I have an Atmel AT89C5132 that has some USB mass storage firmware. It uses the Windows USBstor.sys Mass Storage Class driver. I need to be able to keep that in place an still be able to send data from a desktop application to the chip that will get passed on to another processor. I need help understanding where I can safely modify the firmware, knowing what to look for (CBW or CSW etc), and overall can this be done. Any help would be greatly appreciated.
Sean
Not sure, but in our Netchip USB world it would be another "End Point". Then that channel is separate. I don't know if it needs a whole new driver on the Host side or not.
Ken
CBW and CSW are a part of the "transparent transport" mechanism used by USB mass storage devices to encapsulate SCSI commands.
Whether or not the Winblows USBstor.sys driver gives you access to this layer is unknown to me. However, since it is a generic USB mass storage driver, and you would be adding extensions, I would think this would be difficult hack.
If your device identifies itself as a Mass Storage device, then the OS is going to attempt to use you as such. Otherwise, I don't know how the USBstor.sys driver will get involved.
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Thanks! That confirms for me that CBW's are only a part of mass storage. I was able to find another driver that the chip is using for downloading new firmware. So far, I have successfully got a device handle but am now trying to get all the endpoint information. I'm looking for source code using the SetupApi.dll calls. Any help here would be appreciated.
Sean
no need to modify the firmware, just define a special permanent file on the storage device - writing to that file will end up as passing data to your another processor.
Pozdrawiam.
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