Index: V-USB_Dev/firmwares/CrO2/usbdrv/usbdrv.c
===================================================================
--- V-USB_Dev/firmwares/CrO2/usbdrv/usbdrv.c	(revision 1fabcce0f751c00ce479b124a5b7ebde1bd8b81e)
+++ V-USB_Dev/firmwares/CrO2/usbdrv/usbdrv.c	(revision 1fabcce0f751c00ce479b124a5b7ebde1bd8b81e)
@@ -0,0 +1,625 @@
+/* Name: usbdrv.c
+ * Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
+ * Author: Christian Starkjohann
+ * Creation Date: 2004-12-29
+ * Tabsize: 4
+ * Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH
+ * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
+ * This Revision: $Id: usbdrv.c 791 2010-07-15 15:56:13Z cs $
+ */
+
+#include "usbportability.h"
+#include "usbdrv.h"
+#include "oddebug.h"
+
+/*
+General Description:
+This module implements the C-part of the USB driver. See usbdrv.h for a
+documentation of the entire driver.
+*/
+
+/* ------------------------------------------------------------------------- */
+
+/* raw USB registers / interface to assembler code: */
+uchar usbRxBuf[2*USB_BUFSIZE];  /* raw RX buffer: PID, 8 bytes data, 2 bytes CRC */
+uchar       usbInputBufOffset;  /* offset in usbRxBuf used for low level receiving */
+uchar       usbDeviceAddr;      /* assigned during enumeration, defaults to 0 */
+uchar       usbNewDeviceAddr;   /* device ID which should be set after status phase */
+uchar       usbConfiguration;   /* currently selected configuration. Administered by driver, but not used */
+volatile schar usbRxLen;        /* = 0; number of bytes in usbRxBuf; 0 means free, -1 for flow control */
+uchar       usbCurrentTok;      /* last token received or endpoint number for last OUT token if != 0 */
+uchar       usbRxToken;         /* token for data we received; or endpont number for last OUT */
+volatile uchar usbTxLen = USBPID_NAK;   /* number of bytes to transmit with next IN token or handshake token */
+uchar       usbTxBuf[USB_BUFSIZE];/* data to transmit with next IN, free if usbTxLen contains handshake token */
+#if USB_COUNT_SOF
+volatile uchar  usbSofCount;    /* incremented by assembler module every SOF */
+#endif
+#if USB_CFG_HAVE_INTRIN_ENDPOINT && !USB_CFG_SUPPRESS_INTR_CODE
+usbTxStatus_t  usbTxStatus1;
+#   if USB_CFG_HAVE_INTRIN_ENDPOINT3
+usbTxStatus_t  usbTxStatus3;
+#   endif
+#endif
+#if USB_CFG_CHECK_DATA_TOGGLING
+uchar       usbCurrentDataToken;/* when we check data toggling to ignore duplicate packets */
+#endif
+
+/* USB status registers / not shared with asm code */
+uchar               *usbMsgPtr;     /* data to transmit next -- ROM or RAM address */
+static usbMsgLen_t  usbMsgLen = USB_NO_MSG; /* remaining number of bytes */
+static uchar        usbMsgFlags;    /* flag values see below */
+
+#define USB_FLG_MSGPTR_IS_ROM   (1<<6)
+#define USB_FLG_USE_USER_RW     (1<<7)
