| Hi, Jason. Thank you for your explanations. They were very useful. In the light of what you said, I modified the programs as shown below (commented lines failed to work). Forcing the C function to return a number, wrapping the returned number in IO, and printing the number, I succeeded in bringing falures down to 1 case in 20 trials (average). By the way, I talked to doctors who work with capnograms, and they said that all Windows or Linux machines have problems in closing communication ports. However, it seems that capnographs are not turned off very often. I mean, when the doctor move the capnograph from one patient to another, s/he turns off the instrument. Therefore, this behavior does not create problems. However, what bothers me is that Clean always succeds in closeing the port. {-# LANGUAGE ForeignFunctionInterface #-} {- file: SER/IAL.hs -} module SER.IAL where import Control.Monad import Foreign import Foreign.C.Types import Foreign.C foreign import ccall "rs232.h opencport" opencport :: CInt -> IO () -- foreign import ccall "rs232.h closecport" closecport :: CInt -> CInt -- foreign import stdcall unsafe "rs232.h closecport" closecport :: IO () -- foreign import ccall unsafe "rs232.h closecport" c_closecport :: CInt foreign import ccall unsafe "rs232.h closecport" c_closecport :: CInt -> CInt closecport :: Int -> IO Int closecport n= return (fromIntegral (c_closecport (fromIntegral n))) foreign import ccall "rs232.h rdrs232" c_sendmsg :: CInt -> CString -> CString sendMessage :: Int -> String -> IO String sendMessage n msg = withCString msg $ \str -> peekCString (c_sendmsg (fromIntegral n) str) {- file: sensors.hs -} import Gui.Binding import Gui.Types import Gui.Constants import SER.IAL import Control.Monad import Data.Char main = do rv <- j_start frame <- j_frame "Sensors" avg <- j_button frame "Sampling" j_setpos avg 20 150 j_setsize avg 90 30 rb <- j_button frame "Read" j_setpos rb 125 150 j_setsize rb 90 30 tb <- j_button frame "Acquisition" j_setpos tb 230 150 j_setsize tb 90 30 fld <- j_textfield frame 40 j_setpos fld 20 100 menubar <- j_menubar frame file <- j_menu menubar "File" quitMI <- j_menuitem file "Quit" j_show frame opencport(3) waitForFrameAction frame fld rb tb avg quitMI r <- closecport 5 putStrLn (show r) return j_quit waitForFrameAction frame f rb tb avg q = do obj <- j_nextaction again <- if obj == event q then return False else if obj == event rb then (do msg <- sendMessage 1 "r" putStrLn msg return True) else if obj == event tb then (do tx <- sendMessage 1 "t" let tp= filter (> ' ') tx j_settext f tp return True) else if obj == event avg then (do ok <- sendMessage 1 "m" val <- j_gettext f 300 ns <- sendMessage 2 val putStrLn ((filter (> ' ') ok) ++ ns) return True) else (do tx <- sendMessage 1 "t" let tp= filter (> ' ') tx rx <- sendMessage 1 "x" let rd= filter (> ' ') rx let x = hex2dec rd let tt= (fromIntegral x)*209.1/1023.0 - 67.23 j_settext f ((show tt)++" ==> "++tp) return True) if not again then return True else waitForFrameAction frame f rb tb avg q hex2dec :: String -> Int hex2dec h= sum (zipWith (*) (map (16^) [3,2,1,0]) [digitToInt c | c <- h]) convert d r s0= (fromIntegral (hex2dec d))*r/1024.0- s0 {- 1a43 67.23; 082b - 209.1 -} // file: serial.c #include "serial.h" #include <string.h> #include <stdio.h> /* Possible baudrates on a normal pc: 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, 9600, 19200, 38400, 57600, 115200 */ #define BAUD "baud=9600 data=8 parity=N stop=1" HANDLE Cport; char comports[16][10]={"\\\\.