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1 /*
2  * This file is part of the sigrok project.
3  *
4  * Copyright (C) 2010-2012 Håvard Espeland <gus@ping.uio.no>,
5  * Copyright (C) 2010 Martin Stensgård <mastensg@ping.uio.no>
6  * Copyright (C) 2010 Carl Henrik Lunde <chlunde@ping.uio.no>
7  *
8  * This program is free software: you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation, either version 3 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
20  */
21
22 /*
23  * ASIX SIGMA/SIGMA2 logic analyzer driver
24  */
25
26 #include <glib.h>
27 #include <glib/gstdio.h>
28 #include <ftdi.h>
29 #include <string.h>
30 #include "libsigrok.h"
31 #include "libsigrok-internal.h"
32 #include "asix-sigma.h"
33
34 #define USB_VENDOR                      0xa600
35 #define USB_PRODUCT                     0xa000
36 #define USB_DESCRIPTION                 "ASIX SIGMA"
37 #define USB_VENDOR_NAME                 "ASIX"
38 #define USB_MODEL_NAME                  "SIGMA"
39 #define USB_MODEL_VERSION               ""
40 #define TRIGGER_TYPE                    "rf10"
41 #define NUM_PROBES                      16
42
43 SR_PRIV struct sr_dev_driver asix_sigma_driver_info;
44 static struct sr_dev_driver *di = &asix_sigma_driver_info;
45 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
46
47 static const uint64_t supported_samplerates[] = {
48         SR_KHZ(200),
49         SR_KHZ(250),
50         SR_KHZ(500),
51         SR_MHZ(1),
52         SR_MHZ(5),
53         SR_MHZ(10),
54         SR_MHZ(25),
55         SR_MHZ(50),
56         SR_MHZ(100),
57         SR_MHZ(200),
58         0,
59 };
60
61 /*
62  * Probe numbers seem to go from 1-16, according to this image:
63  * http://tools.asix.net/img/sigma_sigmacab_pins_720.jpg
64  * (the cable has two additional GND pins, and a TI and TO pin)
65  */
66 static const char *probe_names[NUM_PROBES + 1] = {
67         "1", "2", "3", "4", "5", "6", "7", "8",
68         "9", "10", "11", "12", "13", "14", "15", "16",
69         NULL,
70 };
71
72 static const struct sr_samplerates samplerates = {
73         0,
74         0,
75         0,
76         supported_samplerates,
77 };
78
79 static const int hwcaps[] = {
80         SR_CONF_LOGIC_ANALYZER,
81         SR_CONF_SAMPLERATE,
82         SR_CONF_CAPTURE_RATIO,
83
84         SR_CONF_LIMIT_MSEC,
85         0,
86 };
87
88 /* Force the FPGA to reboot. */
89 static uint8_t suicide[] = {
90         0x84, 0x84, 0x88, 0x84, 0x88, 0x84, 0x88, 0x84,
91 };
92
93 /* Prepare to upload firmware (FPGA specific). */
94 static uint8_t init[] = {
95         0x03, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
96 };
97
98 /* Initialize the logic analyzer mode. */
99 static uint8_t logic_mode_start[] = {
100         0x00, 0x40, 0x0f, 0x25, 0x35, 0x40,
101         0x2a, 0x3a, 0x40, 0x03, 0x20, 0x38,
102 };
103
104 static const char *firmware_files[] = {
105         "asix-sigma-50.fw",     /* 50 MHz, supports 8 bit fractions */
106         "asix-sigma-100.fw",    /* 100 MHz */
107         "asix-sigma-200.fw",    /* 200 MHz */
108         "asix-sigma-50sync.fw", /* Synchronous clock from pin */
109         "asix-sigma-phasor.fw", /* Frequency counter */
110 };
111
112 static int sigma_read(void *buf, size_t size, struct dev_context *devc)
113 {
114         int ret;
115
116         ret = ftdi_read_data(&devc->ftdic, (unsigned char *)buf, size);
117         if (ret < 0) {
118                 sr_err("ftdi_read_data failed: %s",
119                        ftdi_get_error_string(&devc->ftdic));
120         }
121
122         return ret;
123 }
124
125 static int sigma_write(void *buf, size_t size, struct dev_context *devc)
126 {
127         int ret;
128
129         ret = ftdi_write_data(&devc->ftdic, (unsigned char *)buf, size);
130         if (ret < 0) {
131                 sr_err("ftdi_write_data failed: %s",
132                        ftdi_get_error_string(&devc->ftdic));
133         } else if ((size_t) ret != size) {
134                 sr_err("ftdi_write_data did not complete write.");
135         }
136
137         return ret;
138 }
139
140 static int sigma_write_register(uint8_t reg, uint8_t *data, size_t len,
141                                 struct dev_context *devc)
142 {
143         size_t i;
144         uint8_t buf[len + 2];
145         int idx = 0;
146
147         buf[idx++] = REG_ADDR_LOW | (reg & 0xf);
148         buf[idx++] = REG_ADDR_HIGH | (reg >> 4);
149
150         for (i = 0; i < len; ++i) {
151                 buf[idx++] = REG_DATA_LOW | (data[i] & 0xf);
152                 buf[idx++] = REG_DATA_HIGH_WRITE | (data[i] >> 4);
153         }
154
155         return sigma_write(buf, idx, devc);
156 }
157
158 static int sigma_set_register(uint8_t reg, uint8_t value, struct dev_context *devc)
159 {
160         return sigma_write_register(reg, &value, 1, devc);
161 }
162
163 static int sigma_read_register(uint8_t reg, uint8_t *data, size_t len,
164                                struct dev_context *devc)
165 {
166         uint8_t buf[3];
167
168         buf[0] = REG_ADDR_LOW | (reg & 0xf);
169         buf[1] = REG_ADDR_HIGH | (reg >> 4);
170         buf[2] = REG_READ_ADDR;
171
172         sigma_write(buf, sizeof(buf), devc);
173
174         return sigma_read(data, len, devc);
175 }
176
177 static uint8_t sigma_get_register(uint8_t reg, struct dev_context *devc)
178 {
179         uint8_t value;
180
181         if (1 != sigma_read_register(reg, &value, 1, devc)) {
182                 sr_err("sigma_get_register: 1 byte expected");
183                 return 0;
184         }
185
186         return value;
187 }
188
189 static int sigma_read_pos(uint32_t *stoppos, uint32_t *triggerpos,
190                           struct dev_context *devc)
191 {
192         uint8_t buf[] = {
193                 REG_ADDR_LOW | READ_TRIGGER_POS_LOW,
194
195                 REG_READ_ADDR | NEXT_REG,
196                 REG_READ_ADDR | NEXT_REG,
197                 REG_READ_ADDR | NEXT_REG,
198                 REG_READ_ADDR | NEXT_REG,
199                 REG_READ_ADDR | NEXT_REG,
200                 REG_READ_ADDR | NEXT_REG,
201         };
202         uint8_t result[6];
203
204         sigma_write(buf, sizeof(buf), devc);
205
206         sigma_read(result, sizeof(result), devc);
207
208         *triggerpos = result[0] | (result[1] << 8) | (result[2] << 16);
