Feature/tune uart params (#264)

* Add tunable parameters for Windows
* Fix nrfutil in pipeline (Linux)

Author: kenr

.azure-pipelines/azure-pipelines.yml

@@ -213,7 +213,7 @@ jobs:
       sudo apt-get update
       sudo apt-get install ninja-build gcc-8 g++-8 clang-9 clang-format-9 clang-tidy-9 python3-pycurl python3-pip python3-certifi python3-setuptools libusb-1.0-0-dev libudev-dev
       /usr/bin/python3 -m pip install -U pip
-      /usr/bin/python3 -m pip install nrfutil
+      /usr/bin/python3 -m pip install --ignore-installed nrfutil
       chmod a+x $(System.ArtifactsDirectory)/nrftc
       $(System.ArtifactsDirectory)/nrftc install arm-toolchain -a $(Agent.BuildDirectory)/toolchain -i armgcc:${{ parameters.ARMGCC_VERSION }} -e $(Agent.BuildDirectory)/tcenv.sh
       cat $(Agent.BuildDirectory)/tcenv.sh

src/common/transport/uart_transport.cpp

@@ -61,6 +61,11 @@ constexpr auto DELAY_BEFORE_READ_WRITE = std::chrono::milliseconds(200);
 // if opening a UART port right after close.
 constexpr auto DELAY_BEFORE_OPEN = std::chrono::milliseconds(200);
 
+#if defined(_WIN32)
+// Wait for 20ms for data before returning from a read
+constexpr auto readTotalTimeoutConstant = 20;
+#endif
+
 struct UartTransport::impl : Transport
 {
     std::array<uint8_t, UartTransportBufferSize> readBuffer;
@@ -283,6 +288,26 @@ struct UartTransport::impl : Transport
             }
 #endif
 
+#if defined(_WIN32)
+            ::COMMTIMEOUTS timeouts;
+
+            // See
+            // https://docs.microsoft.com/en-us/windows/win32/api/winbase/ns-winbase-commtimeouts
+            // for documentation of these parameters
+            timeouts.ReadIntervalTimeout        = MAXDWORD;
+            timeouts.ReadTotalTimeoutMultiplier = MAXDWORD;
+            timeouts.ReadTotalTimeoutConstant   = readTotalTimeoutConstant;
+
+            timeouts.WriteTotalTimeoutMultiplier = 0;
+            timeouts.WriteTotalTimeoutConstant   = 0;
+
+            if (!::SetCommTimeouts(serialPort->native_handle(), &timeouts))
+            {
+                const auto error = std::error_code(errno, std::system_category());
+                throw std::system_error(error, "Failed to set communication timeout parameters");
+            }
+#endif
+
             // Wait a bit before making the device available since there are problems
             // if data is sent right after open.
             //