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USBasp 2007.10.23.
[pub/USBasp.git] / firmware / usbdrv / usbdrv.c
1 /* Name: usbdrv.c
2 * Project: AVR USB driver
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) or proprietary (CommercialLicense.txt)
8 * This Revision: $Id: usbdrv.c 350 2007-06-13 11:43:16Z cs $
9 */
10
11 #include "iarcompat.h"
12 #ifndef __IAR_SYSTEMS_ICC__
13 # include <avr/io.h>
14 # include <avr/pgmspace.h>
15 #endif
16 #include "usbdrv.h"
17 #include "oddebug.h"
18
19 /*
20 General Description:
21 This module implements the C-part of the USB driver. See usbdrv.h for a
22 documentation of the entire driver.
23 */
24
25 #ifndef IAR_SECTION
26 #define IAR_SECTION(arg)
27 #define __no_init
28 #endif
29 /* The macro IAR_SECTION is a hack to allow IAR-cc compatibility. On gcc, it
30 * is defined to nothing. __no_init is required on IAR.
31 */
32
33 /* ------------------------------------------------------------------------- */
34
35 /* raw USB registers / interface to assembler code: */
36 uchar usbRxBuf[2*USB_BUFSIZE]; /* raw RX buffer: PID, 8 bytes data, 2 bytes CRC */
37 uchar usbInputBufOffset; /* offset in usbRxBuf used for low level receiving */
38 uchar usbDeviceAddr; /* assigned during enumeration, defaults to 0 */
39 uchar usbNewDeviceAddr; /* device ID which should be set after status phase */
40 uchar usbConfiguration; /* currently selected configuration. Administered by driver, but not used */
41 volatile schar usbRxLen; /* = 0; number of bytes in usbRxBuf; 0 means free, -1 for flow control */
42 uchar usbCurrentTok; /* last token received, if more than 1 rx endpoint: MSb=endpoint */
43 uchar usbRxToken; /* token for data we received; if more than 1 rx endpoint: MSb=endpoint */
44 uchar usbMsgLen = 0xff; /* remaining number of bytes, no msg to send if -1 (see usbMsgPtr) */
45 volatile uchar usbTxLen = USBPID_NAK; /* number of bytes to transmit with next IN token or handshake token */
46 uchar usbTxBuf[USB_BUFSIZE];/* data to transmit with next IN, free if usbTxLen contains handshake token */
47 #if USB_CFG_HAVE_INTRIN_ENDPOINT
48 volatile uchar usbTxLen1 = USBPID_NAK; /* TX count for endpoint 1 */
49 uchar usbTxBuf1[USB_BUFSIZE]; /* TX data for endpoint 1 */
50 #if USB_CFG_HAVE_INTRIN_ENDPOINT3
51 volatile uchar usbTxLen3 = USBPID_NAK; /* TX count for endpoint 1 */
52 uchar usbTxBuf3[USB_BUFSIZE]; /* TX data for endpoint 1 */
53 #endif
54 #endif
55
56 /* USB status registers / not shared with asm code */
57 uchar *usbMsgPtr; /* data to transmit next -- ROM or RAM address */
58 static uchar usbMsgFlags; /* flag values see below */
59
60 #define USB_FLG_TX_PACKET (1<<0)
61 /* Leave free 6 bits after TX_PACKET. This way we can increment usbMsgFlags to toggle TX_PACKET */
62 #define USB_FLG_MSGPTR_IS_ROM (1<<6)
63 #define USB_FLG_USE_DEFAULT_RW (1<<7)
64
65 /*
66 optimizing hints:
67 - do not post/pre inc/dec integer values in operations