209         *stoppos = result[3] | (result[4] << 8) | (result[5] << 16);
210
211         /* Not really sure why this must be done, but according to spec. */
212         if ((--*stoppos & 0x1ff) == 0x1ff)
213                 stoppos -= 64;
214
215         if ((*--triggerpos & 0x1ff) == 0x1ff)
216                 triggerpos -= 64;
217
218         return 1;
219 }
220
221 static int sigma_read_dram(uint16_t startchunk, size_t numchunks,
222                            uint8_t *data, struct dev_context *devc)
223 {
224         size_t i;
225         uint8_t buf[4096];
226         int idx = 0;
227
228         /* Send the startchunk. Index start with 1. */
229         buf[0] = startchunk >> 8;
230         buf[1] = startchunk & 0xff;
231         sigma_write_register(WRITE_MEMROW, buf, 2, devc);
232
233         /* Read the DRAM. */
234         buf[idx++] = REG_DRAM_BLOCK;
235         buf[idx++] = REG_DRAM_WAIT_ACK;
236
237         for (i = 0; i < numchunks; ++i) {
238                 /* Alternate bit to copy from DRAM to cache. */
239                 if (i != (numchunks - 1))
240                         buf[idx++] = REG_DRAM_BLOCK | (((i + 1) % 2) << 4);
241
242                 buf[idx++] = REG_DRAM_BLOCK_DATA | ((i % 2) << 4);
243
244                 if (i != (numchunks - 1))
245                         buf[idx++] = REG_DRAM_WAIT_ACK;
246         }
247
248         sigma_write(buf, idx, devc);
249
250         return sigma_read(data, numchunks * CHUNK_SIZE, devc);
251 }
252
253 /* Upload trigger look-up tables to Sigma. */
254 static int sigma_write_trigger_lut(struct triggerlut *lut, struct dev_context *devc)
255 {
256         int i;
257         uint8_t tmp[2];
258         uint16_t bit;
259
260         /* Transpose the table and send to Sigma. */
261         for (i = 0; i < 16; ++i) {
262                 bit = 1 << i;
263
264                 tmp[0] = tmp[1] = 0;
265
266                 if (lut->m2d[0] & bit)
267                         tmp[0] |= 0x01;
268                 if (lut->m2d[1] & bit)
269                         tmp[0] |= 0x02;
270                 if (lut->m2d[2] & bit)
271                         tmp[0] |= 0x04;
272                 if (lut->m2d[3] & bit)
273                         tmp[0] |= 0x08;
274
275                 if (lut->m3 & bit)
276                         tmp[0] |= 0x10;
277                 if (lut->m3s & bit)
278                         tmp[0] |= 0x20;
279                 if (lut->m4 & bit)
280                         tmp[0] |= 0x40;
281
282                 if (lut->m0d[0] & bit)
283                         tmp[1] |= 0x01;
284                 if (lut->m0d[1] & bit)
285                         tmp[1] |= 0x02;
286                 if (lut->m0d[2] & bit)
287                         tmp[1] |= 0x04;
288                 if (lut->m0d[3] & bit)
289                         tmp[1] |= 0x08;
290
291                 if (lut->m1d[0] & bit)
292                         tmp[1] |= 0x10;
293                 if (lut->m1d[1] & bit)
294                         tmp[1] |= 0x20;
295                 if (lut->m1d[2] & bit)
296                         tmp[1] |= 0x40;
297                 if (lut->m1d[3] & bit)
298                         tmp[1] |= 0x80;
299
300                 sigma_write_register(WRITE_TRIGGER_SELECT0, tmp, sizeof(tmp),
301                                      devc);
302                 sigma_set_register(WRITE_TRIGGER_SELECT1, 0x30 | i, devc);
303         }
304
305         /* Send the parameters */
306         sigma_write_register(WRITE_TRIGGER_SELECT0, (uint8_t *) &lut->params,
307                              sizeof(lut->params), devc);
308
309         return SR_OK;
310 }
311
312 /* Generate the bitbang stream for programming the FPGA. */
313 static int bin2bitbang(const char *filename,
314                        unsigned char **buf, size_t *buf_size)
315 {
316         FILE *f;
317         unsigned long file_size;
318         unsigned long offset = 0;
319         unsigned char *p;
320         uint8_t *firmware;
321         unsigned long fwsize = 0;
322         const int buffer_size = 65536;
323         size_t i;
324         int c, bit, v;
325         uint32_t imm = 0x3f6df2ab;
326
327         f = g_fopen(filename, "rb");
328         if (!f) {
329                 sr_err("g_fopen(\"%s\", \"rb\")", filename);
330                 return SR_ERR;
331         }
332
333         if (-1 == fseek(f, 0, SEEK_END)) {
334                 sr_err("fseek on %s failed", filename);
335                 fclose(f);
336                 return SR_ERR;
337         }
338
339         file_size = ftell(f);
340
341         fseek(f, 0, SEEK_SET);
342
343         if (!(firmware = g_try_malloc(buffer_size))) {
344                 sr_err("%s: firmware malloc failed", __func__);
345                 fclose(f);
346                 return SR_ERR_MALLOC;
347         }
348
349         while ((c = getc(f)) != EOF) {
350                 imm = (imm + 0xa853753) % 177 + (imm * 0x8034052);
351                 firmware[fwsize++] = c ^ imm;
352         }
353         fclose(f);
354
355         if(fwsize != file_size) {
356             sr_err("%s: Error reading firmware", filename);
357             fclose(f);
358             g_free(firmware);
359             return SR_ERR;
360         }
361
362         *buf_size = fwsize * 2 * 8;
363
364         *buf = p = (unsigned char *)g_try_malloc(*buf_size);
365         if (!p) {
366                 sr_err("%s: buf/p malloc failed", __func__);
367                 g_free(firmware);
368                 return SR_ERR_MALLOC;
369         }
370
371         for (i = 0; i < fwsize; ++i) {
372                 for (bit = 7; bit >= 0; --bit) {
373                         v = firmware[i] & 1 << bit ? 0x40 : 0x00;
374                         p[offset++] = v | 0x01;
375                         p[offset++] = v;
376                 }
377         }
378
379         g_free(firmware);
380
381         if (offset != *buf_size) {
382                 g_free(*buf);
383                 sr_err("Error reading firmware %s "
384                        "offset=%ld, file_size=%ld, buf_size=%zd.",
385                        filename, offset, file_size, *buf_size);
386
387                 return SR_ERR;
388         }
389
390         return SR_OK;
391 }
392
393 static int clear_instances(void)
394 {
395         GSList *l;
396         struct sr_dev_inst *sdi;
397         struct drv_context *drvc;