+
+/*
+optimizing hints:
+- do not post/pre inc/dec integer values in operations
+- assign value of USB_READ_FLASH() to register variables and don't use side effects in arg
+- use narrow scope for variables which should be in X/Y/Z register
+- assign char sized expressions to variables to force 8 bit arithmetics
+*/
+
+/* -------------------------- String Descriptors --------------------------- */
+
+#if USB_CFG_DESCR_PROPS_STRINGS == 0
+
+#if USB_CFG_DESCR_PROPS_STRING_0 == 0
+#undef USB_CFG_DESCR_PROPS_STRING_0
+#define USB_CFG_DESCR_PROPS_STRING_0    sizeof(usbDescriptorString0)
+PROGMEM char usbDescriptorString0[] = { /* language descriptor */
+    4,          /* sizeof(usbDescriptorString0): length of descriptor in bytes */
+    3,          /* descriptor type */
+    0x09, 0x04, /* language index (0x0409 = US-English) */
+};
+#endif
+
+#if USB_CFG_DESCR_PROPS_STRING_VENDOR == 0 && USB_CFG_VENDOR_NAME_LEN
+#undef USB_CFG_DESCR_PROPS_STRING_VENDOR
+#define USB_CFG_DESCR_PROPS_STRING_VENDOR   sizeof(usbDescriptorStringVendor)
+PROGMEM int  usbDescriptorStringVendor[] = {
+    USB_STRING_DESCRIPTOR_HEADER(USB_CFG_VENDOR_NAME_LEN),
+    USB_CFG_VENDOR_NAME
+};
+#endif
+
+#if USB_CFG_DESCR_PROPS_STRING_PRODUCT == 0 && USB_CFG_DEVICE_NAME_LEN
+#undef USB_CFG_DESCR_PROPS_STRING_PRODUCT
+#define USB_CFG_DESCR_PROPS_STRING_PRODUCT   sizeof(usbDescriptorStringDevice)
+PROGMEM int  usbDescriptorStringDevice[] = {
+    USB_STRING_DESCRIPTOR_HEADER(USB_CFG_DEVICE_NAME_LEN),
+    USB_CFG_DEVICE_NAME
+};
+#endif
+
+#if USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER == 0 && USB_CFG_SERIAL_NUMBER_LEN
+#undef USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER
+#define USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER    sizeof(usbDescriptorStringSerialNumber)
+PROGMEM int usbDescriptorStringSerialNumber[] = {
+    USB_STRING_DESCRIPTOR_HEADER(USB_CFG_SERIAL_NUMBER_LEN),
+    USB_CFG_SERIAL_NUMBER
+};
+#endif
+
+#endif  /* USB_CFG_DESCR_PROPS_STRINGS == 0 */
+
+/* --------------------------- Device Descriptor --------------------------- */
+
+#if USB_CFG_DESCR_PROPS_DEVICE == 0
+#undef USB_CFG_DESCR_PROPS_DEVICE
+#define USB_CFG_DESCR_PROPS_DEVICE  sizeof(usbDescriptorDevice)
+PROGMEM char usbDescriptorDevice[] = {    /* USB device descriptor */
+    18,         /* sizeof(usbDescriptorDevice): length of descriptor in bytes */
+    USBDESCR_DEVICE,        /* descriptor type */
+    0x10, 0x01,             /* USB version supported */
+    USB_CFG_DEVICE_CLASS,
+    USB_CFG_DEVICE_SUBCLASS,
+    0,                      /* protocol */
+    8,                      /* max packet size */
+    /* the following two casts affect the first byte of the constant only, but
+     * that's sufficient to avoid a warning with the default values.
