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I have 3 devices connected, when i click a button, a vendor command via control transfer will sent to each device.
You will see for the first 3 transfer, they are all success. But will i click another button which also another vendor command via control transfer to all device, it cancel out! Then when i click again (click third time), it said "unsuccessful transaction".
This is the code in firmware, i put this in "CyBool_t CyFxLEDtestApplnUSBSetupCB" USB setup CB.