sio_usbtest.c

DSP/BIOS Driver Developer Kit 1.11 The DSP/BIOS Driver Developer Kit (DDK) provides a selection of

/*
 *  Copyright 2003 by Texas Instruments Incorporated.
 *  All rights reserved. Property of Texas Instruments Incorporated.
 *  Restricted rights to use, duplicate or disclose this code are
 *  granted through contract.
 *  
 */
/* "@(#) DDK 1.11.00.00 11-04-03 (ddk-b13)" */
/* 
 *  ======== sio_usbtest.c ========
 * 
 *  This example demonstrates the use of the USB IOM driver with SIO APIs by 
 *  using the DIO class driver with a User-Defined device USB mini-driver.
 *  This is the loopback application where data is read 
 *  from an input SIO stream, then sent back via an output SIO stream.
 *
 *  The following objects need to be created in the DSP/BIOS
 *  configuration for this application:
 *
 *  * A UDEV object, which links in a user device driver. In this
 *    case the UDEV is coded based IOM device driver.
 *  * DIO objects, which links the UDEV object. Channel Parameters are
 *      configured here for each USB channel used.
 *  * A TSK object, with the function to run set to the function myUsbTask
 *    defined in this file.
 *  * A LOG named trace for debug and status output.
 *  * A SEM object used to block until the USB bus is connected.
 */

#include <std.h>

#include <c5509_usb.h>
#include <log.h>
#include <sio.h>
#include <sys.h>


#define SIOBUFSIZE 256  /* SIO buffer size */
/*
 *  USB buffer size is one word greater than data size because the first word
 *    is used to save actual transfer length(in bytes) for the USB peripheral.
 *  If needed, applications can used this first field to read the USB byte
 *    count sent from the host.
 */
#define USBBUFSIZE (SIOBUFSIZE + 1)  /* USB actual buffer size */

extern LOG_Obj trace;
extern SEM_Obj usbDeviceConnect;


/* Function prototype */
static Void createStreams();

/*
 * Stream handles.
 */
static SIO_Handle inStream, outStream;

/*
 * Application function that gets called when USB bus is connected.
 */
static C5509_USB_AppCallback deviceConnectCb = {
    (C5509_USB_TappCallback)SEM_post,  /* fxn */
    &usbDeviceConnect   /* arg. semaphore handle to post when/if connected */
};




Void main()
{
    LOG_printf(&trace, "test started");
}


/*
 * ======== createStreams ========
 */
static Void createStreams()
{
    SIO_Attrs attrs;    
    attrs = SIO_ATTRS;
    attrs.model = SIO_ISSUERECLAIM;

    /* create bulk type dsp input stream for USB endpoint #2 */
    inStream = SIO_create("/dioUsb2", SIO_INPUT, SIOBUFSIZE, &attrs);
    if (inStream == NULL) {
        SYS_abort("Create input stream FAILED.");
    }

    /* create bulk type dsp output stream for USB endpoint #2 */
    outStream = SIO_create("/dioUsb2", SIO_OUTPUT, SIOBUFSIZE, &attrs);
    if (outStream == NULL) {
        SYS_abort("Create output stream FAILED.");
    }

    /* connect USB device to the host */ 
    SIO_ctrl(outStream, C5509_USB_DEVICECONNECT, &deviceConnectCb );
     
    SEM_pend(&usbDeviceConnect, SYS_FOREVER);/* block until bus is connected */
}



/*
 * ======== myUsbTask ========
 * This function copies from the input stream to the output stream.  
 */
Void myUsbTask()
{
    Int nmadus;

    Ptr inbuf0, inbuf1, outbuf0, outbuf1;

    /* create I/O streams */
    createStreams();
    
    /*
     * Both input and output streams are created double buffered for performance.
     * Initially, allocate stream buffers and issue 2 empty buffers to input stream. Then
     *  reclaim two full input buffers and issue them to the output stream. 
     */
    inbuf0 = MEM_calloc(0, USBBUFSIZE, 0);
    inbuf1 = MEM_calloc(0, USBBUFSIZE, 0);
    outbuf0 = MEM_calloc(0, USBBUFSIZE, 0);
    outbuf1 = MEM_calloc(0, USBBUFSIZE, 0);

    if (inbuf0 == NULL || inbuf1 == NULL || 
            outbuf0 == NULL || outbuf1 == NULL) {
        SYS_abort("MEM_calloc failed.");
    } 

    /* Prime the input stream with two empty buffers */
    if (SIO_issue(inStream, inbuf0, SIO_bufsize(inStream), NULL) != SYS_OK) {
        SYS_abort("Error issuing buffer to the input stream");
    }

    if (SIO_issue(inStream, inbuf1, SIO_bufsize(inStream), NULL) != SYS_OK) {
        SYS_abort("Error issuing buffer to the input stream");
    }

    /* Reclaim 1st full buffer from input stream and process */
    if ((nmadus = SIO_reclaim(inStream, (Ptr *)&inbuf0, NULL)) < 0) {
        SYS_abort("Error reclaiming full buffer from the input stream");
    }
    
    /* Issue the full buffer to the output stream */
    if (SIO_issue(outStream, inbuf0, nmadus, NULL) != SYS_OK) {
        SYS_abort("Error issuing buffer to the output stream");
    }

    /* Issue another empty buffer to input stream. */
    if (SIO_issue(inStream, outbuf0, SIO_bufsize(inStream), NULL) != SYS_OK) {
        SYS_abort("Error issuing buffer to the input stream");
    }

    /* Reclaim 2nd full buffer from input stream and process */
    if ((nmadus = SIO_reclaim(inStream, (Ptr *)&inbuf0, NULL)) < 0) {
        SYS_abort("Error reclaiming full buffer from the input stream");
    }

    /* Issue another empty buffer to input stream. */
    if (SIO_issue(inStream, outbuf1, SIO_bufsize(inStream), NULL) != SYS_OK) {
        SYS_abort("Error issuing buffer to the input stream");
    }

    /* Issue the full buffer to the output stream. */
    if (SIO_issue(outStream, inbuf0, nmadus, NULL) != SYS_OK) {
        SYS_abort("Error issuing buffer to the output stream");
    }  

    /* 
     *  Now, both streams have two buffers and we have echod back
     *   two full buffers of data.
     *   Loop forever .
     */
    for (;;) {

        /* Reclaim buffer with data from the input stream */
        if ((nmadus = SIO_reclaim(inStream, (Ptr *)&inbuf0, NULL)) < 0) {
            SYS_abort("Error reclaiming full buffer from the input stream");
        }

        /* Reclaim empty buffer from the output stream to be reused */
        if (SIO_reclaim(outStream, (Ptr *)&outbuf0, NULL) < 0) {
            SYS_abort("Error reclaiming empty buffer from the output stream");
        }

        /*
         * Do any data processing here.
         *  Note: The first word of inbuf0 buffer contains the actual 
         *     USB data byte count.
         */

        /* Issue buffer to the output stream */
        if (SIO_issue(outStream, inbuf0, nmadus, NULL) != SYS_OK) {
     
            SYS_abort("Error issuing full buffer to the output stream");
        }

        /* Issue an empty buffer to the input stream */
        if (SIO_issue(inStream, outbuf0, SIO_bufsize(inStream), NULL) != SYS_OK) {
            SYS_abort("Error issuing empty buffer to the input stream");
        }
    }
}