+     */
+    (char)USB_CFG_VENDOR_ID,/* 2 bytes */
+    (char)USB_CFG_DEVICE_ID,/* 2 bytes */
+    USB_CFG_DEVICE_VERSION, /* 2 bytes */
+    USB_CFG_DESCR_PROPS_STRING_VENDOR != 0 ? 1 : 0,         /* manufacturer string index */
+    USB_CFG_DESCR_PROPS_STRING_PRODUCT != 0 ? 2 : 0,        /* product string index */
+    USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER != 0 ? 3 : 0,  /* serial number string index */
+    1,          /* number of configurations */
+};
+#endif
+
+/* ----------------------- Configuration Descriptor ------------------------ */
+
+#if USB_CFG_DESCR_PROPS_HID_REPORT != 0 && USB_CFG_DESCR_PROPS_HID == 0
+#undef USB_CFG_DESCR_PROPS_HID
+#define USB_CFG_DESCR_PROPS_HID     9   /* length of HID descriptor in config descriptor below */
+#endif
+
+#if USB_CFG_DESCR_PROPS_CONFIGURATION == 0
+#undef USB_CFG_DESCR_PROPS_CONFIGURATION
+#define USB_CFG_DESCR_PROPS_CONFIGURATION   sizeof(usbDescriptorConfiguration)
+PROGMEM char usbDescriptorConfiguration[] = {    /* USB configuration descriptor */
+    9,          /* sizeof(usbDescriptorConfiguration): length of descriptor in bytes */
+    USBDESCR_CONFIG,    /* descriptor type */
+    18 + 7 * USB_CFG_HAVE_INTRIN_ENDPOINT + 7 * USB_CFG_HAVE_INTRIN_ENDPOINT3 +
+                (USB_CFG_DESCR_PROPS_HID & 0xff), 0,
+                /* total length of data returned (including inlined descriptors) */
+    1,          /* number of interfaces in this configuration */
+    1,          /* index of this configuration */
+    0,          /* configuration name string index */
+#if USB_CFG_IS_SELF_POWERED
+    (1 << 7) | USBATTR_SELFPOWER,       /* attributes */
+#else
+    (1 << 7),                           /* attributes */
+#endif
+    USB_CFG_MAX_BUS_POWER/2,            /* max USB current in 2mA units */
+/* interface descriptor follows inline: */
+    9,          /* sizeof(usbDescrInterface): length of descriptor in bytes */
+    USBDESCR_INTERFACE, /* descriptor type */
+    0,          /* index of this interface */
+    0,          /* alternate setting for this interface */
+    USB_CFG_HAVE_INTRIN_ENDPOINT + USB_CFG_HAVE_INTRIN_ENDPOINT3, /* endpoints excl 0: number of endpoint descriptors to follow */
+    USB_CFG_INTERFACE_CLASS,
+    USB_CFG_INTERFACE_SUBCLASS,
+    USB_CFG_INTERFACE_PROTOCOL,
+    0,          /* string index for interface */
+#if (USB_CFG_DESCR_PROPS_HID & 0xff)    /* HID descriptor */
+    9,          /* sizeof(usbDescrHID): length of descriptor in bytes */
+    USBDESCR_HID,   /* descriptor type: HID */
+    0x01, 0x01, /* BCD representation of HID version */
+    0x00,       /* target country code */
+    0x01,       /* number of HID Report (or other HID class) Descriptor infos to follow */
+    0x22,       /* descriptor type: report */
+    USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH, 0,  /* total length of report descriptor */
+#endif
+#if USB_CFG_HAVE_INTRIN_ENDPOINT    /* endpoint descriptor for endpoint 1 */
+    7,          /* sizeof(usbDescrEndpoint) */
+    USBDESCR_ENDPOINT,  /* descriptor type = endpoint */
+    (char)0x81, /* IN endpoint number 1 */
+    0x03,       /* attrib: Interrupt endpoint */
+    8, 0,       /* maximum packet size */
+    USB_CFG_INTR_POLL_INTERVAL, /* in ms */
+#endif
+#if USB_CFG_HAVE_INTRIN_ENDPOINT3   /* endpoint descriptor for endpoint 3 */
+    7,          /* sizeof(usbDescrEndpoint) */
+    USBDESCR_ENDPOINT,  /* descriptor type = endpoint */
+    (char)(0x80 | USB_CFG_EP3_NUMBER), /* IN endpoint number 3 */
+    0x03,       /* attrib: Interrupt endpoint */
+    8, 0,       /* maximum packet size */
