/*
* This file is part of the libsigrok project.
*
- * Copyright (C) 2022
AC0BI <ac0bi00@gmail.com>
+ * Copyright (C) 2022
Shawn Walker <ac0bi00@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+#define _GNU_SOURCE
+
#include <config.h>
+#include <errno.h>
+#include <glib.h>
+#include <math.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <libsigrok/libsigrok.h>
+#include "libsigrok-internal.h"
#include "protocol.h"
-SR_PRIV int raspberrypi_pico_receive_data(int fd, int revents, void *cb_data)
+SR_PRIV int send_serial_str(struct sr_serial_dev_inst *serial, char *str)
{
- const struct sr_dev_inst *sdi;
- struct dev_context *devc;
+ int len = strlen(str);
+ if ((len > 15) || (len < 1)) { //limit length to catch errant strings
+ sr_err("ERROR:Serial string len %d invalid ", len);
+ return SR_ERR;
+ }
+ //100ms timeout. With USB CDC serial we can't define the timeout
+ //based on link rate, so just pick something large as we shouldn't normally see them
+ if (serial_write_blocking(serial, str, len, 100) != len) {
+ sr_err("ERROR:Serial str write failed");
+ return SR_ERR;
+ }
+
+ return SR_OK;
+}
+
+SR_PRIV int send_serial_char(struct sr_serial_dev_inst *serial, char ch)
+{
+ char buf[1];
+ buf[0] = ch;
+ if (serial_write_blocking(serial, buf, 1, 100) != 1) { //100ms
+ sr_err("ERROR:Serial char write failed");
+ return SR_ERR;
+ }
+ return SR_OK;
+}
+
+//Issue a command that expects a string return, return length of string
+int send_serial_w_resp(struct sr_serial_dev_inst *serial, char *str,
+ char *resp, size_t cnt)
+{
+ int num_read, i;
+ send_serial_str(serial, str);
+ //Using the serial_read_blocking function when reading a response of unknown length requires
+ //a long worst case timeout to always be taken. So, instead loop waiting for a first byte, and
+ //then a final small delay for the rest.
+ for (i = 0; i < 1000; i++) { //wait up to 1 second in ms increments
+ num_read = serial_read_blocking(serial, resp, cnt, 1);
+ if (num_read > 0)
+ break;
+ }
+ //sr_spew("rwprsp1 i %d nr %d",i,num_read);
+ //Since the serial port is usb CDC we can't calculate timeouts based on baud rate but
+ //even if the response is split between two USB transfers 10ms should be plenty.
+ num_read +=
+ serial_read_blocking(serial, &(resp[num_read]), cnt - num_read,
+ 10);
+ //sr_spew("rwrsp2 nr %d",num_read);
+
+ if ((num_read < 1) || (num_read > 30)) {
+ sr_err("ERROR:Serial_w_resp failed (%d).", num_read);
+ return -1;
+ } else {
+ return num_read;
+ }
+}
+
+//Issue a command that expects a single char ack
+SR_PRIV int send_serial_w_ack(struct sr_serial_dev_inst *serial, char *str)
+{
+ char buf[2];
+ int num_read;
+ //In case we have left over transfer from the device, drain them
+ while ((num_read = serial_read_blocking(serial, buf, 2, 10))) {
+ //sr_dbg("swack drops 2 previous bytes %d %d",buf[0],buf[1]);
+ }
+ send_serial_str(serial, str);
+ //1000ms timeout
+ num_read = serial_read_blocking(serial, buf, 1, 1000);
+ if ((num_read == 1) && (buf[0] == '*')) {
+ return SR_OK;
+ } else {
+ sr_err("ERROR:Serial_w_ack %s failed (%d).", str,
+ num_read);
+ if (num_read) {
+ sr_err("ack resp char %c d %d\n\r", buf[0],
+ buf[0]);
+ }
+ return SR_ERR;
+ }
+}
+
+//Process incoming data stream assuming it is optimized packing of 4 channels or less
+//Each byte is 4 channels of data and a 3 bit rle value, or a larger rle value, or a control signal.
+//This also checks for aborts and ends.
+//If an end is seen we stop processing but do not check the byte_cnt
+//The output is a set of samples fed to process group to perform sw triggering and sending of data to the session
+//as well as maintenance of the serial rx byte cnt.
+//Since we can get huge rle values we chop them up for processing into smaller groups
+//In this mode we can always consume all bytes because there are no cases where the processing of one
+//byte requires the one after it.