68 - assign value of PRG_RDB() to register variables and don't use side effects in arg
69 - use narrow scope for variables which should be in X/Y/Z register
70 - assign char sized expressions to variables to force 8 bit arithmetics
71 */
72
73 /* ------------------------------------------------------------------------- */
74
75 #if USB_CFG_DESCR_PROPS_STRINGS == 0
76
77 #if USB_CFG_DESCR_PROPS_STRING_0 == 0
78 #undef USB_CFG_DESCR_PROPS_STRING_0
79 #define USB_CFG_DESCR_PROPS_STRING_0 sizeof(usbDescriptorString0)
80 PROGMEM char usbDescriptorString0[] = { /* language descriptor */
81 4, /* sizeof(usbDescriptorString0): length of descriptor in bytes */
82 3, /* descriptor type */
83 0x09, 0x04, /* language index (0x0409 = US-English) */
84 };
85 #endif
86
87 #if USB_CFG_DESCR_PROPS_STRING_VENDOR == 0 && USB_CFG_VENDOR_NAME_LEN
88 #undef USB_CFG_DESCR_PROPS_STRING_VENDOR
89 #define USB_CFG_DESCR_PROPS_STRING_VENDOR sizeof(usbDescriptorStringVendor)
90 PROGMEM int usbDescriptorStringVendor[] = {
91 USB_STRING_DESCRIPTOR_HEADER(USB_CFG_VENDOR_NAME_LEN),
92 USB_CFG_VENDOR_NAME
93 };
94 #endif
95
96 #if USB_CFG_DESCR_PROPS_STRING_PRODUCT == 0 && USB_CFG_DEVICE_NAME_LEN
97 #undef USB_CFG_DESCR_PROPS_STRING_PRODUCT
98 #define USB_CFG_DESCR_PROPS_STRING_PRODUCT sizeof(usbDescriptorStringDevice)
99 PROGMEM int usbDescriptorStringDevice[] = {
100 USB_STRING_DESCRIPTOR_HEADER(USB_CFG_DEVICE_NAME_LEN),
101 USB_CFG_DEVICE_NAME
102 };
103 #endif
104
105 #if USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER == 0 && USB_CFG_SERIAL_NUMBER_LEN
106 #undef USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER
107 #define USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER sizeof(usbDescriptorStringSerialNumber)
108 PROGMEM int usbDescriptorStringSerialNumber[] = {
109 USB_STRING_DESCRIPTOR_HEADER(USB_CFG_SERIAL_NUMBER_LEN),
110 USB_CFG_SERIAL_NUMBER
111 };
112 #endif
113
114 #endif /* USB_CFG_DESCR_PROPS_STRINGS == 0 */
115
116 #if USB_CFG_DESCR_PROPS_DEVICE == 0
117 #undef USB_CFG_DESCR_PROPS_DEVICE
118 #define USB_CFG_DESCR_PROPS_DEVICE sizeof(usbDescriptorDevice)
119 PROGMEM char usbDescriptorDevice[] = { /* USB device descriptor */
120 18, /* sizeof(usbDescriptorDevice): length of descriptor in bytes */
121 USBDESCR_DEVICE, /* descriptor type */
122 0x10, 0x01, /* USB version supported */
123 USB_CFG_DEVICE_CLASS,
124 USB_CFG_DEVICE_SUBCLASS,
125 0, /* protocol */
126 8, /* max packet size */
127 USB_CFG_VENDOR_ID, /* 2 bytes */
128 USB_CFG_DEVICE_ID, /* 2 bytes */
129 USB_CFG_DEVICE_VERSION, /* 2 bytes */
130 USB_CFG_DESCR_PROPS_STRING_VENDOR != 0 ? 1 : 0, /* manufacturer string index */
131 USB_CFG_DESCR_PROPS_STRING_PRODUCT != 0 ? 2 : 0, /* product string index */
132 USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER != 0 ? 3 : 0, /* serial number string index */
133 1, /* number of configurations */
134 };
135 #endif
136
137 #if USB_CFG_DESCR_PROPS_HID_REPORT != 0 && USB_CFG_DESCR_PROPS_HID == 0