+    USB_CFG_INTR_POLL_INTERVAL, /* in ms */
+#endif
+};
+#endif
+
+/* ------------------------------------------------------------------------- */
+
+static inline void  usbResetDataToggling(void)
+{
+#if USB_CFG_HAVE_INTRIN_ENDPOINT && !USB_CFG_SUPPRESS_INTR_CODE
+    USB_SET_DATATOKEN1(USB_INITIAL_DATATOKEN);  /* reset data toggling for interrupt endpoint */
+#   if USB_CFG_HAVE_INTRIN_ENDPOINT3
+    USB_SET_DATATOKEN3(USB_INITIAL_DATATOKEN);  /* reset data toggling for interrupt endpoint */
+#   endif
+#endif
+}
+
+static inline void  usbResetStall(void)
+{
+#if USB_CFG_IMPLEMENT_HALT && USB_CFG_HAVE_INTRIN_ENDPOINT
+        usbTxLen1 = USBPID_NAK;
+#if USB_CFG_HAVE_INTRIN_ENDPOINT3
+        usbTxLen3 = USBPID_NAK;
+#endif
+#endif
+}
+
+/* ------------------------------------------------------------------------- */
+
+#if !USB_CFG_SUPPRESS_INTR_CODE
+#if USB_CFG_HAVE_INTRIN_ENDPOINT
+static void usbGenericSetInterrupt(uchar *data, uchar len, usbTxStatus_t *txStatus)
+{
+uchar   *p;
+char    i;
+
+#if USB_CFG_IMPLEMENT_HALT
+    if(usbTxLen1 == USBPID_STALL)
+        return;
+#endif
+    if(txStatus->len & 0x10){   /* packet buffer was empty */
+        txStatus->buffer[0] ^= USBPID_DATA0 ^ USBPID_DATA1; /* toggle token */
+    }else{
+        txStatus->len = USBPID_NAK; /* avoid sending outdated (overwritten) interrupt data */
+    }
+    p = txStatus->buffer + 1;
+    i = len;
+    do{                         /* if len == 0, we still copy 1 byte, but that's no problem */
+        *p++ = *data++;
+    }while(--i > 0);            /* loop control at the end is 2 bytes shorter than at beginning */
+    usbCrc16Append(&txStatus->buffer[1], len);
+    txStatus->len = len + 4;    /* len must be given including sync byte */
+    DBG2(0x21 + (((int)txStatus >> 3) & 3), txStatus->buffer, len + 3);
+}
+
+USB_PUBLIC void usbSetInterrupt(uchar *data, uchar len)
+{
+    usbGenericSetInterrupt(data, len, &usbTxStatus1);
+}
+#endif
+
+#if USB_CFG_HAVE_INTRIN_ENDPOINT3
+USB_PUBLIC void usbSetInterrupt3(uchar *data, uchar len)
+{
+    usbGenericSetInterrupt(data, len, &usbTxStatus3);
+}
+#endif
+#endif /* USB_CFG_SUPPRESS_INTR_CODE */
+
+/* ------------------ utilities for code following below ------------------- */
+
+/* Use defines for the switch statement so that we can choose between an
+ * if()else if() and a switch/case based implementation. switch() is more
+ * efficient for a LARGE set of sequential choices, if() is better in all other
+ * cases.
+ */
+#if USB_CFG_USE_SWITCH_STATEMENT
+#   define SWITCH_START(cmd)       switch(cmd){{
+#   define SWITCH_CASE(value)      }break; case (value):{
+#   define SWITCH_CASE2(v1,v2)     }break; case (v1): case(v2):{
+#   define SWITCH_CASE3(v1,v2,v3)  }break; case (v1): case(v2): case(v3):{
+#   define SWITCH_DEFAULT          }break; default:{
+#   define SWITCH_END              }}
+#else
+#   define SWITCH_START(cmd)       {uchar _cmd = cmd; if(0){
+#   define SWITCH_CASE(value)      }else if(_cmd == (value)){
+#   define SWITCH_CASE2(v1,v2)     }else if(_cmd == (v1) || _cmd == (v2)){
+#   define SWITCH_CASE3(v1,v2,v3)  }else if(_cmd == (v1) || _cmd == (v2) || (_cmd == v3)){
+#   define SWITCH_DEFAULT          }else{
+#   define SWITCH_END              }}
+#endif
+
+#ifndef USB_RX_USER_HOOK
+#define USB_RX_USER_HOOK(data, len)
+#endif
+#ifndef USB_SET_ADDRESS_HOOK
+#define USB_SET_ADDRESS_HOOK()
+#endif
+
+/* ------------------------------------------------------------------------- */
+
+/* We use if() instead of #if in the macro below because #if can't be used
+ * in macros and the compiler optimizes constant conditions anyway.
