#include "__serial.h"

#if defined(_WIN32) && !defined(_XBOX) && !defined(__LIBRETRO__)

HANDLE SerialPort = NULL;	// Handle of SerialPort itself.

BOOL SerialOpen(int port, int baud) {
	HANDLE Comport;
	DCB myDCB;
	COMMTIMEOUTS CTout;
	char str[100];

	if (port > 9)
		sprintf(str, "\\\\.\\COM%d", port);
	else
		sprintf(str, "COM%d", port);

	// Open the serial port
	if ((Comport = CreateFile(str, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL)) == INVALID_HANDLE_VALUE)
		return FALSE;

	// Configure Serial port (Setup Comm)

	// Buffer sizes
	if (!SetupComm(Comport, 128, 128))
		return FALSE;

	// Setup DCB using current values
	if (!GetCommState(Comport, &myDCB))
		return FALSE;

	myDCB.fInX = FALSE;		// Turn off xon/xoff handler
	myDCB.fOutX = FALSE;
	myDCB.fOutxDsrFlow = FALSE;
	myDCB.fOutxCtsFlow = FALSE;		// no hardware flow control.
	myDCB.BaudRate = baud;
	myDCB.DCBlength = sizeof(DCB);
	myDCB.fBinary = 1;
	myDCB.fParity = 0;
	myDCB.fDtrControl = DTR_CONTROL_DISABLE;
	myDCB.fDsrSensitivity = 0;
	myDCB.fTXContinueOnXoff = 1;
	myDCB.fNull = 0;
	myDCB.fRtsControl = RTS_CONTROL_DISABLE;
	myDCB.fDummy2 = 0;
	myDCB.wReserved = 0;
	myDCB.Parity = NOPARITY;
	myDCB.StopBits = ONESTOPBIT;
	myDCB.wReserved1 = 0;
	myDCB.ByteSize = 8;

	if (!SetCommState(Comport, &myDCB))
		return FALSE;

	// Set timeouts
	CTout.ReadIntervalTimeout = 0xffffffff;
	CTout.ReadTotalTimeoutMultiplier = 0;
	CTout.ReadTotalTimeoutConstant = 0;
	CTout.WriteTotalTimeoutMultiplier = 0;
	CTout.WriteTotalTimeoutConstant = 5000;			// don't hang if CTS is locked, for example

	SetCommTimeouts(Comport, &CTout);
	EscapeCommFunction(Comport, SETDTR);
	PurgeComm(Comport, PURGE_TXCLEAR | PURGE_RXCLEAR);

	SerialPort = Comport;

	return TRUE;
}

void SerialClose(void) {
	if (SerialPort == NULL) return;

	PurgeComm(SerialPort, PURGE_TXCLEAR | PURGE_RXCLEAR);
	CloseHandle(SerialPort);

	SerialPort = NULL;
}

BOOL SerialSendChar(int c) {
	DWORD cr;
	if (WriteFile(SerialPort, &c, 1, (LPDWORD)&cr, NULL) && cr)
		return TRUE;
	else
		return FALSE;
}

int SerialIsOpen(void) {
	return(SerialPort != NULL);
}

int SerialGetChar(void) {
	uint8 ch;
	DWORD cr;
	if (SerialPort != NULL) {
		if (ReadFile(SerialPort, &ch, 1, (LPDWORD)&cr, NULL) && cr)
			return (int)ch;
	}
	return EOF;
}

void SendCmd(uint8 *cmd, int size) {
	int i;
	for (i = 0; i < size; i++) {
		SerialSendChar(cmd[i]);
	}
}

int ReadResp(uint8 *resp, int size) {
	int i = 0, sum = 0, data;
	while (i < size) {
		while ((data = SerialGetChar()) == EOF) {
		}
		resp[i] = data & 0xff;
		sum += (data & 0xff);
		i++;
	}
	return sum;
}
#else

/* code is not portable, so make stubs for now */

BOOL SerialOpen(int port, int baud) {
	return FALSE;
}

void SerialClose(void) {
}

BOOL SerialSendChar(int c) {
	return FALSE;
}

int SerialIsOpen(void) {
	return FALSE;
}

int SerialGetChar(void) {
	return EOF;
}

void SendCmd(uint8 *cmd, int size) {
}

int ReadResp(uint8 *resp, int size) {
	return 0;
}

#endif