dll function variable deceleration

hai i am using a ADC with USB to SPI converter(MCP2210). i have loaded the dll of converter into matlab. i can able to configure GPIO,clk of converter etc.

But not able to Receive the data with function TxferSpiData in dll of converter.

but with software provided by microchip(SPI terminal mcp2210.exe) getting the ADC data through Converter. i dont understand how to pass arguments with this function and get data into array.

Data provided by Micochip for dll function TxferSpiData use

 Name: TxferSpiData

Purpose: Transfer the specified SPI data

Parameters:

Inputs: dataTx (array<Byte>^) - Array of SPI data to send to device. This array should be at least the same size as numBytes or larger.

 Outputs: dataRx (array<Byte>^) – Array that contains SPI data received. This array should be at least the same size as numBytes or larger.

 Returns: int -

Return value: negative = error

0 = success

*khan=NET.addAssembly('E:\ikram\project\brain machin interface\softwares\usb\MCP2210DLL-M.dll');

khan= MCP2210.DevIO(hex2dec('04D8'),hex2dec('00DE'));

b=buffer(216,27);

c=buffer(216,27);

khan.Functions.TxferSpiData(b,c)*

data is not getting loaded into the variable 'c' buffer, is this deceleration is correct as per the microchip? how to used this function. please Guide me in using this function.

details about the chip is available on--> http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en556614

Thanks & Regards Ikram khan

[ikram khan]

it is my final year project, any one help

[Kaustubha Govind]

You may want to look at the documentation for Call .NET Methods With ref Keyword.