/
aioUsbApi.c
executable file
·4977 lines (4050 loc) · 128 KB
/
aioUsbApi.c
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#include <arpa/inet.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
#include <time.h>
#include "aioUsbApi.h"
#include "libusb.h"
/****************************************************************************/
// AcessIO_LinuxUsbAPI
//
// Release 1.0
//
// Description:
// Linux Implementation of the Access/IO USB SW API Interface which
// enables applications to interface with ACCES/IO devices which use
// a USB Interface to communicate with a host computer.
//
// There is a similar API for Windows. The implementation of the APIs
// is not the same
//
// Author : Jeff Price
// History : 11/06/2009 created
//
//
// Notes :
//
//
// The API requires Linux version 2.6 or greater
//
//
// Refer to the ACCES/IO Software Reference Manual for a description
// of the each of the functions.
//
//
//
// Currently only 1 BulkAcquire processcan be in progress at only one time
// this per device
//
// The Linux USB INTERFACE :
//
// The opensource code 'libusb' is used to for all USB related functions.
//
// libusb is an user-space API to the lower level standard linux USB EFCI Host
// kernel-mode device driver which interfaces directly with the USB hardware.
// The libusb API enables user-space applications to interface with the USB
// subsytem without requiring writing or modifying an actual kernel-mode
// device driver
//
// The source code and documentation on libusb which describes
// each of the libusb calls used in this Access/IO usb API can
// be found at :
//
// http://libusb.wiki.sourceforge.net
//
//
// This Release 1.0 of the ACCES/IO API uses libusb 1.0. However any
// later release of libusb should work.
//
// DEBUGGING:
//
//
// Each of the functions return and error code defined in
// aioUsbApi.h which provides specific information on reason
// for the failure.
//
// Compiling the code with -DDEBUG causes the debug statements to me
// output; or you can explictly define it in this file as the first line
// before the "ifdef DEBUG" conditional.
// Compiling the code with -DDEBUG causes the debug statements to me
// output otherwise they are not output
//
// Refer to the libusb documentation from sourceforge (or look at the libusb source)
// to see how to enable libusb debugging.
//
//
//************************************************************************
int g_fatalSystemError = 0;
struct timespec bulkPollTime;
#define SET_BIT (bitmap | bit)
#define BITS_PER_INT (sizeof(int) * 8)
struct libusb_device_handle *G_HAND;
void clear_bit(void *bitmap, size_t bit_no)
{
((int *) bitmap)[bit_no / BITS_PER_INT] &=
~(1 << (bit_no % BITS_PER_INT));
}
//struct libusb_transfer *g_pendingXfers[MAX_PENDING_XFERS];
typedef struct
{
int xferRecId;
int devIdx;
unsigned char *pBuf; // caller of BulkAquire's buffer
unsigned char *pXferBuf; // buffer passed into submit_xfer call
} bulkXferParam;
aioDeviceInfo aioDevs;
typedef struct
{
int inUse;
bulkXferParam userData;
struct libusb_transfer *pXfer;
} bulkXferRec;
bulkXferRec bulkXferPool[MAX_PENDING_XFERS];
bulkXferRec *
getBulkXferRec ()
{
int i;
int found;
for (i=0; i<MAX_PENDING_XFERS;i++)
{
if (bulkXferPool[i].inUse == 0)
{
bulkXferPool[i].inUse = 1;
bulkXferPool[i].userData.xferRecId = i;
bulkXferPool[i].pXfer = libusb_alloc_transfer(0);
if (bulkXferPool[i].pXfer == NULL)
{
debug("DBG>> getBulkXferRec : libusb_alloc_transfer failed \n");
return (NULL);
}
bulkXferPool[i].pXfer->timeout = 5000.0;
// free'd in bulkReadCallBack function
bulkXferPool[i].userData.pXferBuf = (unsigned char *)calloc(BYTES_PER_READ,8);
if (bulkXferPool[i].userData.pXferBuf == NULL)
{
debug("DBG>> getBulkXferRec : calloc failed \n");
return (NULL);
}
found = 1;
break;
}
}
if (found)
return (&bulkXferPool[i]);
else
return (NULL);
}
void
freeBulkXferRec(bulkXferRec *pBulkXferRecord)
{
bulkXferPool[pBulkXferRecord->userData.xferRecId].inUse = 0;
free(pBulkXferRecord->userData.pXferBuf);
libusb_free_transfer(pBulkXferRecord->pXfer);
}
// returns the index in the aio device list corresponding
// to the input device index
int
getListIndex(devIdx)
{
int idx;
int devFound;
// find the right entry in the list
for (idx = 0; idx < aioDevs.numAIODevs; idx++)
{
if (aioDevs.aioDevList[idx].devIdx == devIdx)
{
devFound = 1;
break;
}
}
if (devFound)
return (idx);
else
{
debug("DBG>>GetListIndex : No entry in lust for devIdx = %d\n",devIdx);
return (ERROR_NO_AIO_DEVS_FOUND);
}
}
void
sampleBulkReadCallBack (struct libusb_transfer *transfer)
{
int ret;
int idx;
int devIdx;
int bufIdx;
unsigned char *buf;
int len;
bulkXferRec *pBulkXferRec;
bulkXferRec *pParams;
int bytesLeft;
int i;
// NOTE : if the user_data is invalid something is really hosed up in libusb
// so we set a global g_FatalSySERR to terminate
// the while loop in BulkAcquire
// The debug stmts below will indicate this condition has occured
// but there is no graceful recovery. The application must be
// stopped and restarted.
