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[fnordlicht-mini] / firmware / fnordlicht-controller / usbdrv / usbdrv.c
1 /* Name: usbdrv.c
2 * Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
3 * Author: Christian Starkjohann
4 * Creation Date: 2004-12-29
5 * Tabsize: 4
6 * Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH
7 * License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
8 * This Revision: $Id: usbdrv.c 763 2009-08-22 10:27:24Z cs $
9 */
10
11 #include "usbportability.h"
12 #include "usbdrv.h"
13 #include "oddebug.h"
14
15 /*
16 General Description:
17 This module implements the C-part of the USB driver. See usbdrv.h for a
18 documentation of the entire driver.
19 */
20
21 /* ------------------------------------------------------------------------- */
22
23 /* raw USB registers / interface to assembler code: */
24 uchar usbRxBuf[2*USB_BUFSIZE]; /* raw RX buffer: PID, 8 bytes data, 2 bytes CRC */
25 uchar usbInputBufOffset; /* offset in usbRxBuf used for low level receiving */
26 uchar usbDeviceAddr; /* assigned during enumeration, defaults to 0 */
27 uchar usbNewDeviceAddr; /* device ID which should be set after status phase */
28 uchar usbConfiguration; /* currently selected configuration. Administered by driver, but not used */
29 volatile schar usbRxLen; /* = 0; number of bytes in usbRxBuf; 0 means free, -1 for flow control */
30 uchar usbCurrentTok; /* last token received or endpoint number for last OUT token if != 0 */
31 uchar usbRxToken; /* token for data we received; or endpont number for last OUT */
32 volatile uchar usbTxLen = USBPID_NAK; /* number of bytes to transmit with next IN token or handshake token */
33 uchar usbTxBuf[USB_BUFSIZE];/* data to transmit with next IN, free if usbTxLen contains handshake token */
34 #if USB_COUNT_SOF
35 volatile uchar usbSofCount; /* incremented by assembler module every SOF */
36 #endif
37 #if USB_CFG_HAVE_INTRIN_ENDPOINT && !USB_CFG_SUPPRESS_INTR_CODE
38 usbTxStatus_t usbTxStatus1;
39 # if USB_CFG_HAVE_INTRIN_ENDPOINT3
40 usbTxStatus_t usbTxStatus3;
41 # endif
42 #endif
43 #if USB_CFG_CHECK_DATA_TOGGLING
44 uchar usbCurrentDataToken;/* when we check data toggling to ignore duplicate packets */
45 #endif
46
47 /* USB status registers / not shared with asm code */
48 uchar *usbMsgPtr; /* data to transmit next -- ROM or RAM address */
49 static usbMsgLen_t usbMsgLen = USB_NO_MSG; /* remaining number of bytes */
50 static uchar usbMsgFlags; /* flag values see below */
51
52 #define USB_FLG_MSGPTR_IS_ROM (1<<6)
53 #define USB_FLG_USE_USER_RW (1<<7)
54
55 /*
56 optimizing hints:
57 - do not post/pre inc/dec integer values in operations
58 - assign value of USB_READ_FLASH() to register variables and don't use side effects in arg
59 - use narrow scope for variables which should be in X/Y/Z register
60 - assign char sized expressions to variables to force 8 bit arithmetics
61 */
62
63 /* -------------------------- String Descriptors --------------------------- */
64
65 #if USB_CFG_DESCR_PROPS_STRINGS == 0
66
67 #if USB_CFG_DESCR_PROPS_STRING_0 == 0
