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| #include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#define BUF_SIZE 65536
#define PURGE_ALL PURGE_RXABORT|PURGE_TXABORT|PURGE_RXCLEAR|PURGE_TXCLEAR
//#define COMM_EVENTS EV_RXFLAG
#define COMM_EVENTS EV_BREAK | EV_CTS | EV_DSR | EV_ERR | EV_EVENT1 | EV_EVENT2 | EV_PERR | EV_RING | EV_RLSD | EV_RX80FULL | EV_RXCHAR | EV_RXFLAG | EV_TXEMPTY
unsigned long
com_get(HANDLE *dev, char *buf, size_t len) {
OVERLAPPED io_ov;
unsigned long ret = 0;
int err;
memset(&io_ov, 0, sizeof(io_ov));
io_ov.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (!ReadFile(*dev, buf, len, NULL, &io_ov)) {
err = GetLastError();
if (err != ERROR_IO_PENDING) {
fprintf(stderr,"readfile failed %d\n", err);
} else if (!GetOverlappedResult(dev, &io_ov, &ret, TRUE)) {
fprintf(stderr,"overlapped read failed %d\n", GetLastError());
}
}
CloseHandle(io_ov.hEvent);
return ret;
}
int
com_nbytes(HANDLE *dev) {
COMSTAT status;
ClearCommError(*dev, NULL, &status);
return status.cbInQue;
}
int
main (void) {
COMMTIMEOUTS cto;
DCB dcb;
HANDLE dev;
OVERLAPPED ev_ov;
char buf[BUF_SIZE];
int nbytes, rate;
const char *port;
unsigned long ev;
port= "COM2";
rate = 9600;
dev = CreateFile(port,
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
FILE_FLAG_OVERLAPPED,
NULL);
memset(&ev_ov, 0, sizeof(ev_ov));
ev_ov.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
GetCommState(dev, &dcb);
dcb.DCBlength = sizeof(DCB);
dcb.Parity = NOPARITY;
dcb.fParity = FALSE;
dcb.BaudRate = rate;
dcb.ByteSize = 8;
dcb.fOutX = 0;
dcb.fInX = 0;
dcb.fOutxCtsFlow = 0;
dcb.fRtsControl = 0;
dcb.fDtrControl = 0;
dcb.fOutxDsrFlow = 0;
dcb.fDsrSensitivity = 0;
dcb.EvtChar = 'a';
dcb.EofChar = '\0';
GetCommTimeouts(dev, &cto);
cto.ReadIntervalTimeout = 400;
cto.ReadTotalTimeoutMultiplier = 200;
cto.ReadTotalTimeoutConstant = 2000;
cto.WriteTotalTimeoutMultiplier = 200;
cto.WriteTotalTimeoutConstant = 2000;
PurgeComm(dev, PURGE_ALL);
SetCommTimeouts(dev, &cto);
SetCommState(dev,&dcb);
SetCommMask(dev, COMM_EVENTS);
while(1) {
if (!WaitCommEvent(dev, &ev, &ev_ov)) {
if (GetLastError() != ERROR_IO_PENDING) {
fprintf(stderr, "WaitCommEvent(): GetLastError() != ERROR_IO_PENDING\n");
break;
}
}
switch (WaitForSingleObject(ev_ov.hEvent, INFINITE)) {
case WAIT_OBJECT_0:
if (ev & EV_BREAK)
fprintf(stderr, "Recv EV_BREAK\n");
if (ev & EV_CTS)
fprintf(stderr, "Recv EV_CTS\n");
if (ev & EV_DSR)
fprintf(stderr, "Recv EV_DSR\n");
if (ev & EV_ERR)
fprintf(stderr, "Recv EV_ERR\n");
if (ev & EV_EVENT1)
fprintf(stderr, "Recv EV_EVENT1\n");
if (ev & EV_EVENT2)
fprintf(stderr, "Recv EV_EVENT2\n");
if (ev & EV_PERR)
fprintf(stderr, "Recv EV_PERR\n");
if (ev & EV_RING)
fprintf(stderr, "Recv EV_RING\n");
if (ev & EV_RLSD)
fprintf(stderr, "Recv EV_RLSD\n");
if (ev & EV_RX80FULL)
fprintf(stderr, "Recv EV_RX80FULL\n");
if (ev & EV_RXCHAR)
fprintf(stderr, "Recv EV_RXCHAR\n");
if (ev & EV_RXFLAG)
fprintf(stderr, "Recv EV_RXFLAG\n");
if (ev & EV_TXEMPTY)
fprintf(stderr, "Recv EV_TXEMPTY\n");
nbytes = com_nbytes(&dev);
memset(buf, '\0', 1024);
com_get(&dev, buf, nbytes < BUF_SIZE ? nbytes : BUF_SIZE);
fprintf(stderr, "Recv: %s\n", buf);
break;
default:
fprintf(stderr, "WaitForSingleObject error\n");
break;
}
}
return EXIT_SUCCESS;
} |
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