//
if (transfer->user_data == NULL)
{
g_fatalSystemError = 1;
debug("DBG>>AIO_Usb_sampleBulkReadCallBack: FATAL SYSTEM ERROR : user_data param struct is NULL\n");
return;
}
/*****
//For DEBUG only
int j,k=0;
float volts;
printf("\n");
for (j=0;j<16;j++)
{
volts = (transfer->buffer[k+1] << 8) | (transfer->buffer[k]);
k+=2;
volts = (volts/65535.0) * 10.0;
printf(" IN CALLBACK CHAN %d Volts=%f K=0x%x K+1=0x%x \n",j,volts,transfer->buffer[k],transfer->buffer[k+1]);
}
******/
pParams = (bulkXferRec *)transfer->user_data;
if (pParams->userData.pBuf == NULL)
{
g_fatalSystemError = 1;
debug("DBG>>AIO_Usb_sampleBulkReadCallBack: FATAL SYSTEM ERROR : user_data.pBuf is NULL \n");
return;
}
buf = pParams->userData.pBuf;
devIdx = pParams->userData.devIdx;
ret = AIO_UsbValidateDeviceIndex(devIdx);
if (ret > ERROR_SUCCESS)
{
g_fatalSystemError = 1;
debug("DBG>>AIO_Usb_sampleBulkReadCallBack: FATAL SYSTEM ERROR invalid DeviceIndex = 0x%0x \n",(unsigned int)devIdx);
return;
}
idx = getListIndex(devIdx);
if (ret > ERROR_SUCCESS)
{
g_fatalSystemError = 1;
debug("DBG>>AIO_Usb_sampleBulkRead: FATAL SYSTEM ERROR No Entry in lust for devIdex = %d\n",(unsigned int)devIdx);
}
if (transfer->status == LIBUSB_TRANSFER_COMPLETED)
{
// copy the user data into the global sample buffer
// in the BulkAquireCall the user's buffer passed in
// is set to point to the global sample buffer
//
bufIdx = aioDevs.aioDevList[idx].sampleBytesRead;
memcpy((void *)(buf+bufIdx),
(void *)transfer->buffer,
transfer->actual_length);
aioDevs.aioDevList[idx].sampleBytesRead =
aioDevs.aioDevList[idx].sampleBytesRead + transfer->actual_length;
aioDevs.aioDevList[idx].sampleBytesLeftToRead =
aioDevs.aioDevList[idx].sampleBytesLeftToRead - transfer->actual_length;
freeBulkXferRec(pParams);
aioDevs.aioDevList[idx].sampleReadsCompleted++;
}
else
{
if (transfer->status == LIBUSB_TRANSFER_TIMED_OUT)
aioDevs.aioDevList[idx].sampleReadTimeouts++;
debug("DBG>> bulkReadCallback: BULK XFER Error. Transfer not completed. Status=%d\n", transfer->status);
freeBulkXferRec(pParams);
}
bytesLeft = aioDevs.aioDevList[idx].sampleBytesLeftToRead;
// submit more reads until all required ones have been submitted
// we always want to have several in the queue pending to avoid
// data overruns in the device
for (i=0;
i < 10;
i++)
{
if (aioDevs.aioDevList[idx].sampleReadsSubmitted <
aioDevs.aioDevList[idx].sampleReadsRequired )
{
if (aioDevs.aioDevList[idx].sampleBytesLeftToRead >= BYTES_PER_READ)
len = BYTES_PER_READ;
else
len = aioDevs.aioDevList[idx].sampleBytesLeftToRead;
//printf("LEN to Read =%d\n",len);
// get a xfer struct
pBulkXferRec = getBulkXferRec();
if (pBulkXferRec == NULL)
{
debug("DBG>> bulkAquire: MAX_PENDING_XFERS EXceeded \n");
}
pBulkXferRec->userData.devIdx = devIdx;
// this is the beginning of the caller of this functions buffer
// data is appended to it upon each transfer completion in the sampleBulkReadCallback
pBulkXferRec->userData.pBuf = buf;
libusb_fill_bulk_transfer(pBulkXferRec->pXfer,
aioDevs.aioDevList[idx].devHandle,
(6 | LIBUSB_ENDPOINT_IN),
pBulkXferRec->userData.pXferBuf,
len,
sampleBulkReadCallBack,
(void *)(pBulkXferRec),
