spi_write_register.c

MatLab图像传感器网络仿真平台WiSNAP

/*******************************************************************************
 * Serial Peripheral Interface (4-wire SPI) register write.                    *
 * Syntax: Status = Spi_Write_Register(Port, Address, Value)                   *
 *                                                                             *
 *    Input Parameters:                                                        *
 *    ================                                                         *
 *                                                                             *
 *       Port --------> Parallel port base address decimal (positive integer). *
 *       Address -----> Register address decimal (positive integer).           *
 *       Value -------> Register value decimal (positive integer).             *
 *                                                                             *
 *    Output Parameters:                                                       *
 *    =================                                                        *
 *                                                                             *
 *       Status ------> Success status (-1 = error, +1 = success).             *
 *                                                                             *
 *    See also Spi_Read_Register().                                            *
 *                                                                             *
 * Compile: mex -v spi_write_register.c ms_spi.c inpout32.lib                  *
 * Version: 02-02-2005                                                         *
 *                                                                             *
 * (C) 2005 Stephan Hengstler, Stanford Wireless Sensor Networks Lab           *
 *******************************************************************************/


#include <stdio.h>
#include <windows.h>
#include "mex.h"

void mexFunction(int nlhs, mxArray *plhs[],int nrhs, const mxArray *prhs[])
{
	double		*result;
	int         status;
	short	      address, port, value;

	/* get the value(s) of the input variable(s) */
	port 			= (short) mxGetScalar(prhs[0]);
	address		= (short) mxGetScalar(prhs[1]);
	value		   = (short) mxGetScalar(prhs[2]);

	/* call the respective subroutine(s) */
   status     	= spi_write_register(port, address, value);

	/* set the value(s) of the output variable(s) */
	plhs[0] 		= mxCreateDoubleMatrix(1, 1, mxREAL);
   result		= mxGetPr(plhs[0]);
	*result		= status;

	/* show debug information */
	if (nrhs == 4)
	{
		printf("Debug Information\n");
		printf("port      = %d\n", port);
		printf("address   = %d\n", address);
		printf("value     = %d\n", value);
		printf("status    = %d\n", status);
	}

	/* clean exit */
	return;
}