398         struct dev_context *devc;
399
400         drvc = di->priv;
401
402         /* Properly close all devices. */
403         for (l = drvc->instances; l; l = l->next) {
404                 if (!(sdi = l->data)) {
405                         /* Log error, but continue cleaning up the rest. */
406                         sr_err("%s: sdi was NULL, continuing", __func__);
407                         continue;
408                 }
409                 if (sdi->priv) {
410                         devc = sdi->priv;
411                         ftdi_free(&devc->ftdic);
412                 }
413                 sr_dev_inst_free(sdi);
414         }
415         g_slist_free(drvc->instances);
416         drvc->instances = NULL;
417
418         return SR_OK;
419 }
420
421 static int hw_init(struct sr_context *sr_ctx)
422 {
423         struct drv_context *drvc;
424
425         if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
426                 sr_err("Driver context malloc failed.");
427                 return SR_ERR_MALLOC;
428         }
429         drvc->sr_ctx = sr_ctx;
430         di->priv = drvc;
431
432         return SR_OK;
433 }
434
435 static GSList *hw_scan(GSList *options)
436 {
437         struct sr_dev_inst *sdi;
438         struct sr_probe *probe;
439         struct drv_context *drvc;
440         struct dev_context *devc;
441         GSList *devices;
442         struct ftdi_device_list *devlist;
443         char serial_txt[10];
444         uint32_t serial;
445         int ret, i;
446
447         (void)options;
448
449         drvc = di->priv;
450         devices = NULL;
451         clear_instances();
452
453         if (!(devc = g_try_malloc(sizeof(struct dev_context)))) {
454                 sr_err("%s: devc malloc failed", __func__);
455                 return NULL;
456         }
457
458         ftdi_init(&devc->ftdic);
459
460         /* Look for SIGMAs. */
461
462         if ((ret = ftdi_usb_find_all(&devc->ftdic, &devlist,
463             USB_VENDOR, USB_PRODUCT)) <= 0) {
464                 if (ret < 0)
465                         sr_err("ftdi_usb_find_all(): %d", ret);
466                 goto free;
467         }
468
469         /* Make sure it's a version 1 or 2 SIGMA. */
470         ftdi_usb_get_strings(&devc->ftdic, devlist->dev, NULL, 0, NULL, 0,
471                              serial_txt, sizeof(serial_txt));
472         sscanf(serial_txt, "%x", &serial);
473
474         if (serial < 0xa6010000 || serial > 0xa602ffff) {
475                 sr_err("Only SIGMA and SIGMA2 are supported "
476                        "in this version of libsigrok.");
477                 goto free;
478         }
479
480         sr_info("Found ASIX SIGMA - Serial: %s", serial_txt);
481
482         devc->cur_samplerate = 0;
483         devc->period_ps = 0;
484         devc->limit_msec = 0;
485         devc->cur_firmware = -1;
486         devc->num_probes = 0;
487         devc->samples_per_event = 0;
488         devc->capture_ratio = 50;
489         devc->use_triggers = 0;
490
491         /* Register SIGMA device. */
492         if (!(sdi = sr_dev_inst_new(0, SR_ST_INITIALIZING, USB_VENDOR_NAME,
493                                     USB_MODEL_NAME, USB_MODEL_VERSION))) {
494                 sr_err("%s: sdi was NULL", __func__);
495                 goto free;
496         }
497         sdi->driver = di;
498
499         for (i = 0; probe_names[i]; i++) {
500                 if (!(probe = sr_probe_new(i, SR_PROBE_LOGIC, TRUE,
501                                 probe_names[i])))
502                         return NULL;
503                 sdi->probes = g_slist_append(sdi->probes, probe);
504         }
505
506         devices = g_slist_append(devices, sdi);
507         drvc->instances = g_slist_append(drvc->instances, sdi);
508         sdi->priv = devc;
509
510         /* We will open the device again when we need it. */
511         ftdi_list_free(&devlist);
512
513         return devices;
514
515 free:
516         ftdi_deinit(&devc->ftdic);
517         g_free(devc);
518         return NULL;
519 }
520
521 static GSList *hw_dev_list(void)
522 {
523         struct drv_context *drvc;
524
525         drvc = di->priv;
526
527         return drvc->instances;
528 }
529
530 static int upload_firmware(int firmware_idx, struct dev_context *devc)
531 {
532         int ret;
533         unsigned char *buf;
534         unsigned char pins;
535         size_t buf_size;
536         unsigned char result[32];
537         char firmware_path[128];
538
539         /* Make sure it's an ASIX SIGMA. */
540         if ((ret = ftdi_usb_open_desc(&devc->ftdic,
541                 USB_VENDOR, USB_PRODUCT, USB_DESCRIPTION, NULL)) < 0) {
542                 sr_err("ftdi_usb_open failed: %s",
543                        ftdi_get_error_string(&devc->ftdic));
544                 return 0;
545         }
546
547         if ((ret = ftdi_set_bitmode(&devc->ftdic, 0xdf, BITMODE_BITBANG)) < 0) {
548                 sr_err("ftdi_set_bitmode failed: %s",
549                        ftdi_get_error_string(&devc->ftdic));
550                 return 0;
551         }
552
553         /* Four times the speed of sigmalogan - Works well. */
554         if ((ret = ftdi_set_baudrate(&devc->ftdic, 750000)) < 0) {
555                 sr_err("ftdi_set_baudrate failed: %s",
556                        ftdi_get_error_string(&devc->ftdic));
557                 return 0;
558         }
559
560         /* Force the FPGA to reboot. */
561         sigma_write(suicide, sizeof(suicide), devc);
562         sigma_write(suicide, sizeof(suicide), devc);
563         sigma_write(suicide, sizeof(suicide), devc);
564         sigma_write(suicide, sizeof(suicide), devc);
565
566         /* Prepare to upload firmware (FPGA specific). */
567         sigma_write(init, sizeof(init), devc);
568
569         ftdi_usb_purge_buffers(&devc->ftdic);
570
571         /* Wait until the FPGA asserts INIT_B. */
572         while (1) {
573                 ret = sigma_read(result, 1, devc);
574                 if (result[0] & 0x20)
575                         break;
576         }
577
578         /* Prepare firmware. */
579         snprintf(firmware_path, sizeof(firmware_path), "%s/%s", FIRMWARE_DIR,
580                  firmware_files[firmware_idx]);
581
582         if ((ret = bin2bitbang(firmware_path, &buf, &buf_size)) != SR_OK) {