+void process_D4(struct sr_dev_inst *sdi, struct dev_context *d)
+{
+ uint32_t j;
+ uint8_t cbyte;
+ uint8_t cval;
+ uint32_t rlecnt = 0;
+ uint32_t sampcnt = 0; //number of samples received with no rles
+ while (d->ser_rdptr < d->bytes_avail) {
+ cbyte = d->buffer[(d->ser_rdptr)];
+ //RLE only byte
+ if (cbyte >= 48 && cbyte <= 127) {
+ rlecnt += (cbyte - 47) * 8;
+ d->byte_cnt++;
+ } else if (cbyte >= 0x80) { //sample with possible rle
+ rlecnt += (cbyte & 0x70) >> 4;
+ if (rlecnt) {
+ //On a value change, duplicate the previous values first.
+ //The maximum value of one rle is 640.
+ //To ensure we don't overflow the sample buffer but still send it large chunks of data
+ //(to make the packet sends to the session efficient) only call process group after
+ //a large number of samples have been seen.
+ //Likely we could use the max rle value of 640 but 2048 gives some extra room.
+ if ((rlecnt + d->cbuf_wrptr) >
+ (d->sample_buf_size - 2048)) {
+ //process_group is sent the number of slices which is just the cbufwrptr divided by the slice size
+ //This modulo check should never happen as long the calculations for dig_sample_bytes etc are
+ //correct, but it's a good cross check for code development.
+ if ((d->cbuf_wrptr) %
+ (d->dig_sample_bytes)) {
+ sr_err
+ ("Modulo fail %d %d ",
+ d->cbuf_wrptr,
+ d->dig_sample_bytes);
+ }
+ process_group(sdi, d,
+ (d->cbuf_wrptr /
+ d->dig_sample_bytes));
+ }
+ rle_memset(d, rlecnt);
+ rlecnt = 0;
+ sampcnt = 0;
+ }
+ //Finally add in the new values
+ cval = cbyte & 0xF;
+ d->d_data_buf[d->cbuf_wrptr++] = cval;
+ //pad in all other bytes since the sessions even wants disabled channels reported
+ for (j = 1; j < d->dig_sample_bytes; j++) {
+ d->d_data_buf[d->cbuf_wrptr++] = 0;
+ }
+ sampcnt++;
+ d->byte_cnt++;
+ sr_spew
+ ("Dchan4 rdptr %d wrptr %d bytein 0x%X rle %d cval 0x%X\n",
+ (d->ser_rdptr) - 1, d->cbuf_wrptr, cbyte,
+ rlecnt, cval);
+ rlecnt = 0;
+
+ d->d_last[0] = cval;
+ }
+ //Any other character ends parsing - it could be a frame error or a start of the final byte cnt
+ else {
+ if (cbyte == '$') {
+ sr_info
+ ("D4 Data stream stops with cbyte %d char %c rdidx %d cnt %llu",
+ cbyte, cbyte, d->ser_rdptr,
+ d->byte_cnt);
+ d->rxstate = RX_STOPPED;
+ } else {
+ sr_err
+ ("D4 Data stream aborts with cbyte %d char %c rdidx %d cnt %llu",
+ cbyte, cbyte, d->ser_rdptr,
+ d->byte_cnt);
+ d->rxstate = RX_ABORT;
+ }
+ break; //break from while loop
+ }
+ (d->ser_rdptr)++;
+ } //while rdptr < wrptr
+ sr_spew("D4 while done rdptr %d", d->ser_rdptr);
+ //If we reach the end of the serial input stream send any remaining values or rles to the session
+ /*this can also be skipped now the rle_memset handles cbufwrptr
+ if(sampcnt){
+ process_group(sdi,d,sampcnt);
+ sampcnt=0;
+ }
+ */
+ if (rlecnt) {
+ sr_spew("Residual D4 slice rlecnt %d", rlecnt);
+ rle_memset(d, rlecnt);
+ }
+ if (d->cbuf_wrptr) {
+ sr_spew("Residual D4 data wrptr %d", d->cbuf_wrptr);
+ process_group(sdi, d, d->cbuf_wrptr / d->dig_sample_bytes);
+
+ }
+
+} //Process_D4
+
+//Process incoming data stream and forward to trigger processing with process_group
+//The final value of ser_rdptr indicates how many bytes were processed.
