How to determine that the read operation has been completed

[shengwenLiang]

Hi,
Recently, I add a command to firmware, the command aims to read data from NAND flash to the specified address of dram. and now I find when I send this command to OpenSSD, but I can't determine that the read operation has been completed. I only compute this time by using the throughout of NAND flash channel(171MB/s), but from my test, I find this method not always work.
So, could you tell me how to determine that read operation has been completed?
Thanks.

[KibinPark]

You can poll a status of the NAND way via ReadStatus command or the completion via reading a completion field given with ReadPageTransfer command.

ref:
V2FReadPageTransferAsync(V2FMCRegisters* dev, int way, void* pageDataBuffer, void* spareDataBuffer, unsigned int* errorInformation, unsigned int* completion, unsigned int rowAddress);

Check whether (*completion & 1) is 1.

[shengwenLiang]

You can poll a status of the NAND way via ReadStatus command or the completion via reading a completion field given with ReadPageTransfer command.

ref:
V2FReadPageTransferAsync(V2FMCRegisters* dev, int way, void* pageDataBuffer, void* spareDataBuffer, unsigned int* errorInformation, unsigned int* completion, unsigned int rowAddress);

Check whether (*completion & 1) is 1.

Thanks for your reply, and now, in my project, I take this method. when I push the V2FCommand_ReadPageTrigger command to ReqQueue, than I execute the EmptyReqQ() function.

handle_nvme_vendor_process(nvmeCmd->cmdSlotTag, nvmeIOCmd);
EmptyReqQ();
The first line similar to read operation process.

I wonder if there is any problem that I take this method.

Thanks

[KibinPark]

I think there is no problem at all.