat & ~DSUS;
+}
+
+
+static void disableEndpoints(void) {
+    uint32_t logEp;
+
+    // Ref. Table 158 "When a bus reset is received, software
+    // must set the disable bit of all endpoints to 1".
+
+    for (logEp = 1; logEp < NUMBER_OF_LOGICAL_ENDPOINTS; logEp++) {
+        ep[logEp].out[0] = CMDSTS_D;
+        ep[logEp].out[1] = CMDSTS_D;
+        ep[logEp].in[0] =  CMDSTS_D;
+        ep[logEp].in[1] =  CMDSTS_D;
+    }
+
+    // Start of USB RAM for endpoints > 0
+    epRamPtr = usbRamPtr;
+}
+
+
+
+void USBHAL::_usbisr(void) {
+    instance->usbisr();
+}
+
+void USBHAL::usbisr(void) {
+    // Start of frame
+    if (LPC_USB->INTSTAT & FRAME_INT) {
+        // Clear SOF interrupt
+        LPC_USB->INTSTAT = FRAME_INT;
+
+        // SOF event, read frame number
+        SOF(FRAME_NR(LPC_USB->INFO));
+    }
+
+    // Device state
+    if (LPC_USB->INTSTAT & DEV_INT) {
+        LPC_USB->INTSTAT = DEV_INT;
+
+        if (LPC_USB->DEVCMDSTAT & DSUS_C) {
+            // Suspend status changed
+            LPC_USB->DEVCMDSTAT = devCmdStat | DSUS_C;
+            if((LPC_USB->DEVCMDSTAT & DSUS) != 0) {
+                suspendStateChanged(1);
+            }
+        }
+
+        if (LPC_USB->DEVCMDSTAT & DRES_C) {
+            // Bus reset
+            LPC_USB->DEVCMDSTAT = devCmdStat | DRES_C;
+
+            suspendStateChanged(0);
+
+            // Disable endpoints > 0
+            disableEndpoints();
+
+            // Bus reset event
+            busReset();
+        }
+    }
+
+    // Endpoint 0
+    if (LPC_USB->INTSTAT & EP(EP0OUT)) {
+        // Clear EP0OUT/SETUP interrupt
+        LPC_USB->INTSTAT = EP(EP0OUT);
+
+        // Check if SETUP
+        if (LPC_USB->DEVCMDSTAT & SETUP) {
+            // Clear Active and Stall bits for EP0
+            // Documentation does not make it clear if we must use the
+            // EPSKIP register to achieve this, Fig. 16 and NXP reference
+            // code suggests we can just clear the Active bits - check with
+            // NXP to be sure.
+            ep[0].in[0] = 0;
+            ep[0].out[0] = 0;
+
+            // Clear EP0IN interrupt
+            LPC_USB->INTSTAT = EP(EP0IN);
+
+            // Clear SETUP (and INTONNAK_CI/O) in device status register
+            LPC_USB->DEVCMDSTAT = devCmdStat | SETUP;
+
+            // EP0 SETUP event (SETUP data received)
+            EP0setupCallback();
+        } else {
+            // EP0OUT ACK event (OUT data received)
+            EP0out();
+        }
+    }
+
+    if (LPC_USB->INTSTAT & EP(EP0IN)) {
+        // Clear EP0IN interrupt
+        LPC_USB->INTSTAT = EP(EP0IN);
+
+        // EP0IN ACK event (IN data sent)
+        EP0in();
+    }
+
+    if (LPC_USB->INTSTAT & EP(EP1IN)) {
+        // Clear EP1IN interrupt
+        LPC_USB->INTSTAT = EP(EP1IN);
+        epComplete |= EP(EP1IN);
+        if (EP1_IN_callback())
+            epComplete &= ~EP(EP1IN);
+    }
+
+    if (LPC_USB->INTSTAT & EP(EP1OUT)) {
+        // Clear EP1OUT interrupt
+        LPC_USB->INTSTAT = EP(EP1OUT);
+        epComplete |= EP(EP1OUT);
+        if (EP1_OUT_callback())
+            epComplete &= ~EP(EP1OUT);
+    }
+
+    if (LPC_USB->INTSTAT & EP(EP2IN)) {
+        // Clear EPBULK_IN interrupt
+        LPC_USB->INTSTAT = EP(EP2IN);
+        epComplete |= EP(EP2IN);
+        if (EP2_IN_callback())
+            epComplete &= ~EP(EP2IN);
+    }
+
+    if (LPC_USB->INTSTAT & EP(EP2OUT)) {
+        // Clear EPBULK_OUT interrupt
+        LPC_USB->INTSTAT = EP(EP2OUT);
+        epComplete |= EP(EP2OUT);
+        //Call callback function. If true, clear epComplete
+        if (EP2_OUT_callback())
+            epComplete &= ~EP(EP2OUT);
+    }
+
+    if (LPC_USB->INTSTAT & EP(EP3IN)) {
+        // Clear EP3_IN interrupt
+        LPC_USB->INTSTAT = EP(EP3IN);
+        epComplete |= EP(EP3IN);
+        if (EP3_IN_callback())
+            epComplete &= ~EP(EP3IN);
+    }
+
+    if (LPC_USB->INTSTAT & EP(EP3OUT)) {
+        // Clear EP3_OUT interrupt
+        LPC_USB->INTSTAT = EP(EP3OUT);
+        epComplete |= EP(EP3OUT);
+        //Call callback function. If true, clear epComplete
+        if (EP3_OUT_callback())
+            epComplete &= ~EP(EP3OUT);
+    }
+}
+
+#endif