+//This version handles all other enabled channel configurations that Process_D4 doesn't
+void process_slice(struct sr_dev_inst *sdi, struct dev_context *devc)
+{
+ int32_t i;
+ uint32_t tmp32;
+ uint8_t cbyte;
+ uint32_t slices_avail = 0;
+ uint32_t cword;
+ uint32_t slice_bytes; //number of bytes that have legal slice values
+ //Only process legal data values for this mode which are >=0x80
+ for (slice_bytes = 1; (slice_bytes < devc->bytes_avail)
+ && (devc->buffer[slice_bytes - 1] >= 0x80); slice_bytes++);
+ if (slice_bytes != devc->bytes_avail) {
+ cbyte = devc->buffer[slice_bytes - 1];
+ slice_bytes--; //Don't process the ending character
+ if (cbyte == '$') {
+ sr_info
+ ("Data stream stops with cbyte %d char %c rdidx %d sbytes %d cnt %llu",
+ cbyte, cbyte, devc->ser_rdptr, slice_bytes,
+ devc->byte_cnt);
+ devc->rxstate = RX_STOPPED;
+ } else {
+ sr_err
+ ("Data stream aborts with cbyte %d char %c rdidx %d sbytes %d cnt %llu",
+ cbyte, cbyte, devc->ser_rdptr, slice_bytes,
+ devc->byte_cnt);
+ devc->rxstate = RX_ABORT;
+ }
+ }
+ //If the wrptr is non-zero due to a residual from the previous serial transfer don't double count it towards byte_cnt
+ devc->byte_cnt += slice_bytes - (devc->wrptr);
+ sr_spew("process slice avail %d rdptr %d sb %d byte_cnt %lld",
+ devc->bytes_avail, devc->ser_rdptr, slice_bytes,
+ devc->byte_cnt);
+ //Must have a full slice
+ while ((devc->ser_rdptr + devc->bytes_per_slice) <= slice_bytes) {
+ //The use of devc->cbuf_wrptr is different between analog and digital.
+ //For analog it targets a float sized offset for that channel's buffer
+ //For digital it targets a bit, so the 3 lsbs are bit offsets within a byte
+ slices_avail++;
+ cword = 0;
+ //build up a word 7 bits at a time, using only enabled channels
+ for (i = 0; i < devc->num_d_channels; i += 7) {
+ if (((devc->d_chan_mask) >> i) & 0x7F) {
+ cword |=
+ ((devc->buffer[devc->ser_rdptr]) &
+ 0x7F) << i;
+ (devc->ser_rdptr)++;
+ }
+ }
+ //and then distribute 8 bits at a time to all possible channels
+ for (i = 0; i < devc->num_d_channels; i += 8) {
+ uint32_t idx =
+ ((devc->cbuf_wrptr) * devc->dig_sample_bytes) +
+ (i >> 3);
+ devc->d_data_buf[idx] = cword & 0xFF;
+ sr_spew
+ ("Dchan i %d wrptr %d idx %d char 0x%X cword 0x%X",
+ i, devc->cbuf_wrptr, idx,
+ devc->d_data_buf[idx], cword);
+ cword >>= 8;
+ }
+ //Each analog value is a 7 bit value
+ for (i = 0; i < devc->num_a_channels; i++) {
+ if ((devc->a_chan_mask >> i) & 1) {
+ //a_size is depracted and must always be 1B
+ tmp32 =
+ devc->buffer[devc->ser_rdptr] - 0x80;
+ devc->a_data_bufs[i][devc->cbuf_wrptr] =
+ ((float) tmp32 * devc->a_scale[i]) +
+ devc->a_offset[i];
+ devc->a_last[i] =
+ devc->a_data_bufs[i][devc->cbuf_wrptr];
+ sr_spew
+ ("AChan %d t32 %d value %f wrptr %d rdptr %d sc %f off %f",
+ i, tmp32,
+ devc->
+ a_data_bufs[i][devc->cbuf_wrptr],
+ devc->cbuf_wrptr, devc->ser_rdptr,
+ devc->a_scale[i], devc->a_offset[i]);
+ devc->ser_rdptr++;
+ } //if channel enabled
+ } //for num_a_channels
+ devc->cbuf_wrptr++;
+ } //While another slice available
+ if (slices_avail) {
+ process_group(sdi, devc, slices_avail);
+ }
+
+}
+
+//Send the processed analog values to the session
+int send_analog(struct sr_dev_inst *sdi, struct dev_context *devc,
+ uint32_t num_samples, uint32_t offset)
+{
+ struct sr_datafeed_packet packet;
+ struct sr_datafeed_analog analog;
+ struct sr_analog_encoding encoding;
+ struct sr_analog_meaning meaning;
+ struct sr_analog_spec spec;
+ struct sr_channel *ch;
+ uint32_t i;
+ float *fptr;
- (void)fd;
+ sr_analog_init(&analog, &encoding, &meaning, &spec, ANALOG_DIGITS);
+ for (i = 0; i < devc->num_a_channels; i++) {
+ if ((devc->a_chan_mask >> i) & 1) {
+ ch = devc->analog_groups[i]->channels->data;
+ analog.meaning->channels =
+ g_slist_append(NULL, ch);
+ analog.num_samples = num_samples;
+ analog.data = (devc->a_data_bufs[i]) + offset;
+ fptr = analog.data;
+ sr_spew
+ ("send analog num %d offset %d first %f 2 %f",
+ num_samples, offset, *(devc->a_data_bufs[i]),
+ *fptr);
+ analog.meaning->mq = SR_MQ_VOLTAGE;
+ analog.meaning->unit = SR_UNIT_VOLT;
+ analog.meaning->mqflags = 0;
+ packet.type = SR_DF_ANALOG;
+ packet.payload = &analog;
+ sr_session_send(sdi, &packet);
+ g_slist_free(analog.meaning->channels);
+ } //if enabled
+ } //for channels
+ return 0;
+
+}
+
+//Send the ring buffer of pre-trigger analog samples.
