This is the Weekly Report page for the Replace GBridge Project.
Hello everyone. I just wanted to provide a brief project description along with Week 0 Progress update.
Project Goals
- Introduce a Platform Driver that facilitates communication between AM6254 and CC1352 in BeaglePlay over UART.
- Move SVC and APBridge roles from GBridge into CC1352 firmware.
- Eliminate GBridge and other components that are no longer necessary.
- Add a tutorial to the documentation to use the new setup.
Week 0
Accomplishments
- Install Debian on BeaglePlay.
- Explore BeaglePlay with ssh and hosted vscode.
- Boot a custom Kernel on BeaglePlay.
- Interact with BeagleConnect Freedom using
tio - Interact with BeagleConnect Freedom sensors using micropython.
- Write Introductory Blog Post
- Post Introductory Video
- Write a Hello World Kernel Module for BeaglePlay.
Upcoming Targets
- Study the basics of the device tree.
- Flash BeagleConnect Freedom with bcf greybus node firmware.
- Implement serial device initialization.
- Write a CI to check that the module compiles.
3 Likes
Week 1
Accomplishments
- Write a serdev driver that uses AM62 to CC1352 serial port.
- Apply a device tree overlay to BeaglePlay.
- Write “HelloWorld” from Linux to CC1352.
- Recieve “HelloWorld” from CC1352 to Linux. (Currently just used
samples/drivers/uart/echo_bot) - Flash hello world zephyr to BeaglePlay CC1352.
- Write a blog post to setup BeaglePlay.
- Opened issue regarding broken cc2538 script.
Upcoming Targets
- Write a CI to check that the module compiles.
- Copy UART handling code to Zephyr Application.
- Have an actual format for UART communication. Currently just writing arbitrary binary from both sides.
1 Like
Week 2
Accomplishments
- Set up Zephyr Logging to UART.
- Move repositories to git.beagleboard.org/gsoc/greybus.
- Mirror Repositories to Github (cc1352-firmware, beagleplay-greybus-driver)
- Flash BeagleConnect Freedom with bcf greybus node firmware.
- Write a blog post to setup Zephyr application development.
Potential Blockers
- Zephyr DNS resolver might not support mDNS discovery.
Upcoming Targets
- Run some more Zephyr Greybus examples.
- Setup Zephyr application logging into Linux Driver.
- Use static address to connect to node for now.
Week 3
Accomplishments
- Build and flash greybus-for-zephyr for beagleconnect freedom
- Open PRs to make greybus-for-zephyr run will latest zephyr: Add dynamic pthread support (!8) · Merge requests · BeagleConnect / Zephyr / Zephyr · GitLab
- Open PR to move beagle-connect freedom networking to board config: Add IEEE802154 config for beagleconnectfreedom (!9) · Merge requests · BeagleConnect / Zephyr / Zephyr · GitLab
- Write a new blog post about Linux Serial Device Bus.
- Added skeleton for SVC role to Zephyr application.
Upcoming Targets
- Open socket connection to Greybus Node.
- Get greybus manifest from the node.
Week 4
Accomplishments
- Establish socket connection with Cport 0 of greybus node.
- Build a reliable way to keep track of all nodes and their respective cports.
- Implement asynchronous processing of greybus operations (messages to send and responses to receive).
- Switch to using static threads.
- Send Greybus control requests from BeaglePlay CC1352 (ping, svc protocol version request and get manifest size request).
- Receive a response from greybus node (for all of the above).
- Use a unique id for each greybus operation.
Upcoming Targets
- Get manifest from the Greybus node.
- Establish connection with other cports of bcf node.
- Implement more control operations.
Potential Blockers
- Zephyr DNS resolver might not support mDNS discovery.
Week 5
Accomplishments
- Parse Greybus manifest.
- Connect to all CPorts after using data from Manifest
- Refactor Code. Made things more thread-safe.
- Switch to using Workqueue where it makes more sense.
- Write a new blog post about concurrency primitives in Zephyr.
