+++ /dev/null
-/*
- * This file is part of the libsigrok project.
- *
- * Copyright (C) 2014 Daniel Elstner <daniel.kitta@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
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include "protocol.h"
-#include <string.h>
-
-/* Bit mask for the RLE repeat-count-follows flag. */
-#define RLE_FLAG_LEN_FOLLOWS ((uint64_t)1 << 35)
-
-/* Start address of capture status memory area to read. */
-#define CAP_STAT_ADDR 5
-
-/* Number of 64-bit words read from the capture status memory. */
-#define CAP_STAT_LEN 5
-
-/* The bitstream filenames are indexed by the clock_config enumeration.
- */
-static const char bitstream_map[][32] = {
- "sysclk-lwla1034-off.rbf",
- "sysclk-lwla1034-int.rbf",
- "sysclk-lwla1034-extpos.rbf",
- "sysclk-lwla1034-extneg.rbf",
-};
-
-/* Submit an already filled-in USB transfer.
- */
-static int submit_transfer(struct dev_context *devc,
- struct libusb_transfer *xfer)
-{
- int ret;
-
- ret = libusb_submit_transfer(xfer);
-
- if (ret != 0) {
- sr_err("Submit transfer failed: %s.", libusb_error_name(ret));
- devc->transfer_error = TRUE;
- return SR_ERR;
- }
-
- return SR_OK;
-}
-
-/* Set up the LWLA in preparation for an acquisition session.
- */
-static int capture_setup(const struct sr_dev_inst *sdi)
-{
- struct dev_context *devc;
- struct acquisition_state *acq;
- uint64_t divider_count;
- uint64_t trigger_mask;
- uint64_t memory_limit;
- uint16_t command[3 + 10*4];
-
- devc = sdi->priv;
- acq = devc->acquisition;
-
- command[0] = LWLA_WORD(CMD_CAP_SETUP);
- command[1] = LWLA_WORD(0); /* address */
- command[2] = LWLA_WORD(10); /* length */
-
- command[3] = LWLA_WORD_0(devc->channel_mask);
- command[4] = LWLA_WORD_1(devc->channel_mask);
- command[5] = LWLA_WORD_2(devc->channel_mask);
- command[6] = LWLA_WORD_3(devc->channel_mask);
-
- /* Set the clock divide counter maximum for samplerates of up to
- * 100 MHz. At the highest samplerate of 125 MHz the clock divider
- * is bypassed.
- */
- if (!acq->bypass_clockdiv && devc->samplerate > 0)
- divider_count = SR_MHZ(100) / devc->samplerate - 1;
- else
- divider_count = 0;
-
- command[7] = LWLA_WORD_0(divider_count);
- command[8] = LWLA_WORD_1(divider_count);
- command[9] = LWLA_WORD_2(divider_count);
- command[10] = LWLA_WORD_3(divider_count);
-
- command[11] = LWLA_WORD_0(devc->trigger_values);
- command[12] = LWLA_WORD_1(devc->trigger_values);
- command[13] = LWLA_WORD_2(devc->trigger_values);
- command[14] = LWLA_WORD_3(devc->trigger_values);
-
- command[15] = LWLA_WORD_0(devc->trigger_edge_mask);
- command[16] = LWLA_WORD_1(devc->trigger_edge_mask);
- command[17] = LWLA_WORD_2(devc->trigger_edge_mask);
- command[18] = LWLA_WORD_3(devc->trigger_edge_mask);
-
- trigger_mask = devc->trigger_mask;
- /* Set bits to select external TRG input edge. */
- if (devc->cfg_trigger_source == TRIGGER_EXT_TRG)
- switch (devc->cfg_trigger_slope) {
- case EDGE_POSITIVE: trigger_mask |= (uint64_t)1 << 35; break;
- case EDGE_NEGATIVE: trigger_mask |= (uint64_t)1 << 34; break;
- }
-
- command[19] = LWLA_WORD_0(trigger_mask);
- command[20] = LWLA_WORD_1(trigger_mask);
- command[21] = LWLA_WORD_2(trigger_mask);
- command[22] = LWLA_WORD_3(trigger_mask);
-
- /* Set the capture memory full threshold. This is slightly less
- * than the actual maximum, most likely in order to compensate for
- * pipeline latency.