+ * This may cause problems with undefined symbols if compiled without
+ * optimizing!
+ */
+#define GET_DESCRIPTOR(cfgProp, staticName)         \
+    if(cfgProp){                                    \
+        if((cfgProp) & USB_PROP_IS_RAM)             \
+            flags = 0;                              \
+        if((cfgProp) & USB_PROP_IS_DYNAMIC){        \
+            len = usbFunctionDescriptor(rq);        \
+        }else{                                      \
+            len = USB_PROP_LENGTH(cfgProp);         \
+            usbMsgPtr = (uchar *)(staticName);      \
+        }                                           \
+    }
+
+/* usbDriverDescriptor() is similar to usbFunctionDescriptor(), but used
+ * internally for all types of descriptors.
+ */
+static inline usbMsgLen_t usbDriverDescriptor(usbRequest_t *rq)
+{
+usbMsgLen_t len = 0;
+uchar       flags = USB_FLG_MSGPTR_IS_ROM;
+
+    SWITCH_START(rq->wValue.bytes[1])
+    SWITCH_CASE(USBDESCR_DEVICE)    /* 1 */
+        GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_DEVICE, usbDescriptorDevice)
+    SWITCH_CASE(USBDESCR_CONFIG)    /* 2 */
+        GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_CONFIGURATION, usbDescriptorConfiguration)
+    SWITCH_CASE(USBDESCR_STRING)    /* 3 */
+#if USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC
+        if(USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_RAM)
+            flags = 0;
+        len = usbFunctionDescriptor(rq);
+#else   /* USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC */
+        SWITCH_START(rq->wValue.bytes[0])
+        SWITCH_CASE(0)
+            GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_0, usbDescriptorString0)
+        SWITCH_CASE(1)
+            GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_VENDOR, usbDescriptorStringVendor)
+        SWITCH_CASE(2)
+            GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_PRODUCT, usbDescriptorStringDevice)
+        SWITCH_CASE(3)
+            GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER, usbDescriptorStringSerialNumber)
+        SWITCH_DEFAULT
+            if(USB_CFG_DESCR_PROPS_UNKNOWN & USB_PROP_IS_DYNAMIC){
+                len = usbFunctionDescriptor(rq);
+            }
+        SWITCH_END
+#endif  /* USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC */
+#if USB_CFG_DESCR_PROPS_HID_REPORT  /* only support HID descriptors if enabled */
+    SWITCH_CASE(USBDESCR_HID)       /* 0x21 */
+        GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_HID, usbDescriptorConfiguration + 18)
+    SWITCH_CASE(USBDESCR_HID_REPORT)/* 0x22 */
+        GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_HID_REPORT, usbDescriptorHidReport)
+#endif
+    SWITCH_DEFAULT
+        if(USB_CFG_DESCR_PROPS_UNKNOWN & USB_PROP_IS_DYNAMIC){
+            len = usbFunctionDescriptor(rq);
+        }
+    SWITCH_END
+    usbMsgFlags = flags;
+    return len;
+}
+
+/* ------------------------------------------------------------------------- */
+
+/* usbDriverSetup() is similar to usbFunctionSetup(), but it's used for
+ * standard requests instead of class and custom requests.
