diff options
Diffstat (limited to 'avrusb/usbdrv.c')
| -rw-r--r-- | avrusb/usbdrv.c | 578 |
1 files changed, 578 insertions, 0 deletions
diff --git a/avrusb/usbdrv.c b/avrusb/usbdrv.c new file mode 100644 index 0000000..51c76b6 --- /dev/null +++ b/avrusb/usbdrv.c @@ -0,0 +1,578 @@ +/* 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: $Id$ + */ + +#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. +*/ + +/* ------------------------------------------------------------------------- */ + +/* 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 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 */ + +#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 + +#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 + (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 = (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(); +} + +/* ------------------------------------------------------------------------- */ |