+// The entire buffer is sent (as long as it filled once), but need send two payloads split at the
+// the writeptr
+int send_analog_ring(struct sr_dev_inst *sdi, struct dev_context *devc,
+ uint32_t num_samples)
+{
+ struct sr_datafeed_packet packet;
+ struct sr_datafeed_analog analog;
+ struct sr_analog_encoding encoding;
+ struct sr_analog_meaning meaning;
+ struct sr_analog_spec spec;
+ struct sr_channel *ch;
+ int i;
+ uint32_t num_pre, start_pre;
+ uint32_t num_post, start_post;
+ num_pre =
+ (num_samples >=
+ devc->pretrig_wr_ptr) ? devc->pretrig_wr_ptr : num_samples;
+ start_pre = devc->pretrig_wr_ptr - num_pre;
+ num_post = num_samples - num_pre;
+ start_post = devc->pretrig_entries - num_post;
+ sr_spew
+ ("send_analog ring wrptr %u ns %d npre %u spre %u npost %u spost %u",
+ devc->pretrig_wr_ptr, num_samples, num_pre, start_pre,
+ num_post, start_post);
+ float *fptr;
+ sr_analog_init(&analog, &encoding, &meaning, &spec, ANALOG_DIGITS);
+ for (i = 0; i < devc->num_a_channels; i++) {
+ if ((devc->a_chan_mask >> i) & 1) {
+ ch = devc->analog_groups[i]->channels->data;
+ analog.meaning->channels =
+ g_slist_append(NULL, ch);
+ analog.meaning->mq = SR_MQ_VOLTAGE;
+ analog.meaning->unit = SR_UNIT_VOLT;
+ analog.meaning->mqflags = 0;
+ packet.type = SR_DF_ANALOG;
+ packet.payload = &analog;
+ //First send what is after the write pointer because it is oldest
+ if (num_post) {
+ analog.num_samples = num_post;
+ analog.data =
+ (devc->a_pretrig_bufs[i]) + start_post;
+ //sr_spew("ring buf %d starts at %p",i,(void *) devc->a_pretrig_bufs[i]);
+ //sr_spew("analog data %d starts at %p",i,(void *) analog.data);
+ //sr_spew("Sending A%d ring buffer oldest ",i);
+ for (uint32_t j = 0;
+ j < analog.num_samples; j++) {
+ fptr =
+ analog.data +
+ (j * sizeof(float));
+ //sr_spew("RNGDCT%d j %d %f %p",i,j,*fptr,(void *)fptr);
+ }
+ sr_session_send(sdi, &packet);
+ }
+ if (num_pre) {
+ analog.num_samples = num_pre;
+ analog.data =
+ (devc->a_pretrig_bufs[i]) + start_pre;
+ sr_dbg("Sending A%d ring buffer newest ",
+ i);
+ for (uint32_t j = 0;
+ j < analog.num_samples; j++) {
+ fptr =
+ analog.data +
+ (j * sizeof(float));
+ sr_spew("RNGDCW%d j %d %f %p", i,
+ j, *fptr, (void *) fptr);
+ }
+ sr_session_send(sdi, &packet);
+ }
+ g_slist_free(analog.meaning->channels);
+ sr_dbg("Sending A%d ring buffer done ", i);
+ } //if enabled
+ } //for channels
+ return 0;
+
+}
+
+//Given a chunk of slices forward to trigger check or session as appropriate and update state
+//these could be real slices or those generated by rles
+int process_group(struct sr_dev_inst *sdi, struct dev_context *devc,
+ uint32_t num_slices)
+{
+ int trigger_offset;
+ int pre_trigger_samples;
+ //These are samples sent to session and are less than num_slices if we reach limit_samples
+ size_t num_samples;
+ struct sr_datafeed_logic logic;
+ struct sr_datafeed_packet packet;
+ int i;
+ size_t cbuf_wrptr_cpy;
+ cbuf_wrptr_cpy = devc->cbuf_wrptr;
+ //regardless of whether we forward samples on or not (because we aren't triggered), always reset the
+ //pointer into the device data buffers
+ devc->cbuf_wrptr = 0;
+ if (devc->trigger_fired) { //send directly to session
+ if (devc->limit_samples &&
+ num_slices >
+ devc->limit_samples - devc->sent_samples) {
+ num_samples =
+ devc->limit_samples - devc->sent_samples;
+ } else {
+ num_samples = num_slices;
+ }
+ if (num_samples > 0) {
+ sr_spew
+ ("Process_group sending %d post trig samples dsb %d",
+ num_samples, devc->dig_sample_bytes);
+ //for(int z=0;(z<num_samples);z+=2){
+ // sr_spew("0x%X ",devc->d_data_buf[z]);
+ //}
+ if (devc->num_d_channels) {
+ packet.type = SR_DF_LOGIC;
+ packet.payload = &logic;
+ //Size the number of bytes required to fit all of the channels
+ logic.unitsize = devc->dig_sample_bytes;
+ //The total length of the array sent
+ logic.length =