138 #undef USB_CFG_DESCR_PROPS_HID
139 #define USB_CFG_DESCR_PROPS_HID 9 /* length of HID descriptor in config descriptor below */
140 #endif
141
142 #if USB_CFG_DESCR_PROPS_CONFIGURATION == 0
143 #undef USB_CFG_DESCR_PROPS_CONFIGURATION
144 #define USB_CFG_DESCR_PROPS_CONFIGURATION sizeof(usbDescriptorConfiguration)
145 PROGMEM char usbDescriptorConfiguration[] = { /* USB configuration descriptor */
146 9, /* sizeof(usbDescriptorConfiguration): length of descriptor in bytes */
147 USBDESCR_CONFIG, /* descriptor type */
148 18 + 7 * USB_CFG_HAVE_INTRIN_ENDPOINT + (USB_CFG_DESCR_PROPS_HID & 0xff), 0,
149 /* total length of data returned (including inlined descriptors) */
150 1, /* number of interfaces in this configuration */
151 1, /* index of this configuration */
152 0, /* configuration name string index */
153 #if USB_CFG_IS_SELF_POWERED
154 USBATTR_SELFPOWER, /* attributes */
155 #else
156 USBATTR_BUSPOWER, /* attributes */
157 #endif
158 USB_CFG_MAX_BUS_POWER/2, /* max USB current in 2mA units */
159 /* interface descriptor follows inline: */
160 9, /* sizeof(usbDescrInterface): length of descriptor in bytes */
161 USBDESCR_INTERFACE, /* descriptor type */
162 0, /* index of this interface */
163 0, /* alternate setting for this interface */
164 USB_CFG_HAVE_INTRIN_ENDPOINT, /* endpoints excl 0: number of endpoint descriptors to follow */
165 USB_CFG_INTERFACE_CLASS,
166 USB_CFG_INTERFACE_SUBCLASS,
167 USB_CFG_INTERFACE_PROTOCOL,
168 0, /* string index for interface */
169 #if (USB_CFG_DESCR_PROPS_HID & 0xff) /* HID descriptor */
170 9, /* sizeof(usbDescrHID): length of descriptor in bytes */
171 USBDESCR_HID, /* descriptor type: HID */
172 0x01, 0x01, /* BCD representation of HID version */
173 0x00, /* target country code */
174 0x01, /* number of HID Report (or other HID class) Descriptor infos to follow */
175 0x22, /* descriptor type: report */
176 USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH, 0, /* total length of report descriptor */
177 #endif
178 #if USB_CFG_HAVE_INTRIN_ENDPOINT /* endpoint descriptor for endpoint 1 */
179 7, /* sizeof(usbDescrEndpoint) */
180 USBDESCR_ENDPOINT, /* descriptor type = endpoint */
181 0x81, /* IN endpoint number 1 */
182 0x03, /* attrib: Interrupt endpoint */
183 8, 0, /* maximum packet size */
184 USB_CFG_INTR_POLL_INTERVAL, /* in ms */
185 #endif
186 };
187 #endif
188
189 /* We don't use prog_int or prog_int16_t for compatibility with various libc
190 * versions. Here's an other compatibility hack:
191 */
192 #ifndef PRG_RDB
193 #define PRG_RDB(addr) pgm_read_byte(addr)
194 #endif
195
196 typedef union{
197 unsigned word;
198 uchar *ptr;
199 uchar bytes[2];
200 }converter_t;
201 /* We use this union to do type conversions. This is better optimized than
202 * type casts in gcc 3.4.3 and much better than using bit shifts to build
203 * ints from chars. Byte ordering is not a problem on an 8 bit platform.