- */
- memory_limit = MEMORY_DEPTH - 16;
-
- command[23] = LWLA_WORD_0(memory_limit);
- command[24] = LWLA_WORD_1(memory_limit);
- command[25] = LWLA_WORD_2(memory_limit);
- command[26] = LWLA_WORD_3(memory_limit);
-
- /* Fill remaining 64-bit words with zeroes. */
- memset(&command[27], 0, 16 * sizeof(uint16_t));
-
- return lwla_send_command(sdi->conn, command, G_N_ELEMENTS(command));
-}
-
-/* Issue a register write command as an asynchronous USB transfer.
- */
-static int issue_write_reg(const struct sr_dev_inst *sdi,
- unsigned int reg, unsigned int value)
-{
- struct dev_context *devc;
- struct acquisition_state *acq;
-
- devc = sdi->priv;
- acq = devc->acquisition;
-
- acq->xfer_buf_out[0] = LWLA_WORD(CMD_WRITE_REG);
- acq->xfer_buf_out[1] = LWLA_WORD(reg);
- acq->xfer_buf_out[2] = LWLA_WORD_0(value);
- acq->xfer_buf_out[3] = LWLA_WORD_1(value);
-
- acq->xfer_out->length = 4 * sizeof(uint16_t);
-
- return submit_transfer(devc, acq->xfer_out);
-}
-
-/* Issue a register write command as an asynchronous USB transfer for the
- * next register/value pair of the currently active register write sequence.
- */
-static int issue_next_write_reg(const struct sr_dev_inst *sdi)
-{
- struct dev_context *devc;
- struct regval_pair *regval;
- int ret;
-
- devc = sdi->priv;
-
- if (devc->reg_write_pos >= devc->reg_write_len) {
- sr_err("Already written all registers in sequence.");
- return SR_ERR_BUG;
- }
- regval = &devc->reg_write_seq[devc->reg_write_pos];
-
- ret = issue_write_reg(sdi, regval->reg, regval->val);
- if (ret != SR_OK)
- return ret;
-
- ++devc->reg_write_pos;
- return SR_OK;
-}
-
-/* Issue a capture status request as an asynchronous USB transfer.
- */
-static void request_capture_status(const struct sr_dev_inst *sdi)
-{
- struct dev_context *devc;
- struct acquisition_state *acq;
-
- devc = sdi->priv;
- acq = devc->acquisition;
-
- acq->xfer_buf_out[0] = LWLA_WORD(CMD_CAP_STATUS);
- acq->xfer_buf_out[1] = LWLA_WORD(CAP_STAT_ADDR);
- acq->xfer_buf_out[2] = LWLA_WORD(CAP_STAT_LEN);
-
- acq->xfer_out->length = 3 * sizeof(uint16_t);
-
- if (submit_transfer(devc, acq->xfer_out) == SR_OK)
- devc->state = STATE_STATUS_REQUEST;
-}
-
-/* Issue a request for the capture buffer fill level as
- * an asynchronous USB transfer.
- */
-static void request_capture_length(const struct sr_dev_inst *sdi)
-{
- struct dev_context *devc;
- struct acquisition_state *acq;
-
- devc = sdi->priv;
- acq = devc->acquisition;
-
- acq->xfer_buf_out[0] = LWLA_WORD(CMD_READ_REG);
- acq->xfer_buf_out[1] = LWLA_WORD(REG_MEM_FILL);
-
- acq->xfer_out->length = 2 * sizeof(uint16_t);
-
- if (submit_transfer(devc, acq->xfer_out) == SR_OK)
- devc->state = STATE_LENGTH_REQUEST;
-}
-
-/* Initiate the capture memory read operation: Reset the acquisition state
- * and start a sequence of register writes in order to set up the device for
- * reading from the capture buffer.
- */
-static void issue_read_start(const struct sr_dev_inst *sdi)
-{
- struct dev_context *devc;
- struct acquisition_state *acq;
- struct regval_pair *regvals;
-
- devc = sdi->priv;
- acq = devc->acquisition;
-
- /* Reset RLE state. */
- acq->rle = RLE_STATE_DATA;
- acq->sample = 0;
- acq->run_len = 0;
-
- acq->samples_done = 0;
-
- /* For some reason, the start address is 4 rather than 0. */
- acq->mem_addr_done = 4;
- acq->mem_addr_next = 4;
- acq->mem_addr_stop = acq->mem_addr_fill;
-
- /* Sample position in the packet output buffer. */
- acq->out_index = 0;
-
- regvals = devc->reg_write_seq;
-
- regvals[0].reg = REG_DIV_BYPASS;
- regvals[0].val = 1;
-
- regvals[1].reg = REG_MEM_CTRL2;
- regvals[1].val = 2;
-
- regvals[2].reg = REG_MEM_CTRL4;
- regvals[2].val = 4;
-
- devc->reg_write_pos = 0;
- devc->reg_write_len = 3;
-
- if (issue_next_write_reg(sdi) == SR_OK)
- devc->state = STATE_READ_PREPARE;
-}
-
-/* Issue a command as an asynchronous USB transfer which returns the device
- * to normal state after a read operation. Sets a new device context state
- * on success.
