/* Name: usbdrv.c * Project: AVR USB driver * 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) or proprietary (CommercialLicense.txt) * This Revision: $Id: usbdrv.c 530 2008-02-28 15:34:04Z cs $ */ #include "iarcompat.h" #ifndef __IAR_SYSTEMS_ICC__ # include # include #endif #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 */ uchar usbMsgLen = 0xff; /* remaining number of bytes, no msg to send if -1 (see usbMsgPtr) */ 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 volatile uchar usbTxLen1 = USBPID_NAK; /* TX count for endpoint 1 */ uchar usbTxBuf1[USB_BUFSIZE]; /* TX data for endpoint 1 */ # if USB_CFG_HAVE_INTRIN_ENDPOINT3 volatile uchar usbTxLen3 = USBPID_NAK; /* TX count for endpoint 3 */ uchar usbTxBuf3[USB_BUFSIZE]; /* TX data for endpoint 3 */ # endif #endif /* USB status registers / not shared with asm code */ uchar *usbMsgPtr; /* data to transmit next -- ROM or RAM address */ static uchar usbMsgFlags; /* flag values see below */ #define USB_FLG_TX_PACKET (1<<0) /* Leave free 6 bits after TX_PACKET. This way we can increment usbMsgFlags to toggle TX_PACKET */ #define USB_FLG_MSGPTR_IS_ROM (1<<6) #define USB_FLG_USE_DEFAULT_RW (1<<7) /* optimizing hints: - do not post/pre inc/dec integer values in operations - assign value of PRG_RDB() 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 */ /* ------------------------------------------------------------------------- */ #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 const int usbDescriptorStringSerialNumber[] = { USB_STRING_DESCRIPTOR_HEADER(USB_CFG_SERIAL_NUMBER_LEN), USB_CFG_SERIAL_NUMBER }; #endif #endif /* USB_CFG_DESCR_PROPS_STRINGS == 0 */ #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 #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 + (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 USBATTR_SELFPOWER, /* attributes */ #else (char)USBATTR_BUSPOWER, /* 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, /* 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 }; #endif /* We don't use prog_int or prog_int16_t for compatibility with various libc * versions. Here's an other compatibility hack: */ #ifndef PRG_RDB #define PRG_RDB(addr) pgm_read_byte(addr) #endif typedef union{ unsigned word; uchar *ptr; uchar bytes[2]; }converter_t; /* We use this union to do type conversions. This is better optimized than * type casts in gcc 3.4.3 and much better than using bit shifts to build * ints from chars. Byte ordering is not a problem on an 8 bit platform. */ /* ------------------------------------------------------------------------- */ static inline void usbResetDataToggling(void) { #if USB_CFG_HAVE_INTRIN_ENDPOINT 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_HAVE_INTRIN_ENDPOINT USB_PUBLIC void usbSetInterrupt(uchar *data, uchar len) { uchar *p, i; #if USB_CFG_IMPLEMENT_HALT if(usbTxLen1 == USBPID_STALL) return; #endif #if 0 /* No runtime checks! Caller is responsible for valid data! */ if(len > 8) /* interrupt transfers are limited to 8 bytes */ len = 8; #endif if(usbTxLen1 & 0x10){ /* packet buffer was empty */ usbTxBuf1[0] ^= USBPID_DATA0 ^ USBPID_DATA1; /* toggle token */ }else{ usbTxLen1 = USBPID_NAK; /* avoid sending outdated (overwritten) interrupt data */ } p = usbTxBuf1 + 1; for(i=len;i--;) *p++ = *data++; usbCrc16Append(&usbTxBuf1[1], len); usbTxLen1 = len + 4; /* len must be given including sync byte */ DBG2(0x21, usbTxBuf1, len + 3); } #endif #if USB_CFG_HAVE_INTRIN_ENDPOINT3 USB_PUBLIC void usbSetInterrupt3(uchar *data, uchar len) { uchar *p, i; if(usbTxLen3 & 0x10){ /* packet buffer was empty */ usbTxBuf3[0] ^= USBPID_DATA0 ^ USBPID_DATA1; /* toggle token */ }else{ usbTxLen3 = USBPID_NAK; /* avoid sending outdated (overwritten) interrupt data */ } p = usbTxBuf3 + 1; for(i=len;i--;) *p++ = *data++; usbCrc16Append(&usbTxBuf3[1], len); usbTxLen3 = len + 4; /* len must be given including sync byte */ DBG2(0x23, usbTxBuf3, len + 3); } #endif static uchar usbRead(uchar *data, uchar len) { #if USB_CFG_IMPLEMENT_FN_READ if(usbMsgFlags & USB_FLG_USE_DEFAULT_RW){ #endif uchar i = len, *r = usbMsgPtr; if(usbMsgFlags & USB_FLG_MSGPTR_IS_ROM){ /* ROM data */ while(i--){ uchar c = PRG_RDB(r); /* assign to char size variable to enforce byte ops */ *data++ = c; r++; } }else{ /* RAM data */ while(i--) *data++ = *r++; } usbMsgPtr = r; return len; #if USB_CFG_IMPLEMENT_FN_READ }else{ if(len != 0) /* don't bother app with 0 sized reads */ return usbFunctionRead(data, len); return 0; } #endif } #define GET_DESCRIPTOR(cfgProp, staticName) \ if(cfgProp){ \ if((cfgProp) & USB_PROP_IS_RAM) \ flags &= ~USB_FLG_MSGPTR_IS_ROM; \ if((cfgProp) & USB_PROP_IS_DYNAMIC){ \ replyLen = usbFunctionDescriptor(rq); \ }else{ \ replyData = (uchar *)(staticName); \ SET_REPLY_LEN((cfgProp) & 0xff); \ } \ } /* We use if() instead of #if in the macro above because #if can't be used * in macros and the compiler optimizes constant conditions anyway. */ /* Don't make this function static to avoid inlining. * The entire function would become too large and exceed the range of * relative jumps. * 2006-02-25: Either gcc 3.4.3 is better than the gcc used when the comment * above was written, or other parts of the code have changed. We now get * better results with an inlined function. Test condition: PowerSwitch code. */ static void usbProcessRx(uchar *data, uchar len) { usbRequest_t *rq = (usbRequest_t *)((void *)data); uchar replyLen = 0, flags = USB_FLG_USE_DEFAULT_RW; /* We use if() cascades because the compare is done byte-wise while switch() * is int-based. The if() cascades are therefore more efficient. */ /* usbRxToken can be: * 0x2d 00101101 (USBPID_SETUP for endpoint 0) * 0xe1 11100001 (USBPID_OUT for endpoint 0) * 0xff 11111111 (USBPID_OUT for endpoint 1) */ DBG2(0x10 + ((usbRxToken >> 1) & 3), data, len); /* SETUP0=12; OUT0=10; OUT1=13 */ #ifdef USB_RX_USER_HOOK USB_RX_USER_HOOK(data, len) #endif #if USB_CFG_IMPLEMENT_FN_WRITEOUT if(usbRxToken < 0x10){ /* endpoint number in usbRxToken */ usbFunctionWriteOut(data, len); return; /* no reply expected, hence no usbMsgPtr, usbMsgFlags, usbMsgLen set */ } #endif if(usbRxToken == (uchar)USBPID_SETUP){ usbTxLen = USBPID_NAK; /* abort pending transmit */ if(len == 8){ /* Setup size must be always 8 bytes. Ignore otherwise. */ uchar type = rq->bmRequestType & USBRQ_TYPE_MASK; if(type == USBRQ_TYPE_STANDARD){ #define SET_REPLY_LEN(len) replyLen = (len); usbMsgPtr = replyData /* This macro ensures that replyLen and usbMsgPtr are always set in the same way. * That allows optimization of common code in if() branches */ uchar *replyData = usbTxBuf + 9; /* there is 3 bytes free space at the end of the buffer */ replyData[0] = 