204 */
205
206 /* ------------------------------------------------------------------------- */
207
208 #if USB_CFG_HAVE_INTRIN_ENDPOINT
209 USB_PUBLIC void usbSetInterrupt(uchar *data, uchar len)
210 {
211 uchar *p, i;
212
213 #if USB_CFG_IMPLEMENT_HALT
214 if(usbTxLen1 == USBPID_STALL)
215 return;
216 #endif
217 #if 0 /* No runtime checks! Caller is responsible for valid data! */
218 if(len > 8) /* interrupt transfers are limited to 8 bytes */
219 len = 8;
220 #endif
221 if(usbTxLen1 & 0x10){ /* packet buffer was empty */
222 usbTxBuf1[0] ^= USBPID_DATA0 ^ USBPID_DATA1; /* toggle token */
223 }else{
224 usbTxLen1 = USBPID_NAK; /* avoid sending outdated (overwritten) interrupt data */
225 }
226 p = usbTxBuf1 + 1;
227 for(i=len;i--;)
228 *p++ = *data++;
229 usbCrc16Append(&usbTxBuf1[1], len);
230 usbTxLen1 = len + 4; /* len must be given including sync byte */
231 DBG2(0x21, usbTxBuf1, len + 3);
232 }
233 #endif
234
235 #if USB_CFG_HAVE_INTRIN_ENDPOINT3
236 USB_PUBLIC void usbSetInterrupt3(uchar *data, uchar len)
237 {
238 uchar *p, i;
239
240 if(usbTxLen3 & 0x10){ /* packet buffer was empty */
241 usbTxBuf3[0] ^= USBPID_DATA0 ^ USBPID_DATA1; /* toggle token */
242 }else{
243 usbTxLen3 = USBPID_NAK; /* avoid sending outdated (overwritten) interrupt data */
244 }
245 p = usbTxBuf3 + 1;
246 for(i=len;i--;)
247 *p++ = *data++;
248 usbCrc16Append(&usbTxBuf3[1], len);
249 usbTxLen3 = len + 4; /* len must be given including sync byte */
250 DBG2(0x23, usbTxBuf3, len + 3);
251 }
252 #endif
253
254
255 static uchar usbRead(uchar *data, uchar len)
256 {
257 #if USB_CFG_IMPLEMENT_FN_READ
258 if(usbMsgFlags & USB_FLG_USE_DEFAULT_RW){
259 #endif
260 uchar i = len, *r = usbMsgPtr;
261 if(usbMsgFlags & USB_FLG_MSGPTR_IS_ROM){ /* ROM data */
262 while(i--){
263 uchar c = PRG_RDB(r); /* assign to char size variable to enforce byte ops */
264 *data++ = c;
265 r++;
266 }
267 }else{ /* RAM data */
268 while(i--)
269 *data++ = *r++;
270 }
271 usbMsgPtr = r;
272 return len;
273 #if USB_CFG_IMPLEMENT_FN_READ
274 }else{
275 if(len != 0) /* don't bother app with 0 sized reads */
276 return usbFunctionRead(data, len);
277 return 0;
278 }
279 #endif
280 }
281
282
283 #define GET_DESCRIPTOR(cfgProp, staticName) \
284 if(cfgProp){ \
285 if((cfgProp) & USB_PROP_IS_RAM) \
286 flags &= ~USB_FLG_MSGPTR_IS_ROM; \
287 if((cfgProp) & USB_PROP_IS_DYNAMIC){ \
288 replyLen = usbFunctionDescriptor(rq); \
289 }else{ \
290 replyData = (uchar *)(staticName); \
291 SET_REPLY_LEN((cfgProp) & 0xff); \
292 } \
293 }
294 /* We use if() instead of #if in the macro above because #if can't be used
295 * in macros and the compiler optimizes constant conditions anyway.
296 */
297
298
299 /* Don't make this function static to avoid inlining.
300 * The entire function would become too large and exceed the range of
301 * relative jumps.
302 * 2006-02-25: Either gcc 3.4.3 is better than the gcc used when the comment
303 * above was written, or other parts of the code have changed. We now get
304 * better results with an inlined function. Test condition: PowerSwitch code.
305 */
306 static void usbProcessRx(uchar *data, uchar len)
307 {
308 usbRequest_t *rq = (void *)data;
309 uchar replyLen = 0, flags = USB_FLG_USE_DEFAULT_RW;
310 /* We use if() cascades because the compare is done byte-wise while switch()
311 * is int-based. The if() cascades are therefore more efficient.
312 */
313 /* usbRxToken can be:
314 * 0x2d 00101101 (USBPID_SETUP for endpoint 0)
315 * 0xe1 11100001 (USBPID_OUT for endpoint 0)
316 * 0xff 11111111 (USBPID_OUT for endpoint 1)
317 */
318 DBG2(0x10 + ((usbRxToken >> 1) & 3), data, len); /* SETUP0=12; OUT0=10; OUT1=13 */
319 #if USB_CFG_IMPLEMENT_FN_WRITEOUT
320 if(usbRxToken == 0xff){
321 usbFunctionWriteOut(data, len);
322 return; /* no reply expected, hence no usbMsgPtr, usbMsgFlags, usbMsgLen set */
323 }
324 #endif
325 if(usbRxToken == (uchar)USBPID_SETUP){
326 usbTxLen = USBPID_NAK; /* abort pending transmit */
327 if(len == 8){ /* Setup size must be always 8 bytes. Ignore otherwise. */
328 uchar type = rq->bmRequestType & USBRQ_TYPE_MASK;
329 if(type == USBRQ_TYPE_STANDARD){
330 #define SET_REPLY_LEN(len) replyLen = (len); usbMsgPtr = replyData
331 /* This macro ensures that replyLen and usbMsgPtr are always set in the same way.