- */
-static void issue_read_end(const struct sr_dev_inst *sdi)
-{
- struct dev_context *devc;
-
- devc = sdi->priv;
-
- if (issue_write_reg(sdi, REG_DIV_BYPASS, 0) == SR_OK)
- devc->state = STATE_READ_END;
-}
-
-/* Decode an incoming reponse to a buffer fill level request and act on it
- * as appropriate. Note that this function changes the device context state.
- */
-static void process_capture_length(const struct sr_dev_inst *sdi)
-{
- struct dev_context *devc;
- struct acquisition_state *acq;
-
- devc = sdi->priv;
- acq = devc->acquisition;
-
- if (acq->xfer_in->actual_length != 4) {
- sr_err("Received size %d doesn't match expected size 4.",
- acq->xfer_in->actual_length);
- devc->transfer_error = TRUE;
- return;
- }
- acq->mem_addr_fill = LWLA_TO_UINT32(acq->xfer_buf_in[0]);
-
- sr_dbg("%zu words in capture buffer.", acq->mem_addr_fill);
-
- if (acq->mem_addr_fill > 0 && sdi->status == SR_ST_ACTIVE)
- issue_read_start(sdi);
- else
- issue_read_end(sdi);
-}
-
-/* Initiate a sequence of register write commands with the effect of
- * cancelling a running capture operation. This sets a new device state
- * if issuing the first command succeeds.
- */
-static void issue_stop_capture(const struct sr_dev_inst *sdi)
-{
- struct dev_context *devc;
- struct regval_pair *regvals;
-
- devc = sdi->priv;
-
- if (devc->stopping_in_progress)
- return;
-
- regvals = devc->reg_write_seq;
-
- regvals[0].reg = REG_CMD_CTRL2;
- regvals[0].val = 10;
-
- regvals[1].reg = REG_CMD_CTRL3;
- regvals[1].val = 0;
-
- regvals[2].reg = REG_CMD_CTRL4;
- regvals[2].val = 0;
-
- regvals[3].reg = REG_CMD_CTRL1;
- regvals[3].val = 0;
-
- regvals[4].reg = REG_DIV_BYPASS;
- regvals[4].val = 0;
-
- devc->reg_write_pos = 0;
- devc->reg_write_len = 5;
-
- if (issue_next_write_reg(sdi) == SR_OK) {
- devc->stopping_in_progress = TRUE;
- devc->state = STATE_STOP_CAPTURE;
- }
-}
-
-/* Decode an incoming capture status reponse and act on it as appropriate.
- * Note that this function changes the device state.
- */
-static void process_capture_status(const struct sr_dev_inst *sdi)
-{
- uint64_t duration;
- struct dev_context *devc;
- struct acquisition_state *acq;
- unsigned int mem_fill;
- unsigned int flags;
-
- devc = sdi->priv;
- acq = devc->acquisition;
-
- if (acq->xfer_in->actual_length != CAP_STAT_LEN * 8) {
- sr_err("Received size %d doesn't match expected size %d.",
- acq->xfer_in->actual_length, CAP_STAT_LEN * 8);
- devc->transfer_error = TRUE;
- return;
- }
-
- /* TODO: Find out the actual bit width of these fields as stored
- * in the FPGA. These fields are definitely less than 64 bit wide
- * internally, and the unused bits occasionally even contain garbage.
- */
- mem_fill = LWLA_TO_UINT32(acq->xfer_buf_in[0]);
- duration = LWLA_TO_UINT32(acq->xfer_buf_in[4]);
- flags = LWLA_TO_UINT32(acq->xfer_buf_in[8]) & STATUS_FLAG_MASK;
-
- /* The LWLA1034 runs at 125 MHz if the clock divider is bypassed.
- * However, the time base used for the duration is apparently not
- * adjusted for this "boost" mode. Whereas normally the duration
- * unit is 1 ms, it is 0.8 ms when the clock divider is bypassed.