0);
ret = libusb_submit_transfer(pBulkXferRec->pXfer);
if (ret < 0 )
{
freeBulkXferRec(pBulkXferRec);
debug("DBG>> bulkAquire: libusb_submit_transfer failed ; ret = %d\n",ret);
ret = libusb_release_interface(transfer->dev_handle,0);
}
bytesLeft = bytesLeft - len;
aioDevs.aioDevList[idx].sampleReadsSubmitted++;
}
}
}
struct libusb_device_handle *
getDevHandle(int devIdx)
{
int ret;
int idx;
struct libusb_device *device;
struct libusb_device_handle *devHandle;
int productId;
ret = AIO_UsbValidateDeviceIndex(devIdx);
if (ret > ERROR_SUCCESS)
{
debug("DBG>>getDevHandle : invalid dev Index = %d \n",(unsigned int)devIdx);
return (NULL);
}
idx = getListIndex(devIdx);
if (ret > ERROR_SUCCESS)
{
debug("DBG>>getDevHandle : No Entry in lust for devIdex = %d\n",(unsigned int)devIdx);
return (NULL);
}
// get the descriptor for this device
device = aioDevs.aioDevList[idx].device;
productId = aioDevs.aioDevList[idx].productId;
devHandle = libusb_open_device_with_vid_pid(NULL,0x1605,productId);
if (devHandle == NULL)
debug("DBG>>getDevHandle : Cannot Get Device Handle for ProductId=0x%x devIdx=%d\n",productId,(unsigned int)devIdx);
if (ret < 0)
{
debug("DBG>>getDevHandle : could not get device handle devIdx = %d \n",(unsigned int)devIdx);
return (NULL);
}
else
return (devHandle);
}
struct timespec bulkPollTime;
unsigned char *sampleDataBuf;
int
validateProductID(int devIdx)
{
int ret;
unsigned long prodID;
unsigned long nameSize;
char name[100];
unsigned long DIOBytes;
unsigned long counters;
// need to make this match calling functions to
// product family.
return (ERROR_SUCCESS);
ret = AIO_Usb_QueryDeviceInfo(devIdx,
&prodID,
&nameSize,
name,
&DIOBytes,
&counters);
if (ret > ERROR_SUCCESS)
{
debug("DBG>>validateProductID: AIO_UsbQueryDeviceInfo failed err = %d \n",ret);
return (ret);
}
if (prodID != USB_AIO_AI16_16A_DEV)
{
debug("DBG>>validateProductID : Invalid Product ID = 0x%0x \n",(unsigned int)prodID);
return (ERROR_UNSUPPORTED_DEVICE);
}
else
return (ERROR_SUCCESS);
}
// returns a valid device num or ERROR code
int
AIO_UsbValidateDeviceIndex(int devIdx)
{
int i;
int numDevs = 0;
int devFound = 0;
// get the first AIO device
if (devIdx == DI_FIRST)
{
for (i = 0; i < aioDevs.numAIODevs; i++)
{
if (aioDevs.aioDevList[i].devIdx != NO_DEVICE)
{
devFound = 1;
break;
}
}
if (devFound)
return (aioDevs.aioDevList[i].devIdx);
else
{
debug("DBG>>Validate Index: called with DI_FIRST and no AIO device found\n");
return (ERROR_INVALID_DEV_IDX);
}
}
if (devIdx == DI_ONLY)
{
// check for more than 1 dev
for (i = 0; i < aioDevs.numAIODevs; i++)
{
if (aioDevs.aioDevList[i].devIdx != NO_DEVICE)
numDevs++;
}
if (numDevs > 1)
{
debug("DBG>>Validate Index: called with DI_ONLY and more than 1 index was found\n");
return (ERROR_DUP_NAME);
}
}
// so make sure the input device exists
for (i = 0; i < aioDevs.numAIODevs; i++)
{
if (aioDevs.aioDevList[i].devIdx == devIdx)
devFound = 1;
}
if (devFound)
return (devIdx);
else
{
debug("DBG>>Validate Index: invalid dev = 0x%x \n",(unsigned int)devIdx);
return (ERROR_INVALID_DEV_IDX);
}
}
short
OctaveDacFromFreq(double *Hz)
{
short octave;
short offset;
