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@23n27.bsky.social

break apart to build anew • unrepentant eureka moment junkie • aspiring abstraction-leak plugger and black box elucidator https://n621.de / The other network: https://dgc.social/@23n27

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@23n27.bsky.social · 6mo ago

Maybe I should try projectposting on here? Anyway, this seems to be working, so I guess I need to do the fully integrated version with a GPS module now.

Two PCBs connected with a flat flex cable. The left one has a USB-C cable plugged in, the right one an Ethernet cable. The left one is a breakout for the AX88772C USB->RMII chip. The right one is a breakout for the DP83640 PTP Ethernet PHY. It has a bunch of GPIOs broken out to pin headers and has two SMA jacks (one for PPS input, one for the frequency generator output of the PHY). A bunch of cables are soldered to the EEPROM and (invisibly) the MDIO test points on the AX88772C board and go off to the top of the picture into a basic FX2 logic analyzer.Screenshot of dmesg: usb 3-12.4.3: new high-speed USB device number 66 using xhci_hcd usb 3-12.4.3: New USB device found, idVendor=0b95, idProduct=772b, bcdDevice= 0.02 usb 3-12.4.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 3-12.4.3: Product: grandmaster-on-a-stick usb 3-12.4.3: Manufacturer: isentropic.systems usb 3-12.4.3: SerialNumber: 000000 PTP clock support registered asix 3-12.4.3:1.0 (unnamed net_device) (uninitialized): PHY [usb-003:066:01] driver [TI DP83620 10/100 Mbps PHY] (irq=POLL) TI DP83620 10/100 Mbps PHY usb-003:066:01: attached PHY driver (mii_bus:phy_addr=usb-003:066:01, irq=POLL) asix 3-12.4.3:1.0 eth1: register 'asix' at usb-0000:80:14.0-12.4.3, ASIX AX88772B USB 2.0 Ethernet, 00:00:10:00:1d:02