{"id":451,"date":"2010-12-21T20:49:20","date_gmt":"2010-12-21T20:49:20","guid":{"rendered":"https:\/\/ibex.tech\/visualcpp\/?p=451"},"modified":"2022-02-17T06:24:04","modified_gmt":"2022-02-17T06:24:04","slug":"serial-port","status":"publish","type":"post","link":"https:\/\/ibex.tech\/visualcpp\/serial-port\/serial-port","title":{"rendered":"Serial Port"},"content":{"rendered":"
\r\n\r\nusing namespace System::IO::Ports;\r\n<\/code><\/pre>\n
\nTo Discover Available Comm Ports On The PC
\n<\/h4>\n
\r\n\r\n\t array<String^> ^AvailableSerialPorts;\r\n\t array<unsigned char> ^aTemp;\r\n\t String ^sTemp;\r\n\r\n\t try\r\n\t {\r\n\t\tAvailableSerialPorts = SerialPort::GetPortNames();\r\n\r\n\t\tcmbCommPort->Items->Add("None");\r\n\t\tfor(int Count = 0; Count < AvailableSerialPorts->Length; Count++)\r\n\t\t{\r\n\t\t\tsTemp = AvailableSerialPorts[Count];\r\n\r\n\t\t\t\/\/Remove any non numeric last letter which can be added by microsoft bluetooth drivers\r\n\t\t\taTemp = System::Text::Encoding::UTF8->GetBytes(sTemp);\r\n\t\t\twhile (\r\n\t\t\t\t(aTemp->Length > 1) && \r\n\t\t\t\t((aTemp[(aTemp->Length - 1)] < '0') || (aTemp[(aTemp->Length - 1)] > '9'))\r\n\t\t\t\t)\r\n\t\t\t{\r\n\t\t\t\tArray::Resize(aTemp, (aTemp->Length - 1));\r\n\t\t\t}\r\n\t\t\tsTemp = System::Text::Encoding::UTF8->GetString(aTemp);\r\n\r\n\t\t\tcmbCommPort->Items->Add(sTemp);\r\n\t\t}\r\n\t\tcmbCommPort->SelectedIndex = 0;\r\n\t }\r\n\t catch(System::Exception^ e)\r\n\t {\r\n\t }\r\n<\/code><\/pre>\n
\nTo use a simple form based SerialPort
\n<\/h4>\n
\n(This is no use if you want to use in a seperate class!)
\nPlace the serialport from the tool box onto the form (not the old Comm control that used to be used in VB).
\nYou can set its properties by selecting it and using the properties box
\nTo create a new event, such as datareceived press the lightning bolt 'events' icon in the properties box and double click the event you want to create.\n<\/p>\n
\nTo create a serial port in a class
\n<\/h4>\n
\nIn the class private declarations area
\n<\/h5>\n
\r\n\r\n\tSystem::IO::Ports::SerialPort ^serialPort1;\r\n<\/code><\/pre>\n
\nIn the class constructor function
\n<\/h5>\n
\r\n\r\n\tserialPort1 = gcnew System::IO::Ports::SerialPort();\r\n\tserialPort1->BaudRate = 19200;\r\n\tserialPort1->DataBits = 8;\r\n\tserialPort1->Parity = Parity::None;\r\n\tserialPort1->StopBits = StopBits::One;\r\n\tserialPort1->Handshake = Handshake::None;\r\n\r\n\tserialPort1->DataReceived += gcnew System::IO::Ports::SerialDataReceivedEventHandler(this, &MyClass::serialPort1_DataReceived);\r\n<\/code><\/pre>\n
\nIn a function that wants to set the port number and open it
\n<\/h5>\n
\r\n\r\n\ttry\r\n\t{\r\n\t\tserialPort1->PortName = "COM" + CommPort;\r\n\t\tif (serialPort1->IsOpen)\t\t\t\/\/Port should not already be open\r\n\t\t\treturn(0);\r\n\t\tserialPort1->Open();\t\t\t\/\/Try and open it\r\n\t\treturn(1);\t\t\t\t\t\/\/Sucess\r\n\t}\r\n\tcatch (Exception^ e)\r\n\t{\r\n\t\treturn(0);\r\n\t}\r\n<\/code><\/pre>\n
\nIn a function that wants to send data
\n<\/h5>\n
\r\n\r\n\tserialPort1->Write("SCIP2.0\\n");\r\n\t\/\/or\r\n\tString ^buffer;\r\n\tbuffer = "BM\\n";\r\n\tserialPort1->Write(buffer);\r\n<\/code><\/pre>\n
\nFunction to receive
\n<\/h5>\n
\r\n\r\n\tvoid MyClass::serialPort1_DataReceived(System::Object^  sender, System::IO::Ports::SerialDataReceivedEventArgs^  e)\r\n\t{\r\n\t\tint RxBytes;\r\n\t\tint rxByte;\r\n\r\n\t\tRxBytes = serialPort1->BytesToRead;\r\n\r\n\t\t\/\/----- GET WAITING BYTES -----\r\n\t\twhile (RxBytes--)\r\n\t\t{\r\n\t\t\trxByte = serialPort1->ReadByte();\r\n\r\n\t\t}\r\n<\/code><\/pre>\n
\nThreading On DataReceived<\/span>
\n<\/h4>\n
\nThe DataReceived event will not necessarily occur on the same thread as your form UI so you need to use a thread safe call to a new function if you want to update form components in response to data being received.<\/span>\n<\/p>\n
\nIssue where the _DataReceived event might occasionally not get triggered
\n<\/h4>\n
\nSee http:\/\/www.codeproject.com\/KB\/dotnet\/NET_20_SerialPort.aspx?msg=2729827#xx2729827xx\n<\/p>\n
\nOne fix is to add this into the waiting for response loop\n<\/p>\n
\r\n\r\n\tSystem::Windows::Forms::Application::DoEvents();\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
using namespace System::IO::Ports; To Discover Available Comm Ports On The PC array<String^> ^AvailableSerialPorts; array<unsigned char> ^aTemp; String ^sTemp; try { AvailableSerialPorts = SerialPort::GetPortNames(); cmbCommPort->Items->Add("None"); for(int Count = 0; Count < AvailableSerialPorts->Length; Count++) { sTemp = AvailableSerialPorts[Count]; \/\/Remove any non numeric last letter which can be added by microsoft bluetooth drivers aTemp = System::Text::Encoding::UTF8->GetBytes(sTemp); while ( […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[57],"tags":[],"class_list":["post-451","post","type-post","status-publish","format-standard","hentry","category-serial-port"],"_links":{"self":[{"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/posts\/451","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/comments?post=451"}],"version-history":[{"count":7,"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/posts\/451\/revisions"}],"predecessor-version":[{"id":1078,"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/posts\/451\/revisions\/1078"}],"wp:attachment":[{"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/media?parent=451"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/categories?post=451"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ibex.tech\/visualcpp\/wp-json\/wp\/v2\/tags?post=451"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}