+ num_samples * logic.unitsize;
+ logic.data = devc->d_data_buf;
+ sr_session_send(sdi, &packet);
+ }
+ send_analog(sdi, devc, num_samples, 0);
+ } //num_sample>0
+ devc->sent_samples += num_samples;
+ return 0;
+ } //trigger_fired
+ else {
+ size_t num_ring_samples;
+ size_t sptr;
+ size_t eptr;
+ size_t numtail;
+ size_t numwrap;
+ size_t srcptr;
+ //sr_spew("Process_group check %d pre trig samples",num_slices);
+ //The trigger_offset is -1 if no trigger is found, but if a trigger is found
+ //then trigger_offset is the offset into the data buffer sent to it.
+ //The pre_trigger_samples is the total number of samples before the trigger, but limited to
+ //the size of the ring buffer set by the capture_ratio. So the pre_trigger_samples can include both the new samples
+ //and the ring buffer, but trigger_offset is only in relation to the new samples
+ trigger_offset = soft_trigger_logic_check(devc->stl,
+ devc->d_data_buf,
+ num_slices *
+ devc->dig_sample_bytes,
+ &pre_trigger_samples);
+ //A trigger offset >=0 indicate a trigger was seen. The stl will isue the trigger to the session
+ //and will forward all pre trigger logic samples, but we must send any post trigger logic
+ //and all pre and post trigger analog signals
+ // sr_dbg("trggr_off %d",trigger_offset);
+ // sr_dbg("pre_samp %d",pre_trigger_samples);
+ if (trigger_offset > -1) {
+ devc->trigger_fired = TRUE;
+ devc->sent_samples += pre_trigger_samples;
+ packet.type = SR_DF_LOGIC;
+ packet.payload = &logic;
+ num_samples = num_slices - trigger_offset;
+//Since we are in continuous mode for SW triggers it is possible to get more samples than limit_samples, so
+//once the trigger fires make sure we don't get beyond limit samples. At this point sent_samples should
+//be equal to pre_trigger_samples (just added above) because without being triggered we'd never increment
+//sent_samples.
+//This number is the number of post trigger logic samples to send to the session, the number of floats
+//is larger because of the analog ring buffer we track.
+ if (devc->limit_samples &&
+ num_samples >
+ devc->limit_samples - devc->sent_samples)
+ num_samples =
+ devc->limit_samples -
+ devc->sent_samples;
+ //The soft trigger logic issues the trigger and sends packest for all logic data that was pretrigger
+ //so only send what is left
+ if (num_samples > 0) {
+ sr_dbg
+ ("Sending post trigger logical remainder of %d",
+ num_samples);
+ logic.length =
+ num_samples * devc->dig_sample_bytes;
+ logic.unitsize = devc->dig_sample_bytes;
+ logic.data =
+ devc->d_data_buf +
+ (trigger_offset *
+ devc->dig_sample_bytes);
+ devc->sent_samples += num_samples;
+ sr_session_send(sdi, &packet);
+ }
+ size_t new_start, new_end, new_samples,
+ ring_samples;
+ //Figure out the analog data to send.
+ //We might need to send:
+ //-some or all of incoming data
+ //-all of incoming data and some of ring buffer
+ //-all of incoming data and all of ring buffer (and still might be short)
+ //We don't need to compare to limit_samples because pretrig_entries can never be more than limit_samples
+ //trigger offset indicatese where in the new samples the trigger was, but we need to go back pretrig_entries before it
+ new_start =
+ (trigger_offset >
+ (int) devc->pretrig_entries) ? trigger_offset
+ - devc->pretrig_entries : 0;
+ //Note that we might not have gotten all the pre triggerstore data we were looking for. In such a case the sw trigger
+ //logic seems to fill up to the limit_samples and thus the ratio is off, but we get the full number of samples
+ //The number of entries in the ring buffer is pre_trigger_samples-trigger_offset so subtract that from limit samples
+ //as a threshold
+ new_end =
+ MIN(num_slices - 1,
+ devc->limit_samples -
+ (pre_trigger_samples - trigger_offset) -
+ 1);
+ //This includes pre and post trigger storage.