68 #undef USB_CFG_DESCR_PROPS_STRING_0
69 #define USB_CFG_DESCR_PROPS_STRING_0 sizeof(usbDescriptorString0)
70 PROGMEM char usbDescriptorString0[] = { /* language descriptor */
71 4, /* sizeof(usbDescriptorString0): length of descriptor in bytes */
72 3, /* descriptor type */
73 0x09, 0x04, /* language index (0x0409 = US-English) */
74 };
75 #endif
76
77 #if USB_CFG_DESCR_PROPS_STRING_VENDOR == 0 && USB_CFG_VENDOR_NAME_LEN
78 #undef USB_CFG_DESCR_PROPS_STRING_VENDOR
79 #define USB_CFG_DESCR_PROPS_STRING_VENDOR sizeof(usbDescriptorStringVendor)
80 PROGMEM int usbDescriptorStringVendor[] = {
81 USB_STRING_DESCRIPTOR_HEADER(USB_CFG_VENDOR_NAME_LEN),
82 USB_CFG_VENDOR_NAME
83 };
84 #endif
85
86 #if USB_CFG_DESCR_PROPS_STRING_PRODUCT == 0 && USB_CFG_DEVICE_NAME_LEN
87 #undef USB_CFG_DESCR_PROPS_STRING_PRODUCT
88 #define USB_CFG_DESCR_PROPS_STRING_PRODUCT sizeof(usbDescriptorStringDevice)
89 PROGMEM int usbDescriptorStringDevice[] = {
90 USB_STRING_DESCRIPTOR_HEADER(USB_CFG_DEVICE_NAME_LEN),
91 USB_CFG_DEVICE_NAME
92 };
93 #endif
94
95 #if USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER == 0 && USB_CFG_SERIAL_NUMBER_LEN
96 #undef USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER
97 #define USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER sizeof(usbDescriptorStringSerialNumber)
98 PROGMEM int usbDescriptorStringSerialNumber[] = {
99 USB_STRING_DESCRIPTOR_HEADER(USB_CFG_SERIAL_NUMBER_LEN),
100 USB_CFG_SERIAL_NUMBER
101 };
102 #endif
103
104 #endif /* USB_CFG_DESCR_PROPS_STRINGS == 0 */
105
106 /* --------------------------- Device Descriptor --------------------------- */
107
108 #if USB_CFG_DESCR_PROPS_DEVICE == 0
109 #undef USB_CFG_DESCR_PROPS_DEVICE
110 #define USB_CFG_DESCR_PROPS_DEVICE sizeof(usbDescriptorDevice)
111 PROGMEM char usbDescriptorDevice[] = { /* USB device descriptor */
112 18, /* sizeof(usbDescriptorDevice): length of descriptor in bytes */
113 USBDESCR_DEVICE, /* descriptor type */
114 0x10, 0x01, /* USB version supported */
115 USB_CFG_DEVICE_CLASS,
116 USB_CFG_DEVICE_SUBCLASS,
117 0, /* protocol */
118 8, /* max packet size */
119 /* the following two casts affect the first byte of the constant only, but
120 * that's sufficient to avoid a warning with the default values.
121 */
122 (char)USB_CFG_VENDOR_ID,/* 2 bytes */
123 (char)USB_CFG_DEVICE_ID,/* 2 bytes */
124 USB_CFG_DEVICE_VERSION, /* 2 bytes */
125 USB_CFG_DESCR_PROPS_STRING_VENDOR != 0 ? 1 : 0, /* manufacturer string index */
126 USB_CFG_DESCR_PROPS_STRING_PRODUCT != 0 ? 2 : 0, /* product string index */
127 USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER != 0 ? 3 : 0, /* serial number string index */
128 1, /* number of configurations */
129 };
130 #endif
131
132 /* ----------------------- Configuration Descriptor ------------------------ */
133
134 #if USB_CFG_DESCR_PROPS_HID_REPORT != 0 && USB_CFG_DESCR_PROPS_HID == 0
135 #undef USB_CFG_DESCR_PROPS_HID
136 #define USB_CFG_DESCR_PROPS_HID 9 /* length of HID descriptor in config descriptor below */
137 #endif
138
139 #if USB_CFG_DESCR_PROPS_CONFIGURATION == 0