+ */
+static inline usbMsgLen_t usbDriverSetup(usbRequest_t *rq)
+{
+uchar   len  = 0, *dataPtr = usbTxBuf + 9;  /* there are 2 bytes free space at the end of the buffer */
+uchar   value = rq->wValue.bytes[0];
+#if USB_CFG_IMPLEMENT_HALT
+uchar   index = rq->wIndex.bytes[0];
+#endif
+
+    dataPtr[0] = 0; /* default reply common to USBRQ_GET_STATUS and USBRQ_GET_INTERFACE */
+    SWITCH_START(rq->bRequest)
+    SWITCH_CASE(USBRQ_GET_STATUS)           /* 0 */
+        uchar recipient = rq->bmRequestType & USBRQ_RCPT_MASK;  /* assign arith ops to variables to enforce byte size */
+        if(USB_CFG_IS_SELF_POWERED && recipient == USBRQ_RCPT_DEVICE)
+            dataPtr[0] =  USB_CFG_IS_SELF_POWERED;
+#if USB_CFG_IMPLEMENT_HALT
+        if(recipient == USBRQ_RCPT_ENDPOINT && index == 0x81)   /* request status for endpoint 1 */
+            dataPtr[0] = usbTxLen1 == USBPID_STALL;
+#endif
+        dataPtr[1] = 0;
+        len = 2;
+#if USB_CFG_IMPLEMENT_HALT
+    SWITCH_CASE2(USBRQ_CLEAR_FEATURE, USBRQ_SET_FEATURE)    /* 1, 3 */
+        if(value == 0 && index == 0x81){    /* feature 0 == HALT for endpoint == 1 */
+            usbTxLen1 = rq->bRequest == USBRQ_CLEAR_FEATURE ? USBPID_NAK : USBPID_STALL;
+            usbResetDataToggling();
+        }
+#endif
+    SWITCH_CASE(USBRQ_SET_ADDRESS)          /* 5 */
+        usbNewDeviceAddr = value;
+        USB_SET_ADDRESS_HOOK();
+    SWITCH_CASE(USBRQ_GET_DESCRIPTOR)       /* 6 */
+        len = usbDriverDescriptor(rq);
+        goto skipMsgPtrAssignment;
+    SWITCH_CASE(USBRQ_GET_CONFIGURATION)    /* 8 */
+        dataPtr = &usbConfiguration;  /* send current configuration value */
+        len = 1;
+    SWITCH_CASE(USBRQ_SET_CONFIGURATION)    /* 9 */
+        usbConfiguration = value;
+        usbResetStall();
+    SWITCH_CASE(USBRQ_GET_INTERFACE)        /* 10 */
+        len = 1;
+#if USB_CFG_HAVE_INTRIN_ENDPOINT && !USB_CFG_SUPPRESS_INTR_CODE
+    SWITCH_CASE(USBRQ_SET_INTERFACE)        /* 11 */
+        usbResetDataToggling();
+        usbResetStall();
+#endif
+    SWITCH_DEFAULT                          /* 7=SET_DESCRIPTOR, 12=SYNC_FRAME */
+        /* Should we add an optional hook here? */
+    SWITCH_END
+    usbMsgPtr = dataPtr;
+skipMsgPtrAssignment:
+    return len;
+}
+
+/* ------------------------------------------------------------------------- */
+
+/* usbProcessRx() is called for every message received by the interrupt
+ * routine. It distinguishes between SETUP and DATA packets and processes
+ * them accordingly.
