--- /dev/null
+/* -*- c++ -*- */
+/*
+ * Copyright 2005 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio 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, or (at your option)
+ * any later version.
+ *
+ * GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <sys/mman.h>
+
+#include <comedi_sink_s.h>
+#include <gr_io_signature.h>
+#include <stdio.h>
+#include <errno.h>
+#include <iostream>
+#include <stdexcept>
+#include <gri_comedi.h>
+
+
+/*
+ * comedi_sink_s is untested because I don't own appropriate hardware.
+ * Feedback is welcome! --SF
+ */
+
+static std::string
+default_device_name ()
+{
+ return "/dev/comedi0";
+}
+
+
+// ----------------------------------------------------------------
+
+comedi_sink_s_sptr
+comedi_make_sink_s (int sampling_freq, const std::string dev)
+{
+ return comedi_sink_s_sptr (new comedi_sink_s (sampling_freq, dev));
+}
+
+comedi_sink_s::comedi_sink_s (int sampling_freq,
+ const std::string device_name)
+ : gr_sync_block ("comedi_sink_s",
+ gr_make_io_signature (0, 0, 0),
+ gr_make_io_signature (0, 0, 0)),
+ d_sampling_freq (sampling_freq),
+ d_device_name (device_name.empty() ? default_device_name() : device_name),
+ d_dev (0),
+ d_subdevice (COMEDI_SUBD_AO),
+ d_n_chan (1), // number of input channels
+ d_map (0),
+ d_buffer_size (0),
+ d_buf_front (0),
+ d_buf_back (0)
+{
+ int aref=AREF_GROUND;
+ int range=0;
+
+ d_dev = comedi_open(d_device_name.c_str());
+ if (d_dev == 0){
+ comedi_perror(d_device_name.c_str());
+ throw std::runtime_error ("comedi_sink_s");
+ }
+
+ unsigned int chanlist[256];
+
+ for(int i=0; i<d_n_chan; i++){
+ chanlist[i]=CR_PACK(i,range,aref);
+ }
+
+ comedi_cmd cmd;
+ int ret;
+
+ ret = comedi_get_cmd_generic_timed(d_dev,d_subdevice,&cmd,(unsigned int)(1e9/sampling_freq));
+ if(ret<0)
+ bail ("comedi_get_cmd_generic_timed", comedi_errno());
+
+ // TODO: check period_ns is not to far off sampling_freq
+
+ d_buffer_size = comedi_get_buffer_size(d_dev, d_subdevice);
+ if (d_buffer_size <= 0)
+ bail ("comedi_get_buffer_size", comedi_errno());
+
+ d_map = mmap(NULL,d_buffer_size,PROT_WRITE,MAP_SHARED,comedi_fileno(d_dev),0);
+ if (d_map == MAP_FAILED)
+ bail ("mmap", errno);
+
+ cmd.chanlist = chanlist;
+ cmd.chanlist_len = d_n_chan;
+ cmd.scan_end_arg = d_n_chan;
+
+ cmd.stop_src=TRIG_NONE;
+ cmd.stop_arg=0;
+
+ /* comedi_command_test() tests a command to see if the
+ * trigger sources and arguments are valid for the subdevice.
+ * If a trigger source is invalid, it will be logically ANDed
+ * with valid values (trigger sources are actually bitmasks),
+ * which may or may not result in a valid trigger source.
+ * If an argument is invalid, it will be adjusted to the
+ * nearest valid value. In this way, for many commands, you
+ * can test it multiple times until it passes. Typically,
+ * if you can't get a valid command in two tests, the original
+ * command wasn't specified very well. */
+ ret = comedi_command_test(d_dev,&cmd);
+
+ if(ret<0)
+ bail ("comedi_command_test", comedi_errno());
+
+ ret = comedi_command_test(d_dev,&cmd);
+
+ if(ret<0)
+ bail ("comedi_command_test", comedi_errno());
+
+ /* start the command */
+ ret = comedi_command(d_dev,&cmd);
+
+ if(ret<0)
+ bail ("comedi_command", comedi_errno());
+
+ set_output_multiple (d_n_chan*sizeof(sampl_t));
+
+ assert(sizeof(sampl_t) == sizeof(short));
+ set_output_signature (gr_make_io_signature (1, 1, sizeof (sampl_t)));
+}
+
+bool
+comedi_sink_s::check_topology (int ninputs, int noutputs)
+{
+ if (ninputs > d_n_chan)
+ throw std::runtime_error ("comedi_sink_s");
+
+ return true;
+}
+
+comedi_sink_s::~comedi_sink_s ()
+{
+ if (d_map) {
+ munmap(d_map, d_buffer_size);
+ d_map = 0;
+ }
+
+ comedi_close(d_dev);
+}
+
+int
+comedi_sink_s::work (int noutput_items,
+ gr_vector_const_void_star &input_items,
+ gr_vector_void_star &output_items)
+{
+ int ret;
+
+ int work_left = noutput_items * sizeof(sampl_t) * d_n_chan;
+ sampl_t *pbuf = (sampl_t*)d_map;
+
+ do {
+
+ do {
+ ret = comedi_get_buffer_contents(d_dev,d_subdevice);
+ if (ret < 0)
+ bail ("comedi_get_buffer_contents", comedi_errno());
+
+ assert(ret % sizeof(sampl_t) == 0);
+ assert(work_left % sizeof(sampl_t) == 0);
+
+ ret = std::min(ret, work_left);
+ d_buf_front += ret;
+
+ assert(d_buffer_size%d_n_chan == 0);
+ if (d_buf_front-d_buf_back > (unsigned)d_buffer_size) {
+ d_buf_front+=d_buffer_size;
+ d_buf_back +=d_buffer_size;
+ }
+
+ if(d_buf_front==d_buf_back){
+ usleep(1000000*std::min(work_left,d_buffer_size/2)/(d_sampling_freq*sizeof(sampl_t)*d_n_chan));
+ continue;
+ }
+ } while (d_buf_front==d_buf_back);
+
+ for(unsigned i=d_buf_back/sizeof(sampl_t);i<d_buf_front/sizeof(sampl_t);i++){
+ int chan = i%d_n_chan;
+ int i_idx = noutput_items-work_left/d_n_chan/sizeof(sampl_t)+(i-d_buf_back/sizeof(sampl_t))/d_n_chan;
+
+ pbuf[i%(d_buffer_size/sizeof(sampl_t))] = input_items[chan]==0 ? 0 :
+ (int)((short*)(input_items[chan]))[i_idx] + 32767;
+ }
+
+ // FIXME: how to tell comedi the buffer is *written* ?
+ ret = comedi_mark_buffer_read(d_dev,d_subdevice,d_buf_front-d_buf_back);
+ if(ret<0)
+ bail ("comedi_mark_buffer_read", comedi_errno());
+
+ work_left -= d_buf_front-d_buf_back;
+
+ d_buf_back = d_buf_front;
+
+ } while(work_left>0);
+
+ return noutput_items;
+}
+
+
+void
+comedi_sink_s::output_error_msg (const char *msg, int err)
+{
+ fprintf (stderr, "comedi_sink_s[%s]: %s: %s\n",
+ d_device_name.c_str(), msg, comedi_strerror(err));
+}
+
+void
+comedi_sink_s::bail (const char *msg, int err) throw (std::runtime_error)
+{
+ output_error_msg (msg, err);
+ throw std::runtime_error ("comedi_sink_s");
+}
projects / debian / gnuradio / blobdiff