583                 sr_err("An error occured while reading the firmware: %s",
584                        firmware_path);
585                 return ret;
586         }
587
588         /* Upload firmare. */
589         sr_info("Uploading firmware file '%s'.", firmware_files[firmware_idx]);
590         sigma_write(buf, buf_size, devc);
591
592         g_free(buf);
593
594         if ((ret = ftdi_set_bitmode(&devc->ftdic, 0x00, BITMODE_RESET)) < 0) {
595                 sr_err("ftdi_set_bitmode failed: %s",
596                        ftdi_get_error_string(&devc->ftdic));
597                 return SR_ERR;
598         }
599
600         ftdi_usb_purge_buffers(&devc->ftdic);
601
602         /* Discard garbage. */
603         while (1 == sigma_read(&pins, 1, devc))
604                 ;
605
606         /* Initialize the logic analyzer mode. */
607         sigma_write(logic_mode_start, sizeof(logic_mode_start), devc);
608
609         /* Expect a 3 byte reply. */
610         ret = sigma_read(result, 3, devc);
611         if (ret != 3 ||
612             result[0] != 0xa6 || result[1] != 0x55 || result[2] != 0xaa) {
613                 sr_err("Configuration failed. Invalid reply received.");
614                 return SR_ERR;
615         }
616
617         devc->cur_firmware = firmware_idx;
618
619         sr_info("Firmware uploaded.");
620
621         return SR_OK;
622 }
623
624 static int hw_dev_open(struct sr_dev_inst *sdi)
625 {
626         struct dev_context *devc;
627         int ret;
628
629         devc = sdi->priv;
630
631         /* Make sure it's an ASIX SIGMA. */
632         if ((ret = ftdi_usb_open_desc(&devc->ftdic,
633                 USB_VENDOR, USB_PRODUCT, USB_DESCRIPTION, NULL)) < 0) {
634
635                 sr_err("ftdi_usb_open failed: %s",
636                        ftdi_get_error_string(&devc->ftdic));
637
638                 return 0;
639         }
640
641         sdi->status = SR_ST_ACTIVE;
642
643         return SR_OK;
644 }
645
646 static int set_samplerate(const struct sr_dev_inst *sdi, uint64_t samplerate)
647 {
648         int i, ret;
649         struct dev_context *devc = sdi->priv;
650
651         ret = SR_OK;
652
653         for (i = 0; supported_samplerates[i]; i++) {
654                 if (supported_samplerates[i] == samplerate)
655                         break;
656         }
657         if (supported_samplerates[i] == 0)
658                 return SR_ERR_SAMPLERATE;
659
660         if (samplerate <= SR_MHZ(50)) {
661                 ret = upload_firmware(0, devc);
662                 devc->num_probes = 16;
663         }
664         if (samplerate == SR_MHZ(100)) {
665                 ret = upload_firmware(1, devc);
666                 devc->num_probes = 8;
667         }
668         else if (samplerate == SR_MHZ(200)) {
669                 ret = upload_firmware(2, devc);
670                 devc->num_probes = 4;
671         }
672
673         devc->cur_samplerate = samplerate;
674         devc->period_ps = 1000000000000ULL / samplerate;
675         devc->samples_per_event = 16 / devc->num_probes;
676         devc->state.state = SIGMA_IDLE;
677
678         return ret;
679 }
680
681 /*
682  * In 100 and 200 MHz mode, only a single pin rising/falling can be
683  * set as trigger. In other modes, two rising/falling triggers can be set,
684  * in addition to value/mask trigger for any number of probes.
685  *
686  * The Sigma supports complex triggers using boolean expressions, but this
687  * has not been implemented yet.
688  */
689 static int configure_probes(const struct sr_dev_inst *sdi)
690 {
691         struct dev_context *devc = sdi->priv;
692         const struct sr_probe *probe;
693         const GSList *l;
694         int trigger_set = 0;
695         int probebit;
696
697         memset(&devc->trigger, 0, sizeof(struct sigma_trigger));
698
699         for (l = sdi->probes; l; l = l->next) {
700                 probe = (struct sr_probe *)l->data;
701                 probebit = 1 << (probe->index);
702
703                 if (!probe->enabled || !probe->trigger)
704                         continue;
705
706                 if (devc->cur_samplerate >= SR_MHZ(100)) {
707                         /* Fast trigger support. */
708                         if (trigger_set) {
709                                 sr_err("Only a single pin trigger in 100 and "
710                                        "200MHz mode is supported.");
711                                 return SR_ERR;
712                         }
713                         if (probe->trigger[0] == 'f')
714                                 devc->trigger.fallingmask |= probebit;
715                         else if (probe->trigger[0] == 'r')
716                                 devc->trigger.risingmask |= probebit;
717                         else {
718                                 sr_err("Only rising/falling trigger in 100 "
719                                        "and 200MHz mode is supported.");
720                                 return SR_ERR;
721                         }
722
723                         ++trigger_set;
724                 } else {
725                         /* Simple trigger support (event). */
726                         if (probe->trigger[0] == '1') {
727                                 devc->trigger.simplevalue |= probebit;
728                                 devc->trigger.simplemask |= probebit;
729                         }
730                         else if (probe->trigger[0] == '0') {
731                                 devc->trigger.simplevalue &= ~probebit;
732                                 devc->trigger.simplemask |= probebit;
733                         }
734                         else if (probe->trigger[0] == 'f') {
735                                 devc->trigger.fallingmask |= probebit;
736                                 ++trigger_set;
737                         }
738                         else if (probe->trigger[0] == 'r') {
739                                 devc->trigger.risingmask |= probebit;
740                                 ++trigger_set;
741                         }
742
743                         /*
744                          * Actually, Sigma supports 2 rising/falling triggers,
745                          * but they are ORed and the current trigger syntax
746                          * does not permit ORed triggers.