+ */
+static inline void usbProcessRx(uchar *data, uchar len)
+{
+usbRequest_t    *rq = (void *)data;
+
+/* usbRxToken can be:
+ * 0x2d 00101101 (USBPID_SETUP for setup data)
+ * 0xe1 11100001 (USBPID_OUT: data phase of setup transfer)
+ * 0...0x0f for OUT on endpoint X
+ */
+    DBG2(0x10 + (usbRxToken & 0xf), data, len + 2); /* SETUP=1d, SETUP-DATA=11, OUTx=1x */
+    USB_RX_USER_HOOK(data, len)
+#if USB_CFG_IMPLEMENT_FN_WRITEOUT
+    if(usbRxToken < 0x10){  /* OUT to endpoint != 0: endpoint number in usbRxToken */
+        usbFunctionWriteOut(data, len);
+        return;
+    }
+#endif
+    if(usbRxToken == (uchar)USBPID_SETUP){
+        if(len != 8)    /* Setup size must be always 8 bytes. Ignore otherwise. */
+            return;
+        usbMsgLen_t replyLen;
+        usbTxBuf[0] = USBPID_DATA0;         /* initialize data toggling */
+        usbTxLen = USBPID_NAK;              /* abort pending transmit */
+        usbMsgFlags = 0;
+        uchar type = rq->bmRequestType & USBRQ_TYPE_MASK;
+        if(type != USBRQ_TYPE_STANDARD){    /* standard requests are handled by driver */
+            replyLen = usbFunctionSetup(data);
+        }else{
+            replyLen = usbDriverSetup(rq);
+        }
+#if USB_CFG_IMPLEMENT_FN_READ || USB_CFG_IMPLEMENT_FN_WRITE
+        if(replyLen == USB_NO_MSG){         /* use user-supplied read/write function */
+            /* do some conditioning on replyLen, but on IN transfers only */
+            if((rq->bmRequestType & USBRQ_DIR_MASK) != USBRQ_DIR_HOST_TO_DEVICE){
+                if(sizeof(replyLen) < sizeof(rq->wLength.word)){ /* help compiler with optimizing */
+                    replyLen = rq->wLength.bytes[0];
+                }else{
+                    replyLen = rq->wLength.word;
+                }
+            }
+            usbMsgFlags = USB_FLG_USE_USER_RW;
+        }else   /* The 'else' prevents that we limit a replyLen of USB_NO_MSG to the maximum transfer len. */
+#endif
+        if(sizeof(replyLen) < sizeof(rq->wLength.word)){ /* help compiler with optimizing */
+            if(!rq->wLength.bytes[1] && replyLen > rq->wLength.bytes[0])    /* limit length to max */
+                replyLen = rq->wLength.bytes[0];
+        }else{
+            if(replyLen > rq->wLength.word)     /* limit length to max */
+                replyLen = rq->wLength.word;
+        }
+        usbMsgLen = replyLen;
+    }else{  /* usbRxToken must be USBPID_OUT, which means data phase of setup (control-out) */
+#if USB_CFG_IMPLEMENT_FN_WRITE
+        if(usbMsgFlags & USB_FLG_USE_USER_RW){
+            uchar rval = usbFunctionWrite(data, len);
+            if(rval == 0xff){   /* an error occurred */
+                usbTxLen = USBPID_STALL;
+            }else if(rval != 0){    /* This was the final package */
+                usbMsgLen = 0;  /* answer with a zero-sized data packet */
+            }
+        }
+#endif
+    }
+}
+
+/* ------------------------------------------------------------------------- */
+
+/* This function is similar to usbFunctionRead(), but it's also called for
+ * data handled automatically by the driver (e.g. descriptor reads).
+ */
+static uchar usbDeviceRead(uchar *data, uchar len)
+{
+    if(len > 0){    /* don't bother app with 0 sized reads */
+#if USB_CFG_IMPLEMENT_FN_READ
+        if(usbMsgFlags & USB_FLG_USE_USER_RW){
+            len = usbFunctionRead(data, len);
+        }else
+#endif
+        {
+            uchar i = len, *r = usbMsgPtr;
+            if(usbMsgFlags & USB_FLG_MSGPTR_IS_ROM){    /* ROM data */
+                do{
+                    uchar c = USB_READ_FLASH(r);    /* assign to char size variable to enforce byte ops */
+                    *data++ = c;
+                    r++;
+                }while(--i);
+            }else{  /* RAM data */
+                do{
+                    *data++ = *r++;
+                }while(--i);
+            }
+            usbMsgPtr = r;
+        }
+    }
+    return len;
+}
+
+/* ------------------------------------------------------------------------- */
+
+/* usbBuildTxBlock() is called when we have data to transmit and the
+ * interrupt routine's transmit buffer is empty.