- * As 0.8 = 100 MHz / 125 MHz, it seems that the internal cycle
- * counter period is the same as at the 100 MHz setting.
- */
- if (acq->bypass_clockdiv)
- acq->duration_now = duration * 4 / 5;
- else
- acq->duration_now = duration;
-
- sr_spew("Captured %u words, %" PRIu64 " ms, flags 0x%02X.",
- mem_fill, acq->duration_now, flags);
-
- if ((flags & STATUS_TRIGGERED) > (acq->capture_flags & STATUS_TRIGGERED))
- sr_info("Capture triggered.");
-
- acq->capture_flags = flags;
-
- if (acq->duration_now >= acq->duration_max) {
- sr_dbg("Time limit reached, stopping capture.");
- issue_stop_capture(sdi);
- return;
- }
- devc->state = STATE_STATUS_WAIT;
-
- if ((acq->capture_flags & STATUS_TRIGGERED) == 0) {
- sr_spew("Waiting for trigger.");
- } else if ((acq->capture_flags & STATUS_MEM_AVAIL) == 0) {
- sr_dbg("Capture memory filled.");
- request_capture_length(sdi);
- } else if ((acq->capture_flags & STATUS_CAPTURING) != 0) {
- sr_spew("Sampling in progress.");
- }
-}
-
-/* Issue a capture buffer read request as an asynchronous USB transfer.
- * The address and size of the memory area to read are derived from the
- * current acquisition state.
- */
-static void request_read_mem(const struct sr_dev_inst *sdi)
-{
- struct dev_context *devc;
- struct acquisition_state *acq;
- size_t count;
-
- devc = sdi->priv;
- acq = devc->acquisition;
-
- if (acq->mem_addr_next >= acq->mem_addr_stop)
- return;
-
- /* Always read a multiple of 8 device words. */
- count = (acq->mem_addr_stop - acq->mem_addr_next + 7) / 8 * 8;
- count = MIN(count, READ_CHUNK_LEN);
-
- acq->xfer_buf_out[0] = LWLA_WORD(CMD_READ_MEM);
- acq->xfer_buf_out[1] = LWLA_WORD_0(acq->mem_addr_next);
- acq->xfer_buf_out[2] = LWLA_WORD_1(acq->mem_addr_next);
- acq->xfer_buf_out[3] = LWLA_WORD_0(count);
- acq->xfer_buf_out[4] = LWLA_WORD_1(count);
-
- acq->xfer_out->length = 5 * sizeof(uint16_t);
-
- if (submit_transfer(devc, acq->xfer_out) == SR_OK) {
- acq->mem_addr_next += count;
- devc->state = STATE_READ_REQUEST;
- }
-}
-
-/* Demangle and decompress incoming sample data from the capture buffer.
- * The data chunk is taken from the acquisition state, and is expected to
- * contain a multiple of 8 device words.
- * All data currently in the acquisition buffer will be processed. Packets
- * of decoded samples are sent off to the session bus whenever the output
- * buffer becomes full while decoding.
- */
-static int process_sample_data(const struct sr_dev_inst *sdi)
-{
- uint64_t sample;
- uint64_t high_nibbles;
- uint64_t word;
- struct dev_context *devc;
- struct acquisition_state *acq;
- uint8_t *out_p;
- uint32_t *slice;
- struct sr_datafeed_packet packet;
- struct sr_datafeed_logic logic;
- size_t expect_len;
- size_t actual_len;
- size_t out_max_samples;
- size_t out_run_samples;
- size_t ri;
- size_t in_words_left;
- size_t si;
-
- devc = sdi->priv;
- acq = devc->acquisition;
-
- if (acq->mem_addr_done >= acq->mem_addr_stop
- || acq->samples_done >= acq->samples_max)
- return SR_OK;
-
- in_words_left = MIN(acq->mem_addr_stop - acq->mem_addr_done,
- READ_CHUNK_LEN);
- expect_len = LWLA1034_MEMBUF_LEN(in_words_left) * sizeof(uint32_t);