747                          */
748                         if (trigger_set > 1) {
749                                 sr_err("Only 1 rising/falling trigger "
750                                        "is supported.");
751                                 return SR_ERR;
752                         }
753                 }
754
755                 if (trigger_set)
756                         devc->use_triggers = 1;
757         }
758
759         return SR_OK;
760 }
761
762 static int hw_dev_close(struct sr_dev_inst *sdi)
763 {
764         struct dev_context *devc;
765
766         if (!(devc = sdi->priv)) {
767                 sr_err("%s: sdi->priv was NULL", __func__);
768                 return SR_ERR_BUG;
769         }
770
771         /* TODO */
772         if (sdi->status == SR_ST_ACTIVE)
773                 ftdi_usb_close(&devc->ftdic);
774
775         sdi->status = SR_ST_INACTIVE;
776
777         return SR_OK;
778 }
779
780 static int hw_cleanup(void)
781 {
782         if (!di->priv)
783                 return SR_OK;
784
785         clear_instances();
786
787         return SR_OK;
788 }
789
790 static int config_get(int id, const void **data, const struct sr_dev_inst *sdi)
791 {
792         struct dev_context *devc;
793
794         switch (id) {
795         case SR_DI_HWCAPS:
796                 *data = hwcaps;
797                 break;
798         case SR_CONF_SAMPLERATE:
799                 if (sdi) {
800                         devc = sdi->priv;
801                         *data = &devc->cur_samplerate;
802                 } else
803                         return SR_ERR;
804                 break;
805         default:
806                 return SR_ERR_ARG;
807         }
808
809         return SR_OK;
810 }
811
812 static int config_set(int id, const void *value, const struct sr_dev_inst *sdi)
813 {
814         struct dev_context *devc;
815         int ret;
816
817         devc = sdi->priv;
818
819         if (id == SR_CONF_SAMPLERATE) {
820                 ret = set_samplerate(sdi, *(const uint64_t *)value);
821         } else if (id == SR_CONF_LIMIT_MSEC) {
822                 devc->limit_msec = *(const uint64_t *)value;
823                 if (devc->limit_msec > 0)
824                         ret = SR_OK;
825                 else
826                         ret = SR_ERR;
827         } else if (id == SR_CONF_CAPTURE_RATIO) {
828                 devc->capture_ratio = *(const uint64_t *)value;
829                 if (devc->capture_ratio < 0 || devc->capture_ratio > 100)
830                         ret = SR_ERR;
831                 else
832                         ret = SR_OK;
833         } else {
834                 ret = SR_ERR;
835         }
836
837         return ret;
838 }
839
840 static int config_list(int key, const void **data, const struct sr_dev_inst *sdi)
841 {
842
843         (void)sdi;
844
845         switch (key) {
846         case SR_CONF_SAMPLERATE:
847                 *data = &samplerates;
848                 break;
849         case SR_CONF_TRIGGER_TYPE:
850                 *data = (char *)TRIGGER_TYPE;
851                 break;
852         default:
853                 return SR_ERR_ARG;
854         }
855
856         return SR_OK;
857 }
858
859 /* Software trigger to determine exact trigger position. */
860 static int get_trigger_offset(uint16_t *samples, uint16_t last_sample,
861                               struct sigma_trigger *t)
862 {
863         int i;
864
865         for (i = 0; i < 8; ++i) {
866                 if (i > 0)
867                         last_sample = samples[i-1];
868
869                 /* Simple triggers. */
870                 if ((samples[i] & t->simplemask) != t->simplevalue)
871                         continue;
872
873                 /* Rising edge. */
874                 if ((last_sample & t->risingmask) != 0 || (samples[i] &
875                     t->risingmask) != t->risingmask)
876                         continue;
877
878                 /* Falling edge. */
879                 if ((last_sample & t->fallingmask) != t->fallingmask ||
880                     (samples[i] & t->fallingmask) != 0)
881                         continue;
882
883                 break;
884         }
885
886         /* If we did not match, return original trigger pos. */
887         return i & 0x7;
888 }
889
890 /*
891  * Decode chunk of 1024 bytes, 64 clusters, 7 events per cluster.
892  * Each event is 20ns apart, and can contain multiple samples.
893  *
894  * For 200 MHz, events contain 4 samples for each channel, spread 5 ns apart.
895  * For 100 MHz, events contain 2 samples for each channel, spread 10 ns apart.
896  * For 50 MHz and below, events contain one sample for each channel,
897  * spread 20 ns apart.
898  */
899 static int decode_chunk_ts(uint8_t *buf, uint16_t *lastts,
900                            uint16_t *lastsample, int triggerpos,
901                            uint16_t limit_chunk, void *cb_data)
902 {
903         struct sr_dev_inst *sdi = cb_data;
904         struct dev_context *devc = sdi->priv;
905         uint16_t tsdiff, ts;
906         uint16_t samples[65536 * devc->samples_per_event];
907         struct sr_datafeed_packet packet;
908         struct sr_datafeed_logic logic;
909         int i, j, k, l, numpad, tosend;
910         size_t n = 0, sent = 0;
911         int clustersize = EVENTS_PER_CLUSTER * devc->samples_per_event;
912         uint16_t *event;
913         uint16_t cur_sample;
914         int triggerts = -1;
915
916         /* Check if trigger is in this chunk. */
917         if (triggerpos != -1) {
918                 if (devc->cur_samplerate <= SR_MHZ(50))
919                         triggerpos -= EVENTS_PER_CLUSTER - 1;
920
921                 if (triggerpos < 0)
922                         triggerpos = 0;
923
924                 /* Find in which cluster the trigger occured. */
925                 triggerts = triggerpos / 7;
926         }
927
928         /* For each ts. */
929         for (i = 0; i < 64; ++i) {
930                 ts = *(uint16_t *) &buf[i * 16];
931                 tsdiff = ts - *lastts;
932                 *lastts = ts;
933
934                 /* Decode partial chunk. */
935                 if (limit_chunk && ts > limit_chunk)
936                         return SR_OK;
937
938                 /* Pad last sample up to current point. */
939                 numpad = tsdiff * devc->samples_per_event - clustersize;
940                 if (numpad > 0) {
941                         for (j = 0; j < numpad; ++j)
942                                 samples[j] = *lastsample;
943
944                         n = numpad;
945                 }
946
947                 /* Send samples between previous and this timestamp to sigrok. */
948                 sent = 0;
949                 while (sent < n) {
950                         tosend = MIN(2048, n - sent);
951
952                         packet.type = SR_DF_LOGIC;
953                         packet.payload = &logic;
954                         logic.length = tosend * sizeof(uint16_t);
955                         logic.unitsize = 2;
956                         logic.data = samples + sent;
957                         sr_session_send(devc->session_dev_id, &packet);
958
959                         sent += tosend;
960                 }
961                 n = 0;
962
963                 event = (uint16_t *) &buf[i * 16 + 2];
964                 cur_sample = 0;
965
966                 /* For each event in cluster. */
967                 for (j = 0; j < 7; ++j) {
968
969                         /* For each sample in event. */
970                         for (k = 0; k < devc->samples_per_event; ++k) {
971                                 cur_sample = 0;
972
973                                 /* For each probe. */
974                                 for (l = 0; l < devc->num_probes; ++l)
975                                         cur_sample |= (!!(event[j] & (1 << (l *
976                                            devc->samples_per_event + k)))) << l;
977
978                                 samples[n++] = cur_sample;
979                         }
980                 }
981
982                 /* Send data up to trigger point (if triggered). */
983                 sent = 0;
984                 if (i == triggerts) {
985                         /*
986                          * Trigger is not always accurate to sample because of
987                          * pipeline delay. However, it always triggers before
988                          * the actual event. We therefore look at the next
989                          * samples to pinpoint the exact position of the trigger.
990                          */
991                         tosend = get_trigger_offset(samples, *lastsample,
992                                                     &devc->trigger);
993
994                         if (tosend > 0) {
995                                 packet.type = SR_DF_LOGIC;
996                                 packet.payload = &logic;
997                                 logic.length = tosend * sizeof(uint16_t);
998                                 logic.unitsize = 2;
999                                 logic.data = samples;
1000                                 sr_session_send(devc->session_dev_id, &packet);
1001
1002                                 sent += tosend;
1003                         }
1004
1005                         /* Only send trigger if explicitly enabled. */
1006                         if (devc->use_triggers) {
1007                                 packet.type = SR_DF_TRIGGER;
1008                                 sr_session_send(devc->session_dev_id, &packet);
1009                         }
1010                 }
1011
1012                 /* Send rest of the chunk to sigrok. */
1013                 tosend = n - sent;
1014
1015                 if (tosend > 0) {
1016                         packet.type = SR_DF_LOGIC;
1017                         packet.payload = &logic;
1018                         logic.length = tosend * sizeof(uint16_t);
1019                         logic.unitsize = 2;
1020                         logic.data = samples + sent;
1021                         sr_session_send(devc->session_dev_id, &packet);
1022                 }
1023
1024                 *lastsample = samples[n - 1];
1025         }
1026
1027         return SR_OK;
1028 }
1029
1030 static int receive_data(int fd, int revents, void *cb_data)
1031 {
1032         struct sr_dev_inst *sdi = cb_data;
1033         struct dev_context *devc = sdi->priv;
1034         struct sr_datafeed_packet packet;
1035         const int chunks_per_read = 32;
1036         unsigned char buf[chunks_per_read * CHUNK_SIZE];
1037         int bufsz, numchunks, i, newchunks;
1038         uint64_t running_msec;
1039         struct timeval tv;
1040
1041         (void)fd;
1042         (void)revents;
1043
1044         /* Get the current position. */
1045         sigma_read_pos(&devc->state.stoppos, &devc->state.triggerpos, devc);
1046
1047         numchunks = (devc->state.stoppos + 511) / 512;
1048
1049         if (devc->state.state == SIGMA_IDLE)
1050                 return TRUE;
1051
1052         if (devc->state.state == SIGMA_CAPTURE) {
1053                 /* Check if the timer has expired, or memory is full. */
1054                 gettimeofday(&tv, 0);
1055                 running_msec = (tv.tv_sec - devc->start_tv.tv_sec) * 1000 +
1056                         (tv.tv_usec - devc->start_tv.tv_usec) / 1000;
1057
1058                 if (running_msec < devc->limit_msec && numchunks < 32767)
1059                         return TRUE; /* While capturing... */
1060                 else
1061                         hw_dev_acquisition_stop(sdi, sdi);
1062
1063         }
1064
1065         if (devc->state.state == SIGMA_DOWNLOAD) {
1066                 if (devc->state.chunks_downloaded >= numchunks) {
1067                         /* End of samples. */
1068                         packet.type = SR_DF_END;
1069                         sr_session_send(devc->session_dev_id, &packet);
1070
1071                         devc->state.state = SIGMA_IDLE;
1072
1073                         return TRUE;
1074                 }
1075
1076                 newchunks = MIN(chunks_per_read,
1077                                 numchunks - devc->state.chunks_downloaded);
1078
1079                 sr_info("Downloading sample data: %.0f %%.",
1080                         100.0 * devc->state.chunks_downloaded / numchunks);
1081
1082                 bufsz = sigma_read_dram(devc->state.chunks_downloaded,
1083                                         newchunks, buf, devc);
1084                 /* TODO: Check bufsz. For now, just avoid compiler warnings. */
1085                 (void)bufsz;
1086
1087                 /* Find first ts. */
1088                 if (devc->state.chunks_downloaded == 0) {
1089                         devc->state.lastts = *(uint16_t *) buf - 1;
1090                         devc->state.lastsample = 0;
1091                 }
1092
1093                 /* Decode chunks and send them to sigrok. */
1094                 for (i = 0; i < newchunks; ++i) {
1095                         int limit_chunk = 0;
1096
1097                         /* The last chunk may potentially be only in part. */
1098                         if (devc->state.chunks_downloaded == numchunks - 1) {
1099                                 /* Find the last valid timestamp */
1100                                 limit_chunk = devc->state.stoppos % 512 + devc->state.lastts;
1101                         }
1102
1103                         if (devc->state.chunks_downloaded + i == devc->state.triggerchunk)
1104                                 decode_chunk_ts(buf + (i * CHUNK_SIZE),
1105                                                 &devc->state.lastts,
1106                                                 &devc->state.lastsample,
1107                                                 devc->state.triggerpos & 0x1ff,
1108                                                 limit_chunk, sdi);
1109                         else
1110                                 decode_chunk_ts(buf + (i * CHUNK_SIZE),
1111                                                 &devc->state.lastts,
1112                                                 &devc->state.lastsample,
1113                                                 -1, limit_chunk, sdi);
1114
1115                         ++devc->state.chunks_downloaded;
1116                 }
1117         }
1118
1119         return TRUE;
1120 }
1121
1122 /* Build a LUT entry used by the trigger functions. */
1123 static void build_lut_entry(uint16_t value, uint16_t mask, uint16_t *entry)
1124 {
1125         int i, j, k, bit;
1126
1127         /* For each quad probe. */
1128         for (i = 0; i < 4; ++i) {
1129                 entry[i] = 0xffff;
1130
1131                 /* For each bit in LUT. */