+ */
+static inline void usbBuildTxBlock(void)
+{
+usbMsgLen_t wantLen;
+uchar       len;
+
+    wantLen = usbMsgLen;
+    if(wantLen > 8)
+        wantLen = 8;
+    usbMsgLen -= wantLen;
+    usbTxBuf[0] ^= USBPID_DATA0 ^ USBPID_DATA1; /* DATA toggling */
+    len = usbDeviceRead(usbTxBuf + 1, wantLen);
+    if(len <= 8){           /* valid data packet */
+        usbCrc16Append(&usbTxBuf[1], len);
+        len += 4;           /* length including sync byte */
+        if(len < 12)        /* a partial package identifies end of message */
+            usbMsgLen = USB_NO_MSG;
+    }else{
+        len = USBPID_STALL;   /* stall the endpoint */
+        usbMsgLen = USB_NO_MSG;
+    }
+    usbTxLen = len;
+    DBG2(0x20, usbTxBuf, len-1);
+}
+
+/* ------------------------------------------------------------------------- */
+
+static inline void usbHandleResetHook(uchar notResetState)
+{
+#ifdef USB_RESET_HOOK
+static uchar    wasReset;
+uchar           isReset = !notResetState;
+
+    if(wasReset != isReset){
+        USB_RESET_HOOK(isReset);
+        wasReset = isReset;
+    }
+#endif
+}
+
+/* ------------------------------------------------------------------------- */
+
+USB_PUBLIC void usbPoll(void)
+{
+schar   len;
+uchar   i;
+
+    len = usbRxLen - 3;
+    if(len >= 0){
+/* We could check CRC16 here -- but ACK has already been sent anyway. If you
+ * need data integrity checks with this driver, check the CRC in your app
+ * code and report errors back to the host. Since the ACK was already sent,
+ * retries must be handled on application level.
+ * unsigned crc = usbCrc16(buffer + 1, usbRxLen - 3);
+ */
+        usbProcessRx(usbRxBuf + USB_BUFSIZE + 1 - usbInputBufOffset, len);
+#if USB_CFG_HAVE_FLOWCONTROL
+        if(usbRxLen > 0)    /* only mark as available if not inactivated */
+            usbRxLen = 0;
+#else
+        usbRxLen = 0;       /* mark rx buffer as available */
+#endif
+    }
+    if(usbTxLen & 0x10){    /* transmit system idle */
+        if(usbMsgLen != USB_NO_MSG){    /* transmit data pending? */
+            usbBuildTxBlock();
+        }
+    }
+    for(i = 20; i > 0; i--){
+        uchar usbLineStatus = USBIN & USBMASK;
+        if(usbLineStatus != 0)  /* SE0 has ended */
+            goto isNotReset;
+    }
+    /* RESET condition, called multiple times during reset */
+    usbNewDeviceAddr = 0;
+    usbDeviceAddr = 0;
+    usbResetStall();
+    DBG1(0xff, 0, 0);
+isNotReset:
+    usbHandleResetHook(i);
+}
+
+/* ------------------------------------------------------------------------- */
+
+USB_PUBLIC void usbInit(void)
+{
+#if USB_INTR_CFG_SET != 0
+    USB_INTR_CFG |= USB_INTR_CFG_SET;
+#endif
+#if USB_INTR_CFG_CLR != 0
+    USB_INTR_CFG &= ~(USB_INTR_CFG_CLR);
+#endif
+    USB_INTR_ENABLE |= (1 << USB_INTR_ENABLE_BIT);
+    usbResetDataToggling();
+#if USB_CFG_HAVE_INTRIN_ENDPOINT && !USB_CFG_SUPPRESS_INTR_CODE
+    usbTxLen1 = USBPID_NAK;
+#if USB_CFG_HAVE_INTRIN_ENDPOINT3
+    usbTxLen3 = USBPID_NAK;
+#endif
+#endif
+}
+
+/* ------------------------------------------------------------------------- */