- actual_len = acq->xfer_in->actual_length;
-
- if (actual_len != expect_len) {
- sr_err("Received size %zu does not match expected size %zu.",
- actual_len, expect_len);
- devc->transfer_error = TRUE;
- return SR_ERR;
- }
- acq->mem_addr_done += in_words_left;
-
- /* Prepare session packet. */
- packet.type = SR_DF_LOGIC;
- packet.payload = &logic;
- logic.unitsize = UNIT_SIZE;
- logic.data = acq->out_packet;
-
- slice = acq->xfer_buf_in;
- si = 0; /* word index within slice */
-
- for (;;) {
- /* Calculate number of samples to write into packet. */
- out_max_samples = MIN(acq->samples_max - acq->samples_done,
- PACKET_LENGTH - acq->out_index);
- out_run_samples = MIN(acq->run_len, out_max_samples);
-
- /* Expand run-length samples into session packet. */
- sample = acq->sample;
- out_p = &acq->out_packet[acq->out_index * UNIT_SIZE];
-
- for (ri = 0; ri < out_run_samples; ++ri) {
- out_p[0] = sample & 0xFF;
- out_p[1] = (sample >> 8) & 0xFF;
- out_p[2] = (sample >> 16) & 0xFF;
- out_p[3] = (sample >> 24) & 0xFF;
- out_p[4] = (sample >> 32) & 0xFF;
- out_p += UNIT_SIZE;
- }
- acq->run_len -= out_run_samples;
- acq->out_index += out_run_samples;
- acq->samples_done += out_run_samples;
-
- /* Packet full or sample count limit reached? */
- if (out_run_samples == out_max_samples) {
- logic.length = acq->out_index * UNIT_SIZE;
- sr_session_send(sdi, &packet);
- acq->out_index = 0;
-
- if (acq->samples_done >= acq->samples_max)
- return SR_OK; /* sample limit reached */
- if (acq->run_len > 0)
- continue; /* need another packet */
- }
-
- if (in_words_left == 0)
- break; /* done with current chunk */
-
- /* Now work on the current slice. */
- high_nibbles = LWLA_TO_UINT32(slice[8]);
- word = LWLA_TO_UINT32(slice[si]);
- word |= (high_nibbles << (4 * si + 4)) & ((uint64_t)0xF << 32);
-
- if (acq->rle == RLE_STATE_DATA) {
- acq->sample = word & ALL_CHANNELS_MASK;
- acq->run_len = ((word >> NUM_CHANNELS) & 1) + 1;
- if (word & RLE_FLAG_LEN_FOLLOWS)
- acq->rle = RLE_STATE_LEN;
- } else {
- acq->run_len += word << 1;
- acq->rle = RLE_STATE_DATA;
- }
-
- /* Move to next word. */
- si = (si + 1) % 8;
- if (si == 0)
- slice += 9;
- --in_words_left;
- }
-
- /* Send out partially filled packet if this was the last chunk. */
- if (acq->mem_addr_done >= acq->mem_addr_stop && acq->out_index > 0) {
- logic.length = acq->out_index * UNIT_SIZE;
- sr_session_send(sdi, &packet);
- acq->out_index = 0;
- }
- return SR_OK;
-}
-
-/* Finish an acquisition session. This sends the end packet to the session
- * bus and removes the listener for asynchronous USB transfers.
- */
-static void end_acquisition(struct sr_dev_inst *sdi)
-{
- struct drv_context *drvc;
- struct dev_context *devc;
- struct sr_datafeed_packet packet;
-
- drvc = sdi->driver->priv;
- devc = sdi->priv;
-
- if (devc->state == STATE_IDLE)
- return;
-
- devc->state = STATE_IDLE;
-
- /* Remove USB file descriptors from polling. */
- usb_source_remove(sdi->session, drvc->sr_ctx);
-
- packet.type = SR_DF_END;
- sr_session_send(sdi, &packet);
-
- lwla_free_acquisition_state(devc->acquisition);
- devc->acquisition = NULL;
-
- sdi->status = SR_ST_ACTIVE;
-}
-
-/* USB output transfer completion callback.
