#include <windows.h>

HANDLE hCom;

void OpenCom() {
	DCB	dcb;
	COMMTIMEOUTS	ct;

	hCom = CreateFile("COM2:",
		GENERIC_READ | GENERIC_WRITE,
		0,
		NULL,
		OPEN_EXISTING,
		FILE_ATTRIBUTE_NORMAL,
		NULL);

	if(hCom == INVALID_HANDLE_VALUE)
		exit(1);

	if(!SetupComm(hCom, 8192, 8192))
		exit(1);

	if(!GetCommState(hCom, &dcb))
		exit(1);

	dcb.BaudRate = 115200;
	((DWORD*)(&dcb))[2] = 0x1001; // set port properties for TXDI + no flow-control
	dcb.ByteSize = 8;
	dcb.Parity = NOPARITY;
	dcb.StopBits = 2;
	if(!SetCommState(hCom, &dcb)) exit(1);
	// set the timeouts to 0
	ct.ReadIntervalTimeout = MAXDWORD;
	ct.ReadTotalTimeoutMultiplier = 0;
	ct.ReadTotalTimeoutConstant = 0;
	ct.WriteTotalTimeoutMultiplier = 0;
	ct.WriteTotalTimeoutConstant = 0;

	if(!SetCommTimeouts(hCom, &ct))
		exit(1);
};


void CloseCom() {
	CloseHandle(hCom);
};


DWORD WriteCom(char* buf, int len) {
	DWORD	nSend;

	if(!WriteFile(hCom, buf, len, &nSend, NULL))
		exit(1);

	return nSend;
};


void WriteComChar(char b) {
	WriteCom(&b, 1);
};


int ReadCom(char *buf, int len) {
	DWORD	nRec;
	if(!ReadFile(hCom, buf, len, &nRec, NULL))
		exit(1);

	return (int)nRec;
};


char ReadComChar() {
	DWORD	nRec;
	char	c;

	if(!ReadFile(hCom, &c, 1, &nRec, NULL))
		exit(1);

	return nRec ? c : 0;
};