static int dev_acquisition_start(const struct sr_dev_inst *sdi,
void *cb_data)
{
struct dev_context *devc;
struct sr_usb_dev_inst *usb;
struct sr_datafeed_packet packet;
struct sr_datafeed_logic logic;
unsigned int samples_read;
int res;
unsigned int packet_num, n;
unsigned char *buf;
unsigned int status;
unsigned int stop_address;
unsigned int now_address;
unsigned int trigger_address;
unsigned int trigger_offset;
unsigned int triggerbar;
unsigned int ramsize_trigger;
unsigned int memory_size;
unsigned int valid_samples;
unsigned int discard;
int trigger_now;
if (sdi->status != SR_ST_ACTIVE)
return SR_ERR_DEV_CLOSED;
if (!(devc = sdi->priv)) {
sr_err("%s: sdi->priv was NULL", __func__);
return SR_ERR_ARG;
}
if (configure_channels(sdi) != SR_OK) {
sr_err("Failed to configure channels.");
return SR_ERR;
}
usb = sdi->conn;
set_triggerbar(devc);
/* Push configured settings to device. */
analyzer_configure(usb->devhdl);
analyzer_start(usb->devhdl);
sr_info("Waiting for data.");
analyzer_wait_data(usb->devhdl);
status = analyzer_read_status(usb->devhdl);
stop_address = analyzer_get_stop_address(usb->devhdl);
now_address = analyzer_get_now_address(usb->devhdl);
trigger_address = analyzer_get_trigger_address(usb->devhdl);
triggerbar = analyzer_get_triggerbar_address();
ramsize_trigger = analyzer_get_ramsize_trigger_address();
n = get_memory_size(devc->memory_size);
memory_size = n / 4;
sr_info("Status = 0x%x.", status);
sr_info("Stop address = 0x%x.", stop_address);
sr_info("Now address = 0x%x.", now_address);
sr_info("Trigger address = 0x%x.", trigger_address);
sr_info("Triggerbar address = 0x%x.", triggerbar);
sr_info("Ramsize trigger = 0x%x.", ramsize_trigger);
sr_info("Memory size = 0x%x.", memory_size);
/* Send header packet to the session bus. */
std_session_send_df_header(cb_data, LOG_PREFIX);
/* Check for empty capture */
if ((status & STATUS_READY) && !stop_address) {
packet.type = SR_DF_END;
sr_session_send(cb_data, &packet);
return SR_OK;
}
if (!(buf = g_try_malloc(PACKET_SIZE))) {
sr_err("Packet buffer malloc failed.");
return SR_ERR_MALLOC;
}
/* Check if the trigger is in the samples we are throwing away */
trigger_now = now_address == trigger_address ||
((now_address + 1) % memory_size) == trigger_address;
/*
* STATUS_READY doesn't clear until now_address advances past
* addr 0, but for our logic, clear it in that case
*/
if (!now_address)
status &= ~STATUS_READY;
analyzer_read_start(usb->devhdl);
/* Calculate how much data to discard */
discard = 0;
if (status & STATUS_READY) {
/*
* We haven't wrapped around, we need to throw away data from
* our current position to the end of the buffer.
* Additionally, the first two samples captured are always
* bogus.
