Implementing a Custom USB Device Controller Driver in Zephyr
summary
Custom Xilinx USB device controller on an Enclustra FPGA is integrated with Zephyr attempting to use the Zephyr USB stack but initial debugging shows enumeration fails until controller registers are configured. Tools used include logic analyzer and USB traffic capture and peeking registers via the ARM hard core. The pragmatic move is that tiny USB is ported tiny USB into Zephyr so the CDC echo works and a CDC echo works over Windows COM port, but full native Zephyr stack integration remains to be implemented.
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chapters (20)
- 0:00Intro
- 0:20THE SPEAKER
- 2:12Agenda
- 3:20System Architecturé
- 6:57USB CDC in FreeRTOS
- 7:42TinyUSB
- 10:18Existing System
- 11:06Problem Statement
- 12:10Device Connection
- 13:02USB Transaction
- 14:44USB Packet
- 17:18USB Endpoints
- 18:17Zero Length Packets
- 20:46USB Enumeration
- 21:25Initial Strategy
- 22:29Troubleshooting
- 24:24Initial Results
- 25:12Resolution
- 26:59Retrospective
- 28:25Next Steps
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