140 #undef USB_CFG_DESCR_PROPS_CONFIGURATION
141 #define USB_CFG_DESCR_PROPS_CONFIGURATION sizeof(usbDescriptorConfiguration)
142 PROGMEM char usbDescriptorConfiguration[] = { /* USB configuration descriptor */
143 9, /* sizeof(usbDescriptorConfiguration): length of descriptor in bytes */
144 USBDESCR_CONFIG, /* descriptor type */
145 18 + 7 * USB_CFG_HAVE_INTRIN_ENDPOINT + 7 * USB_CFG_HAVE_INTRIN_ENDPOINT3 +
146 (USB_CFG_DESCR_PROPS_HID & 0xff), 0,
147 /* total length of data returned (including inlined descriptors) */
148 1, /* number of interfaces in this configuration */
149 1, /* index of this configuration */
150 0, /* configuration name string index */
151 #if USB_CFG_IS_SELF_POWERED
152 (1 << 7) | USBATTR_SELFPOWER, /* attributes */
153 #else
154 (1 << 7), /* attributes */
155 #endif
156 USB_CFG_MAX_BUS_POWER/2, /* max USB current in 2mA units */
157 /* interface descriptor follows inline: */
158 9, /* sizeof(usbDescrInterface): length of descriptor in bytes */
159 USBDESCR_INTERFACE, /* descriptor type */
160 0, /* index of this interface */
161 0, /* alternate setting for this interface */
162 USB_CFG_HAVE_INTRIN_ENDPOINT + USB_CFG_HAVE_INTRIN_ENDPOINT3, /* endpoints excl 0: number of endpoint descriptors to follow */
163 USB_CFG_INTERFACE_CLASS,
164 USB_CFG_INTERFACE_SUBCLASS,
165 USB_CFG_INTERFACE_PROTOCOL,
166 0, /* string index for interface */
167 #if (USB_CFG_DESCR_PROPS_HID & 0xff) /* HID descriptor */
168 9, /* sizeof(usbDescrHID): length of descriptor in bytes */
169 USBDESCR_HID, /* descriptor type: HID */
170 0x01, 0x01, /* BCD representation of HID version */
171 0x00, /* target country code */
172 0x01, /* number of HID Report (or other HID class) Descriptor infos to follow */
173 0x22, /* descriptor type: report */
174 USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH, 0, /* total length of report descriptor */
175 #endif
176 #if USB_CFG_HAVE_INTRIN_ENDPOINT /* endpoint descriptor for endpoint 1 */
177 7, /* sizeof(usbDescrEndpoint) */
178 USBDESCR_ENDPOINT, /* descriptor type = endpoint */
179 (char)0x81, /* IN endpoint number 1 */
180 0x03, /* attrib: Interrupt endpoint */
181 8, 0, /* maximum packet size */
182 USB_CFG_INTR_POLL_INTERVAL, /* in ms */
183 #endif
184 #if USB_CFG_HAVE_INTRIN_ENDPOINT3 /* endpoint descriptor for endpoint 3 */
185 7, /* sizeof(usbDescrEndpoint) */
186 USBDESCR_ENDPOINT, /* descriptor type = endpoint */
187 (char)0x83, /* IN endpoint number 1 */
188 0x03, /* attrib: Interrupt endpoint */
189 8, 0, /* maximum packet size */
190 USB_CFG_INTR_POLL_INTERVAL, /* in ms */
191 #endif
192 };
193 #endif
194
195 /* ------------------------------------------------------------------------- */
196
197 static inline void usbResetDataToggling(void)
198 {
199 #if USB_CFG_HAVE_INTRIN_ENDPOINT && !USB_CFG_SUPPRESS_INTR_CODE
200 USB_SET_DATATOKEN1(USB_INITIAL_DATATOKEN); /* reset data toggling for interrupt endpoint */
201 # if USB_CFG_HAVE_INTRIN_ENDPOINT3
202 USB_SET_DATATOKEN3(USB_INITIAL_DATATOKEN); /* reset data toggling for interrupt endpoint */
203 # endif
204 #endif
205 }
206