+ new_samples = new_end - new_start + 1;
+ //pre_trigger_samples can never be greater than trigger_offset by more than the ring buffer depth (pretrig entries)
+ ring_samples =
+ (pre_trigger_samples >
+ trigger_offset) ? pre_trigger_samples -
+ trigger_offset : 0;
+ sr_spew
+ ("SW trigger float info newstart %zu new_end %zu new_samp %zu ring_samp %zu",
+ new_start, new_end, new_samples,
+ ring_samples);
+ if (ring_samples > 0) {
+ send_analog_ring(sdi, devc, ring_samples);
+ }
+ if (new_samples) {
+ send_analog(sdi, devc, new_samples,
+ new_start);
+ }
+
+ } //if trigger_offset
+ else { //We didn't trigger but need to copy to ring buffer
+ if ((devc->a_chan_mask) && (devc->pretrig_entries)) {
+ //The incoming data buffer could be much larger than the ring buffer, so never copy more than
+ //the size of the ring buffer
+ num_ring_samples =
+ num_slices >
+ devc->
+ pretrig_entries ? devc->pretrig_entries
+ : num_slices;
+ sptr = devc->pretrig_wr_ptr; //starting pointer to copy to
+ //endptr can't go past the end
+ eptr =
+ (sptr + num_ring_samples) >=
+ devc->
+ pretrig_entries ? devc->pretrig_entries
+ - 1 : sptr + num_ring_samples - 1;
+ numtail = (eptr - sptr) + 1; //number of samples to copy to the tail of ring buffer without wrapping
+ numwrap =
+ (num_ring_samples >
+ numtail) ? num_ring_samples -
+ numtail : 0;
+ //cbuf_wrptr points to where the next write should go, not theactual write data
+ srcptr = cbuf_wrptr_cpy - num_ring_samples;
+ sr_spew("RNG num %zu sptr %zu eptr %zu ",
+ num_ring_samples, sptr, eptr);
+ //sr_spew("RNG srcptr %zu nt %zu nw %zu",srcptr,numtail,numwrap);
+ for (i = 0; i < devc->num_a_channels; i++) {
+ if ((devc->a_chan_mask >> i) & 1) {
+ //copy tail
+ for (uint32_t j = 0;
+ j < numtail; j++) {
+ devc->a_pretrig_bufs
+ [i][sptr + j] =
+ devc->a_data_bufs
+ [i]
+ [srcptr + j];
+ //sr_spew("RNGCpyT C%d src %zu dest %zu",i,srcptr+j,sptr+j);
+ } //for j
+ } //if chan_mask
+ } //for channels
+ //Copy wrap
+ srcptr += numtail;
+ for (i = 0; i < devc->num_a_channels; i++) {
+ if ((devc->a_chan_mask >> i) & 1) {
+ for (uint32_t j = 0;
+ j < numwrap; j++) {
+ devc->a_pretrig_bufs
+ [i][j] =
+ devc->a_data_bufs
+ [i]
+ [srcptr + j];
+ //sr_spew("RNGCpyW C%d src %zu dest %zu",i,srcptr+j,j);
+ } //for j
+ } //if chan_mask
+ } //for channels
+ devc->pretrig_wr_ptr =
+ (numwrap) ? numwrap : (eptr +
+ 1) %
+ devc->pretrig_entries;
+ //sr_dbg("RNG pwrptr new %u",devc->pretrig_wr_ptr);
+ } //if any analog channel enabled and pretrig_entries
+ } //else (trigger not detected)
+ } //trigger not set on function entry
+ return 0;
+} //process_group
+
+
+//Duplicate previous sample values
+//This function relies on the caller to ensure d_data_buf has samples to handle the full value of the rle
+void rle_memset(struct dev_context *devc, uint32_t num_slices)
+{
+ uint32_t j, k;
+ sr_spew("rle_memset val 0x%X,slices %d dsb %d\n", devc->d_last[0],
+ num_slices, devc->dig_sample_bytes);
+ //Even if a channel is disabled, PV expects the same location and size for the enabled
+ // channels as if the channel were enabled.
