0,0 → 1,625 |
/* 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 791 2010-07-15 15:56:13Z 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)(0x80 | USB_CFG_EP3_NUMBER), /* IN endpoint number 3 */ |
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 |
} |
|
/* ------------------------------------------------------------------------- */ |