332 * That allows optimization of common code in if() branches */
333 uchar *replyData = usbTxBuf + 9; /* there is 3 bytes free space at the end of the buffer */
334 replyData[0] = 0; /* common to USBRQ_GET_STATUS and USBRQ_GET_INTERFACE */
335 if(rq->bRequest == USBRQ_GET_STATUS){ /* 0 */
336 uchar __attribute__((__unused__)) recipient = rq->bmRequestType & USBRQ_RCPT_MASK; /* assign arith ops to variables to enforce byte size */
337 #if USB_CFG_IS_SELF_POWERED
338 if(recipient == USBRQ_RCPT_DEVICE)
339 replyData[0] = USB_CFG_IS_SELF_POWERED;
340 #endif
341 #if USB_CFG_HAVE_INTRIN_ENDPOINT && USB_CFG_IMPLEMENT_HALT
342 if(recipient == USBRQ_RCPT_ENDPOINT && rq->wIndex.bytes[0] == 0x81) /* request status for endpoint 1 */
343 replyData[0] = usbTxLen1 == USBPID_STALL;
344 #endif
345 replyData[1] = 0;
346 SET_REPLY_LEN(2);
347 }else if(rq->bRequest == USBRQ_SET_ADDRESS){ /* 5 */
348 usbNewDeviceAddr = rq->wValue.bytes[0];
349 }else if(rq->bRequest == USBRQ_GET_DESCRIPTOR){ /* 6 */
350 flags = USB_FLG_MSGPTR_IS_ROM | USB_FLG_USE_DEFAULT_RW;
351 if(rq->wValue.bytes[1] == USBDESCR_DEVICE){ /* 1 */
352 GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_DEVICE, usbDescriptorDevice)
353 }else if(rq->wValue.bytes[1] == USBDESCR_CONFIG){ /* 2 */
354 GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_CONFIGURATION, usbDescriptorConfiguration)
355 }else if(rq->wValue.bytes[1] == USBDESCR_STRING){ /* 3 */
356 #if USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC
357 if(USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_RAM)
358 flags &= ~USB_FLG_MSGPTR_IS_ROM;
359 replyLen = usbFunctionDescriptor(rq);
360 #else /* USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC */
361 if(rq->wValue.bytes[0] == 0){ /* descriptor index */
362 GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_0, usbDescriptorString0)
363 }else if(rq->wValue.bytes[0] == 1){
364 GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_VENDOR, usbDescriptorStringVendor)
365 }else if(rq->wValue.bytes[0] == 2){
366 GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_PRODUCT, usbDescriptorStringDevice)
367 }else if(rq->wValue.bytes[0] == 3){
368 GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER, usbDescriptorStringSerialNumber)
369 }else if(USB_CFG_DESCR_PROPS_UNKNOWN & USB_PROP_IS_DYNAMIC){
370 replyLen = usbFunctionDescriptor(rq);
371 }
372 #endif /* USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC */
373 }else if(rq->wValue.bytes[1] == USBDESCR_HID){ /* 0x21 */
374 GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_HID, usbDescriptorConfiguration + 18)
375 }else if(rq->wValue.bytes[1] == USBDESCR_HID_REPORT){ /* 0x22 */
376 GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_HID_REPORT, usbDescriptorHidReport)
377 }else if(USB_CFG_DESCR_PROPS_UNKNOWN & USB_PROP_IS_DYNAMIC){
378 replyLen = usbFunctionDescriptor(rq);
379 }
380 }else if(rq->bRequest == USBRQ_GET_CONFIGURATION){ /* 8 */
381 replyData = &usbConfiguration; /* send current configuration value */
382 SET_REPLY_LEN(1);