short octave_offset;
if (*Hz == 0)
{
return 0;
}
else
{
if (*Hz > 40000000.0)
*Hz = 40000000.0;
octave = floor(3.322 * log10(*Hz/1039));
if (octave < 0)
{
octave = 0;
offset = 0;
return 0;
}
else
{
offset = floor( (double)(2048 - ( ldexp(2078, 10 + octave)/ *Hz) ) );
octave_offset = (octave << 12) | (offset << 2);
// the bytes must be swapped because the oscillator
// wants the value in Motorola woredj
octave_offset = htons(octave_offset);
*Hz = (2078 << octave) / (2 - offset / 1024);
}
}
return (octave_offset);
}
/********************************************************************/
//
// Function Name : AIO_Usb_GetDevices
//
// Description :
// populates the array of AIO device numbers
//
//
//
// Returns : ERROR_SUCCESS , meaning aioDevList is correctly
// populated
//
// ERROR_NO_AIO_DEVS_FOUND if no AIO devs found
//
// NOTE : aioDevList is not populated in this case
// and the Api cannot be used until
// this function completes successfully.
//
// Notes :
// IMPORTANT : this function must be called at least once
// before any other function in the API is
// called.
//
// History :
//
/********************************************************************/
int
AIO_Usb_GetDevices(aioDeviceInfo *pAioDeviceInfo)
{
struct libusb_device **devs;
struct libusb_device *dev;
int i,j;
int ret;
// initialize the aio dev list
aioDevs.numAIODevs = 0;
for (i = 0; i < MAX_USB_DEVICES; i++)
{
aioDevs.aioDevList[i].devHandle = NULL;
aioDevs.aioDevList[i].device = NULL;
aioDevs.aioDevList[i].devIdx = NO_DEVICE;
aioDevs.aioDevList[i].productId = 0;
aioDevs.aioDevList[i].sampleBytesToRead = 0;
aioDevs.aioDevList[i].sampleBytesRead = 0;
aioDevs.aioDevList[i].sampleBytesLeftToRead = 0;
aioDevs.aioDevList[i].sampleReadInProgress = 0;
aioDevs.aioDevList[i].sampleReadsRequired = 0;
aioDevs.aioDevList[i].sampleReadsCompleted = 0;
aioDevs.aioDevList[i].sampleReadTimeouts = 0;
aioDevs.aioDevList[i].sampleReadBulkXferError = 0;
aioDevs.aioDevList[i].pSampleReadBuf = NULL;
aioDevs.aioDevList[i].DIOBytesToRead = 0;
aioDevs.aioDevList[i].DIOBytesRead = 0;
aioDevs.aioDevList[i].DIOBytesLeftToRead = 0;
aioDevs.aioDevList[i].DIOReadsRequired = 0;
aioDevs.aioDevList[i].DIOReadsSubmitted = 0;
aioDevs.aioDevList[i].DIOReadsCompleted = 0;
aioDevs.aioDevList[i].DIOReadTimeouts = 0;
aioDevs.aioDevList[i].DIOReadBulkXferError = 0;
aioDevs.aioDevList[i].pDIOReadBuf = NULL;
aioDevs.aioDevList[i].DIOBytesToWrite = 0;
aioDevs.aioDevList[i].DIOBytesWritten = 0;
aioDevs.aioDevList[i].DIOBytesLeftToWrite = 0;
aioDevs.aioDevList[i].DIOWritesRequired = 0;
aioDevs.aioDevList[i].DIOWritesCompleted = 0;
aioDevs.aioDevList[i].DIOWriteTimeouts = 0;
aioDevs.aioDevList[i].DIOWriteBulkXferError = 0;
aioDevs.aioDevList[i].pDIOWriteBuf = NULL;
aioDevs.aioDevList[i].streamOp = STREAM_OP_NONE;
}
ret = libusb_get_device_list(NULL,&devs);
if (ret <0)
{
debug("DBG>>getDevices : could not get device list \n");
return (ERROR_COULD_NOT_GET_DEVLIST);
}
i = 0;
j = 0;
while ((dev = devs[i++]) != NULL)
{
struct libusb_device_descriptor desc;
ret = libusb_get_device_descriptor(dev, &desc);
if (ret < 0)
{