+ for (j = 0; j < num_slices; j++) {
+ for (k = 0; k < devc->dig_sample_bytes; k++) {
+ devc->d_data_buf[devc->cbuf_wrptr++] =
+ devc->d_last[k];
+ //sr_spew("k %d j %d v 0x%X",k,j,devc->d_data_buf[(devc->cbuf_wrptr)-1]);
+ }
+ }
+}
+
+//This callback function is mapped from api.c with serial_source_add and is created after a capture
+//has been setup and is responsible for querying the device trigger status, downloading data
+//and forwarding packets
+SR_PRIV int raspberrypi_pico_receive(int fd, int revents, void *cb_data)
+{
+ struct sr_dev_inst *sdi;
+ struct dev_context *devc;
+ struct sr_serial_dev_inst *serial;
+ uint32_t i;
+ int len;
+ uint32_t bytes_rem;
+ uint32_t residual_bytes;
+ (void) fd;
if (!(sdi = cb_data))
return TRUE;
if (!(devc = sdi->priv))
return TRUE;
+ if (devc->rxstate != RX_ACTIVE) {
+ //This condition is normal operation and expected to happen
+ //but printed as information
+ sr_dbg("Reached non active state in receive %d",
+ devc->rxstate);
+ //don't return - we may be waiting for a final bytecnt
+ //return TRUE;
+ }
+ if (devc->rxstate == RX_IDLE) {
+ //This is the normal end condition where we do one more receive
+ //to make sure we get the full byte_cnt
+ sr_dbg("Reached idle state in receive %d", devc->rxstate);
+ return FALSE;
+ }
+
+ serial = sdi->conn;
+ //return true if it is some kind of event we don't handle
+ if (!(revents == G_IO_IN || revents == 0))
+ return TRUE;
+ //Fill the buffer, note the end may have partial slices
+ bytes_rem = devc->serial_buffer_size - devc->wrptr;
+ //Read one byte less so that we can null it and print as a string
+ //Do a small 10ms timeout, if we get nothing, we'll always come back again
+ len =
+ serial_read_blocking(serial, &(devc->buffer[devc->wrptr]),
+ bytes_rem - 1, 10);
+ sr_spew("Entry wrptr %u bytes_rem %u len %d", devc->wrptr,
+ bytes_rem, len);
+
+ if (len > 0) {
+ devc->buffer[devc->wrptr + len] = 0;
+ //Add the "#" so that spaces are clearly seen
+ sr_dbg("rx string %s#", devc->buffer);
+ //This is not guaranteed to be a dataloss condition, but definitely indicates we are
+ //processing data right at the incoming rate.
+ //With the addition of the byte_cnt sent at the end we will detect any dataloss conditions
+ //and thus this is disabled
+ //if(len>=(int)bytes_rem-8){
+ // sr_err("ERROR: Serial buffer near or at max depth, data from device may have been lost");
+ //}
+ devc->bytes_avail = (devc->wrptr + len);
+ sr_spew
+ ("rx len %d bytes_avail %ul sent_samples %ul wrptr %u",
+ len, devc->bytes_avail, devc->sent_samples,
+ devc->wrptr);
+ //sr_err("rx len %d ",len);
+ } else if (len == 0) {
+ return TRUE;
+ } else {
+ sr_err("ERROR:Negative serial read code %d", len);
+ sdi->driver->dev_acquisition_stop(sdi);
+ return FALSE;
+ } //len>0
+ //This can be used as a bit bucket to drop all samples to see how host processing time effects
+ //the devices ability to send data. Obviously no data will be forwarded to the session so it will hang
+ // return TRUE;
- if (revents == G_IO_IN) {
- /* TODO */
+ //Process the serial read data
+ devc->ser_rdptr = 0;
+ if (devc->rxstate == RX_ACTIVE) {
+ if ((devc->a_chan_mask == 0)
+ && ((devc->d_chan_mask & 0xFFFFFFF0) == 0)) {
+ process_D4(sdi, devc);
+ } else {
+ process_slice(sdi, devc);
+ }
}
+ //process_slice/process_D4 increment ser_rdptr as bytes of the serial buffer are used
+ //But they may not use all of it, and thus the residual unused bytes are shifted to the start of the buffer
+ //for the next call.