0; /* common to USBRQ_GET_STATUS and USBRQ_GET_INTERFACE */ if(rq->bRequest == USBRQ_GET_STATUS){ /* 0 */ uchar __attribute__((__unused__)) recipient = rq->bmRequestType & USBRQ_RCPT_MASK; /* assign arith ops to variables to enforce byte size */ #if USB_CFG_IS_SELF_POWERED if(recipient == USBRQ_RCPT_DEVICE) replyData[0] = USB_CFG_IS_SELF_POWERED; #endif #if USB_CFG_HAVE_INTRIN_ENDPOINT && USB_CFG_IMPLEMENT_HALT if(recipient == USBRQ_RCPT_ENDPOINT && rq->wIndex.bytes[0] == 0x81) /* request status for endpoint 1 */ replyData[0] = usbTxLen1 == USBPID_STALL; #endif replyData[1] = 0; SET_REPLY_LEN(2); }else if(rq->bRequest == USBRQ_SET_ADDRESS){ /* 5 */ usbNewDeviceAddr = rq->wValue.bytes[0]; #ifdef USB_SET_ADDRESS_HOOK USB_SET_ADDRESS_HOOK(); #endif }else if(rq->bRequest == USBRQ_GET_DESCRIPTOR){ /* 6 */ flags = USB_FLG_MSGPTR_IS_ROM | USB_FLG_USE_DEFAULT_RW; if(rq->wValue.bytes[1] == USBDESCR_DEVICE){ /* 1 */ GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_DEVICE, usbDescriptorDevice) }else if(rq->wValue.bytes[1] == USBDESCR_CONFIG){ /* 2 */ GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_CONFIGURATION, usbDescriptorConfiguration) }else if(rq->wValue.bytes[1] == USBDESCR_STRING){ /* 3 */ #if USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC if(USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_RAM) flags &= ~USB_FLG_MSGPTR_IS_ROM; replyLen = usbFunctionDescriptor(rq); #else /* USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC */ if(rq->wValue.bytes[0] == 0){ /* descriptor index */ GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_0, usbDescriptorString0) }else if(rq->wValue.bytes[0] == 1){ GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_VENDOR, usbDescriptorStringVendor) }else if(rq->wValue.bytes[0] == 2){ GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_PRODUCT, usbDescriptorStringDevice) }else if(rq->wValue.bytes[0] == 3){ GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER, usbDescriptorStringSerialNumber) }else if(USB_CFG_DESCR_PROPS_UNKNOWN & USB_PROP_IS_DYNAMIC){ replyLen = usbFunctionDescriptor(rq); } #endif /* USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC */ #if USB_CFG_DESCR_PROPS_HID_REPORT /* only support HID descriptors if enabled */ }else if(rq->wValue.bytes[1] == USBDESCR_HID){ /* 0x21 */ GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_HID, usbDescriptorConfiguration + 18) }else if(rq->wValue.bytes[1] == USBDESCR_HID_REPORT){ /* 0x22 */ GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_HID_REPORT, usbDescriptorHidReport) #endif /* USB_CFG_DESCR_PROPS_HID_REPORT */ }else if(USB_CFG_DESCR_PROPS_UNKNOWN & USB_PROP_IS_DYNAMIC){ replyLen = usbFunctionDescriptor(rq); } }else if(rq->bRequest == USBRQ_GET_CONFIGURATION){ /* 8 */ replyData = &usbConfiguration; /* send current configuration value */ SET_REPLY_LEN(1); }else if(rq->bRequest == USBRQ_SET_CONFIGURATION){ /* 9 */ usbConfiguration = rq->wValue.bytes[0]; usbResetStall(); }else if(rq->bRequest == USBRQ_GET_INTERFACE){ /* 10 */ SET_REPLY_LEN(1); #if USB_CFG_HAVE_INTRIN_ENDPOINT }else if(rq->bRequest == USBRQ_SET_INTERFACE){ /* 11 */ usbResetDataToggling(); usbResetStall(); # if USB_CFG_IMPLEMENT_HALT }else if(rq->bRequest == USBRQ_CLEAR_FEATURE || rq->bRequest == USBRQ_SET_FEATURE){ /* 1|3 */ if(rq->wValue.bytes[0] == 0 && rq->wIndex.bytes[0] == 0x81){ /* feature 0 == HALT for endpoint == 1 */ usbTxLen1 = rq->bRequest == USBRQ_CLEAR_FEATURE ? USBPID_NAK : USBPID_STALL; usbResetDataToggling(); } # endif #endif }else{ /* the following requests can be ignored, send default reply */ /* 1: CLEAR_FEATURE, 3: SET_FEATURE, 7: SET_DESCRIPTOR */ /* 12: SYNCH_FRAME */ } #undef SET_REPLY_LEN }else{ /* not a standard request -- must be vendor or class request */ replyLen = usbFunctionSetup(data); } #if USB_CFG_IMPLEMENT_FN_READ || USB_CFG_IMPLEMENT_FN_WRITE if(replyLen == 0xff){ /* use user-supplied read/write function */ if((rq->bmRequestType & USBRQ_DIR_MASK) == USBRQ_DIR_DEVICE_TO_HOST){ replyLen = rq->wLength.bytes[0]; /* IN transfers only */ } flags &= ~USB_FLG_USE_DEFAULT_RW; /* we have no valid msg, use user supplied read/write functions */ }else /* The 'else' prevents that we limit a replyLen of 0xff to the maximum transfer len. */ #endif if(!rq->wLength.bytes[1] && replyLen > rq->wLength.bytes[0]) /* limit length to max */ replyLen = rq->wLength.bytes[0]; } /* make sure that data packets which are sent as ACK to an OUT transfer are always zero sized */ }else{ /* DATA packet from out request */ #if USB_CFG_IMPLEMENT_FN_WRITE if(!(usbMsgFlags & USB_FLG_USE_DEFAULT_RW)){ uchar rval = usbFunctionWrite(data, len); replyLen = 0xff; if(rval == 0xff){ /* an error occurred */ usbMsgLen = 0xff; /* cancel potentially pending data packet for ACK */ usbTxLen = USBPID_STALL; }else if(rval != 0){ /* This was the final package */ replyLen = 0; /* answer with a zero-sized data packet */ } flags = 0; /* start with a DATA1 package, stay with user supplied write() function */ } #endif } usbMsgFlags = flags; usbMsgLen = replyLen; } /* ------------------------------------------------------------------------- */ static void usbBuildTxBlock(void) { uchar wantLen, len, txLen, token; wantLen = usbMsgLen; if(wantLen > 8) wantLen = 8; usbMsgLen -= wantLen; token = USBPID_DATA1; if(usbMsgFlags & USB_FLG_TX_PACKET) token = USBPID_DATA0; usbMsgFlags++; len = usbRead(usbTxBuf + 1, wantLen); if(len <= 8){ /* valid data packet */ usbCrc16Append(&usbTxBuf[1], len); txLen = len + 4; /* length including sync byte */ if(len < 8) /* a partial package identifies end of message */ usbMsgLen = 0xff; }else{ txLen = USBPID_STALL; /* stall the endpoint */ usbMsgLen = 0xff; } usbTxBuf[0] = token; usbTxLen = txLen; DBG2(0x20, usbTxBuf, txLen-1); } /* ------------------------------------------------------------------------- */ static inline uchar isNotSE0(void) { uchar rval; /* We want to do * return (USBIN & USBMASK); * here, but the compiler does int-expansion acrobatics. * We can avoid this by assigning to a char-sized variable. */ rval = USBIN & USBMASK; return rval; } 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; if((len = usbRxLen) > 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 - 3); #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 != 0xff){ /* transmit data pending? */ usbBuildTxBlock(); } } for(i = 10; i > 0; i--){ if(isNotSE0()) break; } if(i == 0){ /* RESET condition, called multiple times during reset */ usbNewDeviceAddr = 0; usbDeviceAddr = 0; usbResetStall(); DBG1(0xff, 0, 0); } 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(); } /* ------------------------------------------------------------------------- */