207 static inline void usbResetStall(void)
208 {
209 #if USB_CFG_IMPLEMENT_HALT && USB_CFG_HAVE_INTRIN_ENDPOINT
210 usbTxLen1 = USBPID_NAK;
211 #if USB_CFG_HAVE_INTRIN_ENDPOINT3
212 usbTxLen3 = USBPID_NAK;
213 #endif
214 #endif
215 }
216
217 /* ------------------------------------------------------------------------- */
218
219 #if !USB_CFG_SUPPRESS_INTR_CODE
220 #if USB_CFG_HAVE_INTRIN_ENDPOINT
221 static void usbGenericSetInterrupt(uchar *data, uchar len, usbTxStatus_t *txStatus)
222 {
223 uchar *p;
224 char i;
225
226 #if USB_CFG_IMPLEMENT_HALT
227 if(usbTxLen1 == USBPID_STALL)
228 return;
229 #endif
230 if(txStatus->len & 0x10){ /* packet buffer was empty */
231 txStatus->buffer[0] ^= USBPID_DATA0 ^ USBPID_DATA1; /* toggle token */
232 }else{
233 txStatus->len = USBPID_NAK; /* avoid sending outdated (overwritten) interrupt data */
234 }
235 p = txStatus->buffer + 1;
236 i = len;
237 do{ /* if len == 0, we still copy 1 byte, but that's no problem */
238 *p++ = *data++;
239 }while(--i > 0); /* loop control at the end is 2 bytes shorter than at beginning */
240 usbCrc16Append(&txStatus->buffer[1], len);
241 txStatus->len = len + 4; /* len must be given including sync byte */
242 DBG2(0x21 + (((int)txStatus >> 3) & 3), txStatus->buffer, len + 3);
243 }
244
245 USB_PUBLIC void usbSetInterrupt(uchar *data, uchar len)
246 {
247 usbGenericSetInterrupt(data, len, &usbTxStatus1);
248 }
249 #endif
250
251 #if USB_CFG_HAVE_INTRIN_ENDPOINT3
252 USB_PUBLIC void usbSetInterrupt3(uchar *data, uchar len)
253 {
254 usbGenericSetInterrupt(data, len, &usbTxStatus3);
255 }
256 #endif
257 #endif /* USB_CFG_SUPPRESS_INTR_CODE */
258
259 /* ------------------ utilities for code following below ------------------- */
260
261 /* Use defines for the switch statement so that we can choose between an
262 * if()else if() and a switch/case based implementation. switch() is more
263 * efficient for a LARGE set of sequential choices, if() is better in all other
264 * cases.
265 */
266 #if USB_CFG_USE_SWITCH_STATEMENT
267 # define SWITCH_START(cmd) switch(cmd){{
268 # define SWITCH_CASE(value) }break; case (value):{
269 # define SWITCH_CASE2(v1,v2) }break; case (v1): case(v2):{
270 # define SWITCH_CASE3(v1,v2,v3) }break; case (v1): case(v2): case(v3):{
271 # define SWITCH_DEFAULT }break; default:{
272 # define SWITCH_END }}
273 #else
274 # define SWITCH_START(cmd) {uchar _cmd = cmd; if(0){
275 # define SWITCH_CASE(value) }else if(_cmd == (value)){
276 # define SWITCH_CASE2(v1,v2) }else if(_cmd == (v1) || _cmd == (v2)){
277 # define SWITCH_CASE3(v1,v2,v3) }else if(_cmd == (v1) || _cmd == (v2) || (_cmd == v3)){
278 # define SWITCH_DEFAULT }else{
279 # define SWITCH_END }}
280 #endif
281
282 #ifndef USB_RX_USER_HOOK
283 #define USB_RX_USER_HOOK(data, len)
284 #endif
285 #ifndef USB_SET_ADDRESS_HOOK
286 #define USB_SET_ADDRESS_HOOK()
287 #endif
288
289 /* ------------------------------------------------------------------------- */
290
291 /* We use if() instead of #if in the macro below because #if can't be used
292 * in macros and the compiler optimizes constant conditions anyway.