\\COM1", "\\\\.\\COM2", "\\\\.\\COM3", "\\\\.\\COM4", "\\\\.\\COM5", "\\\\.\\COM6", "\\\\.\\COM7", "\\\\.\\COM8", "\\\\.\\COM9", "\\\\.\\COM10", "\\\\.\\COM11", "\\\\.\\COM12", "\\\\.\\COM13", "\\\\.\\COM14", "\\\\.\\COM15", "\\\\.\\COM16"}; int OpenComport(int comport_number) { if(comport_number>15) { printf("illegal comport number\n"); return(1); } Cport = CreateFileA(comports[comport_number], GENERIC_READ|GENERIC_WRITE, 0, /* no share */ NULL, /* no security */ OPEN_EXISTING, 0, /* no threads */ NULL); /* no templates */ if(Cport==INVALID_HANDLE_VALUE) { printf("unable to open comport\n"); return(1); } DCB port_settings; memset(&port_settings, 0, sizeof(port_settings)); /* clear the new struct */ port_settings.DCBlength = sizeof(port_settings); if(!BuildCommDCBA(BAUD, &port_settings)) { printf("unable to set comport dcb settings\n"); CloseHandle(Cport); return(1); } if(!SetCommState(Cport, &port_settings)) { printf("unable to set comport cfg settings\n"); CloseHandle(Cport); return(1); } COMMTIMEOUTS Cptimeouts; Cptimeouts.ReadIntervalTimeout = MAXDWORD; Cptimeouts.ReadTotalTimeoutMultiplier = 10; Cptimeouts.ReadTotalTimeoutConstant = 10; Cptimeouts.WriteTotalTimeoutMultiplier = 10; Cptimeouts.WriteTotalTimeoutConstant = 10; if(!SetCommTimeouts(Cport, &Cptimeouts)) { printf("unable to set comport time-out settings\n"); CloseHandle(Cport); return(1); } return(0); } int PollComport(unsigned char *buf, int size) { int n; if(size>4096) size = 4096; /* added the void pointer cast, otherwise gcc will complain about */ /* "warning: dereferencing type-punned pointer will break strict aliasing rules" */ ReadFile(Cport, buf, size, (LPDWORD)((void *)&n), NULL); return(n); } int RdByte(unsigned char* m) { int n; ReadFile(Cport, m, 1, (LPDWORD)((void *)&n), NULL); return(n); } int SendByte(unsigned char byte) { int n; WriteFile(Cport, &byte, 1, (LPDWORD)((void *)&n), NULL); if(n<0) return(1); return(0); } int SendBuf(unsigned char *buf, int size) { int n; if(WriteFile(Cport, buf, size, (LPDWORD)((void *)&n), NULL)) { return(n); } return(-1); } int CloseComport(void) { CloseHandle(Cport); return(0); } int IsCTSEnabled(void) { int status; GetCommModemStatus(Cport, (LPDWORD)((void *)&status)); if(status&MS_CTS_ON) return(1); else return(0); } int cprintf(const char *text) /* sends a string to serial port */ { while(*text != 0) SendByte(*(text++)); return(0); } int opencport(int p) { OpenComport(p-1); return 3; } int closecport(int n) { CloseHandle(Cport); printf("Bye\n"); return n; } char* rdrs232(int n, char* msg) { char *str; char mm; int i, j; for (j=0; j<n; j++) { SendByte(msg[j]); } str = (char *) malloc(16000); i=0; mm=0; while (mm != 10) { RdByte(&mm); str[i]= mm; i= i+1; } if (i>0 && str[0]==0) { str[0]= ' ';} return(str); } //file: serial.h #ifndef rs232_INCLUDED #define rs232_INCLUDED #ifdef __cplusplus extern "C" { #endif #include <stdio.h> #include <string.h> #ifdef __linux__ #include <termios.h> #include <sys/ioctl.h> #include <unistd.h> #include <fcntl.h> #include <sys/types.h> #include <sys/stat.h> #include <limits.h> #else #include <windows.h> #endif int OpenComport(int); int PollComport(unsigned char *, int); int SendByte(unsigned char); int SendBuf(unsigned char *, int); int CloseComport(void); int cprintf(const char *); int IsCTSEnabled(void); char *topa(int n); int opencport(int p); int closecport(int n); char* rdrs232(int n, char* msg); #ifdef __cplusplus } /* extern "C" */ #endif #endif --- On Tue, 11/10/09, Jason Dusek <jason.dusek@gmail.com> wrote:
|