/* 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 763 2009-08-22 10:27:24Z 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 const 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 const 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 const 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 const 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 const 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)0x83, /* IN endpoint number 1 */ 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 = (usbRequest_t *)((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 } /* ------------------------------------------------------------------------- */