293 * This may cause problems with undefined symbols if compiled without
294 * optimizing!
295 */
296 #define GET_DESCRIPTOR(cfgProp, staticName) \
297 if(cfgProp){ \
298 if((cfgProp) & USB_PROP_IS_RAM) \
299 flags = 0; \
300 if((cfgProp) & USB_PROP_IS_DYNAMIC){ \
301 len = usbFunctionDescriptor(rq); \
302 }else{ \
303 len = USB_PROP_LENGTH(cfgProp); \
304 usbMsgPtr = (uchar *)(staticName); \
305 } \
306 }
307
308 /* usbDriverDescriptor() is similar to usbFunctionDescriptor(), but used
309 * internally for all types of descriptors.
310 */
311 static inline usbMsgLen_t usbDriverDescriptor(usbRequest_t *rq)
312 {
313 usbMsgLen_t len = 0;
314 uchar flags = USB_FLG_MSGPTR_IS_ROM;
315
316 SWITCH_START(rq->wValue.bytes[1])
317 SWITCH_CASE(USBDESCR_DEVICE) /* 1 */
318 GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_DEVICE, usbDescriptorDevice)
319 SWITCH_CASE(USBDESCR_CONFIG) /* 2 */
320 GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_CONFIGURATION, usbDescriptorConfiguration)
321 SWITCH_CASE(USBDESCR_STRING) /* 3 */
322 #if USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC
323 if(USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_RAM)
324 flags = 0;
325 len = usbFunctionDescriptor(rq);
326 #else /* USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC */
327 SWITCH_START(rq->wValue.bytes[0])
328 SWITCH_CASE(0)
329 GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_0, usbDescriptorString0)
330 SWITCH_CASE(1)
331 GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_VENDOR, usbDescriptorStringVendor)
332 SWITCH_CASE(2)
333 GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_PRODUCT, usbDescriptorStringDevice)
334 SWITCH_CASE(3)
335 GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER, usbDescriptorStringSerialNumber)
336 SWITCH_DEFAULT
337 if(USB_CFG_DESCR_PROPS_UNKNOWN & USB_PROP_IS_DYNAMIC){
338 len = usbFunctionDescriptor(rq);
339 }
340 SWITCH_END
341 #endif /* USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC */
342 #if USB_CFG_DESCR_PROPS_HID_REPORT /* only support HID descriptors if enabled */
343 SWITCH_CASE(USBDESCR_HID) /* 0x21 */
344 GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_HID, usbDescriptorConfiguration + 18)
345 SWITCH_CASE(USBDESCR_HID_REPORT)/* 0x22 */
346 GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_HID_REPORT, usbDescriptorHidReport)
347 #endif
348 SWITCH_DEFAULT
349 if(USB_CFG_DESCR_PROPS_UNKNOWN & USB_PROP_IS_DYNAMIC){
350 len = usbFunctionDescriptor(rq);
351 }
352 SWITCH_END
353 usbMsgFlags = flags;
354 return len;
355 }
356
357 /* ------------------------------------------------------------------------- */
358
359 /* usbDriverSetup() is similar to usbFunctionSetup(), but it's used for
360 * standard requests instead of class and custom requests.