- */
-static void receive_transfer_out(struct libusb_transfer *transfer)
-{
- struct sr_dev_inst *sdi;
- struct dev_context *devc;
-
- sdi = transfer->user_data;
- devc = sdi->priv;
-
- if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
- sr_err("Transfer to device failed: %d.", transfer->status);
- devc->transfer_error = TRUE;
- return;
- }
-
- if (devc->reg_write_pos < devc->reg_write_len) {
- issue_next_write_reg(sdi);
- } else {
- switch (devc->state) {
- case STATE_START_CAPTURE:
- devc->state = STATE_STATUS_WAIT;
- break;
- case STATE_STATUS_REQUEST:
- devc->state = STATE_STATUS_RESPONSE;
- submit_transfer(devc, devc->acquisition->xfer_in);
- break;
- case STATE_STOP_CAPTURE:
- if (sdi->status == SR_ST_ACTIVE)
- request_capture_length(sdi);
- else
- end_acquisition(sdi);
- break;
- case STATE_LENGTH_REQUEST:
- devc->state = STATE_LENGTH_RESPONSE;
- submit_transfer(devc, devc->acquisition->xfer_in);
- break;
- case STATE_READ_PREPARE:
- request_read_mem(sdi);
- break;
- case STATE_READ_REQUEST:
- devc->state = STATE_READ_RESPONSE;
- submit_transfer(devc, devc->acquisition->xfer_in);
- break;
- case STATE_READ_END:
- end_acquisition(sdi);
- break;
- default:
- sr_err("Unexpected device state %d.", devc->state);
- break;
- }
- }
-}
-
-/* USB input transfer completion callback.
- */
-static void receive_transfer_in(struct libusb_transfer *transfer)
-{
- struct sr_dev_inst *sdi;
- struct dev_context *devc;
- struct acquisition_state *acq;
-
- sdi = transfer->user_data;
- devc = sdi->priv;
- acq = devc->acquisition;
-
- if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {
- sr_err("Transfer from device failed: %d.", transfer->status);
- devc->transfer_error = TRUE;
- return;
- }
-
- switch (devc->state) {
- case STATE_STATUS_RESPONSE:
- process_capture_status(sdi);
- break;
- case STATE_LENGTH_RESPONSE:
- process_capture_length(sdi);
- break;
- case STATE_READ_RESPONSE:
- if (process_sample_data(sdi) == SR_OK
- && acq->mem_addr_next < acq->mem_addr_stop
- && acq->samples_done < acq->samples_max)
- request_read_mem(sdi);
- else
- issue_read_end(sdi);
- break;
- default:
- sr_err("Unexpected device state %d.", devc->state);
- break;
- }
-}
-
-/* Initialize the LWLA. This downloads a bitstream into the FPGA
- * and executes a simple device test sequence.
- */
-SR_PRIV int lwla_init_device(const struct sr_dev_inst *sdi)
-{
- struct dev_context *devc;
- int ret;
- uint32_t value;
-
- devc = sdi->priv;
-
- /* Force reload of bitstream */
- devc->cur_clock_config = CONF_CLOCK_NONE;
-
- ret = lwla_set_clock_config(sdi);
-
- if (ret != SR_OK)
- return ret;
-
- ret = lwla_write_reg(sdi->conn, REG_CMD_CTRL2, 100);
- if (ret != SR_OK)
- return ret;
-
- ret = lwla_read_reg(sdi->conn, REG_CMD_CTRL1, &value);
- if (ret != SR_OK)
- return ret;
- sr_dbg("Received test word 0x%08X back.", value);
- if (value != 0x12345678)
- return SR_ERR;
-
- ret = lwla_read_reg(sdi->conn, REG_CMD_CTRL4, &value);
- if (ret != SR_OK)
- return ret;
- sr_dbg("Received test word 0x%08X back.", value);
- if (value != 0x12345678)
- return SR_ERR;
-
- ret = lwla_read_reg(sdi->conn, REG_CMD_CTRL3, &value);
- if (ret != SR_OK)
- return ret;
- sr_dbg("Received test word 0x%08X back.", value);
- if (value != 0x87654321)
- return SR_ERR;
-
- return ret;
-}
-
-SR_PRIV int lwla_convert_trigger(const struct sr_dev_inst *sdi)
-{
- struct dev_context *devc;
- struct sr_trigger *trigger;
- struct sr_trigger_stage *stage;
- struct sr_trigger_match *match;
- const GSList *l, *m;
- uint64_t channel_index;
-
- devc = sdi->priv;
-
- devc->trigger_mask = 0;
- devc->trigger_values = 0;
- devc->trigger_edge_mask = 0;
-
- if (!(trigger = sr_session_trigger_get(sdi->session)))
- return SR_OK;
-
- if (g_slist_length(trigger->stages) > 1) {
- sr_err("This device only supports 1 trigger stage.");
- return SR_ERR;
- }
-
- for (l = trigger->stages; l; l = l->next) {
- stage = l->data;
- for (m = stage->matches; m; m = m->next) {
- match = m->data;
- if (!match->channel->enabled)
- /* Ignore disabled channels with a trigger. */
- continue;
- channel_index = 1 << match->channel->index;
- devc->trigger_mask |= channel_index;
- switch (match->match) {
- case SR_TRIGGER_ONE:
- devc->trigger_values |= channel_index;
- break;
- case SR_TRIGGER_RISING:
- devc->trigger_values |= channel_index;
- /* Fall through for edge mask. */
- case SR_TRIGGER_FALLING:
- devc->trigger_edge_mask |= channel_index;
- break;
- }
- }
- }
-
- return SR_OK;
-}
-
-/* Select the LWLA clock configuration. If the clock source changed from
- * the previous setting, this will download a new bitstream to the FPGA.
