Hello Greg and others, I am developing a USB Host controller on NuttX with hardware which is not compliant with OHCI or EHCI. As the hardware provides setup of hardware registers for the USB Host, I am trying to "fit" it to OHCI spec (currently using lpc17_40_usbhost as reference). I am confused about the usage of following buffers and how to use them in read/ write from hardware during interrupt (in bottom half). During initialization, EDuffer, TDBuffer, TBBuffer and xferInfo buffers are created. I am using chunk of memory for each of these and allocated 10 buffers for each (hardware has 10 endpoints) for ED, TD, TB and xferInfo. I assume ED for Endpoint, TD for Transfer Descriptor, TB for TransferBuffer and xferInfo is to manage the transfer details between interrupts. With this setup and initial configuration, I am able to detect attaching of device and then issue first setup packet. Device sends the data and interrupt is triggered. I ack this interrupt and start the bottom half (worker queue) to read the data (I have the data in the hardware registers) and in bottom half, I am not sure, where should I read this data into - ED/ TD/ TB? Also I am not sure, how to get the reference to these buffers in bottom half? Some pointers/ direction would help me a lot. Thanks in advance and with best regards, Phani.
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