+++ /dev/null
-/* 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 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)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 = (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
-}
-
-/* ------------------------------------------------------------------------- */
projects / fnordlicht-mini / blobdiff