+ residual_bytes = devc->bytes_avail - devc->ser_rdptr;
+ //sr_spew("Residuals resid %d avail %d rdptr %d wrptr %d\n",residual_bytes,devc->bytes_avail,devc->ser_rdptr,devc->wrptr);
+ if (residual_bytes) {
+ for (i = 0; i < residual_bytes; i++) {
+ devc->buffer[i] =
+ devc->buffer[i + devc->ser_rdptr];
+ }
+ devc->ser_rdptr = 0;
+ devc->wrptr = residual_bytes;
+ sr_spew("Residual shift rdptr %u wrptr %u",
+ devc->ser_rdptr, devc->wrptr);
+ } else {
+ //If there are no residuals shifted then zero the wrptr since all data is used
+ devc->wrptr = 0;
+ }
+ //ABORT ends immediately
+ if (devc->rxstate == RX_ABORT) {
+ sr_err("Ending receive on abort");
+ sdi->driver->dev_acquisition_stop(sdi);
+ return FALSE; //
+ }
+ //if stopped look for final '+' indicating the full byte_cnt is received
+ if (devc->rxstate == RX_STOPPED) {
+ sr_dbg("Stopped, checking byte_cnt");
+ if (devc->buffer[0] != '$') {
+ //If this happens it means that we got a set of data that was not processed as
+ //whole groups of slice bytes. So either we lost data or are not parsing it correctly.
+ sr_err("ERROR: Stop marker should be byte zero");
+ devc->rxstate = RX_ABORT;
+ sdi->driver->dev_acquisition_stop(sdi);
+ return FALSE;
+ }
+ for (i = 1; i < devc->wrptr; i++) {
+ if (devc->buffer[i] == '+') {
+ devc->buffer[i] = 0;
+ uint64_t rxbytecnt;
+ rxbytecnt = atol((char *)&(devc->buffer[1]));
+ sr_dbg
+ ("Byte_cnt check device cnt %llu host cnt %llu",
+ rxbytecnt, devc->byte_cnt);
+ if (rxbytecnt != devc->byte_cnt) {
+ sr_err
+ ("ERROR: received %llu and counted %llu bytecnts don't match, data may be lost",
+ rxbytecnt, devc->byte_cnt);
+ }
+ //Since we got the bytecnt we know the device is done sending data
+ devc->rxstate = RX_IDLE;
+ //We must always call acquisition_stop on all completed runs
+ sdi->driver->dev_acquisition_stop(sdi);
+ return TRUE;
+ }
+ }
+ //It's possible we need one more serial transfer to get the byte_cnt, so print that here
+ sr_dbg("Haven't seen byte_cnt + yet");
+ } //RX_STOPPED
+ //If at the sample limit, send a "+" in case we are in continuous mode and need
+ //to stop the device. Not that even in non continous mode there might be cases where get an extra
+ //sample or two...
+ if ((devc->sent_samples >= devc->limit_samples)
+ && (devc->rxstate == RX_ACTIVE)) {
+ sr_dbg
+ ("Ending: sent %u of limit %llu samples byte_cnt %llu",
+ devc->sent_samples, devc->limit_samples,
+ devc->byte_cnt);
+ send_serial_char(serial, '+');
+
+ }
+ sr_spew
+ ("Receive function done: sent %u limit %llu wrptr %u len %d",
+ devc->sent_samples, devc->limit_samples, devc->wrptr, len);
return TRUE;
+} //raspberrypi_pico_receive
+
+//Read device specific information from the device
+SR_PRIV int raspberrypi_pico_get_dev_cfg(const struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ struct sr_serial_dev_inst *serial;
+ char *cmd, response[20];
+ gchar **tokens;
+ unsigned int i;
+ int ret, num_tokens;
+
+ devc = sdi->priv;
+ sr_dbg("At get_dev_cfg");
+ serial = sdi->conn;
+ for (i = 0; i < devc->num_a_channels; i++) {
+ cmd = g_strdup_printf("a%d\n", i);
+ ret = send_serial_w_resp(serial, cmd, response, 20);
+ if (ret <= 0) {
+ sr_err
+ ("ERROR:No response from device for analog channel query");
+ return SR_ERR;
+ }
+ //null end of string for strsplit
+ response[ret] = 0;
+ tokens = NULL;
+ tokens = g_strsplit(response, "x", 0);
+ num_tokens = g_strv_length(tokens);
+ if (num_tokens == 2) {
+ devc->a_scale[i] =
+ ((float) atoi(tokens[0])) / 1000000.0;
+ devc->a_offset[i] =
+ ((float) atoi(tokens[1])) / 1000000.0;
+ sr_dbg
+ ("A%d scale %f offset %f response #%s# tokens #%s# #%s#\n",
+ i, devc->a_scale[i], devc->a_offset[i],
+ response, tokens[0], tokens[1]);
+ } else {
+ sr_err
+ ("ERROR:Ascale read c%d got unparseable response %s tokens %d",
+ i, response, num_tokens);
+ //force a legal fixed value assuming a 3.3V scale
+ //a failue in parsing the scale
+ devc->a_scale[i] = 0.0257;
+ devc->a_offset[i] = 0.0;
+ }
+ g_strfreev(tokens);
+ g_free(cmd);
+ }
+
+
+ return SR_OK;
+
}
projects / libsigrok.git / blobdiff