- */
-SR_PRIV int lwla_set_clock_config(const struct sr_dev_inst *sdi)
-{
- struct dev_context *devc;
- int ret;
- enum clock_config choice;
-
- devc = sdi->priv;
-
- if (sdi->status == SR_ST_INACTIVE)
- choice = CONF_CLOCK_NONE;
- else if (devc->cfg_clock_source == CLOCK_INTERNAL)
- choice = CONF_CLOCK_INT;
- else if (devc->cfg_clock_edge == EDGE_POSITIVE)
- choice = CONF_CLOCK_EXT_RISE;
- else
- choice = CONF_CLOCK_EXT_FALL;
-
- if (choice != devc->cur_clock_config) {
- devc->cur_clock_config = CONF_CLOCK_NONE;
- ret = lwla_send_bitstream(sdi->conn, bitstream_map[choice]);
- if (ret == SR_OK)
- devc->cur_clock_config = choice;
- return ret;
- }
- return SR_OK;
-}
-
-/* Configure the LWLA in preparation for an acquisition session.
- */
-SR_PRIV int lwla_setup_acquisition(const struct sr_dev_inst *sdi)
-{
- struct dev_context *devc;
- struct sr_usb_dev_inst *usb;
- struct acquisition_state *acq;
- struct regval_pair regvals[7];
- int ret;
-
- devc = sdi->priv;
- usb = sdi->conn;
- acq = devc->acquisition;
-
- if (devc->limit_msec > 0) {
- acq->duration_max = devc->limit_msec;
- sr_info("Acquisition time limit %" PRIu64 " ms.",
- devc->limit_msec);
- } else
- acq->duration_max = MAX_LIMIT_MSEC;
-
- if (devc->limit_samples > 0) {
- acq->samples_max = devc->limit_samples;
- sr_info("Acquisition sample count limit %" PRIu64 ".",
- devc->limit_samples);
- } else
- acq->samples_max = MAX_LIMIT_SAMPLES;
-
- if (devc->cfg_clock_source == CLOCK_INTERNAL) {
- sr_info("Internal clock, samplerate %" PRIu64 ".",
- devc->samplerate);
- if (devc->samplerate == 0)
- return SR_ERR_BUG;
- /* At 125 MHz, the clock divider is bypassed. */
- acq->bypass_clockdiv = (devc->samplerate > SR_MHZ(100));
-
- /* If only one of the limits is set, derive the other one. */
- if (devc->limit_msec == 0 && devc->limit_samples > 0)
- acq->duration_max = devc->limit_samples
- * 1000 / devc->samplerate + 1;
- else if (devc->limit_samples == 0 && devc->limit_msec > 0)
- acq->samples_max = devc->limit_msec
- * devc->samplerate / 1000;
- } else {
- acq->bypass_clockdiv = TRUE;
-
- if (devc->cfg_clock_edge == EDGE_NEGATIVE)
- sr_info("External clock, falling edge.");
- else
- sr_info("External clock, rising edge.");
- }
-
- regvals[0].reg = REG_MEM_CTRL2;
- regvals[0].val = 2;
-
- regvals[1].reg = REG_MEM_CTRL2;
- regvals[1].val = 1;
-
- regvals[2].reg = REG_CMD_CTRL2;
- regvals[2].val = 10;
-
- regvals[3].reg = REG_CMD_CTRL3;
- regvals[3].val = 0x74;
-
- regvals[4].reg = REG_CMD_CTRL4;
- regvals[4].val = 0;
-
- regvals[5].reg = REG_CMD_CTRL1;
- regvals[5].val = 0;
-
- regvals[6].reg = REG_DIV_BYPASS;
- regvals[6].val = acq->bypass_clockdiv;
-
- ret = lwla_write_regs(usb, regvals, G_N_ELEMENTS(regvals));
- if (ret != SR_OK)
- return ret;
-
- return capture_setup(sdi);
-}
-
-/* Start the capture operation on the LWLA device. Beginning with this
- * function, all USB transfers will be asynchronous until the end of the
- * acquisition session.