383 }else if(rq->bRequest == USBRQ_SET_CONFIGURATION){ /* 9 */
384 usbConfiguration = rq->wValue.bytes[0];
385 #if USB_CFG_IMPLEMENT_HALT
386 usbTxLen1 = USBPID_NAK;
387 #endif
388 }else if(rq->bRequest == USBRQ_GET_INTERFACE){ /* 10 */
389 SET_REPLY_LEN(1);
390 #if USB_CFG_HAVE_INTRIN_ENDPOINT
391 }else if(rq->bRequest == USBRQ_SET_INTERFACE){ /* 11 */
392 USB_SET_DATATOKEN1(USBPID_DATA0); /* reset data toggling for interrupt endpoint */
393 # if USB_CFG_HAVE_INTRIN_ENDPOINT3
394 USB_SET_DATATOKEN3(USBPID_DATA0); /* reset data toggling for interrupt endpoint */
395 # endif
396 # if USB_CFG_IMPLEMENT_HALT
397 usbTxLen1 = USBPID_NAK;
398 }else if(rq->bRequest == USBRQ_CLEAR_FEATURE || rq->bRequest == USBRQ_SET_FEATURE){ /* 1|3 */
399 if(rq->wValue.bytes[0] == 0 && rq->wIndex.bytes[0] == 0x81){ /* feature 0 == HALT for endpoint == 1 */
400 usbTxLen1 = rq->bRequest == USBRQ_CLEAR_FEATURE ? USBPID_NAK : USBPID_STALL;
401 USB_SET_DATATOKEN1(USBPID_DATA0); /* reset data toggling for interrupt endpoint */
402 # if USB_CFG_HAVE_INTRIN_ENDPOINT3
403 USB_SET_DATATOKEN3(USBPID_DATA0); /* reset data toggling for interrupt endpoint */
404 # endif
405 }
406 # endif
407 #endif
408 }else{
409 /* the following requests can be ignored, send default reply */
410 /* 1: CLEAR_FEATURE, 3: SET_FEATURE, 7: SET_DESCRIPTOR */
411 /* 12: SYNCH_FRAME */
412 }
413 #undef SET_REPLY_LEN
414 }else{ /* not a standard request -- must be vendor or class request */
415 replyLen = usbFunctionSetup(data);
416 }
417 #if USB_CFG_IMPLEMENT_FN_READ || USB_CFG_IMPLEMENT_FN_WRITE
418 if(replyLen == 0xff){ /* use user-supplied read/write function */
419 if((rq->bmRequestType & USBRQ_DIR_MASK) == USBRQ_DIR_DEVICE_TO_HOST){
420 replyLen = rq->wLength.bytes[0]; /* IN transfers only */
421 }
422 flags &= ~USB_FLG_USE_DEFAULT_RW; /* we have no valid msg, use user supplied read/write functions */
423 }else /* The 'else' prevents that we limit a replyLen of 0xff to the maximum transfer len. */
424 #endif
425 if(!rq->wLength.bytes[1] && replyLen > rq->wLength.bytes[0]) /* limit length to max */
426 replyLen = rq->wLength.bytes[0];
427 }
428 /* make sure that data packets which are sent as ACK to an OUT transfer are always zero sized */
429 }else{ /* DATA packet from out request */
430 #if USB_CFG_IMPLEMENT_FN_WRITE
431 if(!(usbMsgFlags & USB_FLG_USE_DEFAULT_RW)){
432 uchar rval = usbFunctionWrite(data, len);
433 replyLen = 0xff;
434 if(rval == 0xff){ /* an error occurred */
435 usbMsgLen = 0xff; /* cancel potentially pending data packet for ACK */
436 usbTxLen = USBPID_STALL;
437 }else if(rval != 0){ /* This was the final package */
438 replyLen = 0; /* answer with a zero-sized data packet */
439 }
440 flags = 0; /* start with a DATA1 package, stay with user supplied write() function */
441 }
442 #endif
443 }
444 usbMsgFlags = flags;
445 usbMsgLen = replyLen;
446 }
447
448 /* ------------------------------------------------------------------------- */
449
450 static void usbBuildTxBlock(void)
451 {
452 uchar wantLen, len, txLen, token;
