Differences

This shows you the differences between two versions of the page.

--- code:sub2r-lib [2022/04/04 23:32] – external edit 127.0.0.1
+++ code:sub2r-lib [2022/08/30 18:42] – [byte_span] Igor Yefmov
@@ Line 1: / Line 1: @@
 ====== Windows ======
-You can download the library from [[http://download.sub2r.com/SUB2r-lib-2021-06-25.zip|this location]]. What you get in this package is:
+You can download the library from [[http://sub2r-download.com/SUB2r-lib-2022-08-22.zip|this location]]. What you get in this package is:
   - A header file ''FX3.h'' - the only include you need besides the standard headers
   - Both ''Release'' and ''Debug'' libraries with full symbol files (''.pdb'') and support for edit and continue (''.idb'' - currently only for ''Debug'' mode). These include the libraries from Cypress that this package depends on.
@@ Line 8: / Line 8: @@
   - Sample code for controlling FPS: ''sample3.cpp''
-The library is built using MSVC 2019 version ''16.10.1'' with Windows SDK ''10.0.19030.1000'' for use with ''UNICODE'' and ''multi-threaded'' CRT in ''64-bit'' and ''32-bit'' mode. The library requires a C++20 toolchain to be built.
+The library is built using MSVC 2022 version ''17.3.1'' with Windows SDK ''10.0.19041.0'' for use with ''UNICODE'' and ''multi-threaded'' CRT in ''64-bit'' and ''32-bit'' mode. The library requires a C++20 toolchain to be built.
-===== byte_span =====
+===== Basic "vendor request" call =====
-Beginning with version ''2018-09-05'' the code relies on [[https://github.com/Microsoft/GSL|Guidelines Support Library]] (GSL). Part of that change is to use ''gsl::span<std::byte>'' to represent raw byte buffers.
-Quite often a need arises to represent "simple" data types (like ''uint32_t'') as a byte buffer when using hardware API. To reduce the potential for stupid bugs and make code more readable it is recommended to use the provided <code c++>template<class T> gsl::span<std::byte> byte_span(T& _x) noexcept;</code> function when such a buffer's address is needed.
-All the library's methods were updated to conform to this calling convention.
 Sample usage:
@@ Line 21: / Line 16: @@
 using S2R::FX3;
 FX3 fx3; // by default opens device #0
-if(fx3){
+if(fx3.isValid()){
-    uint32_t vi{};
+    array<std::byte, 4> vi{};
     const auto rc{m_fx3.vrCmd(Fx3Cmd::fx3_version // vendor request command
                               , VrCmdOpType::read // read from device
                               , 0                 // "value"
                               , 0                 // "index"
-                              , byte_span(vi))};  // buffer to read into
+                              , vi)};             // buffer to read into
     return vi;                                    // 32 bits of the "version info" (4 bytes)
 }