Upcoming Targets
- HDLC over UART communication with Linux Driver.
- Try using MCUmgr over HDLC for Zephyr application management.
Potential Blockers
- Zephyr DNS resolver might not support mDNS discovery.
- No userspace tool for checking hdlc implementation from userspace.
Week 6
Accomplishments
- HDLC over UART working.
- Logging over HDLC is also working (even faults).
- Expose MCUmgr tty.
- Initial MCUmgr support. Echo and Reset work.
- Initial greybus communication between AP and SVC.
Upcoming Targets
- Complete SVC-AP interactions
- Complete connection nodes with AP.
Potential Blockers
- Zephyr DNS resolver might not support mDNS discovery.
- MCUboot on beagleplay cc1352 is quite complicated.
1 Like
Week 7
Accomplishments
- Most of the SVC interactions working
- APBridge is also working.
- Connections with all Cports working.
- BCF Node sensors show up on Linux hosts as devices.
- MCUmgr tty taskstat working
Upcoming Targets
- Fix bug that causes greybus to start failing after a few minutes
- Cleanup Linux driver for upstreaming
- Optimize Beagleplay CC1352 application
Potential Blockers
- Zephyr DNS resolver might not support mDNS discovery.
- MCUboot on Beagleplay cc1352 is quite complicated.
Week 8
Accomplishments
- Fix HDLC bug in Linux driver
- Refactor Linux Driver
- Fix destroy connection in SVC.
- Optimize APBridge
Upcoming Targets
- Make MCUmgr support configurable
- Cleanup Linux driver for Upstreaming
- Create a demo with the new Architecture
Potential Blockers
- Zephyr DNS resolver might not support mDNS discovery.
- MCUboot on Beagleplay cc1352 is quite complicated.
Week 9
Accomplishments
- Make MCUmgr support configurable in zephyr application
- Format Zephyr application according to checkpatch
- Format Linux driver according to checkpatch
- Create a demo.
- Initial implementation for dns-sd based discovery of bcf nodes
- Setup things for sending patch to linux kernel mailing list
Upcoming Targets
- Move dns-sd based discovery to main zephyr application.
- Improve Linux driver for upstreaming.
Potential Blockers
- MCUboot on Beagleplay cc1352 is quite complicated.
- Leaving node idle seems to cause disconnection.
Week 10
Accomplishments
- Implement dns-sd based greybus node discovery.
- Fix resume after suspend for greybus node.
Upcoming Targets
- Try using the Linux HDLC module in the driver.
- Allow sending/receiving general networking packets to the 6LoWPAN network.
Potential Blockers
- MCUboot on Beagleplay cc1352 is quite complicated.
Week 11
Accomplishments
- Polish Zephyr application and fix bugs.
- Allow starting and stopping SVC and APBridge without resetting CC1352.
- Fix bug that caused system to hang on removing Linux driver.
- Make Linux Driver gracefully start and stop SVC.
Upcoming Targets
- Make HDLC implementation more suitable for upstreaming.
- Refactor Zephyr application operations code.
- Allow sending/receiving general networking packets to the 6LoWPAN network.
Potential Blockers
- MCUboot on Beagleplay cc1352 is quite complicated.
2 Likes
Week 12
Accomplishments
- Move away from System Heap. Allows finer control over heap memory requirements.
- Fix some memory leaks.
- Remove Module removal from the discovery code. This was causing reliability problems since sometimes nodes do not respond when under load. Now can easily withstand > 5 mins of continuous sensor reading with < 50ms latency for each read.
- Extract node discovery to separate thread with lower priority.
- Optimize node discovery. Now using binary search to search current nodes.
- Some performance testing. Was able to get a latency of around 45ms when reading the temp sensor value. (tested with around 10k requests)
Upcoming Targets
- Make HDLC implementation more suitable for upstreaming.
- Allow sending/receiving general networking packets to the 6LoWPAN network.
- Create a conclusion video and blog post.
Potential Blockers
- Finding alternate to MCUboot for flashing without restart.
2 Likes