debug("DBG>>GetDevices: libusb_get_device_descriptor failed ret=%d \n",ret);
return (ERROR_COULD_NOT_GET_DESCRIPTOR);
}
if (desc.idVendor == ACCES_VENDOR_ID)
{
aioDevs.aioDevList[j].devHandle = NULL;
aioDevs.aioDevList[j].device = dev;
aioDevs.aioDevList[j].devIdx = i;
aioDevs.aioDevList[j].productId = desc.idProduct;
aioDevs.numAIODevs++;
j++;
}
}
if (aioDevs.numAIODevs == 0)
{
debug("DBG>>GetDevices : NO AIO Devices Found\n");
libusb_free_device_list(devs, 1);
return(ERROR_NO_AIO_DEVS_FOUND);
}
else
{
//AIO_UsbListDevices();
libusb_free_device_list(devs, 1);
*pAioDeviceInfo = aioDevs;
}
return (ERROR_SUCCESS);
}
void
AIO_UsbListDevices()
{
int i;
if (aioDevs.numAIODevs == 0)
printf("No AIO Devices Found\n");
else
{
printf("AIO Devices Found : \n");
for (i=0; i<aioDevs.numAIODevs; i++)
{
printf(" Device Index = %d \n",(unsigned int)aioDevs.aioDevList[i].devIdx);
printf(" Product ID = 0x%x\n",aioDevs.aioDevList[i].productId);
switch(aioDevs.aioDevList[i].productId)
{
case 0x8040:
printf(" Product Name = USB-AI16-16A");
default:
break;
}
}
}
}
/********************************************************************/
//
// Function Name : AIO_Usb_QueryDeviceInfo
//
// Description :
//
// Returns :
//
// Notes
//
// History :
//
/********************************************************************/
unsigned long
AIO_Usb_QueryDeviceInfo(unsigned long devIndex,
unsigned long *pProdID,
unsigned long *pNameSize,
char *pName,
unsigned long *pDIOBytes,
unsigned long *pCounters)
{
int ret;
int bytes, counters,idx;
if ( ( pProdID == NULL ||
pNameSize == NULL ||
pName == NULL ||
pDIOBytes == NULL ||
pCounters == NULL) )
{
debug("DBG>>AIO_UsbQueryInfo : NULL Pointer passed as argument \n");
return (ERROR_INVALID_PARAM);
}
ret = AIO_UsbValidateDeviceIndex(devIndex);
if (ret > ERROR_SUCCESS)
{
debug("DBG>>AIO_UsbQueryInfo : invalid dev Index = 0x%0x \n",(unsigned int)devIndex);
return (ret);
}
idx = getListIndex(devIndex);
if (ret > ERROR_SUCCESS)
{
debug("DBG>>AIO_UsbQueryInfo : No Entry in lust for devIdex = %d\n",(unsigned int)devIndex);
return (ret);
}
switch (aioDevs.aioDevList[idx].productId)
{
case USB_DIO_32_ID_DEV:
bytes = 4;
counters = 3;
break;
case USB_DA12_8A_REVA_DEV:
case USB_DA12_8A_DEV:
bytes = 0;
counters = 0;
break;
case USB_IIRO_16_DEV:
bytes = 4;
counters = 0;
break;
case USB_CTR_15_DEV:
bytes = 0;
counters = 5;
break;
case USB_IIRO4_2SM_DEV:
bytes = 2;
counters = 0;
break;
case USB_AIO_AI16_16A_DEV:
if ( (pProdID != NULL) &&
(pNameSize != NULL) &&
(pName != NULL) &&
(pDIOBytes != NULL) &&
(pCounters != NULL) )
{
*pProdID = USB_AIO_AI16_16A_DEV;
*pNameSize = 12;
strncpy (pName,"USB-AIO-AI16",12);
*pDIOBytes = 2;
*pCounters = NUM_AI_16_COUNTERS;
}
else
return (ERROR_INVALID_PARAM);
break;
default:
return (ERROR_NO_AIO_DEVS_FOUND);
}
return ERROR_SUCCESS;
}
/********************************************************************/
//
// Function Name : AIO_Usb_ADC_SetCal
//
// Description :
//
// Returns :
//
// Notes
//
// History :
//
/********************************************************************/
unsigned long
AIO_Usb_ADC_SetCal(unsigned long devIdx,
char *calFileName)
{
struct libusb_device_handle *handle;
