--- /dev/null
+/* -*- c++ -*- */
+/*
+ * Copyright 2009 Free Software Foundation, Inc.
+ *
+ * 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/>.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <usrp2/usrp2.h>
+#include <iostream>
+#include <cstdio>
+
+int
+main(int argc, char **argv)
+{
+ usrp2::usrp2::sptr u2 = usrp2::usrp2::make("eth0");
+
+ // Set io_tx[15] as FPGA output
+ u2->set_gpio_ddr(usrp2::GPIO_TX_BANK, 0x8000, 0x8000);
+
+ // Set io_tx[15] under host sofware control
+ u2->set_gpio_sels(usrp2::GPIO_TX_BANK, "s...............");
+
+ // Write pins
+ uint16_t v = 0x8765;
+ u2->write_gpio(usrp2::GPIO_TX_BANK, v, 0x8000);
+
+ // Read back
+ v = 0;
+ u2->read_gpio(usrp2::GPIO_TX_BANK, &v);
+ printf("TX GPIO read: %04X\n", v);
+ return 0;
+}