1132                 for (j = 0; j < 16; ++j)
1133
1134                         /* For each probe in quad. */
1135                         for (k = 0; k < 4; ++k) {
1136                                 bit = 1 << (i * 4 + k);
1137
1138                                 /* Set bit in entry */
1139                                 if ((mask & bit) &&
1140                                     ((!(value & bit)) !=
1141                                     (!(j & (1 << k)))))
1142                                         entry[i] &= ~(1 << j);
1143                         }
1144         }
1145 }
1146
1147 /* Add a logical function to LUT mask. */
1148 static void add_trigger_function(enum triggerop oper, enum triggerfunc func,
1149                                  int index, int neg, uint16_t *mask)
1150 {
1151         int i, j;
1152         int x[2][2], tmp, a, b, aset, bset, rset;
1153
1154         memset(x, 0, 4 * sizeof(int));
1155
1156         /* Trigger detect condition. */
1157         switch (oper) {
1158         case OP_LEVEL:
1159                 x[0][1] = 1;
1160                 x[1][1] = 1;
1161                 break;
1162         case OP_NOT:
1163                 x[0][0] = 1;
1164                 x[1][0] = 1;
1165                 break;
1166         case OP_RISE:
1167                 x[0][1] = 1;
1168                 break;
1169         case OP_FALL:
1170                 x[1][0] = 1;
1171                 break;
1172         case OP_RISEFALL:
1173                 x[0][1] = 1;
1174                 x[1][0] = 1;
1175                 break;
1176         case OP_NOTRISE:
1177                 x[1][1] = 1;
1178                 x[0][0] = 1;
1179                 x[1][0] = 1;
1180                 break;
1181         case OP_NOTFALL:
1182                 x[1][1] = 1;
1183                 x[0][0] = 1;
1184                 x[0][1] = 1;
1185                 break;
1186         case OP_NOTRISEFALL:
1187                 x[1][1] = 1;
1188                 x[0][0] = 1;
1189                 break;
1190         }
1191
1192         /* Transpose if neg is set. */
1193         if (neg) {
1194                 for (i = 0; i < 2; ++i) {
1195                         for (j = 0; j < 2; ++j) {
1196                                 tmp = x[i][j];
1197                                 x[i][j] = x[1-i][1-j];
1198                                 x[1-i][1-j] = tmp;
1199                         }
1200                 }
1201         }
1202
1203         /* Update mask with function. */
1204         for (i = 0; i < 16; ++i) {
1205                 a = (i >> (2 * index + 0)) & 1;
1206                 b = (i >> (2 * index + 1)) & 1;
1207
1208                 aset = (*mask >> i) & 1;
1209                 bset = x[b][a];
1210
1211                 if (func == FUNC_AND || func == FUNC_NAND)
1212                         rset = aset & bset;
1213                 else if (func == FUNC_OR || func == FUNC_NOR)
1214                         rset = aset | bset;
1215                 else if (func == FUNC_XOR || func == FUNC_NXOR)
1216                         rset = aset ^ bset;
1217
1218                 if (func == FUNC_NAND || func == FUNC_NOR || func == FUNC_NXOR)
1219                         rset = !rset;
1220
1221                 *mask &= ~(1 << i);
1222
1223                 if (rset)
1224                         *mask |= 1 << i;
1225         }
1226 }
1227
1228 /*
1229  * Build trigger LUTs used by 50 MHz and lower sample rates for supporting
1230  * simple pin change and state triggers. Only two transitions (rise/fall) can be
1231  * set at any time, but a full mask and value can be set (0/1).
1232  */
1233 static int build_basic_trigger(struct triggerlut *lut, struct dev_context *devc)
1234 {
1235         int i,j;
1236         uint16_t masks[2] = { 0, 0 };
1237
1238         memset(lut, 0, sizeof(struct triggerlut));
1239
1240         /* Contant for simple triggers. */
1241         lut->m4 = 0xa000;
1242
1243         /* Value/mask trigger support. */
1244         build_lut_entry(devc->trigger.simplevalue, devc->trigger.simplemask,
1245                         lut->m2d);
1246
1247         /* Rise/fall trigger support. */
1248         for (i = 0, j = 0; i < 16; ++i) {
1249                 if (devc->trigger.risingmask & (1 << i) ||
1250                     devc->trigger.fallingmask & (1 << i))
1251                         masks[j++] = 1 << i;
1252         }
1253
1254         build_lut_entry(masks[0], masks[0], lut->m0d);
1255         build_lut_entry(masks[1], masks[1], lut->m1d);
1256
1257         /* Add glue logic */
1258         if (masks[0] || masks[1]) {
1259                 /* Transition trigger. */
1260                 if (masks[0] & devc->trigger.risingmask)
1261                         add_trigger_function(OP_RISE, FUNC_OR, 0, 0, &lut->m3);
1262                 if (masks[0] & devc->trigger.fallingmask)
1263                         add_trigger_function(OP_FALL, FUNC_OR, 0, 0, &lut->m3);
1264                 if (masks[1] & devc->trigger.risingmask)
1265                         add_trigger_function(OP_RISE, FUNC_OR, 1, 0, &lut->m3);
1266                 if (masks[1] & devc->trigger.fallingmask)
1267                         add_trigger_function(OP_FALL, FUNC_OR, 1, 0, &lut->m3);
1268         } else {
1269                 /* Only value/mask trigger. */
1270                 lut->m3 = 0xffff;
1271         }
1272
1273         /* Triggertype: event. */
1274         lut->params.selres = 3;
1275
1276         return SR_OK;
1277 }
1278
1279 static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
1280                 void *cb_data)
1281 {
1282         struct dev_context *devc;
1283         struct sr_datafeed_packet *packet;
1284         struct sr_datafeed_header *header;
1285         struct clockselect_50 clockselect;
1286         int frac, triggerpin, ret;
1287         uint8_t triggerselect = 0;
1288         struct triggerinout triggerinout_conf;
1289         struct triggerlut lut;
1290
1291         devc = sdi->priv;
1292
1293         if (configure_probes(sdi) != SR_OK) {
1294                 sr_err("Failed to configure probes.");
1295                 return SR_ERR;
1296         }
1297
1298         /* If the samplerate has not been set, default to 200 kHz. */
1299         if (devc->cur_firmware == -1) {
