From 727d8711f94bf7fe634fc33659b77bc4b4884d9c Mon Sep 17 00:00:00 2001
From: Nick Foster <nick@nerdnetworks.org>
Date: Fri, 13 Aug 2010 16:16:22 -0700
Subject: Support for NMEA reads. Uses NMEA parsing instead of Jackson Labs
 parsing.

No multibaud support yet. read/write_uart() now do multiple-packet writes in multiples of 20 bytes (hardcoded).
---
 host/lib/usrp/usrp2/usrp2_iface.cpp | 29 +++++++++++++++++++++--------
 1 file changed, 21 insertions(+), 8 deletions(-)

(limited to 'host/lib/usrp/usrp2/usrp2_iface.cpp')

diff --git a/host/lib/usrp/usrp2/usrp2_iface.cpp b/host/lib/usrp/usrp2/usrp2_iface.cpp
index f4d354204..0771c4945 100644
--- a/host/lib/usrp/usrp2/usrp2_iface.cpp
+++ b/host/lib/usrp/usrp2/usrp2_iface.cpp
@@ -24,6 +24,7 @@
 #include <boost/asio.hpp> //used for htonl and ntohl
 #include <boost/assign/list_of.hpp>
 #include <boost/format.hpp>
+#include <boost/tokenizer.hpp>
 #include <stdexcept>
 #include <algorithm>
 
@@ -176,40 +177,52 @@ public:
  * UART
  **********************************************************************/
     void write_uart(boost::uint8_t dev, const std::string &buf){
+      //first tokenize the string into 20-byte substrings
+      boost::offset_separator f(20, 1, true, true);
+      boost::tokenizer<boost::offset_separator> tok(buf, f);
+      std::vector<std::string> queue(tok.begin(), tok.end());
+
+      BOOST_FOREACH(std::string item, queue) {
         //setup the out data
         usrp2_ctrl_data_t out_data;
         out_data.id = htonl(USRP2_CTRL_ID_HEY_WRITE_THIS_UART_FOR_ME_BRO);
         out_data.data.uart_args.dev = dev;
-        out_data.data.uart_args.bytes = buf.size();
+        out_data.data.uart_args.bytes = item.size();
 
         //limitation of uart transaction size
-        UHD_ASSERT_THROW(buf.size() <= sizeof(out_data.data.uart_args.data));
+        UHD_ASSERT_THROW(item.size() <= sizeof(out_data.data.uart_args.data));
 
         //copy in the data
-        std::copy(buf.begin(), buf.end(), out_data.data.uart_args.data);
+        std::copy(item.begin(), item.end(), out_data.data.uart_args.data);
 
         //send and recv
         usrp2_ctrl_data_t in_data = this->ctrl_send_and_recv(out_data);
         UHD_ASSERT_THROW(ntohl(in_data.id) == USRP2_CTRL_ID_MAN_I_TOTALLY_WROTE_THAT_UART_DUDE);
+      }
     }
 
-    std::string read_uart(boost::uint8_t dev, size_t num_bytes){
+    std::string read_uart(boost::uint8_t dev){
+    	int readlen = 20;
+      std::string result;
+    	while(readlen == 20) { //while we keep receiving full packets
         //setup the out data
         usrp2_ctrl_data_t out_data;
         out_data.id = htonl(USRP2_CTRL_ID_SO_LIKE_CAN_YOU_READ_THIS_UART_BRO);
         out_data.data.uart_args.dev = dev;
-        out_data.data.uart_args.bytes = num_bytes;
+        out_data.data.uart_args.bytes = 20;
 
         //limitation of uart transaction size
-        UHD_ASSERT_THROW(num_bytes <= sizeof(out_data.data.uart_args.data));
+        //UHD_ASSERT_THROW(num_bytes <= sizeof(out_data.data.uart_args.data));
 
         //send and recv
         usrp2_ctrl_data_t in_data = this->ctrl_send_and_recv(out_data);
         UHD_ASSERT_THROW(ntohl(in_data.id) == USRP2_CTRL_ID_I_HELLA_READ_THAT_UART_DUDE);
+        readlen = in_data.data.uart_args.bytes;
 
         //copy out the data
-        std::string result((const char *)in_data.data.uart_args.data, (size_t)in_data.data.uart_args.bytes);
-        return result;
+        result += std::string((const char *)in_data.data.uart_args.data, (size_t)readlen);
+      }
+      return result;
     }
 
 /***********************************************************************
-- 
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