| 0,0 → 1,551 |
|---|
| /* 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,v 1.3 2007/06/07 13:53:47 harbaum Exp $ |
| */ |
| |
| #include "iarcompat.h" |
| #ifndef __IAR_SYSTEMS_ICC__ |
| # include <avr/io.h> |
| # include <avr/pgmspace.h> |
| #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. |
| */ |
| |
| #ifndef IAR_SECTION |
| #define IAR_SECTION(arg) |
| #define __no_init |
| #endif |
| /* The macro IAR_SECTION is a hack to allow IAR-cc compatibility. On gcc, it |
| * is defined to nothing. __no_init is required on IAR. |
| */ |
| |
| /* ------------------------------------------------------------------------- */ |
| |
| /* 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, if more than 1 rx endpoint: MSb=endpoint */ |
| uchar usbRxToken; /* token for data we received; if more than 1 rx endpoint: MSb=endpoint */ |
| 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_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 1 */ |
| uchar usbTxBuf3[USB_BUFSIZE]; /* TX data for endpoint 1 */ |
| #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 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_DEVICE == 0 && USB_CFG_DEVICE_NAME_LEN |
| #undef USB_CFG_DESCR_PROPS_STRING_DEVICE |
| #define USB_CFG_DESCR_PROPS_STRING_DEVICE 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 */ |
| |
| #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 */ |
| USB_CFG_VENDOR_ID, /* 2 bytes */ |
| 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_DEVICE != 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 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 |
| 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 */ |
| 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. |
| */ |
| |
| /* ------------------------------------------------------------------------- */ |
| |
| #if USB_CFG_HAVE_INTRIN_ENDPOINT |
| 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 |
| 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 = (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 */ |
| #if USB_CFG_IMPLEMENT_FN_WRITEOUT |
| if(usbRxToken == 0xff){ |
| 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]; |
| }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_DEVICE, 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 */ |
| }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) |
| }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]; |
| #if USB_CFG_IMPLEMENT_HALT |
| usbTxLen1 = USBPID_NAK; |
| #endif |
| }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 */ |
| USB_SET_DATATOKEN1(USBPID_DATA0); /* reset data toggling for interrupt endpoint */ |
| # if USB_CFG_HAVE_INTRIN_ENDPOINT3 |
| USB_SET_DATATOKEN3(USBPID_DATA0); /* reset data toggling for interrupt endpoint */ |
| # endif |
| # if USB_CFG_IMPLEMENT_HALT |
| usbTxLen1 = USBPID_NAK; |
| }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; |
| USB_SET_DATATOKEN1(USBPID_DATA0); /* reset data toggling for interrupt endpoint */ |
| # if USB_CFG_HAVE_INTRIN_ENDPOINT3 |
| USB_SET_DATATOKEN3(USBPID_DATA0); /* reset data toggling for interrupt endpoint */ |
| # endif |
| } |
| # 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; |
| } |
| |
| /* ------------------------------------------------------------------------- */ |
| |
| void usbPoll(void) |
| { |
| uchar len, 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; |
| #if USB_CFG_IMPLEMENT_HALT |
| usbTxLen1 = USBPID_NAK; |
| #if USB_CFG_HAVE_INTRIN_ENDPOINT3 |
| usbTxLen3 = USBPID_NAK; |
| #endif |
| #endif |
| DBG1(0xff, 0, 0); |
| } |
| } |
| |
| /* ------------------------------------------------------------------------- */ |
| |
| 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); |
| #if USB_CFG_HAVE_INTRIN_ENDPOINT |
| USB_SET_DATATOKEN1(USBPID_DATA0); /* reset data toggling for interrupt endpoint */ |
| # if USB_CFG_HAVE_INTRIN_ENDPOINT3 |
| USB_SET_DATATOKEN3(USBPID_DATA0); /* reset data toggling for interrupt endpoint */ |
| # endif |
| #endif |
| } |
| |
| /* ------------------------------------------------------------------------- */ |