361 */
362 static inline usbMsgLen_t usbDriverSetup(usbRequest_t *rq)
363 {
364 uchar len = 0, *dataPtr = usbTxBuf + 9; /* there are 2 bytes free space at the end of the buffer */
365 uchar value = rq->wValue.bytes[0];
366 #if USB_CFG_IMPLEMENT_HALT
367 uchar index = rq->wIndex.bytes[0];
368 #endif
369
370 dataPtr[0] = 0; /* default reply common to USBRQ_GET_STATUS and USBRQ_GET_INTERFACE */
371 SWITCH_START(rq->bRequest)
372 SWITCH_CASE(USBRQ_GET_STATUS) /* 0 */
373 uchar recipient = rq->bmRequestType & USBRQ_RCPT_MASK; /* assign arith ops to variables to enforce byte size */
374 if(USB_CFG_IS_SELF_POWERED && recipient == USBRQ_RCPT_DEVICE)
375 dataPtr[0] = USB_CFG_IS_SELF_POWERED;
376 #if USB_CFG_IMPLEMENT_HALT
377 if(recipient == USBRQ_RCPT_ENDPOINT && index == 0x81) /* request status for endpoint 1 */
378 dataPtr[0] = usbTxLen1 == USBPID_STALL;
379 #endif
380 dataPtr[1] = 0;
381 len = 2;
382 #if USB_CFG_IMPLEMENT_HALT
383 SWITCH_CASE2(USBRQ_CLEAR_FEATURE, USBRQ_SET_FEATURE) /* 1, 3 */
384 if(value == 0 && index == 0x81){ /* feature 0 == HALT for endpoint == 1 */
385 usbTxLen1 = rq->bRequest == USBRQ_CLEAR_FEATURE ? USBPID_NAK : USBPID_STALL;
386 usbResetDataToggling();
387 }
388 #endif
389 SWITCH_CASE(USBRQ_SET_ADDRESS) /* 5 */
390 usbNewDeviceAddr = value;
391 USB_SET_ADDRESS_HOOK();
392 SWITCH_CASE(USBRQ_GET_DESCRIPTOR) /* 6 */
393 len = usbDriverDescriptor(rq);
394 goto skipMsgPtrAssignment;
395 SWITCH_CASE(USBRQ_GET_CONFIGURATION) /* 8 */
396 dataPtr = &usbConfiguration; /* send current configuration value */
397 len = 1;
398 SWITCH_CASE(USBRQ_SET_CONFIGURATION) /* 9 */
399 usbConfiguration = value;
400 usbResetStall();
401 SWITCH_CASE(USBRQ_GET_INTERFACE) /* 10 */
402 len = 1;
403 #if USB_CFG_HAVE_INTRIN_ENDPOINT && !USB_CFG_SUPPRESS_INTR_CODE
404 SWITCH_CASE(USBRQ_SET_INTERFACE) /* 11 */
405 usbResetDataToggling();
406 usbResetStall();
407 #endif
408 SWITCH_DEFAULT /* 7=SET_DESCRIPTOR, 12=SYNC_FRAME */
409 /* Should we add an optional hook here? */
410 SWITCH_END
411 usbMsgPtr = dataPtr;
412 skipMsgPtrAssignment:
413 return len;
414 }
415
416 /* ------------------------------------------------------------------------- */
417
418 /* usbProcessRx() is called for every message received by the interrupt
419 * routine. It distinguishes between SETUP and DATA packets and processes
420 * them accordingly.
