diff options
Diffstat (limited to 'usrp/host/lib/usrp_basic_libusb1.cc')
| -rw-r--r-- | usrp/host/lib/usrp_basic_libusb1.cc | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/usrp/host/lib/usrp_basic_libusb1.cc b/usrp/host/lib/usrp_basic_libusb1.cc new file mode 100644 index 000000000..6c22b5c6f --- /dev/null +++ b/usrp/host/lib/usrp_basic_libusb1.cc @@ -0,0 +1,152 @@ +/* -*- c++ -*- */ +/* + * Copyright 2003,2004,2008,2009 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 <usrp/usrp_basic.h> +#include "usrp/usrp_prims.h" +#include "usrp_interfaces.h" +#include "fpga_regs_common.h" +#include "fpga_regs_standard.h" +#include "fusb.h" +#include "db_boards.h" +#include <libusb-1.0/libusb.h> +#include <stdexcept> +#include <assert.h> +#include <math.h> +#include <ad9862.h> +#include <string.h> +#include <cstdio> + + +using namespace ad9862; + +#define NELEM(x) (sizeof (x) / sizeof (x[0])) + +// These set the buffer size used for each end point using the fast +// usb interface. The kernel ends up locking down this much memory. + +static const int FUSB_BUFFER_SIZE = fusb_sysconfig::default_buffer_size(); +static const int FUSB_BLOCK_SIZE = fusb_sysconfig::max_block_size(); +static const int FUSB_NBLOCKS = FUSB_BUFFER_SIZE / FUSB_BLOCK_SIZE; + + +static const double POLLING_INTERVAL = 0.1; // seconds + + +////////////////////////////////////////////////////////////////// +// +// usrp_basic +// +//////////////////////////////////////////////////////////////// + + +// Given: +// CLKIN = 64 MHz +// CLKSEL pin = high +// +// These settings give us: +// CLKOUT1 = CLKIN = 64 MHz +// CLKOUT2 = CLKIN = 64 MHz +// ADC is clocked at 64 MHz +// DAC is clocked at 128 MHz + +static unsigned char common_regs[] = { + REG_GENERAL, 0, + REG_DLL, (DLL_DISABLE_INTERNAL_XTAL_OSC + | DLL_MULT_2X + | DLL_FAST), + REG_CLKOUT, CLKOUT2_EQ_DLL_OVER_2, + REG_AUX_ADC_CLK, AUX_ADC_CLK_CLK_OVER_4 +}; + +usrp_basic::usrp_basic (int which_board, + struct libusb_device_handle * + open_interface (struct libusb_device *dev), + const std::string fpga_filename, + const std::string firmware_filename) + : d_udh (0), d_ctx (0), + d_usb_data_rate (16000000), // SWAG, see below + d_bytes_per_poll ((int) (POLLING_INTERVAL * d_usb_data_rate)), + d_verbose (false), d_fpga_master_clock_freq(64000000), d_db(2) +{ + /* + * SWAG: Scientific Wild Ass Guess. + * + * d_usb_data_rate is used only to determine how often to poll for over- and under-runs. + * We defualt it to 1/2 of our best case. Classes derived from usrp_basic (e.g., + * usrp_standard_tx and usrp_standard_rx) call set_usb_data_rate() to tell us the + * actual rate. This doesn't change our throughput, that's determined by the signal + * processing code in the FPGA (which we know nothing about), and the system limits + * determined by libusb, fusb_*, and the underlying drivers. + */ + memset (d_fpga_shadows, 0, sizeof (d_fpga_shadows)); + + d_ctx = usrp_one_time_init(true); + + if (!usrp_load_standard_bits (which_board, false, fpga_filename, firmware_filename, d_ctx)) + throw std::runtime_error ("usrp_basic/usrp_load_standard_bits"); + + struct libusb_device *dev = usrp_find_device (which_board, false, d_ctx); + if (dev == 0){ + fprintf (stderr, "usrp_basic: can't find usrp[%d]\n", which_board); + throw std::runtime_error ("usrp_basic/usrp_find_device"); + } + + if (!(usrp_usrp_p(dev) && usrp_hw_rev(dev) >= 1)){ + fprintf (stderr, "usrp_basic: sorry, this code only works with USRP revs >= 1\n"); + throw std::runtime_error ("usrp_basic/bad_rev"); + } + + if ((d_udh = open_interface (dev)) == 0) + throw std::runtime_error ("usrp_basic/open_interface"); + + // initialize registers that are common to rx and tx + + if (!usrp_9862_write_many_all (d_udh, common_regs, sizeof (common_regs))){ + fprintf (stderr, "usrp_basic: failed to init common AD9862 regs\n"); + throw std::runtime_error ("usrp_basic/init_9862"); + } + + _write_fpga_reg (FR_MODE, 0); // ensure we're in normal mode + _write_fpga_reg (FR_DEBUG_EN, 0); // disable debug outputs + +} + +usrp_basic::~usrp_basic () +{ + // shutdown_daughterboards(); // call from ~usrp_basic_{tx,rx} + + d_db.resize(0); // forget db shared ptrs + + if (d_udh) + libusb_close (d_udh); + + // Each object should be running in it's own context. If running in default + // (NULL) context then something went wrong. + + assert (d_ctx != NULL); + libusb_exit (d_ctx); +} + |