*/
discard += memory_size - now_address + 2;
now_address = 2;
}
/* If we have more samples than we need, discard them */
valid_samples = (stop_address - now_address) % memory_size;
if (valid_samples > ramsize_trigger + triggerbar) {
discard += valid_samples - (ramsize_trigger + triggerbar);
now_address += valid_samples - (ramsize_trigger + triggerbar);
}
sr_info("Need to discard %d samples.", discard);
/* Calculate how far in the trigger is */
if (trigger_now)
trigger_offset = 0;
else
trigger_offset = (trigger_address - now_address) % memory_size;
/* Recalculate the number of samples available */
valid_samples = (stop_address - now_address) % memory_size;
/* Send the incoming transfer to the session bus. */
samples_read = 0;
for (packet_num = 0; packet_num < n / PACKET_SIZE; packet_num++) {
unsigned int len;
unsigned int buf_offset;
res = analyzer_read_data(usb->devhdl, buf, PACKET_SIZE);
sr_info("Tried to read %d bytes, actually read %d bytes.",
PACKET_SIZE, res);
if (discard >= PACKET_SIZE / 4) {
discard -= PACKET_SIZE / 4;
continue;
}
len = PACKET_SIZE - discard * 4;
buf_offset = discard * 4;
discard = 0;
/* Check if we've read all the samples */
if (samples_read + len / 4 >= valid_samples)
len = (valid_samples - samples_read) * 4;
if (!len)
break;
if (samples_read < trigger_offset &&
samples_read + len / 4 > trigger_offset) {
/* Send out samples remaining before trigger */
packet.type = SR_DF_LOGIC;
packet.payload = &logic;
logic.length = (trigger_offset - samples_read) * 4;
logic.unitsize = 4;
logic.data = buf + buf_offset;
sr_session_send(cb_data, &packet);
len -= logic.length;
samples_read += logic.length / 4;
buf_offset += logic.length;
}
if (samples_read == trigger_offset) {
/* Send out trigger */
packet.type = SR_DF_TRIGGER;
packet.payload = NULL;
sr_session_send(cb_data, &packet);
}
/* Send out data (or data after trigger) */
packet.type = SR_DF_LOGIC;
packet.payload = &logic;
logic.length = len;
logic.unitsize = 4;
logic.data = buf + buf_offset;
sr_session_send(cb_data, &packet);
samples_read += len / 4;
}
analyzer_read_stop(usb->devhdl);
g_free(buf);
packet.type = SR_DF_END;
sr_session_send(cb_data, &packet);
return SR_OK;
}
static int hw_dev_acquisition_start(int dev_index, void *cb_data)
{
struct sr_dev_inst *sdi;
struct sr_datafeed_packet packet;
struct sr_datafeed_logic logic;
struct sr_datafeed_header header;
uint64_t samples_read;
int res;
unsigned int packet_num;
unsigned char *buf;
struct context *ctx;
if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) {
sr_err("zp: %s: sdi was NULL", __func__);
return SR_ERR;
}
if (!(ctx = sdi->priv)) {
sr_err("zp: %s: sdi->priv was NULL", __func__);
return SR_ERR_ARG;
}
/* push configured settings to device */
analyzer_configure(ctx->usb->devhdl);
analyzer_start(ctx->usb->devhdl);
sr_info("zp: Waiting for data");
analyzer_wait_data(ctx->usb->devhdl);
sr_info("zp: Stop address = 0x%x",
analyzer_get_stop_address(ctx->usb->devhdl));
sr_info("zp: Now address = 0x%x",
analyzer_get_now_address(ctx->usb->devhdl));
sr_info("zp: Trigger address = 0x%x",
analyzer_get_trigger_address(ctx->usb->devhdl));
packet.type = SR_DF_HEADER;
packet.payload = &header;
header.feed_version = 1;
gettimeofday(&header.starttime, NULL);
header.samplerate = ctx->cur_samplerate;
header.num_logic_probes = ctx->num_channels;
sr_session_send(cb_data, &packet);
if (!(buf = g_try_malloc(PACKET_SIZE))) {
sr_err("zp: %s: buf malloc failed", __func__);
return SR_ERR_MALLOC;
}
samples_read = 0;
analyzer_read_start(ctx->usb->devhdl);
/* Send the incoming transfer to the session bus. */
for (packet_num = 0; packet_num < (ctx->memory_size * 4 / PACKET_SIZE);
packet_num++) {
res = analyzer_read_data(ctx->usb->devhdl, buf, PACKET_SIZE);
sr_info("zp: Tried to read %llx bytes, actually read %x bytes",
PACKET_SIZE, res);
packet.type = SR_DF_LOGIC;
packet.payload = &logic;
logic.length = PACKET_SIZE;
logic.unitsize = 4;
logic.data = buf;
sr_session_send(cb_data, &packet);
samples_read += res / 4;
}
analyzer_read_stop(ctx->usb->devhdl);
g_free(buf);
packet.type = SR_DF_END;
sr_session_send(cb_data, &packet);
return SR_OK;
}