On 8/28/07, Ronald Guida wrote:
I'm on a Windows box and I'm looking for a way to talk to a serial port (for example, RS-232) from Haskell. I couldn't find a library to do this, so I am wondering how to create one.
I figured out FFI and marshaling, and I got my serial port to work in Haskell. See http://ronguida.home.mindspring.com/ for a simple demonstration. To test this program, I connected my COM1 and COM2 ports with a null-modem cable and I used Hyperterminal to talk to COM2. The demo only does a few things: open a serial port, configure it, write to it, and read from it. I have some questions regarding this demonstration: 1. In the DCB and COMMTIMEOUTS datatypes and their marshaling code, is it better to convert Win32 datatypes to Haskell equivalents (e.g. DWORD to Int), like I did with DCB, or is it better to leave things in machine types like I did with COMMTIMEOUTS (e.g. DWORD to Word32) ? 2. Can anyone tell me whether I am making proper use of unsafeInterleaveIO in my implementation of getContentsSerialPort? I am interested in creating a library for serial ports under Win32, and I'm wondering, how should I proceed? -- Ron