453
454 wantLen = usbMsgLen;
455 if(wantLen > 8)
456 wantLen = 8;
457 usbMsgLen -= wantLen;
458 token = USBPID_DATA1;
459 if(usbMsgFlags & USB_FLG_TX_PACKET)
460 token = USBPID_DATA0;
461 usbMsgFlags++;
462 len = usbRead(usbTxBuf + 1, wantLen);
463 if(len <= 8){ /* valid data packet */
464 usbCrc16Append(&usbTxBuf[1], len);
465 txLen = len + 4; /* length including sync byte */
466 if(len < 8) /* a partial package identifies end of message */
467 usbMsgLen = 0xff;
468 }else{
469 txLen = USBPID_STALL; /* stall the endpoint */
470 usbMsgLen = 0xff;
471 }
472 usbTxBuf[0] = token;
473 usbTxLen = txLen;
474 DBG2(0x20, usbTxBuf, txLen-1);
475 }
476
477 static inline uchar isNotSE0(void)
478 {
479 uchar rval;
480 /* We want to do
481 * return (USBIN & USBMASK);
482 * here, but the compiler does int-expansion acrobatics.
483 * We can avoid this by assigning to a char-sized variable.
484 */
485 rval = USBIN & USBMASK;
486 return rval;
487 }
488
489 /* ------------------------------------------------------------------------- */
490
491 USB_PUBLIC void usbPoll(void)
492 {
493 schar len;
494 uchar i;
495
496 if((len = usbRxLen) > 0){
497 /* We could check CRC16 here -- but ACK has already been sent anyway. If you
498 * need data integrity checks with this driver, check the CRC in your app
499 * code and report errors back to the host. Since the ACK was already sent,
500 * retries must be handled on application level.
501 * unsigned crc = usbCrc16(buffer + 1, usbRxLen - 3);
502 */
503 usbProcessRx(usbRxBuf + USB_BUFSIZE + 1 - usbInputBufOffset, len - 3);
504 #if USB_CFG_HAVE_FLOWCONTROL
505 if(usbRxLen > 0) /* only mark as available if not inactivated */
506 usbRxLen = 0;
507 #else
508 usbRxLen = 0; /* mark rx buffer as available */
509 #endif
510 }
511 if(usbTxLen & 0x10){ /* transmit system idle */
512 if(usbMsgLen != 0xff){ /* transmit data pending? */
513 usbBuildTxBlock();
514 }
515 }
516 for(i = 10; i > 0; i--){
517 if(isNotSE0())
518 break;
519 }
520 if(i == 0){ /* RESET condition, called multiple times during reset */
521 usbNewDeviceAddr = 0;
522 usbDeviceAddr = 0;
523 #if USB_CFG_IMPLEMENT_HALT
524 usbTxLen1 = USBPID_NAK;
525 #if USB_CFG_HAVE_INTRIN_ENDPOINT3
526 usbTxLen3 = USBPID_NAK;
527 #endif
528 #endif
529 DBG1(0xff, 0, 0);
530 }
531 }
532
533 /* ------------------------------------------------------------------------- */
534
535 USB_PUBLIC void usbInit(void)
536 {
537 #if USB_INTR_CFG_SET != 0
538 USB_INTR_CFG |= USB_INTR_CFG_SET;
539 #endif
540 #if USB_INTR_CFG_CLR != 0
541 USB_INTR_CFG &= ~(USB_INTR_CFG_CLR);
542 #endif
543 USB_INTR_ENABLE |= (1 << USB_INTR_ENABLE_BIT);
544 #if USB_CFG_HAVE_INTRIN_ENDPOINT
545 USB_SET_DATATOKEN1(USBPID_DATA0); /* reset data toggling for interrupt endpoint */
546 # if USB_CFG_HAVE_INTRIN_ENDPOINT3
547 USB_SET_DATATOKEN3(USBPID_DATA0); /* reset data toggling for interrupt endpoint */
548 # endif
549 #endif
550 }
551
552 /* ------------------------------------------------------------------------- */
USB isp AVR programmer