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Update i2c_firmware/README.md

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Scott Leonard
2025-11-29 19:11:34 +00:00
parent a2df5f02fb
commit 3a29128e59
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i2c_firmware/README.md
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@@ -1,6 +1,6 @@
# OpenWRT 24.10.4 Firmware with GPIO I²C for GL.iNet XE300 # OpenWRT 24.10.4 Firmware with GPIO I²C for GL.iNet XE300
Custom OpenWRT build enabling **GPIO-based I²C master** on the GL.iNet XE300 (QCA9531) using `i2c-gpio` driver and clean DTS integration. Custom OpenWRT build enabling **GPIO-based I²C master** on the XE300 using `i2c-gpio` driver and clean DTS integration.
## Locate & Edit DTS ## Locate & Edit DTS
@@ -30,6 +30,12 @@ i2cdetect -y 0
cat /sys/kernel/debug/gpio cat /sys/kernel/debug/gpio
i2cdump -y 0 0x48 # Adjust address accordingly i2cdump -y 0 0x48 # Adjust address accordingly
## Notes
- ✅ If you connect the resistors after boot, bus works great (ADS1115 detected at 0x48).
- ✅ Reboots are fine — problem only occurs on cold boot / full power cycle.
- ✅ The ADS1115 can be powered before boot or after — no issue.
- ❌ The presence of 3.3V on SDA/SCL at boot causes the SoC to hang.
Ubuntu 22.04+ build tools: Ubuntu 22.04+ build tools: