X-Git-Url: https://sigrok.org/gitweb/?p=libsigrok.git;a=blobdiff_plain;f=src%2Fhardware%2Fopenbench-logic-sniffer%2Fprotocol.c;h=949b2c0454e1b0fce154c53df624acaaad810374;hp=9037d19fd8e3a272631f2b9c93fcd493aa051c25;hb=f8fd84208d5cb2788ef0288ddb87da3581467a96;hpb=4f840ce965b1c30c5ab75afecc56193cbaf5c1b3
diff --git a/src/hardware/openbench-logic-sniffer/protocol.c b/src/hardware/openbench-logic-sniffer/protocol.c
index 9037d19f..949b2c04 100644
--- a/src/hardware/openbench-logic-sniffer/protocol.c
+++ b/src/hardware/openbench-logic-sniffer/protocol.c
@@ -17,10 +17,15 @@
* along with this program. If not, see .
*/
+#include
#include "protocol.h"
-#include
-extern SR_PRIV struct sr_dev_driver ols_driver_info;
+
+struct ols_basic_trigger_desc {
+ uint32_t trigger_mask[NUM_BASIC_TRIGGER_STAGES];
+ uint32_t trigger_value[NUM_BASIC_TRIGGER_STAGES];
+ int num_stages;
+};
SR_PRIV int send_shortcommand(struct sr_serial_dev_inst *serial,
uint8_t command)
@@ -32,7 +37,7 @@ SR_PRIV int send_shortcommand(struct sr_serial_dev_inst *serial,
if (serial_write_blocking(serial, buf, 1, serial_timeout(serial, 1)) != 1)
return SR_ERR;
- if (serial_drain(serial) != 0)
+ if (serial_drain(serial) != SR_OK)
return SR_ERR;
return SR_OK;
@@ -53,53 +58,58 @@ SR_PRIV int send_longcommand(struct sr_serial_dev_inst *serial,
if (serial_write_blocking(serial, buf, 5, serial_timeout(serial, 1)) != 5)
return SR_ERR;
- if (serial_drain(serial) != 0)
+ if (serial_drain(serial) != SR_OK)
return SR_ERR;
return SR_OK;
}
-/* Configures the channel mask based on which channels are enabled. */
-SR_PRIV void ols_channel_mask(const struct sr_dev_inst *sdi)
+SR_PRIV int ols_send_reset(struct sr_serial_dev_inst *serial)
{
- struct dev_context *devc;
- struct sr_channel *channel;
- const GSList *l;
+ unsigned int i;
- devc = sdi->priv;
+ for (i = 0; i < 5; i++) {
+ if (send_shortcommand(serial, CMD_RESET) != SR_OK)
+ return SR_ERR;
+ }
- devc->channel_mask = 0;
- for (l = sdi->channels; l; l = l->next) {
- channel = l->data;
+ return SR_OK;
+}
+
+/* Configures the channel mask based on which channels are enabled. */
+SR_PRIV uint32_t ols_channel_mask(const struct sr_dev_inst *sdi)
+{
+ uint32_t channel_mask = 0;
+ for (const GSList *l = sdi->channels; l; l = l->next) {
+ struct sr_channel *channel = l->data;
if (channel->enabled)
- devc->channel_mask |= 1 << channel->index;
+ channel_mask |= 1 << channel->index;
}
+
+ return channel_mask;
}
-SR_PRIV int ols_convert_trigger(const struct sr_dev_inst *sdi)
+static int convert_trigger(const struct sr_dev_inst *sdi, struct ols_basic_trigger_desc *ols_trigger)
{
- struct dev_context *devc;
struct sr_trigger *trigger;
struct sr_trigger_stage *stage;
struct sr_trigger_match *match;
const GSList *l, *m;
int i;
- devc = sdi->priv;
-
- devc->num_stages = 0;
- for (i = 0; i < NUM_TRIGGER_STAGES; i++) {
- devc->trigger_mask[i] = 0;
- devc->trigger_value[i] = 0;
+ ols_trigger->num_stages = 0;
+ for (i = 0; i < NUM_BASIC_TRIGGER_STAGES; i++) {
+ ols_trigger->trigger_mask[i] = 0;
+ ols_trigger->trigger_value[i] = 0;
}
if (!(trigger = sr_session_trigger_get(sdi->session)))
return SR_OK;
- devc->num_stages = g_slist_length(trigger->stages);
- if (devc->num_stages > NUM_TRIGGER_STAGES) {
+ ols_trigger->num_stages = g_slist_length(trigger->stages);
+ if (ols_trigger->num_stages > NUM_BASIC_TRIGGER_STAGES) {
sr_err("This device only supports %d trigger stages.",
- NUM_TRIGGER_STAGES);
+ NUM_BASIC_TRIGGER_STAGES);
return SR_ERR;
}
@@ -110,9 +120,9 @@ SR_PRIV int ols_convert_trigger(const struct sr_dev_inst *sdi)
if (!match->channel->enabled)
/* Ignore disabled channels with a trigger. */
continue;
- devc->trigger_mask[stage->stage] |= 1 << match->channel->index;
+ ols_trigger->trigger_mask[stage->stage] |= 1 << match->channel->index;
if (match->match == SR_TRIGGER_ONE)
- devc->trigger_value[stage->stage] |= 1 << match->channel->index;
+ ols_trigger->trigger_value[stage->stage] |= 1 << match->channel->index;
}
}
@@ -124,32 +134,60 @@ SR_PRIV struct dev_context *ols_dev_new(void)
struct dev_context *devc;
devc = g_malloc0(sizeof(struct dev_context));
+ devc->trigger_at_smpl = OLS_NO_TRIGGER;
+
+ return devc;
+}
+
+static void ols_channel_new(struct sr_dev_inst *sdi, int num_chan)
+{
+ struct dev_context *devc = sdi->priv;
+ int i;
- /* Device-specific settings */
- devc->max_samples = devc->max_samplerate = devc->protocol_version = 0;
+ for (i = 0; i < num_chan; i++)
+ sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE,
+ ols_channel_names[i]);
- /* Acquisition settings */
- devc->limit_samples = devc->capture_ratio = 0;
- devc->trigger_at = -1;
- devc->channel_mask = 0xffffffff;
- devc->flag_reg = 0;
+ devc->max_channels = num_chan;
+}
- return devc;
+static void ols_metadata_quirks(struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ gboolean is_shrimp;
+
+ if (!sdi)
+ return;
+ devc = sdi->priv;
+ if (!devc)
+ return;
+
+ is_shrimp = sdi->model && strcmp(sdi->model, "Shrimp1.0") == 0;
+ if (is_shrimp) {
+ if (!devc->max_channels)
+ ols_channel_new(sdi, 4);
+ if (!devc->max_samples)
+ devc->max_samples = 256 * 1024;
+ if (!devc->max_samplerate)
+ devc->max_samplerate = SR_MHZ(20);
+ }
+
+ if (sdi->version && strstr(sdi->version, "FPGA version 3.07"))
+ devc->device_flags |= DEVICE_FLAG_IS_DEMON_CORE;
}
SR_PRIV struct sr_dev_inst *get_metadata(struct sr_serial_dev_inst *serial)
{
struct sr_dev_inst *sdi;
struct dev_context *devc;
- uint32_t tmp_int, ui;
- uint8_t key, type, token;
+ uint32_t tmp_int;
+ uint8_t key, type;
int delay_ms;
GString *tmp_str, *devname, *version;
guchar tmp_c;
sdi = g_malloc0(sizeof(struct sr_dev_inst));
sdi->status = SR_ST_INACTIVE;
- sdi->driver = &ols_driver_info;
devc = ols_dev_new();
sdi->priv = devc;
@@ -161,12 +199,11 @@ SR_PRIV struct sr_dev_inst *get_metadata(struct sr_serial_dev_inst *serial)
delay_ms = serial_timeout(serial, 1);
if (serial_read_blocking(serial, &key, 1, delay_ms) != 1)
break;
- if (key == 0x00) {
+ if (key == METADATA_TOKEN_END) {
sr_dbg("Got metadata key 0x00, metadata ends.");
break;
}
type = key >> 5;
- token = key & 0x1f;
switch (type) {
case 0:
/* NULL-terminated string */
@@ -174,21 +211,20 @@ SR_PRIV struct sr_dev_inst *get_metadata(struct sr_serial_dev_inst *serial)
delay_ms = serial_timeout(serial, 1);
while (serial_read_blocking(serial, &tmp_c, 1, delay_ms) == 1 && tmp_c != '\0')
g_string_append_c(tmp_str, tmp_c);
- sr_dbg("Got metadata key 0x%.2x value '%s'.",
- key, tmp_str->str);
- switch (token) {
- case 0x01:
+ sr_dbg("Got metadata token 0x%.2x value '%s'.", key, tmp_str->str);
+ switch (key) {
+ case METADATA_TOKEN_DEVICE_NAME:
/* Device name */
devname = g_string_append(devname, tmp_str->str);
break;
- case 0x02:
+ case METADATA_TOKEN_FPGA_VERSION:
/* FPGA firmware version */
if (version->len)
g_string_append(version, ", ");
g_string_append(version, "FPGA version ");
g_string_append(version, tmp_str->str);
break;
- case 0x03:
+ case METADATA_TOKEN_ANCILLARY_VERSION:
/* Ancillary version */
if (version->len)
g_string_append(version, ", ");
@@ -196,8 +232,7 @@ SR_PRIV struct sr_dev_inst *get_metadata(struct sr_serial_dev_inst *serial)
g_string_append(version, tmp_str->str);
break;
default:
- sr_info("ols: unknown token 0x%.2x: '%s'",
- token, tmp_str->str);
+ sr_info("ols: unknown token 0x%.2x: '%s'", key, tmp_str->str);
break;
}
g_string_free(tmp_str, TRUE);
@@ -208,34 +243,30 @@ SR_PRIV struct sr_dev_inst *get_metadata(struct sr_serial_dev_inst *serial)
if (serial_read_blocking(serial, &tmp_int, 4, delay_ms) != 4)
break;
tmp_int = RB32(&tmp_int);
- sr_dbg("Got metadata key 0x%.2x value 0x%.8x.",
- key, tmp_int);
- switch (token) {
- case 0x00:
+ sr_dbg("Got metadata token 0x%.2x value 0x%.8x.", key, tmp_int);
+ switch (key) {
+ case METADATA_TOKEN_NUM_PROBES_LONG:
/* Number of usable channels */
- for (ui = 0; ui < tmp_int; ui++)
- sr_channel_new(sdi, ui, SR_CHANNEL_LOGIC, TRUE,
- ols_channel_names[ui]);
+ ols_channel_new(sdi, tmp_int);
break;
- case 0x01:
+ case METADATA_TOKEN_SAMPLE_MEMORY_BYTES:
/* Amount of sample memory available (bytes) */
devc->max_samples = tmp_int;
break;
- case 0x02:
+ case METADATA_TOKEN_DYNAMIC_MEMORY_BYTES:
/* Amount of dynamic memory available (bytes) */
/* what is this for? */
break;
- case 0x03:
- /* Maximum sample rate (hz) */
+ case METADATA_TOKEN_MAX_SAMPLE_RATE_HZ:
+ /* Maximum sample rate (Hz) */
devc->max_samplerate = tmp_int;
break;
- case 0x04:
+ case METADATA_TOKEN_PROTOCOL_VERSION_LONG:
/* protocol version */
devc->protocol_version = tmp_int;
break;
default:
- sr_info("Unknown token 0x%.2x: 0x%.8x.",
- token, tmp_int);
+ sr_info("Unknown token 0x%.2x: 0x%.8x.", key, tmp_int);
break;
}
break;
@@ -244,22 +275,18 @@ SR_PRIV struct sr_dev_inst *get_metadata(struct sr_serial_dev_inst *serial)
delay_ms = serial_timeout(serial, 1);
if (serial_read_blocking(serial, &tmp_c, 1, delay_ms) != 1)
break;
- sr_dbg("Got metadata key 0x%.2x value 0x%.2x.",
- key, tmp_c);
- switch (token) {
- case 0x00:
+ sr_dbg("Got metadata token 0x%.2x value 0x%.2x.", key, tmp_c);
+ switch (key) {
+ case METADATA_TOKEN_NUM_PROBES_SHORT:
/* Number of usable channels */
- for (ui = 0; ui < tmp_c; ui++)
- sr_channel_new(sdi, ui, SR_CHANNEL_LOGIC, TRUE,
- ols_channel_names[ui]);
+ ols_channel_new(sdi, tmp_c);
break;
- case 0x01:
+ case METADATA_TOKEN_PROTOCOL_VERSION_SHORT:
/* protocol version */
devc->protocol_version = tmp_c;
break;
default:
- sr_info("Unknown token 0x%.2x: 0x%.2x.",
- token, tmp_c);
+ sr_info("Unknown token 0x%.2x: 0x%.2x.", key, tmp_c);
break;
}
break;
@@ -274,6 +301,9 @@ SR_PRIV struct sr_dev_inst *get_metadata(struct sr_serial_dev_inst *serial)
g_string_free(devname, FALSE);
g_string_free(version, FALSE);
+ /* Optionally amend received metadata, model specific quirks. */
+ ols_metadata_quirks(sdi);
+
return sdi;
}
@@ -288,15 +318,13 @@ SR_PRIV int ols_set_samplerate(const struct sr_dev_inst *sdi,
if (samplerate > CLOCK_RATE) {
sr_info("Enabling demux mode.");
- devc->flag_reg |= FLAG_DEMUX;
- devc->flag_reg &= ~FLAG_FILTER;
- devc->max_channels = NUM_CHANNELS / 2;
+ devc->capture_flags |= CAPTURE_FLAG_DEMUX;
+ devc->capture_flags &= ~CAPTURE_FLAG_NOISE_FILTER;
devc->cur_samplerate_divider = (CLOCK_RATE * 2 / samplerate) - 1;
} else {
sr_info("Disabling demux mode.");
- devc->flag_reg &= ~FLAG_DEMUX;
- devc->flag_reg |= FLAG_FILTER;
- devc->max_channels = NUM_CHANNELS;
+ devc->capture_flags &= ~CAPTURE_FLAG_DEMUX;
+ devc->capture_flags |= CAPTURE_FLAG_NOISE_FILTER;
devc->cur_samplerate_divider = (CLOCK_RATE / samplerate) - 1;
}
@@ -304,7 +332,7 @@ SR_PRIV int ols_set_samplerate(const struct sr_dev_inst *sdi,
* from the requested.
*/
devc->cur_samplerate = CLOCK_RATE / (devc->cur_samplerate_divider + 1);
- if (devc->flag_reg & FLAG_DEMUX)
+ if (devc->capture_flags & CAPTURE_FLAG_DEMUX)
devc->cur_samplerate *= 2;
if (devc->cur_samplerate != samplerate)
sr_info("Can't match samplerate %" PRIu64 ", using %"
@@ -315,15 +343,14 @@ SR_PRIV int ols_set_samplerate(const struct sr_dev_inst *sdi,
SR_PRIV void abort_acquisition(const struct sr_dev_inst *sdi)
{
- struct sr_datafeed_packet packet;
struct sr_serial_dev_inst *serial;
serial = sdi->conn;
+ ols_send_reset(serial);
+
serial_source_remove(sdi->session, serial);
- /* Terminate session */
- packet.type = SR_DF_END;
- sr_session_send(sdi, &packet);
+ std_session_send_df_end(sdi);
}
SR_PRIV int ols_receive_data(int fd, int revents, void *cb_data)
@@ -334,7 +361,7 @@ SR_PRIV int ols_receive_data(int fd, int revents, void *cb_data)
struct sr_datafeed_packet packet;
struct sr_datafeed_logic logic;
uint32_t sample;
- int num_ols_changrp, offset, j;
+ int num_changroups, offset, j;
unsigned int i;
unsigned char byte;
@@ -344,16 +371,12 @@ SR_PRIV int ols_receive_data(int fd, int revents, void *cb_data)
serial = sdi->conn;
devc = sdi->priv;
+ if (devc->num_transfers == 0 && revents == 0) {
+ /* Ignore timeouts as long as we haven't received anything */
+ return TRUE;
+ }
+
if (devc->num_transfers++ == 0) {
- /*
- * First time round, means the device started sending data,
- * and will not stop until done. If it stops sending for
- * longer than it takes to send a byte, that means it's
- * finished. We'll double that to 30ms to be sure...
- */
- serial_source_remove(sdi->session, serial);
- serial_source_add(sdi->session, serial, G_IO_IN, 30,
- ols_receive_data, cb_data);
devc->raw_sample_buf = g_try_malloc(devc->limit_samples * 4);
if (!devc->raw_sample_buf) {
sr_err("Sample buffer malloc failed.");
@@ -363,10 +386,10 @@ SR_PRIV int ols_receive_data(int fd, int revents, void *cb_data)
memset(devc->raw_sample_buf, 0x82, devc->limit_samples * 4);
}
- num_ols_changrp = 0;
- for (i = NUM_CHANNELS; i > 0x02; i /= 2) {
- if ((devc->flag_reg & i) == 0) {
- num_ols_changrp++;
+ num_changroups = 0;
+ for (i = 0x20; i > 0x02; i >>= 1) {
+ if ((devc->capture_flags & i) == 0) {
+ num_changroups++;
}
}
@@ -381,7 +404,7 @@ SR_PRIV int ols_receive_data(int fd, int revents, void *cb_data)
devc->sample[devc->num_bytes++] = byte;
sr_spew("Received byte 0x%.2x.", byte);
- if (devc->num_bytes == num_ols_changrp) {
+ if (devc->num_bytes == num_changroups) {
devc->cnt_samples++;
devc->cnt_samples_rle++;
/*
@@ -391,7 +414,7 @@ SR_PRIV int ols_receive_data(int fd, int revents, void *cb_data)
sample = devc->sample[0] | (devc->sample[1] << 8) \
| (devc->sample[2] << 16) | (devc->sample[3] << 24);
sr_dbg("Received sample 0x%.*x.", devc->num_bytes * 2, sample);
- if (devc->flag_reg & FLAG_RLE) {
+ if (devc->capture_flags & CAPTURE_FLAG_RLE) {
/*
* In RLE mode the high bit of the sample is the
* "count" flag, meaning this sample is the number
@@ -414,7 +437,7 @@ SR_PRIV int ols_receive_data(int fd, int revents, void *cb_data)
devc->num_samples = devc->limit_samples;
}
- if (num_ols_changrp < 4) {
+ if (num_changroups < 4) {
/*
* Some channel groups may have been turned
* off, to speed up transfer between the
@@ -427,20 +450,21 @@ SR_PRIV int ols_receive_data(int fd, int revents, void *cb_data)
j = 0;
memset(devc->tmp_sample, 0, 4);
for (i = 0; i < 4; i++) {
- if (((devc->flag_reg >> 2) & (1 << i)) == 0) {
+ if (((devc->capture_flags >> 2) & (1 << i)) == 0) {
/*
* This channel group was
* enabled, copy from received
* sample.
*/
devc->tmp_sample[i] = devc->sample[j++];
- } else if (devc->flag_reg & FLAG_DEMUX && (i > 2)) {
+ } else if (devc->capture_flags & CAPTURE_FLAG_DEMUX && (i > 2)) {
/* group 2 & 3 get added to 0 & 1 */
devc->tmp_sample[i - 2] = devc->sample[j++];
}
}
memcpy(devc->sample, devc->tmp_sample, 4);
- sr_spew("Expanded sample: 0x%.8x.", sample);
+ sr_spew("Expanded sample: 0x%.2hhx%.2hhx%.2hhx%.2hhx ",
+ devc->sample[3], devc->sample[2], devc->sample[1], devc->sample[0]);
}
/*
@@ -466,44 +490,37 @@ SR_PRIV int ols_receive_data(int fd, int revents, void *cb_data)
sr_dbg("Received %d bytes, %d samples, %d decompressed samples.",
devc->cnt_bytes, devc->cnt_samples,
devc->cnt_samples_rle);
- if (devc->trigger_at != -1) {
+ if (devc->trigger_at_smpl != OLS_NO_TRIGGER) {
/*
* A trigger was set up, so we need to tell the frontend
* about it.
*/
- if (devc->trigger_at > 0) {
+ if (devc->trigger_at_smpl > 0) {
/* There are pre-trigger samples, send those first. */
packet.type = SR_DF_LOGIC;
packet.payload = &logic;
- logic.length = devc->trigger_at * 4;
+ logic.length = devc->trigger_at_smpl * 4;
logic.unitsize = 4;
logic.data = devc->raw_sample_buf +
(devc->limit_samples - devc->num_samples) * 4;
- sr_session_send(cb_data, &packet);
+ sr_session_send(sdi, &packet);
}
/* Send the trigger. */
- packet.type = SR_DF_TRIGGER;
- sr_session_send(cb_data, &packet);
-
- /* Send post-trigger samples. */
- packet.type = SR_DF_LOGIC;
- packet.payload = &logic;
- logic.length = (devc->num_samples * 4) - (devc->trigger_at * 4);
- logic.unitsize = 4;
- logic.data = devc->raw_sample_buf + devc->trigger_at * 4 +
- (devc->limit_samples - devc->num_samples) * 4;
- sr_session_send(cb_data, &packet);
- } else {
- /* no trigger was used */
- packet.type = SR_DF_LOGIC;
- packet.payload = &logic;
- logic.length = devc->num_samples * 4;
- logic.unitsize = 4;
- logic.data = devc->raw_sample_buf +
- (devc->limit_samples - devc->num_samples) * 4;
- sr_session_send(cb_data, &packet);
+ std_session_send_df_trigger(sdi);
}
+
+ /* Send post-trigger / all captured samples. */
+ int num_pre_trigger_samples = devc->trigger_at_smpl == OLS_NO_TRIGGER
+ ? 0 : devc->trigger_at_smpl;
+ packet.type = SR_DF_LOGIC;
+ packet.payload = &logic;
+ logic.length = (devc->num_samples - num_pre_trigger_samples) * 4;
+ logic.unitsize = 4;
+ logic.data = devc->raw_sample_buf + (num_pre_trigger_samples +
+ devc->limit_samples - devc->num_samples) * 4;
+ sr_session_send(sdi, &packet);
+
g_free(devc->raw_sample_buf);
serial_flush(serial);
@@ -512,3 +529,155 @@ SR_PRIV int ols_receive_data(int fd, int revents, void *cb_data)
return TRUE;
}
+
+static int ols_set_basic_trigger_stage(const struct ols_basic_trigger_desc *trigger_desc, struct sr_serial_dev_inst *serial, int stage)
+{
+ uint8_t cmd, arg[4];
+
+ cmd = CMD_SET_BASIC_TRIGGER_MASK0 + stage * 4;
+ arg[0] = trigger_desc->trigger_mask[stage] & 0xff;
+ arg[1] = (trigger_desc->trigger_mask[stage] >> 8) & 0xff;
+ arg[2] = (trigger_desc->trigger_mask[stage] >> 16) & 0xff;
+ arg[3] = (trigger_desc->trigger_mask[stage] >> 24) & 0xff;
+ if (send_longcommand(serial, cmd, arg) != SR_OK)
+ return SR_ERR;
+
+ cmd = CMD_SET_BASIC_TRIGGER_VALUE0 + stage * 4;
+ arg[0] = trigger_desc->trigger_value[stage] & 0xff;
+ arg[1] = (trigger_desc->trigger_value[stage] >> 8) & 0xff;
+ arg[2] = (trigger_desc->trigger_value[stage] >> 16) & 0xff;
+ arg[3] = (trigger_desc->trigger_value[stage] >> 24) & 0xff;
+ if (send_longcommand(serial, cmd, arg) != SR_OK)
+ return SR_ERR;
+
+ cmd = CMD_SET_BASIC_TRIGGER_CONFIG0 + stage * 4;
+ arg[0] = arg[1] = arg[3] = 0x00;
+ arg[2] = stage;
+ if (stage == trigger_desc->num_stages)
+ /* Last stage, fire when this one matches. */
+ arg[3] |= TRIGGER_START;
+ if (send_longcommand(serial, cmd, arg) != SR_OK)
+ return SR_ERR;
+
+ return SR_OK;
+}
+
+SR_PRIV int ols_prepare_acquisition(const struct sr_dev_inst *sdi) {
+ int ret;
+ uint8_t arg[4];
+
+ struct dev_context *devc = sdi->priv;
+ struct sr_serial_dev_inst *serial = sdi->conn;
+
+ int num_changroups = 0;
+ uint8_t changroup_mask = 0;
+ uint32_t channel_mask = ols_channel_mask(sdi);
+ for (unsigned int i = 0; i < 4; i++) {
+ if (channel_mask & (0xff << (i * 8))) {
+ changroup_mask |= (1 << i);
+ num_changroups++;
+ }
+ }
+
+ /*
+ * Limit readcount to prevent reading past the end of the hardware
+ * buffer. Rather read too many samples than too few.
+ */
+ uint32_t samplecount = MIN(devc->max_samples / num_changroups, devc->limit_samples);
+ uint32_t readcount = (samplecount + 3) / 4;
+ uint32_t delaycount;
+
+ /* Basic triggers. */
+ struct ols_basic_trigger_desc basic_trigger_desc;
+ if (convert_trigger(sdi, &basic_trigger_desc) != SR_OK) {
+ sr_err("Failed to configure channels.");
+ return SR_ERR;
+ }
+ if (basic_trigger_desc.num_stages > 0) {
+ /*
+ * According to http://mygizmos.org/ols/Logic-Sniffer-FPGA-Spec.pdf
+ * reset command must be send prior each arm command
+ */
+ sr_dbg("Send reset command before trigger configure");
+ if (ols_send_reset(serial) != SR_OK)
+ return SR_ERR;
+
+ delaycount = readcount * (1 - devc->capture_ratio / 100.0);
+ devc->trigger_at_smpl = (readcount - delaycount) * 4 - basic_trigger_desc.num_stages;
+ for (int i = 0; i <= basic_trigger_desc.num_stages; i++) {
+ sr_dbg("Setting OLS stage %d trigger.", i);
+ if ((ret = ols_set_basic_trigger_stage(&basic_trigger_desc, serial, i)) != SR_OK)
+ return ret;
+ }
+ } else {
+ /* No triggers configured, force trigger on first stage. */
