usrp3: Added new GPIO ATR 3000 core

- Refactored GPIO ATR definitions
- Added new 3000 core with a more efficient API
- Added a separate db_gpio_atr core to control the ATR bus
- Ported b2xx, e3xx and x3xx to the new core
- Minor cleanup

3 files changed, 75 insertions, 10 deletions

diff --git a/host/include/uhd/usrp/dboard_iface.hpp b/host/include/uhd/usrp/dboard_iface.hpp
index f8f318a40..c3a3a4e00 100644
--- a/host/include/uhd/usrp/dboard_iface.hpp
+++ b/host/include/uhd/usrp/dboard_iface.hpp
@@ -22,6 +22,7 @@
 #include <uhd/utils/pimpl.hpp>
 #include <uhd/types/serial.hpp>
 #include <uhd/types/time_spec.hpp>
+#include <uhd/usrp/gpio_defs.hpp>
 #include <boost/shared_ptr.hpp>
 #include <boost/cstdint.hpp>
 #include <string>
@@ -67,14 +68,6 @@ public:
         UNIT_TX = int('t')
     };
 
-    //! possible atr registers
-    enum atr_reg_t{
-        ATR_REG_IDLE        = int('i'),
-        ATR_REG_TX_ONLY     = int('t'),
-        ATR_REG_RX_ONLY     = int('r'),
-        ATR_REG_FULL_DUPLEX = int('f')
-    };
-
     //! aux dac selection enums (per unit)
     enum aux_dac_t{
         AUX_DAC_A = int('a'),
@@ -89,6 +82,8 @@ public:
         AUX_ADC_B = int('b')
     };
 
+    typedef uhd::usrp::gpio_atr::gpio_atr_reg_t atr_reg_t;
+
     /*!
      * Get special properties information for this dboard slot.
      * This call helps the dboard code to handle implementation
diff --git a/host/include/uhd/usrp/gpio_defs.hpp b/host/include/uhd/usrp/gpio_defs.hpp
new file mode 100644
index 000000000..c32f22f28
--- /dev/null
+++ b/host/include/uhd/usrp/gpio_defs.hpp
@@ -0,0 +1,70 @@
+//
+// Copyright 2011,2014,2015 Ettus Research LLC
+//
+// 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/>.
+//
+
+#ifndef INCLUDED_LIBUHD_USRP_GPIO_DEFS_HPP
+#define INCLUDED_LIBUHD_USRP_GPIO_DEFS_HPP
+
+#include <uhd/config.hpp>
+#include <boost/assign.hpp>
+#include <boost/utility.hpp>
+#include <map>
+
+namespace uhd { namespace usrp { namespace gpio_atr {
+
+enum gpio_atr_reg_t {
+    ATR_REG_IDLE        = int('i'),
+    ATR_REG_TX_ONLY     = int('t'),
+    ATR_REG_RX_ONLY     = int('r'),
+    ATR_REG_FULL_DUPLEX = int('f')
+};
+
+enum gpio_atr_mode_t {
+    MODE_ATR  = 0,   //Output driven by the auto-transmit-receive engine
+    MODE_GPIO = 1    //Output value is static
+};
+
+enum gpio_ddr_t {
+    DDR_INPUT   = 0,
+    DDR_OUTPUT  = 1
+};
+
+enum gpio_attr_t {
+    GPIO_CTRL,
+    GPIO_DDR,
+    GPIO_OUT,
+    GPIO_ATR_0X,
+    GPIO_ATR_RX,
+    GPIO_ATR_TX,
+    GPIO_ATR_XX
+};
+
+typedef std::map<gpio_attr_t, std::string> gpio_attr_map_t;
+
+static const gpio_attr_map_t gpio_attr_map =
+    boost::assign::map_list_of
+        (GPIO_CTRL,   "CTRL")
+        (GPIO_DDR,    "DDR")
+        (GPIO_OUT,    "OUT")
+        (GPIO_ATR_0X, "ATR_0X")
+        (GPIO_ATR_RX, "ATR_RX")
+        (GPIO_ATR_TX, "ATR_TX")
+        (GPIO_ATR_XX, "ATR_XX")
+;
+
+}}} //namespaces
+
+#endif /* INCLUDED_LIBUHD_USRP_GPIO_DEFS_HPP */
diff --git a/host/include/uhd/utils/soft_register.hpp b/host/include/uhd/utils/soft_register.hpp
index a2c34a4ec..665876e73 100644
--- a/host/include/uhd/utils/soft_register.hpp
+++ b/host/include/uhd/utils/soft_register.hpp
@@ -223,7 +223,7 @@ public:
                 _soft_copy.mark_clean();
             }
         } else {
-            throw uhd::not_implemented_error("soft_register is not writable.");
+            throw uhd::not_implemented_error("soft_register is not writable or uninitialized.");
         }
     }
 
@@ -244,7 +244,7 @@ public:
             }
             _soft_copy.mark_clean();
         } else {
-            throw uhd::not_implemented_error("soft_register is not readable.");
+            throw uhd::not_implemented_error("soft_register is not readable or uninitialized.");
         }
     }