We have fixed a number of bugs with High Speed Isochronous
transactions, including memory crashers as you describe. This could
very easily be the OS, and not your code.
Many of these fixes will be in a future 10.3 update as well as in
Tiger.
Sorry that this doesn't help you with 10.3.8 and earlier.
Rhoads Hollowell
USB Software Team
Apple Computer, Inc.
On Feb 28, 2005, at 7:46 PM, Juan Pablo Pertierra wrote:
Hello,
I am really hoping someone will point out a dumb error(as usual) in
my software and everything will suddenly work. :D
This software is based on the USBSimple example. I modified it to
read from an isochronous IN endpoint, and it worked perfectly in full
speed mode.
However, when I test my device running in high speed mode, the
software crashes the entire computer. I either get a white-on-black
system crash error text on my screen and have to turn off the
computer, or i get the "reset your computer" message.
It seems like it has something to do with the memory allocation, but
like I said the exact same code work in full speed, and I am only
allocating 16 bytes with malloc, and handing the buffer to
ReadIsochPipeAsync. I use free() at the end.
The weird thing is that the data is read and written to the file,
which makes me feel the error happens in free(). I tried removing
free but that results in the "reboot your computer error".
I am not sure if this is a problem with my code, or maybe
ReadIsochPipeAsync is doing something strange with the buffer.
I have attached my transferData() function where all gets done after
the device is open/configured, etc. Everything happens successfully
until this point, and i am sure the device is connecting at
high-speed according to USB prober. It is also reading all
descriptors correctly.
Thanks in advance!
--------------------------------
#define MAX_READ_FRAME 1
#define REQ_COUNT 16
double endTime = 0;
void
MyCallBackFunction(void *dummy, IOReturn result, void *arg0)
{
// UInt8 inPipeRef = (UInt32)dummy;
endTime = CFAbsoluteTimeGetCurrent();
printf("MyCallbackfunction: %d, %d, %d\n", (int)dummy, (int)result,
(int)arg0);
printf("transferData: END %lf\n", CFAbsoluteTimeGetCurrent());
CFRunLoopStop(CFRunLoopGetCurrent());
}
void transferData(IOUSBInterfaceInterface **intf, UInt8 inPipeRef,
UInt8 outPipeRef)
{
IOReturn err;
CFRunLoopSourceRef cfSource;
int i;
UInt64 frame;
AbsoluteTime atTime;
IOUSBIsocFrame frameList[MAX_READ_FRAME];
int file;
double startTime, intervalTime;
UInt32 actCount = 0;
char *inBuf = 0;
inBuf = malloc(MAX_READ_FRAME*REQ_COUNT);
if(inBuf != NULL)
printf("transferData: %d bytes allocated\n",
(MAX_READ_FRAME*REQ_COUNT));
else
{
printf("transferData: malloc() error!\n");
return;
}
file = open("USBdump.raw", O_WRONLY | O_CREAT, S_IRWXU | S_IRWXG);
if(!file)
{
printf("transferData: open() failed!\n");
return;
}
else
printf("transferData: open() succeeded\n");
err = (*intf)->CreateInterfaceAsyncEventSource(intf, &cfSource);
if (err)
{
printf("transferData: unable to create event source, err = %08x\n",
err);
return;
}
else
printf("transferData: created event source\n");
CFRunLoopAddSource(CFRunLoopGetCurrent(), cfSource,
kCFRunLoopDefaultMode);
err = (*intf)->GetBusFrameNumber(intf, &frame, &atTime);
if(err)
{
printf("transferData: GetBusFrameNumber failed err = %08x\n", err);
CFRunLoopRemoveSource(CFRunLoopGetCurrent(), cfSource,
kCFRunLoopDefaultMode);
return;
}
else
printf("transferData: got frame number\n");
frame = frame + 10;
for(i = 0; i < MAX_READ_FRAME; i++)
{
frameList[i].frStatus = 2;
frameList[i].frReqCount = REQ_COUNT; //Transfer per frame, optimal
should be 5x256
}
startTime = CFAbsoluteTimeGetCurrent();
printf("transferData: BEGIN %lf\n", startTime);
err = (*intf)->ReadIsochPipeAsync(intf, inPipeRef, inBuf, frame,
(UInt32) MAX_READ_FRAME, frameList,
(IOAsyncCallback1)MyCallBackFunction, (void*)(UInt32)inPipeRef);
if (err)
{
printf("transferData: ReadPipeAsyncFailed, err = %08x\n", err);
CFRunLoopRemoveSource(CFRunLoopGetCurrent(), cfSource,
kCFRunLoopDefaultMode);
return;
}
printf("transferData: calling CFRunLoopRun\n");
CFRunLoopRun();
printf("transferData: returned from CFRunLoopRun\n");
CFRunLoopRemoveSource(CFRunLoopGetCurrent(), cfSource,
kCFRunLoopDefaultMode);
for(i = 0; i < MAX_READ_FRAME; i++)
actCount = actCount + frameList[i].frActCount;
write(file, inBuf, actCount);
intervalTime = endTime - startTime;
printf("transferData: %d bytes read in %lf sec = %lf bytes/sec\n",
actCount, intervalTime, (double) (actCount/intervalTime));
printf("%d %d %d %d %d %d\n", inBuf[0], inBuf[1], inBuf[2],
inBuf[3], inBuf[4], inBuf[5]);
free(inBuf);
}
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