+ sr_dbg("Forcing trigger at stage 0.");
+ if ((ret = ols_set_basic_trigger_stage(&basic_trigger_desc, serial, 0)) != SR_OK)
+ return ret;
+ delaycount = readcount;
+ }
+
+ /* Samplerate. */
+ sr_dbg("Setting samplerate to %" PRIu64 "Hz (divider %u)",
+ devc->cur_samplerate, devc->cur_samplerate_divider);
+ arg[0] = devc->cur_samplerate_divider & 0xff;
+ arg[1] = (devc->cur_samplerate_divider & 0xff00) >> 8;
+ arg[2] = (devc->cur_samplerate_divider & 0xff0000) >> 16;
+ arg[3] = 0x00;
+ if (send_longcommand(serial, CMD_SET_DIVIDER, arg) != SR_OK)
+ return SR_ERR;
+
+ /* Send sample limit and pre/post-trigger capture ratio. */
+ sr_dbg("Setting sample limit %d, trigger point at %d",
+ (readcount - 1) * 4, (delaycount - 1) * 4);
+
+ if (devc->max_samples > 256 * 1024) {
+ arg[0] = ((readcount - 1) & 0xff);
+ arg[1] = ((readcount - 1) & 0xff00) >> 8;
+ arg[2] = ((readcount - 1) & 0xff0000) >> 16;
+ arg[3] = ((readcount - 1) & 0xff000000) >> 24;
+ if (send_longcommand(serial, CMD_CAPTURE_READCOUNT, arg) != SR_OK)
+ return SR_ERR;
+ arg[0] = ((delaycount - 1) & 0xff);
+ arg[1] = ((delaycount - 1) & 0xff00) >> 8;
+ arg[2] = ((delaycount - 1) & 0xff0000) >> 16;
+ arg[3] = ((delaycount - 1) & 0xff000000) >> 24;
+ if (send_longcommand(serial, CMD_CAPTURE_DELAYCOUNT, arg) != SR_OK)
+ return SR_ERR;
+ } else {
+ arg[0] = ((readcount - 1) & 0xff);
+ arg[1] = ((readcount - 1) & 0xff00) >> 8;
+ arg[2] = ((delaycount - 1) & 0xff);
+ arg[3] = ((delaycount - 1) & 0xff00) >> 8;
+ if (send_longcommand(serial, CMD_CAPTURE_SIZE, arg) != SR_OK)
+ return SR_ERR;
+ }
+
+ /* Flag register. */
+ sr_dbg("Setting intpat %s, extpat %s, RLE %s, noise_filter %s, demux %s, %s clock%s",
+ devc->capture_flags & CAPTURE_FLAG_INTERNAL_TEST_MODE ? "on": "off",
+ devc->capture_flags & CAPTURE_FLAG_EXTERNAL_TEST_MODE ? "on": "off",
+ devc->capture_flags & CAPTURE_FLAG_RLE ? "on" : "off",
+ devc->capture_flags & CAPTURE_FLAG_NOISE_FILTER ? "on": "off",
+ devc->capture_flags & CAPTURE_FLAG_DEMUX ? "on" : "off",
+ devc->capture_flags & CAPTURE_FLAG_CLOCK_EXTERNAL ? "external" : "internal",
+ devc->capture_flags & CAPTURE_FLAG_CLOCK_EXTERNAL ? (devc->capture_flags & CAPTURE_FLAG_INVERT_EXT_CLOCK
+ ? " on falling edge" : "on rising edge") : "");
+
+ /*
+ * Enable/disable OLS channel groups in the flag register according
+ * to the channel mask. 1 means "disable channel".
+ */
+ devc->capture_flags &= ~0x3c;
+ devc->capture_flags |= ~(changroup_mask << 2) & 0x3c;
+
+ /* RLE mode is always zero, for now. */
+
+ arg[0] = devc->capture_flags & 0xff;
+ arg[1] = devc->capture_flags >> 8;
+ arg[2] = arg[3] = 0x00;
+ if (send_longcommand(serial, CMD_SET_FLAGS, arg) != SR_OK)
+ return SR_ERR;
+
+ return SR_OK;
+}