421 */
422 static inline void usbProcessRx(uchar *data, uchar len)
423 {
424 usbRequest_t *rq = (void *)data;
425
426 /* usbRxToken can be:
427 * 0x2d 00101101 (USBPID_SETUP for setup data)
428 * 0xe1 11100001 (USBPID_OUT: data phase of setup transfer)
429 * 0...0x0f for OUT on endpoint X
430 */
431 DBG2(0x10 + (usbRxToken & 0xf), data, len + 2); /* SETUP=1d, SETUP-DATA=11, OUTx=1x */
432 USB_RX_USER_HOOK(data, len)
433 #if USB_CFG_IMPLEMENT_FN_WRITEOUT
434 if(usbRxToken < 0x10){ /* OUT to endpoint != 0: endpoint number in usbRxToken */
435 usbFunctionWriteOut(data, len);
436 return;
437 }
438 #endif
439 if(usbRxToken == (uchar)USBPID_SETUP){
440 if(len != 8) /* Setup size must be always 8 bytes. Ignore otherwise. */
441 return;
442 usbMsgLen_t replyLen;
443 usbTxBuf[0] = USBPID_DATA0; /* initialize data toggling */
444 usbTxLen = USBPID_NAK; /* abort pending transmit */
445 usbMsgFlags = 0;
446 uchar type = rq->bmRequestType & USBRQ_TYPE_MASK;
447 if(type != USBRQ_TYPE_STANDARD){ /* standard requests are handled by driver */
448 replyLen = usbFunctionSetup(data);
449 }else{
450 replyLen = usbDriverSetup(rq);
451 }
452 #if USB_CFG_IMPLEMENT_FN_READ || USB_CFG_IMPLEMENT_FN_WRITE
453 if(replyLen == USB_NO_MSG){ /* use user-supplied read/write function */
454 /* do some conditioning on replyLen, but on IN transfers only */
455 if((rq->bmRequestType & USBRQ_DIR_MASK) != USBRQ_DIR_HOST_TO_DEVICE){
456 if(sizeof(replyLen) < sizeof(rq->wLength.word)){ /* help compiler with optimizing */
457 replyLen = rq->wLength.bytes[0];
458 }else{
459 replyLen = rq->wLength.word;
460 }
461 }
462 usbMsgFlags = USB_FLG_USE_USER_RW;
463 }else /* The 'else' prevents that we limit a replyLen of USB_NO_MSG to the maximum transfer len. */
464 #endif
465 if(sizeof(replyLen) < sizeof(rq->wLength.word)){ /* help compiler with optimizing */
466 if(!rq->wLength.bytes[1] && replyLen > rq->wLength.bytes[0]) /* limit length to max */
467 replyLen = rq->wLength.bytes[0];
468 }else{
469 if(replyLen > rq->wLength.word) /* limit length to max */
470 replyLen = rq->wLength.word;
471 }
472 usbMsgLen = replyLen;
473 }else{ /* usbRxToken must be USBPID_OUT, which means data phase of setup (control-out) */
474 #if USB_CFG_IMPLEMENT_FN_WRITE
475 if(usbMsgFlags & USB_FLG_USE_USER_RW){
476 uchar rval = usbFunctionWrite(data, len);
477 if(rval == 0xff){ /* an error occurred */
478 usbTxLen = USBPID_STALL;
479 }else if(rval != 0){ /* This was the final package */
480 usbMsgLen = 0; /* answer with a zero-sized data packet */
481 }
482 }
483 #endif
484 }
485 }
486
487 /* ------------------------------------------------------------------------- */
488
489 /* This function is similar to usbFunctionRead(), but it's also called for
490 * data handled automatically by the driver (e.g. descriptor reads).
491 */
492 static uchar usbDeviceRead(uchar *data, uchar len)
493 {
494 if(len > 0){ /* don't bother app with 0 sized reads */
495 #if USB_CFG_IMPLEMENT_FN_READ
496 if(usbMsgFlags & USB_FLG_USE_USER_RW){
497 len = usbFunctionRead(data, len);
498 }else
499 #endif
500 {
501 uchar i = len, *r = usbMsgPtr;
502 if(usbMsgFlags & USB_FLG_MSGPTR_IS_ROM){ /* ROM data */
503 do{
504 uchar c = USB_READ_FLASH(r); /* assign to char size variable to enforce byte ops */
505 *data++ = c;
506 r++;
507 }while(--i);
508 }else{ /* RAM data */
509 do{
510 *data++ = *r++;
511 }while(--i);
512 }
513 usbMsgPtr = r;
514 }
515 }
516 return len;
517 }
518
519 /* ------------------------------------------------------------------------- */
520
521 /* usbBuildTxBlock() is called when we have data to transmit and the
522 * interrupt routine's transmit buffer is empty.
