ftdi_read_data return 0xff

[Rodrigo Rosa <rodrigorosa.lg@xxxxxxxxx>]

Hello,

I'm trying to use a ft2232 with MPSSE and JTAG.

I managed to get the device to respond to 0xAA (bogus code) with [0xFA 0xAA], but everytime I try to read I get 0xff.

any ideas?

Example:

    unsigned char output_buff[1024];

    unsigned char input_buff[1024];

    uint numBytesToSend = 0;

    uint numBytesToRead = 0;

    uint numBytesSent = 0;

    uint numBytesRead = 0;

        numBytesToSend = 0;

        output_buff[numBytesToSend++]=0x1A;

        output_buff[numBytesToSend++]=0x01;

        output_buff[numBytesToSend++]=0xAA;

        numBytesSent = ftdi_write_data(&ftdic, output_buff, numBytesToSend);

        //read

        numBytesToRead = numBytesSent;

        numBytesToSend = 0;

        output_buff[numBytesToSend++]=0x2E;

        output_buff[numBytesToSend++]=0x01;

        numBytesSent = ftdi_write_data(&ftdic, output_buff, numBytesToSend);

        numBytesToRead = numBytesSent;

        input_buff[0]=0x00;input_buff[1]=0x00;input_buff[2]=0x00;

        numBytesRead = ftdi_read_data(&ftdic, input_buff, numBytesToRead);

My objective is to be able to use the ft2232 to flash another device via JTAG.

I've based my implementation on ioftdi from xc3sprog.

Thanks!

--
Rodrigo.

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