1300                 if ((ret = set_samplerate(sdi, SR_KHZ(200))) != SR_OK)
1301                         return ret;
1302         }
1303
1304         /* Enter trigger programming mode. */
1305         sigma_set_register(WRITE_TRIGGER_SELECT1, 0x20, devc);
1306
1307         /* 100 and 200 MHz mode. */
1308         if (devc->cur_samplerate >= SR_MHZ(100)) {
1309                 sigma_set_register(WRITE_TRIGGER_SELECT1, 0x81, devc);
1310
1311                 /* Find which pin to trigger on from mask. */
1312                 for (triggerpin = 0; triggerpin < 8; ++triggerpin)
1313                         if ((devc->trigger.risingmask | devc->trigger.fallingmask) &
1314                             (1 << triggerpin))
1315                                 break;
1316
1317                 /* Set trigger pin and light LED on trigger. */
1318                 triggerselect = (1 << LEDSEL1) | (triggerpin & 0x7);
1319
1320                 /* Default rising edge. */
1321                 if (devc->trigger.fallingmask)
1322                         triggerselect |= 1 << 3;
1323
1324         /* All other modes. */
1325         } else if (devc->cur_samplerate <= SR_MHZ(50)) {
1326                 build_basic_trigger(&lut, devc);
1327
1328                 sigma_write_trigger_lut(&lut, devc);
1329
1330                 triggerselect = (1 << LEDSEL1) | (1 << LEDSEL0);
1331         }
1332
1333         /* Setup trigger in and out pins to default values. */
1334         memset(&triggerinout_conf, 0, sizeof(struct triggerinout));
1335         triggerinout_conf.trgout_bytrigger = 1;
1336         triggerinout_conf.trgout_enable = 1;
1337
1338         sigma_write_register(WRITE_TRIGGER_OPTION,
1339                              (uint8_t *) &triggerinout_conf,
1340                              sizeof(struct triggerinout), devc);
1341
1342         /* Go back to normal mode. */
1343         sigma_set_register(WRITE_TRIGGER_SELECT1, triggerselect, devc);
1344
1345         /* Set clock select register. */
1346         if (devc->cur_samplerate == SR_MHZ(200))
1347                 /* Enable 4 probes. */
1348                 sigma_set_register(WRITE_CLOCK_SELECT, 0xf0, devc);
1349         else if (devc->cur_samplerate == SR_MHZ(100))
1350                 /* Enable 8 probes. */
1351                 sigma_set_register(WRITE_CLOCK_SELECT, 0x00, devc);
1352         else {
1353                 /*
1354                  * 50 MHz mode (or fraction thereof). Any fraction down to
1355                  * 50 MHz / 256 can be used, but is not supported by sigrok API.
1356                  */
1357                 frac = SR_MHZ(50) / devc->cur_samplerate - 1;
1358
1359                 clockselect.async = 0;
1360                 clockselect.fraction = frac;
1361                 clockselect.disabled_probes = 0;
1362
1363                 sigma_write_register(WRITE_CLOCK_SELECT,
1364                                      (uint8_t *) &clockselect,
1365                                      sizeof(clockselect), devc);
1366         }
1367
1368         /* Setup maximum post trigger time. */
1369         sigma_set_register(WRITE_POST_TRIGGER,
1370                            (devc->capture_ratio * 255) / 100, devc);
1371
1372         /* Start acqusition. */
1373         gettimeofday(&devc->start_tv, 0);
1374         sigma_set_register(WRITE_MODE, 0x0d, devc);
1375
1376         devc->session_dev_id = cb_data;
1377
1378         if (!(packet = g_try_malloc(sizeof(struct sr_datafeed_packet)))) {
1379                 sr_err("%s: packet malloc failed.", __func__);
1380                 return SR_ERR_MALLOC;
1381         }
1382
1383         if (!(header = g_try_malloc(sizeof(struct sr_datafeed_header)))) {
1384                 sr_err("%s: header malloc failed.", __func__);
1385                 return SR_ERR_MALLOC;
1386         }
1387
1388         /* Send header packet to the session bus. */
1389         packet->type = SR_DF_HEADER;
1390         packet->payload = header;
1391         header->feed_version = 1;
1392         gettimeofday(&header->starttime, NULL);
1393         sr_session_send(devc->session_dev_id, packet);
1394
1395         /* Add capture source. */
1396         sr_source_add(0, G_IO_IN, 10, receive_data, (void *)sdi);
1397
1398         g_free(header);
1399         g_free(packet);
1400
1401         devc->state.state = SIGMA_CAPTURE;
1402
1403         return SR_OK;
1404 }
1405
1406 static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
1407 {
1408         struct dev_context *devc;
1409         uint8_t modestatus;
1410
1411         (void)cb_data;
1412
1413         sr_source_remove(0);
1414
1415         if (!(devc = sdi->priv)) {
1416                 sr_err("%s: sdi->priv was NULL", __func__);
1417                 return SR_ERR_BUG;
1418         }
1419
1420         /* Stop acquisition. */
1421         sigma_set_register(WRITE_MODE, 0x11, devc);
1422
1423         /* Set SDRAM Read Enable. */
1424         sigma_set_register(WRITE_MODE, 0x02, devc);
1425
1426         /* Get the current position. */
1427         sigma_read_pos(&devc->state.stoppos, &devc->state.triggerpos, devc);
1428
1429         /* Check if trigger has fired. */
1430         modestatus = sigma_get_register(READ_MODE, devc);
1431         if (modestatus & 0x20)
1432                 devc->state.triggerchunk = devc->state.triggerpos / 512;
1433         else
1434                 devc->state.triggerchunk = -1;
1435
1436         devc->state.chunks_downloaded = 0;
1437
1438         devc->state.state = SIGMA_DOWNLOAD;
1439
1440         return SR_OK;
1441 }
1442
1443 SR_PRIV struct sr_dev_driver asix_sigma_driver_info = {
1444         .name = "asix-sigma",
1445         .longname = "ASIX SIGMA/SIGMA2",
1446         .api_version = 1,
1447         .init = hw_init,
1448         .cleanup = hw_cleanup,
1449         .scan = hw_scan,
1450         .dev_list = hw_dev_list,
1451         .dev_clear = clear_instances,
1452         .config_get = config_get,
1453         .config_set = config_set,
1454         .config_list = config_list,
1455         .dev_open = hw_dev_open,
1456         .dev_close = hw_dev_close,
1457         .dev_acquisition_start = hw_dev_acquisition_start,
1458         .dev_acquisition_stop = hw_dev_acquisition_stop,
1459         .priv = NULL,
1460 };