523 */
524 static inline void usbBuildTxBlock(void)
525 {
526 usbMsgLen_t wantLen;
527 uchar len;
528
529 wantLen = usbMsgLen;
530 if(wantLen > 8)
531 wantLen = 8;
532 usbMsgLen -= wantLen;
533 usbTxBuf[0] ^= USBPID_DATA0 ^ USBPID_DATA1; /* DATA toggling */
534 len = usbDeviceRead(usbTxBuf + 1, wantLen);
535 if(len <= 8){ /* valid data packet */
536 usbCrc16Append(&usbTxBuf[1], len);
537 len += 4; /* length including sync byte */
538 if(len < 12) /* a partial package identifies end of message */
539 usbMsgLen = USB_NO_MSG;
540 }else{
541 len = USBPID_STALL; /* stall the endpoint */
542 usbMsgLen = USB_NO_MSG;
543 }
544 usbTxLen = len;
545 DBG2(0x20, usbTxBuf, len-1);
546 }
547
548 /* ------------------------------------------------------------------------- */
549
550 static inline void usbHandleResetHook(uchar notResetState)
551 {
552 #ifdef USB_RESET_HOOK
553 static uchar wasReset;
554 uchar isReset = !notResetState;
555
556 if(wasReset != isReset){
557 USB_RESET_HOOK(isReset);
558 wasReset = isReset;
559 }
560 #endif
561 }
562
563 /* ------------------------------------------------------------------------- */
564
565 USB_PUBLIC void usbPoll(void)
566 {
567 schar len;
568 uchar i;
569
570 len = usbRxLen - 3;
571 if(len >= 0){
572 /* We could check CRC16 here -- but ACK has already been sent anyway. If you
573 * need data integrity checks with this driver, check the CRC in your app
574 * code and report errors back to the host. Since the ACK was already sent,
575 * retries must be handled on application level.
576 * unsigned crc = usbCrc16(buffer + 1, usbRxLen - 3);
577 */
578 usbProcessRx(usbRxBuf + USB_BUFSIZE + 1 - usbInputBufOffset, len);
579 #if USB_CFG_HAVE_FLOWCONTROL
580 if(usbRxLen > 0) /* only mark as available if not inactivated */
581 usbRxLen = 0;
582 #else
583 usbRxLen = 0; /* mark rx buffer as available */
584 #endif
585 }
586 if(usbTxLen & 0x10){ /* transmit system idle */
587 if(usbMsgLen != USB_NO_MSG){ /* transmit data pending? */
588 usbBuildTxBlock();
589 }
590 }
591 for(i = 20; i > 0; i--){
592 uchar usbLineStatus = USBIN & USBMASK;
593 if(usbLineStatus != 0) /* SE0 has ended */
594 goto isNotReset;
595 }
596 /* RESET condition, called multiple times during reset */
597 usbNewDeviceAddr = 0;
598 usbDeviceAddr = 0;
599 usbResetStall();
600 DBG1(0xff, 0, 0);
601 isNotReset:
602 usbHandleResetHook(i);
603 }
604
605 /* ------------------------------------------------------------------------- */
606
607 USB_PUBLIC void usbInit(void)
608 {
609 #if USB_INTR_CFG_SET != 0
610 USB_INTR_CFG |= USB_INTR_CFG_SET;
611 #endif
612 #if USB_INTR_CFG_CLR != 0
613 USB_INTR_CFG &= ~(USB_INTR_CFG_CLR);
614 #endif
615 USB_INTR_ENABLE |= (1 << USB_INTR_ENABLE_BIT);
616 usbResetDataToggling();
617 #if USB_CFG_HAVE_INTRIN_ENDPOINT && !USB_CFG_SUPPRESS_INTR_CODE
618 usbTxLen1 = USBPID_NAK;
619 #if USB_CFG_HAVE_INTRIN_ENDPOINT3
620 usbTxLen3 = USBPID_NAK;
621 #endif
622 #endif
623 }
624
625 /* ------------------------------------------------------------------------- */
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