int i;
int ret;
int numBytes;
short sramAddr;
unsigned short dataBuf1[65536]; // sram is 64K 2-byte words
unsigned char dataBuf2[131072];
unsigned char dataBuf3[2048];
char *pdataBuf;
int dataWritten;
FILE *calFile;
if (calFileName == NULL)
{
debug("DBG>>AIO_SetCal: NULL filename passed in \n");
return (ERROR_INVALID_PARAM);
}
ret = AIO_UsbValidateDeviceIndex(devIdx);
if (ret > ERROR_SUCCESS)
{
debug("DBG>>AIO_SetCal: invalid DeviceIndex = 0x%0x \n",(unsigned int)devIdx);
return (ret);
}
ret = validateProductID(devIdx);
if (ret > ERROR_SUCCESS)
{
debug("DBG>>AIO_SetCal: invalid ProductID for device : 0x%0x \n",(unsigned int)devIdx);
return (ret);
}
handle = getDevHandle(devIdx);
if (handle == NULL)
{
debug("DBG>> AIO_Usb_DIO_ReadAll : could not get device handle devIdx=%d \n",(unsigned int)devIdx);
return (ERROR_COULD_NOT_GET_DEVHANDLE);
}
if ( (strncmp(calFileName,":NONE:",6) ) == 0)
{
// create a default file
// fill a buf of 64K 2-byte words
// with a counting seq from 0 - 0xFFFF
for (i= 0; i < 0xFFFF + 1; i++)
{
dataBuf1[i] = i;
}
// we want the data to be in a char array
// to pass it to bulk_write 2048 bytes
// (1024 words) at a time.
// the 2 byte words are each
// stored in two successive
// locations of a character array;
//
// so the array of the 64K 2 byte words
// stored as a char array should look like :
// x[0] = 0
// x[1] = 0
// x[2] = 0
// x[3] = 1
// x[4] = 0
// x[5] = 2
// ...
// ...
// x[131070] = FF
// x[131071] = FF
memcpy ((void *)&dataBuf2[0],(void *)&dataBuf1,131072);
/* use the default file from the release */
// calFile = fopen("0000-FFFF.bin","r");
}
else
{
calFile = fopen(calFileName,"r");
if (calFile == NULL)
{
debug("DBG>> AIO_SetCal: cannot open calFile : %s \n",calFileName);
return (ERROR_CAL_FILE_NOT_FOUND);
}
// fill data with the data in the file
// the file is 131070 bytes long,but
// fgets() only reads up to 'n-1' bytes
//
pdataBuf = fgets((char *)&dataBuf2[0],131072,calFile);
}
ret = libusb_claim_interface(handle,0);
if (ret < 0)
{
debug("DBG>> AIO_SetCal: usb_claim_interface failed 0x%0x err=%d\n",(unsigned int)devIdx,ret);
return (ERROR_LIBUSB_CLAIM_INTF_FAILED);
}
// the calibration file size is 65356 2-byte words
// the AI16 wants the data in 2-byte words
// and bulk_transfer wants count in bytes
// so 64 transfers of 1024 2-byte words or
// 2048 bytes / transfer are needed to download
// the 65356 2 byte words
numBytes = 1024 * 2; // each word is 2 bytes
sramAddr = 0;
for (i = 0; i< 63; i++)
{
memcpy((void *)(&dataBuf3[0]),
(void *)&dataBuf2[sramAddr],
2048);
ret = libusb_bulk_transfer(handle,
(2 | LIBUSB_ENDPOINT_OUT),
(unsigned char *)&dataBuf1[sramAddr],
numBytes,
&dataWritten,
TIMEOUT_5_SEC);
if ( (ret < 0) ||
(dataWritten != numBytes))
{
ret = libusb_release_interface(handle,0);
debug("DBG>> AIO_SetCal: usb_bulk_write failed devIdx=%d err=%d\n",(unsigned int)devIdx,ret);
debug("DBG>> AIO_DIO_StreamFrame : Wrote %d of %d bytes \n",(unsigned int)dataWritten,(unsigned int)numBytes);
return (ERROR_USB_BULK_WRITE_FAILED);
}
ret = libusb_control_transfer(handle,
USB_WRITE_TO_DEV,
SET_CAL,
sramAddr,
1024,
0,
0,
TIMEOUT_5_SEC);