88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
/*
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* This file is part of the libsigrok project.
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*
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* Copyright (C) 2015 Sergey Alirzaev <zl29ah@gmail.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <ftdi.h>
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#include "protocol.h"
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static void send_samples(struct dev_context *devc, uint64_t samples_to_send)
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{
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struct sr_datafeed_packet packet;
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struct sr_datafeed_logic logic;
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sr_spew("Sending %" PRIu64 " samples.", samples_to_send);
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packet.type = SR_DF_LOGIC;
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packet.payload = &logic;
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logic.length = samples_to_send;
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logic.unitsize = 1;
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logic.data = devc->data_buf;
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sr_session_send(devc->cb_data, &packet);
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devc->samples_sent += samples_to_send;
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devc->bytes_received -= samples_to_send;
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}
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SR_PRIV int ft2232h_receive_data(int fd, int revents, void *cb_data)
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{
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struct sr_dev_inst *sdi;
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struct dev_context *devc;
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int bytes_read;
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uint64_t n;
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(void)fd;
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(void)revents;
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if (!(sdi = cb_data))
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return TRUE;
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if (!(devc = sdi->priv))
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return TRUE;
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if (!(revents == G_IO_IN || revents == 0))
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return TRUE;
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if (!devc->ftdic)
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return TRUE;
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/* Get a block of data. */
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bytes_read = ftdi_read_data(devc->ftdic, devc->data_buf, DATA_BUF_SIZE);
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if (bytes_read < 0) {
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sr_err("Failed to read FTDI data (%d): %s.",
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bytes_read, ftdi_get_error_string(devc->ftdic));
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sdi->driver->dev_acquisition_stop(sdi, sdi);
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return FALSE;
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}
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if (bytes_read == 0) {
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sr_spew("Received 0 bytes, nothing to do.");
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return TRUE;
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}
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sr_spew("Got some data.");
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devc->bytes_received += bytes_read;
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n = devc->samples_sent + devc->bytes_received;
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if (devc->limit_samples && (n >= devc->limit_samples)) {
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send_samples(devc, devc->limit_samples - devc->samples_sent);
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sr_info("Requested number of samples reached.");
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sdi->driver->dev_acquisition_stop(sdi, cb_data);
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return TRUE;
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} else {
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send_samples(devc, devc->bytes_received);
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}
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return TRUE;
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}
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