mikkeli
4742d4a5bb
The L4T kernel ships without qmi_wwan/cdc-wdm, and PPP dial-up made KDDI detach the povo SIM (attach APN was au's; PPP re-activating the default bearer still detached). Built both modules out of tree from v5.15.148 into ~/infra/qmi_wwan, set the attach APN to povo.jp, and added an NM connection at metric 1000 so LTE ranks below Ethernet and WiFi. GNSS autostarts on the modem and gpsd reads /dev/sim7600-gps (udev symlink on interface 01); no fix yet, tested indoors. BOM: NMEA is on ttyUSB1 not ttyUSB3, and the data path is QMI, not RNDIS/PPP. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
56 lines
2.5 KiB
Markdown
56 lines
2.5 KiB
Markdown
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type: reference
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---
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# Bill of Materials
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## PEAK-System PCAN-USB
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| Field | Value |
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|-------|-------|
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| **Manufacturer** | PEAK-System Technik GmbH |
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| **Model** | PCAN-USB |
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| **USB ID** | `0c72:000c` |
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| **Purpose** | USB-to-CAN adapter for reading car CAN bus traffic |
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| **Interface** | SocketCAN netdev |
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| **Default bitrate** | 500 kbps |
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| **Driver** | PEAK proprietary driver 9.2.0 (netdev build) — out-of-tree module, must be rebuilt after kernel updates |
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### Notes
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- The mainline kernel driver `peak_usb` is not compiled into the NVIDIA Tegra kernel (JetPack r36.4), so PEAK's proprietary driver is required.
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- Must be built with `NET=NETDEV_SUPPORT` for standard SocketCAN tools (`candump`, `ip link`, etc.).
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- The module lives at `/lib/modules/$(uname -r)/misc/pcan.ko` and is loaded via `modprobe pcan`.
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- Jetson Orin Nano has built-in `can0` (exposed by GPIO pins), so any extra CAN interface should enumerate from `can1`; but this is only heuristic and should not be trusted.
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## Waveshare SIM7600G-H-M.2
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[hat](https://www.waveshare.com/wiki/SIM7600G-H-M2_4G_HAT) [module](https://www.waveshare.com/wiki/SIM7600G-H-M.2)
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| Field | Value |
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|-------|-------|
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| **Manufacturer** | Waveshare (SIMCom SIM7600G-H-M.2 module) |
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| **Form factor** | M.2 B KEY |
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| **Purpose** | LTE Cat 4 cellular + multi-constellation GNSS (GPS, Beidou, GLONASS, GALILEO, QZSS) |
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| **Interface** | USB (ttyUSB* for AT commands/NMEA, QMI `cdc-wdm0` + `wwan0` for data) |
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| **Power** | 3V – 4.2V (board rail) |
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| **Antennas** | 3× IPEX (LTE main + LTE diversity + GNSS) |
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| **Max data rate** | 150 Mbps DL / 50 Mbps UL (LTE Cat 4) |
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### Required software
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| Package | Purpose |
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|---------|---------|
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| `gpsd` | Decode NMEA from the GNSS ttyUSB port |
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| `ModemManager` + `NetworkManager` | Manage the modem and the LTE data connection (QMI) |
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| `qmi_wwan` + `cdc-wdm` kernel modules | Not in the Tegra kernel; built out of tree in `~/infra/qmi_wwan/` |
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| `minicom` (or `picocom`) | AT command terminal for module configuration |
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### Notes
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- The module presents multiple USB serial ports (`/dev/ttyUSB0`–`/dev/ttyUSB4`) — ttyUSB2/3 for AT commands, ttyUSB1 for NMEA GPS data (symlinked as `/dev/sim7600-gps`).
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- Default USB composition (PID 9001) is used with QMI; no PID switch needed. PPP dial-up does not work with the povo SIM (network detaches).
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- Setup details: [SIM7600 setup report](impl/reports/SIM7600-SETUP.md).
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- M.2 B KEY is **not** mechanically compatible with Mini-PCIe.
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- Supply voltage should be ~4.0 V for reliable operation.
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- DO NOT hot-plug while powered.
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