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Hi,
I am developing a usb driver based on IOSerialStreamSync and IOSerilaDriverSync. Where normal serial application can access my driver and communicate with the device.
Normally read and wite is working fine when sending and receiving data less than 1k. If more than 1k the behaviour is different.
If Iam sending 2000 bytes using write
As we expect the driver gets the call to enqueueData with request size of 2000bytes at once, but its not. It gets called two times with 1024 once and remaining with second call. So to avoid this chunking, I have created private
IOCTL to send data from application to the driver with wanted bytes to transfer on usb pipe. This solved my write issue.
In read when the data is recieved the dataReadComplete is called with 2000bytes. fine. But in dequeData the request data is again chunking, as the result the read is called two times for 2000bytes. Iam unable to read more than
1024 from the driver at once . By maing some changes in dequequeData tried to send more data from the driver but failed, system crashes.
Is there any settings from user level to increase the read buffer size...
Please help me.. if you have not understood my question please let me update.
Thanks & Regards
Sachin.
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