- */
-SR_PRIV int lwla_start_acquisition(const struct sr_dev_inst *sdi)
-{
- struct dev_context *devc;
- struct sr_usb_dev_inst *usb;
- struct acquisition_state *acq;
- struct regval_pair *regvals;
-
- devc = sdi->priv;
- usb = sdi->conn;
- acq = devc->acquisition;
-
- acq->duration_now = 0;
- acq->mem_addr_fill = 0;
- acq->capture_flags = 0;
-
- libusb_fill_bulk_transfer(acq->xfer_out, usb->devhdl, EP_COMMAND,
- (unsigned char *)acq->xfer_buf_out, 0,
- &receive_transfer_out,
- (struct sr_dev_inst *)sdi, USB_TIMEOUT);
-
- libusb_fill_bulk_transfer(acq->xfer_in, usb->devhdl, EP_REPLY,
- (unsigned char *)acq->xfer_buf_in,
- sizeof acq->xfer_buf_in,
- &receive_transfer_in,
- (struct sr_dev_inst *)sdi, USB_TIMEOUT);
-
- regvals = devc->reg_write_seq;
-
- regvals[0].reg = REG_CMD_CTRL2;
- regvals[0].val = 10;
-
- regvals[1].reg = REG_CMD_CTRL3;
- regvals[1].val = 1;
-
- regvals[2].reg = REG_CMD_CTRL4;
- regvals[2].val = 0;
-
- regvals[3].reg = REG_CMD_CTRL1;
- regvals[3].val = 0;
-
- devc->reg_write_pos = 0;
- devc->reg_write_len = 4;
-
- devc->state = STATE_START_CAPTURE;
-
- return issue_next_write_reg(sdi);
-}
-
-/* Allocate an acquisition state object.
- */
-SR_PRIV struct acquisition_state *lwla_alloc_acquisition_state(void)
-{
- struct acquisition_state *acq;
-
- acq = g_try_new0(struct acquisition_state, 1);
- if (!acq) {
- sr_err("Acquisition state malloc failed.");
- return NULL;
- }
-
- acq->xfer_in = libusb_alloc_transfer(0);
- if (!acq->xfer_in) {
- sr_err("Transfer malloc failed.");
- g_free(acq);
- return NULL;
- }
-
- acq->xfer_out = libusb_alloc_transfer(0);
- if (!acq->xfer_out) {
- sr_err("Transfer malloc failed.");
- libusb_free_transfer(acq->xfer_in);
- g_free(acq);
- return NULL;
- }
-
- return acq;
-}
-
-/* Deallocate an acquisition state object.
- */
-SR_PRIV void lwla_free_acquisition_state(struct acquisition_state *acq)
-{
- if (acq) {
- libusb_free_transfer(acq->xfer_out);
- libusb_free_transfer(acq->xfer_in);
- g_free(acq);
- }
-}
-
-/* USB I/O source callback.
- */
-SR_PRIV int lwla_receive_data(int fd, int revents, void *cb_data)
-{
- struct sr_dev_inst *sdi;
- struct dev_context *devc;
- struct drv_context *drvc;
- struct timeval tv;
- int ret;
-
- (void)fd;
-
- sdi = cb_data;
- devc = sdi->priv;
- drvc = sdi->driver->priv;
-
- if (!devc || !drvc)
- return FALSE;
-
- /* No timeout: return immediately. */
- tv.tv_sec = 0;
- tv.tv_usec = 0;
-
- ret = libusb_handle_events_timeout_completed(drvc->sr_ctx->libusb_ctx,
- &tv, NULL);
- if (ret != 0)
- sr_err("Event handling failed: %s.", libusb_error_name(ret));
-
- /* If no event flags are set the timeout must have expired. */
- if (revents == 0 && devc->state == STATE_STATUS_WAIT) {
- if (sdi->status == SR_ST_STOPPING)
- issue_stop_capture(sdi);
- else
- request_capture_status(sdi);
- }
-
- /* Check if an error occurred on a transfer. */
- if (devc->transfer_error)
- end_acquisition(sdi);
-
- return TRUE;
-}
projects / libsigrok.git / blobdiff