Replaced the vrt pack and unpack with a pack and unpack for big endian and a pack and unpack for little endian.

The vrt handler code was templatized to take the relevant packer/unpacker as an argument.

1 files changed, 47 insertions, 27 deletions

diff --git a/host/lib/transport/gen_vrt.py b/host/lib/transport/gen_vrt.py
index c34ffb198..1417240ab 100755
--- a/host/lib/transport/gen_vrt.py
+++ b/host/lib/transport/gen_vrt.py
@@ -27,28 +27,42 @@ The generated code infers jump tables to speed-up the parsing time.
 
 TMPL_TEXT = """
 #import time
-
-########################################################################
-## setup predicates
-########################################################################
-#set $sid_p = 0b00001
-#set $cid_p = 0b00010
-#set $tsi_p = 0b00100
-#set $tsf_p = 0b01000
-#set $tlr_p = 0b10000
-
 /***********************************************************************
  * This file was generated by $file on $time.strftime("%c")
  **********************************************************************/
 
 \#include <uhd/transport/vrt.hpp>
-\#include <boost/asio.hpp> //endianness conversion
+\#include <uhd/utils/byteswap.hpp>
 \#include <stdexcept>
 
+//define the endian macros to convert integers
+\#ifdef HAVE_BIG_ENDIAN
+    \#define BE_MACRO(x) (x)
+    \#define LE_MACRO(x) uhd::byteswap(x)
+\#else
+    \#define BE_MACRO(x) uhd::byteswap(x)
+    \#define LE_MACRO(x) (x)
+\#endif
+
+#set $XE_MACRO = "BE_MACRO"
+
 using namespace uhd;
 using namespace uhd::transport;
 
-void vrt::pack(
+########################################################################
+#def gen_code($XE_MACRO, $suffix)
+########################################################################
+
+########################################################################
+## setup predicates
+########################################################################
+#set $sid_p = 0b00001
+#set $cid_p = 0b00010
+#set $tsi_p = 0b00100
+#set $tsf_p = 0b01000
+#set $tlr_p = 0b10000
+
+void vrt::pack_$(suffix)(
     const tx_metadata_t &metadata, //input
     boost::uint32_t *header_buff,  //output
     size_t &num_header_words32,    //output
@@ -70,29 +84,29 @@ void vrt::pack(
         #set $flags = 0
         ########## Stream ID ##########
         #if $pred & $sid_p
-            header_buff[$num_header_words] = htonl(metadata.stream_id);
+            header_buff[$num_header_words] = $(XE_MACRO)(metadata.stream_id);
             #set $num_header_words += 1
             #set $flags |= (0x1 << 28);
         #end if
         ########## Class ID ##########
         #if $pred & $cid_p
-            header_buff[$num_header_words] = htonl(0);
+            header_buff[$num_header_words] = 0;
             #set $num_header_words += 1
-            header_buff[$num_header_words] = htonl(0);
+            header_buff[$num_header_words] = 0;
             #set $num_header_words += 1
             #set $flags |= (0x1 << 27);
         #end if
         ########## Integer Time ##########
         #if $pred & $tsi_p
-            header_buff[$num_header_words] = htonl(metadata.time_spec.secs);
+            header_buff[$num_header_words] = $(XE_MACRO)(metadata.time_spec.secs);
             #set $num_header_words += 1
             #set $flags |= (0x3 << 22);
         #end if
         ########## Fractional Time ##########
         #if $pred & $tsf_p
-            header_buff[$num_header_words] = htonl(0);
+            header_buff[$num_header_words] = 0;
             #set $num_header_words += 1
-            header_buff[$num_header_words] = htonl(metadata.time_spec.get_ticks(tick_rate));
+            header_buff[$num_header_words] = $(XE_MACRO)(metadata.time_spec.get_ticks(tick_rate));
             #set $num_header_words += 1
             #set $flags |= (0x1 << 20);
         #end if
@@ -116,13 +130,13 @@ void vrt::pack(
     if (metadata.end_of_burst)   vrt_hdr_flags |= $hex(0x1 << 24);
 
     //fill in complete header word
-    header_buff[0] = htonl(vrt_hdr_flags |
+    header_buff[0] = $(XE_MACRO)(vrt_hdr_flags |
         ((packet_count & 0xf) << 16) |
         (num_packet_words32 & 0xffff)
     );
 }
 
-void vrt::unpack(
+void vrt::unpack_$(suffix)(
     rx_metadata_t &metadata,            //output
     const boost::uint32_t *header_buff, //input
     size_t &num_header_words32,         //output
@@ -135,7 +149,7 @@ void vrt::unpack(
     metadata = rx_metadata_t();
 
     //extract vrt header
-    boost::uint32_t vrt_hdr_word = ntohl(header_buff[0]);
+    boost::uint32_t vrt_hdr_word = $(XE_MACRO)(header_buff[0]);
     size_t packet_words32 = vrt_hdr_word & 0xffff;
     packet_count = (vrt_hdr_word >> 16) & 0xf;
 
@@ -160,7 +174,7 @@ void vrt::unpack(
         ########## Stream ID ##########
         #if $pred & $sid_p
             metadata.has_stream_id = true;
-            metadata.stream_id = ntohl(header_buff[$num_header_words]);
+            metadata.stream_id = $(XE_MACRO)(header_buff[$num_header_words]);
             #set $num_header_words += 1
         #end if
         ########## Class ID ##########
@@ -172,7 +186,7 @@ void vrt::unpack(
         #if $pred & $tsi_p
             metadata.has_time_spec = true;
             #set $set_has_time_spec = True
-            metadata.time_spec.secs = ntohl(header_buff[$num_header_words]);
+            metadata.time_spec.secs = $(XE_MACRO)(header_buff[$num_header_words]);
             #set $num_header_words += 1
         #end if
         ########## Fractional Time ##########
@@ -182,7 +196,7 @@ void vrt::unpack(
                 #set $set_has_time_spec = True
             #end if
             #set $num_header_words += 1
-            metadata.time_spec.set_ticks(ntohl(header_buff[$num_header_words]), tick_rate);
+            metadata.time_spec.set_ticks($(XE_MACRO)(header_buff[$num_header_words]), tick_rate);
             #set $num_header_words += 1
         #end if
         ########## Trailer ##########
@@ -198,13 +212,19 @@ void vrt::unpack(
     #end for
     }
 }
-"""
 
-import sys
+########################################################################
+#end def
+########################################################################
+
+$gen_code("BE_MACRO", "be")
+$gen_code("LE_MACRO", "le")
+"""
 
-from Cheetah.Template import Template
 def parse_tmpl(_tmpl_text, **kwargs):
+    from Cheetah.Template import Template
     return str(Template(_tmpl_text, kwargs))
 
 if __name__ == '__main__':
+    import sys
     open(sys.argv[1], 'w').write(parse_tmpl(TMPL_TEXT, file=__file__))